Journal articles: 'Visible and near-infrared range'

1

Balashov, A. A., V. A. Vaguine, I. S. Golyak, A. N. Morozov, I. N. Nesteruk, and A. I. Khorokhorin. "Fourier Spectrometer of Visible and Near Infrared Range." Radio Engineering, no. 6 (January 1, 2017): 27–38. http://dx.doi.org/10.24108/rdeng.0617.0000124.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Calmano, Thomas, and Sebastian Muller. "Crystalline Waveguide Lasers in the Visible and Near-Infrared Spectral Range." IEEE Journal of Selected Topics in Quantum Electronics 21, no. 1 (January 2015): 401–13. http://dx.doi.org/10.1109/jstqe.2014.2350022.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Uchida, Masao, Yutaka Ohmori, and Katsumi Yoshino. "Electroluminescence from Visible to Near-Infrared Spectral Range in Buckminsterfullerene Diode." Japanese Journal of Applied Physics 30, Part 2, No. 12B (December 15, 1991): L2104—L2106. http://dx.doi.org/10.1143/jjap.30.l2104.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Acerbi, Fabio, Giovanni Paternoster, Massimo Capasso, Marco Marcante, Alberto Mazzi, Veronica Regazzoni, Nicola Zorzi, and Alberto Gola. "Silicon Photomultipliers: Technology Optimizations for Ultraviolet, Visible and Near-Infrared Range." Instruments 3, no. 1 (February 12, 2019): 15. http://dx.doi.org/10.3390/instruments3010015.

Full text

Abstract:

Silicon photomultipliers (SiPMs) are single-photon sensitive solid-state detectors that are becoming popular for several applications, thanks to massive performance improvements over the last years. Starting as a replacement for the photomultiplier tube (PMT), they are now used in medical applications, big high-energy physics experiments, nuclear physics experiments, spectroscopy, biology and light detection and ranging (LIDAR) applications. Due to different requirements in terms of detection efficiency, noise, etc., several optimizations have been introduced by the manufacturers; for example, spectral sensitivity has been optimized for visible light, near ultraviolet, vacuum ultraviolet, and near infrared light. Each one of them require specific processes and structural optimization. We present in this paper recent improvements in SiPM performance, owing to a higher cell fill-factor, lower noise, improved silicon materials, and deep trench isolation. We describe issues related to the characterization of analog SiPM, particularly due to the different sources of correlated noise, which have to be distinguished from each other and from the primary pulses. We also describe particular analyses and optimizations conducted for specific applications like the readout of liquid noble gas scintillators, requiring these detectors to operate at cryogenic temperatures.

APA, Harvard, Vancouver, ISO, and other styles

5

Tkachenko, Volodymyr, Giancarlo Abbate, Antigone Marino, Francesco Vita, Michele Giocondo, Alfredo Mazzulla, Federica Ciuchi, and Luca De Stefano. "Nematic Liquid Crystal Optical Dispersion in the Visible-Near Infrared Range." Molecular Crystals and Liquid Crystals 454, no. 1 (September 2006): 263/[665]—271/[673]. http://dx.doi.org/10.1080/15421400600655816.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Wolf, Ursula, Sabine Klein, Annegret Sandig, and Stephan Baumgartner. "Investigating homeopathic preparations with light spectroscopy." International Journal of High Dilution Research - ISSN 1982-6206 11, no. 40 (December 21, 2021): 117. http://dx.doi.org/10.51910/ijhdr.v11i40.584.

Full text

Abstract:

Background Several series of experiments from our research group have shown ultraviolet (UV) light transmission of homeopathic preparations to slightly but significantly differ from controls. We now investigated whether visible and near infrared spectroscopy were also useful for exploring properties of homeopathic preparations. Materials and methods Homeopathic preparations of copper sulfate (CuSO4), hypericum and sulfur (S8) were produced in 30 sequential steps of 1:100 dilutions (c-preparations). As controls, succussed potentization medium was used. Transmission of the samples from 190-1100nm was measured 4 times on 5 days with a double beam Shimadzu UV PC 1601 spectrophotometer. To correct for the daily variations of the spectrophotometer, transmission of the samples at each nm was divided by the average transmission of the controls. Median transmissions of the samples were calculated for the ranges of 190-340nm (near and middle UV), 340-640nm (visible light without red), and 640-1100nm (red and near infrared). Differences in the median transmission between potency levels from 6c to 30c were determined using Kruskal-Wallis and Jonckheere-Terpstra tests. Results Differences in transmissions of the various potency levels were more pronounced in the UV range than in the visible or red/near infrared range. The Kruskal-Wallis test revealed significant differences for homeopathic preparations of CuSO4, hypericum and S8 in the UV range (p=0.032, 0.008, 0.009, respectively) and of S8 in the visible range (p=0.026). Jonckheere's test showed a tendency towards ascending medians with ascending potency levels for CuSO4 in the UV range (p=0.080). Significant trends were revealed for hypericum in the visible range (p=0.042, descending medians) and S8 in the UV range (p=0.015, ascending medians). Conclusion UV spectroscopy seemed to be more suitable for investigating homeopathic preparations than visible or near infrared spectroscopy, since differences in transmission were more pronounced in the UV range.

APA, Harvard, Vancouver, ISO, and other styles

7

Agresti, Giorgia, Giuseppe Bonifazi, Luca Calienno, Giuseppe Capobianco, Angela Lo Monaco, Claudia Pelosi, Rodolfo Picchio, and Silvia Serranti. "Surface Investigation of Photo-Degraded Wood by Colour Monitoring, Infrared Spectroscopy, and Hyperspectral Imaging." Journal of Spectroscopy 2013 (2013): 1–13. http://dx.doi.org/10.1155/2013/380536.

Full text

Abstract:

The aim of this investigation is to study the changes occurring on the surface of poplar wood exposed to artificial irradiation in a Solar Box. Colour changes were monitored with a reflectance spectrophotometer. Surface chemical modifications were evaluated by measuring the infrared spectra. Hyperspectral imaging was also applied to study the surface wood changes in the visible-near infrared and the short wave infrared wavelength ranges. The data obtained from the different techniques were compared to find the possible correlations in order to evaluate the applicability of the Hyperspectral imaging to investigate wood modifications in a non-invasive modality. The study of colour changes showed an important variation due to photo-irradiation which is the greatest change occurring within the first 24 hours. Infrared spectroscopy revealed that lignin degrades mainly in the first 48 hours. Concerning Hyperspectral imaging, the spectral features in the visible-near infrared range are mainly linked to the spectral shape, whereas in the short wave infrared cellulose and lignin affect shape and reflectance levels. The proposed approach showed that a correlation can be established between colour variation and wood degradation in the visible-near infrared range; furthermore in the short wave infrared region surface chemical changes can be assessed.

