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Journal articles on the topic 'F noise spectroscopy'

Author: Grafiati

Published: 6 September 2023

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1

Kale, Uma, and Edward Voigtman. "Gated Integration of Transient Signals in 1/f Noise." Applied Spectroscopy 46, no. 11 (1992): 1636–43. http://dx.doi.org/10.1366/0003702924926916.

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The Mueller optical calculus is used to model common spectrometric experimental schemes. The effects of source and preamplifier noise on the precision of the measurement are investigated, and the effect of gate width variation for gated integration of Gaussian signal peaks in the presence of white or 1/ f type noise is evaluated. The results indicate that, for integration of a transient absorbance signal, the choice of gate width depends upon the type of noise, but not its source. For a transmittance (or emission) type of experiment, both the type and the source of the noise determine the gate

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2

Lübbe, Jannis, Matthias Temmen, Philipp Rahe, and Michael Reichling. "Noise in NC-AFM measurements with significant tip–sample interaction." Beilstein Journal of Nanotechnology 7 (December 1, 2016): 1885–904. http://dx.doi.org/10.3762/bjnano.7.181.

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The frequency shift noise in non-contact atomic force microscopy (NC-AFM) imaging and spectroscopy consists of thermal noise and detection system noise with an additional contribution from amplitude noise if there are significant tip–sample interactions. The total noise power spectral density D Δ f (f m) is, however, not just the sum of these noise contributions. Instead its magnitude and spectral characteristics are determined by the strongly non-linear tip–sample interaction, by the coupling between the amplitude and tip–sample distance control loops of the NC-AFM system as well as by the ch

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3

Achtenberg, Krzysztof, Janusz Mikołajczyk, Zbigniew Bielecki, and Jacek Wojtas. "Cross-correlation method for noise measurements of photodetectors used for laser absorption spectroscopy." Bulletin of the Military University of Technology 69, no. 4 (2020): 73–83. http://dx.doi.org/10.5604/01.3001.0015.3826.

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The paper presents noise measurements of low-resistance photon detectors with a specially developed system. These measurements are significant for many applications. This issue is particularly critical for laser absorption spectroscopy systems to detect trace amounts of gases. In these systems, the detection limit is determined by noise origins, e.g., light source, background, and detector noise and its readout electronics. The use of some specially designed components of the system (low-noise - 3.6 × 10<sub>-19</sub> V<sub>2</sub>/Hz for f >1 kHz) cross-correlation

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4

Stadler, Adam, and Andrzej Dziedzic. "Virtual instruments in low-frequency noise spectroscopy experiments." Facta universitatis - series: Electronics and Energetics 28, no. 1 (2015): 17–28. http://dx.doi.org/10.2298/fuee1501017s.

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Low-frequency noise spectroscopy (LFNS) is an experimental technique to study noise spectra, typically below 10 kHz, as a function of temperature. Results of LFNS may be presented as the ?so-called? noise maps, giving a detailed insight into fluctuating phenomena in electronic devices and materials. The authors show the usefulness of virtual instrument concept in developing and controlling the measurement setup for LFNS experiments. An example of a noise map obtained for polymer thick-film resistors (PTFRs), made of commercial compositions, for temperature range 77 K - 300 K has been shown. Th

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Kawahara, Toshio, Satarou Yamaguchi, Yasuhide Ohno, et al. "Diameter dependence of 1/f noise in carbon nanotube field effect transistors using noise spectroscopy." Applied Surface Science 267 (February 2013): 101–5. http://dx.doi.org/10.1016/j.apsusc.2012.08.003.

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6

Monnig, Curtis A., and Gary M. Hieftje. "An Investigation of Noise Amplitude Spectra Produced by a Direct-Current Plasma." Applied Spectroscopy 43, no. 5 (1989): 742–46. http://dx.doi.org/10.1366/0003702894202283.

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Noise amplitude spectra for direct-current plasma atomic emission spectrometry (DCP-AES) were acquired. Flicker (1/ f) noise dominates the signal at low frequencies, and white noise prevails at higher frequencies. Broad-band audio-frequency (af) noise was observed in the plasma continuum emission when the nebulizer gas was directed into the discharge. By increasing the electrode-gas flows, it was possible to narrow the frequency range and increase the amplitude of this af noise. The introduction of an easily ionized element into the plasma had little effect on the noise characteristics of the

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7

Stadler, Adam Witold, Zbigniew Zawiślak, Andrzej Dziedzic, and Damian Nowak. "NOISE SPECTROSCOPY OF RESISTIVE COMPONENTS AT ELEVATED TEMPERATURE." Metrology and Measurement Systems 21, no. 1 (2014): 15–26. http://dx.doi.org/10.2478/mms-2014-0002.