APA, Harvard, Vancouver, ISO, and other styles

8

Li, Yun, and Haiqing Yang. "Honey Discrimination Using Visible and Near-Infrared Spectroscopy." ISRN Spectroscopy 2012 (November 5, 2012): 1–4. http://dx.doi.org/10.5402/2012/487040.

Full text

Abstract:

This study aims to investigate the potential of honey discrimination by visible and near-infrared (vis-NIR) spectroscopy with wavelength reduction. A total of 80 samples from four brands of honey produces were measured by a mobile fiber-type USB4000 spectrophotometer with recorded wavelength range of 380.17~939.98 nm for model calibration. Firstly, principal components analysis (PCA) was used for extracting principal components (PCs). Next, the first seven PCs, which accounted for 97% of variance of the spectra, were combined separately with support vector machine (SVM) and linear discriminate analysis (LDA) to develop PC-SVM and PC-LDA models, both of which achieved 100% discrimination accuracy. In addition, the spectra were subjected to successive wavelength reduction rates (WRRs) of 2x, x = 1–9, for wavelength reduction. The PC-LDA and PC-SVM models developed for these reduced wavelengths produced almost the same performance as compared with those developed for original full wavelengths. This experiment suggests that vis-NIR spectral wavelengths can be reduced at large spacing interval, which allows easing data analysis as well as developing a simpler and cheaper sensor for honey discrimination in practice.

APA, Harvard, Vancouver, ISO, and other styles

9

Downare, Taggart D., and Oliver C. Mullins. "Visible and Near-Infrared Fluorescence of Crude Oils." Applied Spectroscopy 49, no. 6 (June 1995): 754–64. http://dx.doi.org/10.1366/0003702953964462.

Full text

Abstract:

Fluorescence emission spectra and absolute quantum yields have been measured for ten diverse crude oils at various concentrations over a broad range of excitation and emission wavelengths in the visible and the near-infrared. Energy transfer produces large red shifts and large widths in the fluorescence emission spectra for shorter wavelength excitation particularly for heavier crude oils. However, the effects of energy transfer are nearly absent for near-infrared excitation; all crude oils exhibit nearly the same emission spectra for long wavelength excitation. In addition, the fraction of emission resulting from collisional energy transfer relative to nascent emission is almost independent of oil type; it is governed by quantum yield characteristics. Absolute fluorescence quantum yields of ten crude oils (and three rhodamine dyes for validation) were measured with respect to scattering of latex microspheres in distilled water. Fluorescence quantum yields vary systematically with crude oil type as well as excitation wavelength; quantum yields are lower for high fluorophore concentrations (heavy crude oils) and for longer wavelength excitation. Stern-Volmer analyses of the quantum yields indicate that simple models apply and show the relative quenching rates for different excitation wavelengths.

APA, Harvard, Vancouver, ISO, and other styles

10

Huang, Sheng-Ting, Chien-Chih Lai, Fang-Wen Sheu, and Wan-Shao Tsai. "Characterization of long-range plasmonic waveguides at visible to near-infrared regime." AIP Advances 7, no. 12 (December 2017): 125221. http://dx.doi.org/10.1063/1.5011716.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Poborchii, Vladimir V., Tetsuya Tada, and Toshihiko Kanayama. "A visible–near infrared range photonic crystal made up of Si nanopillars." Applied Physics Letters 75, no. 21 (November 22, 1999): 3276–78. http://dx.doi.org/10.1063/1.125323.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Meinke, M., I. Gersonde, M. Friebel, J. Helfmann, and G. Müller. "Chemometric Determination of Blood Parameters Using Visible—Near-Infrared Spectra." Applied Spectroscopy 59, no. 6 (June 2005): 826–35. http://dx.doi.org/10.1366/0003702054280603.

Full text

Abstract:

Visible and near-infrared (NIR) integrating sphere spectroscopy and chemometric multivariate linear regression were applied to determine hematocrit (HCT) and oxygen saturation (SatO2) of circulating human blood. Diffuse transmission, total transmission, and diffuse reflectance were measured and the partial least squares method (PLS) was used for calibration considering different wavelength ranges and selected optical measurement parameters. HCT and SatO2 were changed independently. Each parameter was adjusted to different levels and four designs with blood from different donors were carried out for the calibration with PLS. The calibration included the changes in hemolysis as well as inter-individual differences in cell dimensions and hemoglobin content. At a sample thickness of 0.1 mm the HCT and SatO2 were predicted with a root mean square error (PRMSE) of 1.4% and 2.5%, respectively, using transmission and reflectance spectra and the full Vis-NIR range. Using only diffuse NIR reflectance spectroscopy and a sample thickness of 1 mm, HCT and SatO2 could be predicted with a PRMSE of 1.9% and 2.8%, respectively. Prediction of hemolysis was also possible for one blood sample with a PRMSE of 0.8% and keeping HCT and SatO2 stable with a PRMSE of 0.03%.

APA, Harvard, Vancouver, ISO, and other styles

13

Son, Dong-Min, Hyuk-Ju Kwon, and Sung-Hak Lee. "Visible and Near Infrared Image Fusion Using Base Tone Compression and Detail Transform Fusion." Chemosensors 10, no. 4 (March 25, 2022): 124. http://dx.doi.org/10.3390/chemosensors10040124.

Full text

Abstract:

This study aims to develop a spatial dual-sensor module for acquiring visible and near-infrared images in the same space without time shifting and to synthesize the captured images. The proposed method synthesizes visible and near-infrared images using contourlet transform, principal component analysis, and iCAM06, while the blending method uses color information in a visible image and detailed information in an infrared image. The contourlet transform obtains detailed information and can decompose an image into directional images, making it better in obtaining detailed information than decomposition algorithms. The global tone information is enhanced by iCAM06, which is used for high-dynamic range imaging. The result of the blended images shows a clear appearance through both the compressed tone information of the visible image and the details of the infrared image.

APA, Harvard, Vancouver, ISO, and other styles

14

Lo, Jen-Iu, Hsiao-Chi Lu, Wei-Hsiu Hung, J. F. Ogilvie, and Bing-Ming Cheng. "Visible, near-infrared and mid-infrared spectra of solid O2 at 6–33 K." Monthly Notices of the Royal Astronomical Society 514, no. 2 (June 21, 2022): 2815–20. http://dx.doi.org/10.1093/mnras/stac1524.

Full text

Abstract:

ABSTRACT We report spectra in the visible and near-infrared wavelength range 350–1155 nm and in the mid-infrared range 500–5000 cm–1 (2–20 $\mu$m) of molecular oxygen at temperatures 6–33 K. In mid-infrared spectra, a sharp line at 1552.4 cm–1 was observed at a deposition temperature of 6 K. The intensity, profile and position of this feature depended sensitively upon the deposition temperature as a result of a connection with lattice imperfections; instead, a triplet feature at 1545.7, 1548.1 and 1549.6 cm–1 appeared at temperatures 9 and 12 K, but disappeared at 18, 24 and 30 K. Additional infrared lines of solid α-O2 were observed at 1591 and 1617 cm–1, which exhibited a reversible behaviour through the α–β phase transition temperature at 24 K. The transmissions of solid O2 showed nearly no change in wavenumber range 500–2000 cm–1 (5–20 $\mu$m) at temperatures 6–33 K; above 2000 cm–1 (<5 $\mu$m), the transmission of solid O2 depended strongly on temperature. Roughly, the transmission of solid O2 at temperatures 6–21 K fluctuated slightly in the visible and near-infrared region, whereas it decreased greatly at 24 K and continuously diminished further at higher temperatures. Notably, a broad absorption of solid β-O2 was observed in the wavelength region 350–700 nm at temperatures 27, 30 and 33 K.

APA, Harvard, Vancouver, ISO, and other styles

15

Kruse, Fred A. "Integrated visible and near-infrared, shortwave infrared, and longwave infrared full-range hyperspectral data analysis for geologic mapping." Journal of Applied Remote Sensing 9, no. 1 (September 23, 2015): 096005. http://dx.doi.org/10.1117/1.jrs.9.096005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Fornasier, S., P. H. Hasselmann, J. D. P. Deshapriya, M. A. Barucci, B. E. Clark, A. Praet, V. E. Hamilton, et al. "Phase reddening on asteroid Bennu from visible and near-infrared spectroscopy." Astronomy & Astrophysics 644 (December 2020): A142. http://dx.doi.org/10.1051/0004-6361/202039552.

Full text

Abstract:

Context. The NASA mission OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) has been observing near-Earth asteroid (101955) Bennu in close proximity since December 2018. In October 2020, the spacecraft collected a sample of surface material from Bennu to return to Earth. Aims. In this work, we investigate spectral phase reddening – that is, the variation of spectral slope with phase angle – on Bennu using spectra acquired by the OSIRIS-REx Visible and InfraRed Spectrometer (OVIRS) covering a phase angle range of 8–130°. We investigate this process at the global scale and for some localized regions of interest (ROIs), including boulders, craters, and the designated sample collection sites of the OSIRIS-REx mission. Methods. Spectra were wavelength- and flux-calibrated, then corrected for the out-of-band contribution and thermal emission, resampled, and finally converted into radiance factor per standard OVIRS processing. Spectral slopes were computed in multiple wavelength ranges from spectra normalized at 0.55 μm. Results. Bennu has a globally negative spectra slope, which is typical of B-type asteroids. The spectral slope gently increases in a linear way up to a phase angle of 90°, where it approaches zero. The spectral phase reddening is monotonic and wavelength-dependent with highest values in the visible range. Its coefficient is 0.00044 μm−1 deg−1 in the 0.55–2.5 μm range. For observations of Bennu acquired at high phase angle (130°), phase reddening increases exponentially, and the spectral slope becomes positive. Similar behavior was reported in the literature for the carbonaceous chondrite Mukundpura in spectra acquired at extreme geometries. Some ROIs, including the sample collection site, Nightingale, have a steeper phase reddening coefficient than the global average, potentially indicating a surface covered by fine material with high micro-roughness. Conclusions. The gentle spectral phase reddening effect on Bennu is similar to that observed in ground-based measurements of other B-type asteroids, but much lower than that observed for other low-albedo bodies such as Ceres or comet 67P/Churyumov-Gerasimenko. Monotonic reddening may be associated with the presence of fine particles at micron scales and/or of particles with fractal structure that introduce micro- and sub-micro roughness across the surface of Bennu.

APA, Harvard, Vancouver, ISO, and other styles

17

Majerová, M., R. Klement, A. Prnová, J. Kraxner, E. Bruneel, and D. Galusek. "Crystallization and visible–near-infrared luminescence of Bi-doped gehlenite glass." Royal Society Open Science 5, no. 12 (December 2018): 181667. http://dx.doi.org/10.1098/rsos.181667.

Full text

Abstract:

Gehlenite glass microspheres, doped with a different concentration of Bi 3+ ions (0.5, 1, 3 mol%), were prepared by a combination of solid-state reaction followed by flame synthesis. The prepared glass microspheres were characterized from the point of view of surface morphology, phase composition, thermal and photoluminescence (PL) properties by optical and scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and PL spectroscopy. The closer inspection of glass microsphere surface by SEM confirmed a smooth surface. This was further verified by XRD. The basic thermal characteristics of prepared glasses, i.e. T g (glass transition temperature), T x (onset of crystallization peak temperature), T f (temperature of the inflection point of the crystallization peak) and T p (maximum of crystallization peak temperature), were estimated from the DSC records. High-temperature XRD experiments in the temperature interval range 600–1100°C were also performed. The PL emission properties of prepared glasses and their polycrystalline analogues (glass crystallized at 1000°C for 10 h) were studied in the visible and near-infrared (NIR) spectral range. When excited at 300 nm, the glasses, as well as their polycrystalline analogues, exhibit broad emission in the visible spectral range from 350 to 650 nm centred at about 410–450 nm, corresponding to Bi 3+ luminescence centres. The emission intensity of polycrystalline samples was found to be at least 30 times higher than the emission of their glass analogues. In addition, a weak emission band was observed around 775 nm under 300 nm excitation. This band was attributed to the presence of a minor amount of Bi 2+ species in prepared samples. In the NIR spectral range, the broad band emission was observed in the spectral range of 1200–1600 nm with the maxima at 1350 nm. The chemistry of Bi and its oxidation state equilibrium in glasses and polycrystalline matrices is discussed in detail.