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Abstract Studies of electrical properties, including noise properties, of thick-film resistors prepared from various resistive and conductive materials on LTCC substrates have been described. Experiments have been carried out in the temperature range from 300 K up to 650 K using two methods, i.e. measuring (i) spectra of voltage fluctuations observed on the studied samples and (ii) the current noise index by a standard meter, both at constant temperature and during a temperature sweep with a slow rate. The 1/f noise component caused by resistance fluctuations occurred to be dominant in the ent

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8

Lebedev, Alexander A., Vitalii V. Kozlovski, Leonid Fursin, et al. "Impact of Proton Irradiation on Power 4H-SiC MOSFETs." Materials Science Forum 1004 (July 2020): 1074–80. http://dx.doi.org/10.4028/www.scientific.net/msf.1004.1074.

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Impact of 15 MeV proton irradiation on electrical characteristics and low frequency noise has been studied in high-power vertical 4H-SiC MOSFETs of 1.2 kV-class at doses 1012 £ F £ 1014 cm-2. The maximum value of the field-effect mobility µFЕ depends weakly on F up to F = 2×1013 cm-2. At F = 4×1013 cm-2, the character of the µFЕ(Vg) dependence changes radically. The maximum µFЕ decreases approximately threefold. The dose Fcr corresponding to the complete degradation of the device is about 1014 cm-2. It can be estimated as Fcr» he/n0, where he is the electron removal rate and n0 is the initial

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9

Holmberg, Måns, and Nikku Madhusudhan. "Exoplanet spectroscopy with JWST NIRISS: diagnostics and case studies." Monthly Notices of the Royal Astronomical Society 524, no. 1 (2023): 377–402. http://dx.doi.org/10.1093/mnras/stad1580.

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ABSTRACT The JWST is ushering in a new era in remote sensing of exoplanetary atmospheres. Atmospheric retrievals of exoplanets can be highly sensitive to high-precision JWST data. It is, therefore, imperative to characterize the instruments and noise sources using early observations to enable robust characterization of exoplanetary atmospheres using JWST-quality spectra. This work is a step in that direction, focusing on the Near Infrared Imager and Slitless Spectrograph (NIRISS) Single Object Slitless Spectroscopy (SOSS) instrument mode, with a wavelength coverage of 0.6–2.8 $\mu$m and R ∼ 70

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10

Zheng-Chao, Dong. "Spin-Polarized Tunneling Spectroscopy and Shot Noise in Ferromagnet/ f -Wave Superconductor Junctions." Communications in Theoretical Physics 41, no. 5 (2004): 775–80. http://dx.doi.org/10.1088/0253-6102/41/5/775.

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11

Kaku, K., A. T. Williams, B. G. Mendis, and C. Groves. "Examining charge transport networks in organic bulk heterojunction photovoltaic diodes using 1/f noise spectroscopy." Journal of Materials Chemistry C 3, no. 23 (2015): 6077–85. http://dx.doi.org/10.1039/c5tc00348b.

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In this article we present 1/f noise spectroscopy measurements relating to charge transport networks in poly(3-hexylthiophene) (P3HT):phenyl-C<sub>61</sub>-butyric acid methyl ester (PCBM) space-charge limited diode (SCLD) and organic photovoltaic (OPV) devices.

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12

Busch, Kenneth W., Marianna A. Busch, Renaud Mercier Ythier, and Arvie J. Kuehn. "Design Parameters for an Optimized Flame/Furnace Infrared Emission (FIRE) Radiometer." Applied Spectroscopy 47, no. 12 (1993): 2072–80. http://dx.doi.org/10.1366/0003702934066433.

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Several design aspects of an optimized flame/furnace infrared emission (FIRE) radiometer are discussed. For a source in thermal equilibrium, the optimum excitation temperature for CO2 is predicted to be 2500 K, based on the stability of the molecule and the population of excited states as functions of temperature. The influence of spectral bandpass on the magnitude of flame background was studied for several wavelengths within the profile of the 4.4-µm emission band of CO2. For the dispersive FIRE radiometer used in this study, the system was found to be detectornoise limited over the range of

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13

Ibrahim, Kiagus Aufa, Marlin Ramadhan Baidillah, Ridwan Wicaksono, and Masahiro Takei. "Skin layer classification by feedforward neural network in bioelectrical impedance spectroscopy." Journal of Electrical Bioimpedance 14, no. 1 (2023): 19–31. http://dx.doi.org/10.2478/joeb-2023-0004.