APA, Harvard, Vancouver, ISO, and other styles

18

Qiang, Wei, Jin An Xia, Chun Rui Wang, and Xiao Yan Zhang. "Refractive Index Estimation of Nanoporous Silicon in Visible and Near-Infrared Spectrum Range." Advanced Materials Research 710 (June 2013): 8–12. http://dx.doi.org/10.4028/www.scientific.net/amr.710.8.

Full text

Abstract:

In this paper, we use Bruggeman model to calculate refractive index of nanoporous silicon, which was fabricated by electrochemical etching. The calculated result shows that the refractive index of the nanoporous silicon decreases linearly with increasing porosity and etching current density. In addition, the refractive index of nanoporous silicon was also measured by spectroscopic ellipsometry in the visible light spectrum range. The measured refractive index and extinction coefficient were in agreement with the calculated data, after being modified by the refractive index modified model of heavily doped silicon. In particular, we estimate the refractive index at the optical wavelengths in visible and near-infrared spectrum ranges, which may be widely used in various types of optical sensors and optoelectronic devices for optical communication systems.

APA, Harvard, Vancouver, ISO, and other styles

19

Gao, Huixuan, Wei Peng, Shuwen Chu, Wenli Cui, Zhi Liu, Li Yu, and Zhenguo Jing. "Refractory Ultra-Broadband Perfect Absorber from Visible to Near-Infrared." Nanomaterials 8, no. 12 (December 12, 2018): 1038. http://dx.doi.org/10.3390/nano8121038.

Full text

Abstract:

The spectral range of solar radiation observed on the earth is approximately 295 to 2500 nm. How to widen the absorption band of the plasmonic absorber in this range has become a hot issue in recent years. In this paper, we propose a highly applicable refractory perfect absorber with an elliptical titanium nanodisk array based on a silica–titanium–silica–titanium four-layer structure. Through theoretical design and numerical demonstration, the interaction of surface plasmon resonance with the Fabry–Perot cavity resonance results in high absorption characteristics. Our investigations illustrate that it can achieve ultra-broadband absorption above 90% from a visible 550-nm wavelength to a near-infrared 2200-nm wavelength continuously. In particular, a continuous 712-nm broadband perfect absorption of up to 99% is achieved from wavelengths from 1013 to 1725 nm. The air mass 1.5 solar simulation from a finite-difference time domain demonstrates that this absorber can provide an average absorption rate of 93.26% from wavelengths of 295 to 2500 nm, which can absorb solar radiation efficiently on the earth. Because of the high melting point of Ti material and the symmetrical structure of this device, this perfect absorber has excellent thermal stability, polarization independence, and large incident-angle insensitivity. Hence, it can be used for solar cells, thermal emitters, and infrared detection with further investigation.

APA, Harvard, Vancouver, ISO, and other styles

20

Downey, Gerard, Peter McIntyre, and Antony N. Davies. "Geographic Classification of Extra Virgin Olive Oils from the Eastern Mediterranean by Chemometric Analysis of Visible and Near-Infrared Spectroscopic Data." Applied Spectroscopy 57, no. 2 (February 2003): 158–63. http://dx.doi.org/10.1366/000370203321535060.

Full text

Abstract:

Visible and near-infrared reflectance spectra have been examined for their ability to classify extra virgin olive oils from the eastern Mediterranean on the basis of their geographic origin. Classification strategies investigated were partial least-squares regression, factorial discriminant analysis, and k-nearest neighbors analysis. Discriminant models were developed and evaluated using spectral data in the visible (400–750 nm), near-infrared (1100–2498 nm), and combined (400–2498 nm) wavelength ranges. A variety of data pretreatments was applied. Best results were obtained using factorial discriminant analysis on raw spectral data over the combined wavelength range; a correct classification rate of 93.9% was obtained on a prediction sample set. Though the overall sample set was limited in numbers, these results demonstrate the potential of near-infrared spectroscopy to classify extra virgin olive oils on the basis of their geographic origin.

APA, Harvard, Vancouver, ISO, and other styles

21

Aden, S. T., J. P. Bialas, Z. Champion, E. Levin, and J. L. McCarty. "Low cost infrared and near infrared sensors for UAVs." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-1 (November 7, 2014): 1–7. http://dx.doi.org/10.5194/isprsarchives-xl-1-1-2014.

Full text

Abstract:

Thermal remote sensing has a wide range of applications, though the extent of its use is inhibited by cost. Robotic and computer components are now widely available to consumers on a scale that makes thermal data a readily accessible resource. In this project, thermal imagery collected via a lightweight remote sensing Unmanned Aerial Vehicle (UAV) was used to create a surface temperature map for the purpose of providing wildland firefighting crews with a cost-effective and time-saving resource. The UAV system proved to be flexible, allowing for customized sensor packages to be designed that could include visible or infrared cameras, GPS, temperature sensors, and rangefinders, in addition to many data management options. Altogether, such a UAV system could be used to rapidly collect thermal and aerial data, with a geographic accuracy of less than one meter.

APA, Harvard, Vancouver, ISO, and other styles

22

Zhezhera, T., P. Gluchowski, M. Nowicki, M. Chrunik, A. Majchrowski, K. M. Kosyl, and D. Kasprowicz. "Efficient near-infrared quantum cutting by cooperative energy transfer in Bi3TeBO9:Nd3+ phosphors." Journal of Materials Science 57, no. 1 (January 2022): 185–203. http://dx.doi.org/10.1007/s10853-021-06642-2.

Full text

Abstract:

Abstract An efficient near-infrared quantum cutting process by cooperative down-conversion of active Bi3+ and Nd3+ ions was demonstrated in Bi3TeBO9:Nd3+ phosphors. In particular, the near-infrared emission of Nd3+ ions enhanced by Bi3+ ions of a series of novel Bi3TeBO9:Nd3+ microcrystalline powders doped with Nd3+ ions in various concentrations was investigated. In order to investigate the luminescent properties of BTBO:Nd3+ powders, the excitation and emission spectra and the fluorescence decay time were measured and analyzed. In particular, the emission of Bi3TeBO9:Nd3+ at 890 and 1064 nm was excited at 327 nm (via energy transfer from Bi3+ ions) and at 586.4 nm (directly by Nd3+ ions). The highest intensity emission bands in near-infrared were detected in the spectra of Bi3TeBO9:Nd3+ doped with 5.0 and 0.5 at.% of Nd3+ ions upon excitation in ultraviolet and visible spectral range, respectively. The fluorescence decay lifetime monitored at 1064 nm for Bi3TeBO9:Nd3+ powders shows the single- or double-exponential character depending on the concentrations of Nd3+ ions. The possible mechanisms of energy relaxation after excitation Bi3TeBO9:Nd3+ powders in ultraviolet or visible spectral range were discussed. The investigated Bi3TeBO9:Nd3+ phosphors efficiently concentrate the ultraviolet/visible radiation in the near-infrared spectral range and can be potentially used as effective spectral converters. Graphical abstract

APA, Harvard, Vancouver, ISO, and other styles

23

Silva, Evair Josino da, Erica Muniz de Miranda, Cláudia Cristina Brainer de Oliveira Mota, Avishek Das, and Anderson Stevens Leônidas Gomes. "Photoacoustic imaging of occlusal incipient caries in the visible and near-infrared range." Imaging Science in Dentistry 51, no. 2 (2021): 107. http://dx.doi.org/10.5624/isd.20200259.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Cierniewski, Jerzy, and Dominique Courault. "Bidirectional reflectance of bare soil surfaces in the visible and near‐infrared range." Remote Sensing Reviews 7, no. 3-4 (November 1993): 321–39. http://dx.doi.org/10.1080/02757259309532184.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Li, Jin, Yao Fu, Guoning Li, and Zilong Liu. "Remote Sensing Image Compression in Visible/Near-Infrared Range Using Heterogeneous Compressive Sensing." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 11, no. 12 (December 2018): 4932–38. http://dx.doi.org/10.1109/jstars.2018.2879363.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Vojna, David, Ryo Yasuhara, Ondrej Slezák, Jirí Mužík, Antonio Lucianetti, and Tomáš Mocek. "Verdet constant dispersion of CeF3 in the visible and near-infrared spectral range." Optical Engineering 56, no. 6 (June 9, 2017): 067105. http://dx.doi.org/10.1117/1.oe.56.6.067105.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Irrera, Fernanda, and Marco Valli. "Characterization of planar Ti:LiNbO3optical waveguides in the visible and near‐infrared spectral range." Journal of Applied Physics 64, no. 4 (August 15, 1988): 1704–8. http://dx.doi.org/10.1063/1.341764.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Coscia, Ubaldo, Giuseppina Ambrosone, Mariano Palomba, Simona Binetti, Alessia Le Donne, Dritan Siliqi, and Gianfranco Carotenuto. "Photoconductivity of tellurium-poly(methyl methacrylate) in the ultraviolet–visible-near infrared range." Applied Surface Science 457 (November 2018): 229–34. http://dx.doi.org/10.1016/j.apsusc.2018.06.221.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Del Pozo, Susana, Roderik Lindenbergh, Pablo Rodríguez-Gonzálvez, Jan Kees Blom, and Diego González-Aguilera. "Discrimination between Sedimentary Rocks from Close-Range Visible and Very-Near-Infrared Images." PLOS ONE 10, no. 7 (July 6, 2015): e0132471. http://dx.doi.org/10.1371/journal.pone.0132471.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Albert, O., and G. Mourou. "Single optical cycle laser pulse in the visible and near-infrared spectral range." Applied Physics B: Lasers and Optics 69, no. 3 (September 1, 1999): 207–9. http://dx.doi.org/10.1007/s003400050795.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Engvold, Oddbjørn. "The Near-Infrared Capabilities of LEST." Symposium - International Astronomical Union 154 (1994): 579–88. http://dx.doi.org/10.1017/s0074180900124878.

Full text

Abstract:

The Large Earth-based Solar Telescope (LEST) will be a powerful, next-generation telescope with unprecedented angular resolution, capable of highly accurate polarimetry of the Sun, covering the optical spectral range from about 300 nm into the near infrared to about 2.5 μm.The telescope is a 2.4-m aperture, “polarization-free” concept based on a modified Gregorian optical system. A fast polarization modulator will be located close to the secondary focus of the system. An actively controlled NTT-type main mirror, a high precision pointing and tracking system, a helium-filled light path and a thin entrance window, together with an integrated adaptive optics system, will give the telescope near diffraction-limited performance in the visible. LEST will be sited on La Palma, in the Canary Islands, near the caldera rim on the Roque de los Muchachos Observatory, which often offers excellent seeing. A frequently occurring seeing parameter of ro = 15–20 cm in the visible will correspond to ro ≥ 1 m in the near IR.The construction of LEST will begin in 1993, and the telescope is to be ready for “first light” in 1997. The telescope facility will accommodate a large number of focal plane instruments on a spacious instrument table. LEST will be made available for near-IR instrumentation from the start of its regular operation.

APA, Harvard, Vancouver, ISO, and other styles

32

Mukhopadhya, N., A. Saha, and K. Bhattacharya. "Super-achromatic Quarter-wave Phase Retarder for Visible, Near Infrared and Short Wave Infrared Region Applications-=SUP=-*-=/SUP=-." Журнал технической физики 128, no. 8 (2020): 1177. http://dx.doi.org/10.21883/os.2020.08.49717.383-19.

Full text

Abstract:

Phase retarders are essential components in optical system design as they can control the phase shifts associated with the vector components of incoming light waves and hence, decide the state of polarization. Different optical systems are designed to work at different wavelength spectrums. Most of these developments focus on the different wavelength regions between visible to infrared, of which the near infrared and short-wave infrared ranges are popular domains for defense and remote sensing applications. In this present communication, a super achromatic quarter-wave phase retarder consisting of four birefringent plates of different materials, i. e. KDP, crystalline quartz, ADP and ZnS has been proposed, to cover the visible, near infrared and short wave infrared regions from 400-2100 nm. As circularly polarized light is less affected by atmospheric conditions the use of an achromatic broadband quarter-wave phase retarder as proposed is quite useful. The proposed system shows acceptable performance over the intended range of wavelengths. Keywords: Wave plates, Super achromatic, Retarder, SWIR.