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Abstract Conductivity change in skin layers has been classified by source indicator ok (k=1: Stratum corneum, k=2: Epidermis, k=3: Dermis, k=4: Fat, and k=5: Stratum corneum + Epidermis) trained from feedforward neural network (FNN) in bioelectrical impedance spectroscopy (BIS). In BIS studies, treating the skin as a bulk, limits the differentiation of conductivity changes in individual skin layers, however skin layer classification using FNN shows promise in accurately categorizing skin layers, which is essential for predicting source indicators ok and initiating skin dielectric characteristi

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14

Shin, Wonjun, Kyung Kyu Min, Jong-Ho Bae, et al. "Comprehensive and accurate analysis of the working principle in ferroelectric tunnel junctions using low-frequency noise spectroscopy." Nanoscale 14, no. 6 (2022): 2177–85. http://dx.doi.org/10.1039/d1nr06525d.

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In contrast to RRAMs, the 1/f noise of the FTJ in the LRS is approximately two orders of magnitude larger than that in the HRS, indicating that the conduction mechanism in each state differs significantly.

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15

Strange, K. Alicia, Kelly C. Paul, and S. Michael Angel. "Transmission Raman Measurements Using a Spatial Heterodyne Raman Spectrometer (SHRS)." Applied Spectroscopy 71, no. 2 (2016): 250–57. http://dx.doi.org/10.1177/0003702816654156.

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A spatial heterodyne Raman spectrometer (SHRS) was used to measure transmission Raman spectra of highly scattering compounds. Transmission Raman spectral intensities of ibuprofen were only 2.4 times lower in intensity than backscatter Raman spectra. The throughput was about eight times higher than an f/1.8 dispersive spectrometer, and the width of the area viewed was found to be seven to nine times higher, using 50.8 mm and 250 mm focal length collection lenses. However, the signal-to-noise (S/N) ratio was two times lower for the SHRS than the f/1.8 dispersive spectrometer, apparently due to h

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16

Tong, William G., and Dennis A. Chen. "Doppler-Free Spectroscopy Based on Phase Conjugation by Degenerate Four-Wave Mixing in Hollow Cathode Discharge." Applied Spectroscopy 41, no. 4 (1987): 586–90. http://dx.doi.org/10.1366/0003702874448599.

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Optical phase conjugation in the hollow cathode lamp by degnerate four-wave mixing is a novel analytical laser spectroscopic method in which a laser beam is generated as the signal beam. With the use of a demountable hollow cathode discharge cell and a continuous-wave dye laser, the signal beam is clearly visible to the naked eye when 1 µg of sodium is placed inside the cathode cavity. Since the signal beam is a time-reversed replica of the probe laser beam, highly efficient optical signal detection can be performed with minimum optical background noise. Since the signal is Doppler-free with n

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17

Mu, Ye, Tianli Hu, He Gong, Ruiwen Ni, and Shijun Li. "A Trace C2H2 Sensor Based on an Absorption Spectrum Technique Using a Mid-Infrared Interband Cascade Laser." Micromachines 9, no. 10 (2018): 530. http://dx.doi.org/10.3390/mi9100530.

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In this study, tunable diode laser absorption spectroscopy (TDLAS) combined with wavelength modulation spectroscopy (WMS) was used to develop a trace C2H2 sensor based on the principle of gas absorption spectroscopy. The core of this sensor is an interband cascade laser that releases wavelength locks to the best absorption line of C2H2 at 3305 cm−1 (3026 nm) using a driving current and a working temperature control. As the detected result was influenced by 1/f noise caused by the laser or external environmental factors, the TDLAS-WMS technology was used to suppress the 1/f noise effectively, t

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18

Sita, Zdenek, Vlasta Sedlakova, Jiri Majzner, Petr Sedlak, Josef Sikula, and Lubomir Grmela. "Analysis of Noise and Non-Linearity of I-V Characteristics of Positive Temperature Coefficient Chip Thermistors." Metrology and Measurement Systems 20, no. 4 (2013): 635–44. http://dx.doi.org/10.2478/mms-2013-0054.