APA, Harvard, Vancouver, ISO, and other styles

33

Mogensen, Klaus Bo, Marina Gühlke, Janina Kneipp, Shima Kadkhodazadeh, Jakob B. Wagner, Marta Espina Palanco, Harald Kneipp, and Katrin Kneipp. "Surface-enhanced Raman scattering on aluminum using near infrared and visible excitation." Chem. Commun. 50, no. 28 (2014): 3744–46. http://dx.doi.org/10.1039/c4cc00010b.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Tao, Feifei, Haibo Yao, Zuzana Hruska, Yongliang Liu, Kanniah Rajasekaran, and Deepak Bhatnagar. "Detection of aflatoxin B1 on corn kernel surfaces using visible-near infrared spectroscopy." Journal of Near Infrared Spectroscopy 28, no. 2 (December 18, 2019): 59–69. http://dx.doi.org/10.1177/0967033519895686.

Full text

Abstract:

In this study, visible-near infrared spectroscopy over the spectral range of 400–2500 nm was utilized to detect surface contamination of corn kernels with aflatoxin B1. The artificially contaminated samples were prepared by dropping known amounts of aflatoxin B1 standard dissolved in 50:50 ( v/ v) methanol/water solution, onto corn kernel surface to achieve different contamination levels of 10, 20, 50, 100, 500, and 1000 ppb. Both endosperm and germ sides of corn kernels were used for artificial contamination, and a total of 210 contaminated and control kernels were scanned with the visible-near infrared spectroscopy in reflectance mode. Spectral preprocessing methods including standard normal variate, first derivative, second derivative, first derivative + standard normal variate, and second derivative + standard normal variate were applied on the original absorbance spectra. Using the original and preprocessed spectra, the 3-class and 7-class discriminant models were established by the chemometric methods of principal component analysis-linear discriminant analysis and partial least squares discriminant analysis separately. The results showed that in discriminating the aflatoxin B1 contamination levels, the spectral range II (1120–2470 nm) generally performed better than using the corresponding spectra type over range I (410–1070 nm). Compared to using the original spectra, the first derivative and second derivative spectra generally improved the performance of the classification models. For classification thresholds of 20 and 100 ppb in aflatoxin B1, the best 3-class models achieved the same overall accuracy of 98.6% for prediction over both ranges I and II. For the 7-class discriminant models, the best overall accuracies obtained over ranges I and II are 91.4 and 97.1% for prediction.

APA, Harvard, Vancouver, ISO, and other styles

35

Khan, Haris, Sofiane Mihoubi, Benjamin Mathon, Jean-Baptiste Thomas, and Jon Hardeberg. "HyTexiLa: High Resolution Visible and Near Infrared Hyperspectral Texture Images." Sensors 18, no. 7 (June 26, 2018): 2045. http://dx.doi.org/10.3390/s18072045.

Full text

Abstract:

We present a dataset of close range hyperspectral images of materials that span the visible and near infrared spectrums: HyTexiLa (Hyperspectral Texture images acquired in Laboratory). The data is intended to provide high spectral and spatial resolution reflectance images of 112 materials to study spatial and spectral textures. In this paper we discuss the calibration of the data and the method for addressing the distortions during image acquisition. We provide a spectral analysis based on non-negative matrix factorization to quantify the spectral complexity of the samples and extend local binary pattern operators to the hyperspectral texture analysis. The results demonstrate that although the spectral complexity of each of the textures is generally low, increasing the number of bands permits better texture classification, with the opponent band local binary pattern feature giving the best performance.

APA, Harvard, Vancouver, ISO, and other styles

36

Du, Xiaoli, Zeliang Gao, Lijuan Chen, Youxuan Sun, and Xutang Tao. "High laser damage threshold LiNa5Mo9O30 prism: for visible to mid-infrared range." Chinese Optics Letters 20, no. 5 (2022): 051602. http://dx.doi.org/10.3788/col202220.051602.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

de Jesus, Roberta Anjos, Leonis Lourenço da Luz, Danilo Oliveira Santos, José Arnaldo Santana Costa, Sandro Navickiene, Claudia Cristina Gatto, Severino Alves Júnior, and Maria Eliane de Mesquita. "Dual emission tunable in the near-infrared (NIR) and visible (VIS) spectral range by mix-LnMOF." Dalton Transactions 44, no. 39 (2015): 17318–25. http://dx.doi.org/10.1039/c5dt01920f.

Full text

Abstract:

In this study, we describe the synthetic approach, crystallographic structure, luminescent behavior in heteronuclear coordination polymers with emission in the visible (Eu³⁺ and organic ligand) and near-infrared (Nd³⁺) range.

APA, Harvard, Vancouver, ISO, and other styles

38

Gabka, Grzegorz, Piotr Bujak, Kamil Kotwica, Andrzej Ostrowski, Wojciech Lisowski, Janusz W. Sobczak, and Adam Pron. "Luminophores of tunable colors from ternary Ag–In–S and quaternary Ag–In–Zn–S nanocrystals covering the visible to near-infrared spectral range." Physical Chemistry Chemical Physics 19, no. 2 (2017): 1217–28. http://dx.doi.org/10.1039/c6cp07008f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

ABDULRAHMAN, Hayder J., and Suzan B. MOHAMMED. "DEVELOPMENT OF ULTRA-SHORT HIGH INTENSITY LASERS FOR THE VISIBLE SPECTRA RANGE." Periódico Tchê Química 17, no. 35 (July 20, 2020): 739–52. http://dx.doi.org/10.52571/ptq.v17.n35.2020.63_abdulrahman_pgs_739_752.pdf.

Full text

Abstract:

Ultra-short laser pulses are particularly suitable for processing micro tools made of ultra-hard and dielectric materials. Ultra-short laser pulses provide a contact-free and precise fabrication of heat-sensitive materials such as visible spectra range. Visible spectra range has unique properties, which makes it an essential material in the tool, jewelry, and semiconductor industries. The processing of visible spectra range by ultra-short laser pulses is complex, as visible and near-infrared light is generally not absorbed. However, the intensity of ultra-short laser pulses is extremely high, so that the absorption scales nonlinearly with the intensity and, thus, visible or near-infrared light can be absorbed. The complexity also results from many partially interdependent process variables, such as the repetition rate, pulse overlap, track overlap, and scan speed. Excellent knowledge of the process is, therefore, essential for the production of micro tools. To make the laser processing accessible to a broader user field, the operator can be supported by a computer-aided design (CAD). The aim of this research was to the modeling of an ultra-short high-intensity laser for the visible spectra range in different environments of the angle of incidence, scanning speed, pulse, and track overlap. The experimental process included ultra-short pulsed laser processing of visible spectra range and surface analysis concerning modifications and ablation of the ultra-short laser. Ablation volumes were analyzed for single pulses, multi-pulses, and pockets. Pump-probe experiments reveal transient optical properties such as transmission or reflectivity. It was concluded that ultraviolet laser pulses are best suited to induce damage or modifications to visible spectra range surfaces. Additionally, shorter wavelengths have further advantages such as potentially longer Rayleigh lengths and smaller spot sizes.

APA, Harvard, Vancouver, ISO, and other styles

40

Clouet, Axel, Célia Viola, and Jérôme Vaillant. "Visible to near-infrared multispectral images dataset for image sensors design." Electronic Imaging 2020, no. 5 (January 26, 2020): 106–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.5.maap-082.

Full text

Abstract:

In this paper we present a set of multispectral images covering the visible and near-infrared spectral range (400 nm to 1050 nm). This dataset intends to provide spectral reflectance images containing daily life objects, usable for silicon image sensor simulations. All images were taken with our acquisition bench and a particular attention was brought to processings in order to provide calibrated reflectance data. ReDFISh (Reflectance Dataset For Image sensor Simulation) is available at: http://dx.doi.org/10.18709/perscido.2020.01.ds289.

APA, Harvard, Vancouver, ISO, and other styles

41

García, Iñaki López, Mario Siciliani de Cumis, Davide Mazzotti, Iacopo Galli, Pablo Cancio Pastor, and Paolo De Natale. "Silicon-Based Multilayer Waveguides for Integrated Photonic Devices from the Near to Mid Infrared." Applied Sciences 11, no. 3 (January 29, 2021): 1227. http://dx.doi.org/10.3390/app11031227.

Full text

Abstract:

Advancements in spectroscopy, quantum optics, communication, and sensing require new classes of integrated photonic devices to host a wide range of non-linear optical processes involving wavelengths from the visible to the infrared. In this framework, waveguide (WG) structures designed with innovative geometry and materials can play a key role. We report both finite element modeling and experimental characterization of silicon nitride multilayer WGs from the visible to the mid-infrared spectral regions. The simulations evaluated optical behavior and mechanical stress as a function of number of WG layers and photonic structure dimensions. WGs were optimized for waveguiding at 1550 nm and 2640 nm. Experimental characterization focused on optical behavior and coupling losses from 532 nm to 2640 nm. Measured losses in WGs indicate a quasi-perfect waveguiding behavior in the IR range (with losses below 6 dB), with a relevant increase (up to 20 dB) in the visible range.

APA, Harvard, Vancouver, ISO, and other styles

42

Noirbent, Guillaume, Yangyang Xu, Aude-Héloise Bonardi, Sylvain Duval, Didier Gigmes, Jacques Lalevée, and Frédéric Dumur. "New Donor-Acceptor Stenhouse Adducts as Visible and Near Infrared Light Polymerization Photoinitiators." Molecules 25, no. 10 (May 15, 2020): 2317. http://dx.doi.org/10.3390/molecules25102317.

Full text

Abstract:

Polymerization photoinitiators that can be activated under low light intensity and in the visible range are being pursued by both the academic and industrial communities. To efficiently harvest light and initiate a polymerization process, dyes with high molar extinction coefficients in the visible range are ideal candidates. In this field, Donor-acceptor Stenhouse Adducts (DASA) which belong to a class of recently discovered organic photochromic molecules still lack practical applications. In this work, a series of DASA-based dyes are proposed as photoinitiators for the free radical polymerization of (meth)acrylates upon exposure to a near infrared light (laser diode at 785 nm).

APA, Harvard, Vancouver, ISO, and other styles

43

Sola, Daniel, Adrián Miguel, Eduardo Arias-Egido, and Jose I. Peña. "Spectroscopy and Near-Infrared to Visible Upconversion of Er3+ Ions in Aluminosilicate Glasses Manufactured with Controlled Optical Transmission." Applied Sciences 11, no. 3 (January 26, 2021): 1137. http://dx.doi.org/10.3390/app11031137.

Full text

Abstract:

In this work we report on the spectroscopic properties and the near-infrared to visible upconversion of Er3+ ions in aluminosilicate glasses manufactured by directionally solidification with the laser floating zone technique. Glasses were manufactured in a controlled oxidizing atmosphere to provide them with high optical transmission in the visible spectral range. Absorption and emission spectra, and lifetimes were assessed in both the visible and the near infrared spectral range. Green upconversion emissions of the 2H11/2→4I15/2 and 4S3/2→4I15/2 transitions at 525 nm and 550 nm attributed to a two-photon process were observed under excitation at 800 nm. Mechanisms responsible for the upconversion luminescence were discussed in terms of excited state absorption and energy transfer upconversion processes. Excitation spectra of the upconverted emission suggest that energy transfer upconversion processes are responsible for the green upconversion luminescence.

APA, Harvard, Vancouver, ISO, and other styles

44

Yang, Xing, Yong Shun Ling, Xiao Li Hao, Hua Yang, and Peng Ma. "Anti-Alteration Technology for License Plate Recognition System." Advanced Materials Research 211-212 (February 2011): 156–60. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.156.

Full text

Abstract:

In order to realize anti-alteration function for License Plate Recognition System (LPRS), a uniform-field imaging system is designed and a corresponding anti-alteration algorithm is proposed. First, reflection characteristics of license plate and typical alteration material are measured. As a result, the two characteristics in near-infrared range fluctuate moderately and the former is notably lower than the latter. Then the uniform-field imaging system for visible-light and near-infrared is designed to capture the difference above effectively. Finally, the anti-alteration algorithm, composed of license plate location, character matching segmentation and alteration recognition, is introduced. Experimental results have indicated that visible-light and near-infrared images can be acquired stably by the proposed system under the condition of natural illumination and there are discriminable gray differences between license plate and alteration material in near-infrared images; and that success rate and average executive time of the algorithm are 86.5% and 157ms respectively.

APA, Harvard, Vancouver, ISO, and other styles

45

Žiljak Gršić, Jana, Silvio Plehati, Ivana Žiljak Stanimirović, and Tomislav Bogović. "Properties of Dyes for Painting with Spectroscopy in the Visible and Near Infrared Range." Applied Sciences 13, no. 4 (February 15, 2023): 2483. http://dx.doi.org/10.3390/app13042483.