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Abstract Noise spectroscopy and I-V characteristic non-linearity measurement were applied as diagnostic tools in order to characterize the volume and contact quality of positive temperature coefficient (PTC) chip sensors and to predict possible contact failure. Correctly made and stable contacts are crucial for proper sensing. I-V characteristics and time dependences of resistance were measured for studied sensors and, besides the samples with stable resistance value, spike type resistance fluctuation was observed for some samples. These spikes often disappear after about 24 hours of voltage a

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19

Ho, W. Y., W. K. Fong, Charles Surya, K. Y. Tong, L. W. Lu, and W. K. Ge. "Characterization of Hot-Electron Effects on Flicker Noise in III-V Nitride Based Heterojunctions." MRS Internet Journal of Nitride Semiconductor Research 4, S1 (1999): 560–64. http://dx.doi.org/10.1557/s1092578300003045.

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We report experiments on hot-electron stressing in commercial III-V nitride based heterojunction light-emitting diodes. Stressing currents ranging from 100 mA to 200 mA were used. Degradations in the device properties were investigated through detailed studies of the I-V characteristics, electroluminescence, Deep-Level Transient Fourier Spectroscopy and flicker noise. Our experimental data demonstrated significant distortions in the I-V characteristics. The room temperature electroluminescence of the devices exhibited 25% decrement in the peak emission intensity. Concentration of the deep-leve

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20

Barone, C., P. Orgiani, G. Carapella, V. Granata, S. K. Chaluvadi, and S. Pagano. "Investigation of topological regime in Bi₂Se₃ thin films through low-frequency electric noise." Applied Physics Letters 122, no. 14 (2023): 143103. http://dx.doi.org/10.1063/5.0144893.

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Topological insulators are considered new states of quantum matter that cannot be systematically related to conventional insulators and semiconductors. Among them, Bi2Se3 has attracted an increasing interest due to a simple surface band structure and due to a strong contribution of the surface to transport. While the dc electric transport properties have been extensively studied, intrinsic fluctuations and their effect on the surface conduction have received less attention. In order to better investigate these aspects, a detailed characterization of the low-frequency noise, also known as noise

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21

Zubrzycka, W., and P. Grybos. "Optimization of low-noise read-out electronics for high energy resolution X-ray strip detectors." Journal of Instrumentation 18, no. 01 (2023): C01033. http://dx.doi.org/10.1088/1748-0221/18/01/c01033.

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Abstract Semiconductor strip sensors applied as solid-state radiation or particle detectors can be used in radiation detection and measurement for various applications in particle physics experiments, X-ray imaging (e.g. medical), or material science. The X-ray imaging devices with spectroscopic and position resolution features are a very important research topic at many institutes and companies worldwide. Short strip silicon detectors are good candidates for X-ray spectroscopy, because of their relatively small capacitance and leakage current. If additionally, strip pitch is below 100 μm, the

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22

Muthukumaran, B., and B. Ramachandran. "High Gain CMOS Transimpedance Amplifier For Near Infrared Spectroscopy Applications." Journal of Physics: Conference Series 2335, no. 1 (2022): 012039. http://dx.doi.org/10.1088/1742-6596/2335/1/012039.

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Abstract In this paper, design and analysis of High Gain CMOS Transimpedance Amplifier (HGCTIA) is presented which is greatly necessitated for frequency domain functional Near Infrared Spectroscopy (FD-f NIRS). Generally, feedback resistor and drain resistor play a major role in deciding TIA gain and bandwidth. Most of the research work have utilized only feedback resistor and drain resistor. Here, the gain improvement is greatly achieved by replacing the drain resistor by an active inductor which is designed using CMOS transistor. The active inductor loaded based TIA exhibits only 0.01mW powe

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23

Лебедев, А. А., М. Е. Левинштейн, П. А. Иванов та ін. "Влияние протонного облучения (15 МэВ) на низкочастотный шум мощных SiC MOSFETs". Физика и техника полупроводников 53, № 12 (2019): 1604. http://dx.doi.org/10.21883/ftp.2019.12.48610.9219.

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Low frequency noise has been studied in power4H-SiC MOSFETs after proton(15 MeV) irradiation. The noise was studied at room temperature in the frequency range 1 Hz−50 kHz after irradiation with doses of 1012 ≤Ф≤ 6•1013 cm−2. Frequency dependence of the spectral noise density SI follows with good accuracy to the law SI∝1/f. The correlation between the saturation current of the output characteristics of Id(Vd) and the level of low-frequency noise is established. In the dose range Ф studied the value of the saturation current varies within about 20%, while the noise level changes by 2orders of ma

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24

Shin, Wonjun, Jong-Ho Bae, Jaehyeon Kim, et al. "Variability analysis of ferroelectric FETs in program operation using low-frequency noise spectroscopy." Applied Physics Letters 121, no. 16 (2022): 163501. http://dx.doi.org/10.1063/5.0111309.

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We investigate the variability of a ferroelectric FET (FEFET) in program operation using low-frequency noise (LFN) spectroscopy. Contrary to the previous report, LFN characteristics of FEFETs differ significantly depending on the program [low threshold voltage ( Vth)] or erase state [high Vth)] [Shin et al., IEEE Electron Device Lett. 43, 13 (2022)]. Furthermore, the 1/ f noise variation of the FEFETs is much larger in the program state than that in the erase state. It is revealed that the change in the number of electrons trapped at the FE/dielectric interface and oxygen vacancy in each progr

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25

Andreev, Alexey, Ondrej Sik, Lubomir Grmela, and Josef Sikula. "Ageing of Cadmium Telluride Radiation Detectors and its Diagnostics with Low Frequency Noise." Metrology and Measurement Systems 20, no. 3 (2013): 385–94. http://dx.doi.org/10.2478/mms-2013-0033.

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Abstract Samples of CdTe single crystals which are used as radiation detectors were periodically measured during a long time interval with different values of an applied voltage. The samples were also periodically exposed during long time periods to high temperatures of 390 K and to rapid changes of temperature from 300 K to 390 K. After 1.5 years of measurements we observed ageing of the samples which resulted in deterioration of their transport characteristics. The resistance of the samples increased significantly and current-voltage characteristics were unstable in time. Noise spectroscopy

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26

Manceau, Alain, Matthew Marcus, and Thomas Lenoir. "Estimating the number of pure chemical components in a mixture by X-ray absorption spectroscopy." Journal of Synchrotron Radiation 21, no. 5 (2014): 1140–47. http://dx.doi.org/10.1107/s1600577514013526.

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Principal component analysis (PCA) is a multivariate data analysis approach commonly used in X-ray absorption spectroscopy to estimate the number of pure compounds in multicomponent mixtures. This approach seeks to describe a large number of multicomponent spectra as weighted sums of a smaller number of component spectra. These component spectra are in turn considered to be linear combinations of the spectra from the actual species present in the system from which the experimental spectra were taken. The dimension of the experimental dataset is given by the number of meaningful abstract compon

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27

Zeng, X., and D. L. Boïko. "1/f noise in external-cavity InGaN diode laser at 420 nm wavelength for atomic spectroscopy." Optics Letters 39, no. 6 (2014): 1685. http://dx.doi.org/10.1364/ol.39.001685.

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28

Hoornweg, Gerard Ph, Tjipke De Beer, Nel H. Velthorst, and Cees Gooijer. "Forward Degenerate Four-Wave Mixing as a Detection Method in Liquid Separation Systems: Improving Detection Limits by Means of a Fabry—Perot Interferometer." Applied Spectroscopy 51, no. 7 (1997): 1008–11. http://dx.doi.org/10.1366/0003702971941395.

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A simple, small, and low-resolution confocal Fabry–Perot interferometer (CFP) has been developed to improve the signal-to-noise ratio (S/N) in forward degenerate four-wave mixing (F-D4WM) detection, coupled to high-performance liquid chromatography (HPLC). Its appropriateness is based on the difference in coherence between the F-D4WM signal and the background stray light. A detailed description of the specially designed CFP and its performance is presented. The improvement in S/N was calculated from the chromatographic peaks recorded after an HPLC separation of 1- and 2-aminoanthraquinone. The

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29

Kaminaka, Shoji, and Richard A. Mathies. "High-Throughput Large-Aperture Prism Prefilter for Ultraviolet Resonance Raman Spectroscopy." Applied Spectroscopy 52, no. 3 (1998): 469–73. http://dx.doi.org/10.1366/0003702981943707.

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For the acquisition of high-quality ultraviolet resonance Raman spectra of strongly scattering samples such as membrane protein suspensions, an f/3.5 Littrow prism prefilter has been designed, built, and characterized. This prefilter has a Czerny–Turner configuration, and its focal length is 25 cm. The apex angle of the dispersive prism (20°) was chosen to provide maximum performance in the 220 to 240 nm range. The prism prefilter significantly reduced stray background due to Rayleigh scattering and visible fluorescence, while maintaining a low dispersion of 1300 cm−1/mm at 253 nm as well as a

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30

Albert, Loïc, David Lafrenière, Doyon, René