Full text

Abstract:

This study focuses on the properties of reflection and absorption of light in the visible and near infrared range of acrylic dyes and related materials for coloring. The research aims to understand the use of acrylic dyes in fine arts and to simulate these dyes for printing purposes. Two groups of acrylic dyes were studied using spectroscopy to determine their light absorption properties in the visible (VIS) and near infrared (NIR) regions. The measurements were performed with forensic cameras equipped with 24 light filters in the range of 400–1000 nm. The results of the digital recordings were compared with video surveillance cameras that operate and record during the day and night. The same color had at least two formulations of dyes for print reproduction to simulate what the naked eye sees and to simulate light absorption in the NIR spectrum. The study aimed to gain a deeper understanding of the properties of acrylic paints and related materials, considering how they can be used in fine arts and how to simulate them in printing.

APA, Harvard, Vancouver, ISO, and other styles

46

Shen, Zefang, Haylee D'Agui, Lewis Walden, Mingxi Zhang, Tsoek Man Yiu, Kingsley Dixon, Paul Nevill, et al. "Miniaturised visible and near-infrared spectrometers for assessing soil health indicators in mine site rehabilitation." SOIL 8, no. 2 (July 18, 2022): 467–86. http://dx.doi.org/10.5194/soil-8-467-2022.

Full text

Abstract:

Abstract. Mining can cause severe disturbances to the soil, which underpins the viability of terrestrial ecosystems. Post-mining rehabilitation relies on measuring soil properties that are critical indicators of soil health. Soil visible–near-infrared (vis–NIR) spectroscopy is rapid, accurate, and cost-effective for estimating a range of soil properties. Recent advances in infrared detectors and microelectromechanical systems (MEMSs) have produced miniaturised, relatively inexpensive spectrometers. Here, we evaluate the spectra from four miniaturised visible and NIR spectrometers, some combinations, and a full-range vis–NIR spectrometer for modelling 29 soil physical, chemical, and biological properties used to assess soil health at mine sites. We collected topsoil samples from reference, undisturbed native vegetation, and stockpiles from seven mines in Western Australia. We evaluated the spectrometers' repeatability and the accuracy of spectroscopic models built with seven statistical and machine learning algorithms. The spectra from the visible spectrometer could estimate sand, silt, and clay with similar or better accuracy than the NIR spectrometers. However, the spectra from the NIR spectrometers produced better estimates of soil chemical and biological properties. By combining the miniaturised visible and NIR spectrometers, we improved the accuracy of their soil property estimates, which were similar to those from the full-range spectrometer. The miniaturised spectrometers and combinations predicted 24 of the 29 soil properties with moderate or greater accuracy (Lin's concordance correlation, ρc≥0.65). The repeatability of the NIR spectrometers was similar to that of the full-range, portable spectrometer. The miniaturised NIR spectrometers produced comparably accurate soil property estimates to the full-range portable system which is an order of magnitude more expensive, particularly when combined with the visible range sensor. Thus, the miniaturised spectrometers could form the basis for a rapid, cost-effective soil diagnostic capacity to support mine site rehabilitation and deliver significant positive economic and environmental outcomes.

APA, Harvard, Vancouver, ISO, and other styles

47

MIZUMOTO, IWAO. "Simple type extreme faint light monitoring device measurable from visible to near infrared range." Journal of the Spectroscopical Society of Japan 45, no. 6 (1996): 289–90. http://dx.doi.org/10.5111/bunkou.45.289.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Michel, Carlos R., and Alma H. Martínez-Preciado. "New photosensing properties of nanostructured GdCoO3 in the ultraviolet (A)-visible-near infrared range." Optical Materials 124 (February 2022): 111968. http://dx.doi.org/10.1016/j.optmat.2022.111968.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Lan, Zhaojue, Yanlian Lei, Wing Kin Edward Chan, Shuming Chen, Dan Luo, and Furong Zhu. "Near-infrared and visible light dual-mode organic photodetectors." Science Advances 6, no. 5 (January 2020): eaaw8065. http://dx.doi.org/10.1126/sciadv.aaw8065.

Full text

Abstract:

We report a dual-mode organic photodetector (OPD) that has a trilayer visible light absorber/optical spacer/near-infrared (NIR) light absorber configuration. In the presence of NIR light, photocurrent is produced in the NIR light–absorbing layer due to the trap-assisted charge injection at the organic/cathode interface at a reverse bias. In the presence of visible light, photocurrent is produced in the visible light–absorbing layer, enabled by the trap-assisted charge injection at the anode/organic interface at a forward bias. A high responsivity of >10 A/W is obtained in both short and long wavelengths. The dual-mode OPD exhibits an NIR light response operated at a reverse bias and a visible light response operated at a forward bias, with a high specific detectivity of ~1013 Jones in both NIR and visible light ranges. A bias-switchable spectral response OPD offers an attractive option for applications in environmental pollution detection, bioimaging process, wellness, and security monitoring in two distinct bands.

APA, Harvard, Vancouver, ISO, and other styles

50

Rahmi, K. I. N., N. Febrianti, and I. Prasasti. "Forest and land fire smoke detection using GCOM-C data (case study: Pulang Pisau, Central Kalimantan)." IOP Conference Series: Earth and Environmental Science 893, no. 1 (November 1, 2021): 012068. http://dx.doi.org/10.1088/1755-1315/893/1/012068.

Full text

Abstract:

Abstract Forest/land fire give bad impact of heavy smoke on peatland area in Indonesia. Forest/land fire smoke need to be identified the distribution periodically. New satellite of GCOM-C has been launched to monitor climate condition and have visible, near infrared and thermal infrared. This study has objective to identify fire smoke from GCOM-C data. GCOM-C data has wavelength range from 0.38 to 12 μm it covers visible, near infrared, short-wave infrared and thermal infrared. It is relatively similar to MODIS or Himawari-8 images which could identify forest/land fire smoke. The methodology is visual interpretation to detect forest/land fire smoke using near infrared band (VN08), shortwave infrared band (SW03), and thermal bands (T01 and T02). Hotspot data is overlaid with GCOM-C image to represent the location of fire events. Combination of composite RGB image has been applied to detect forest/land fire smoke. GCOM-C image of VN8 bands and combination of thermal band in composite image could be used to detect fire smoke in Pulang Pisau, Central Kalimantan.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Visible and near-infrared range'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles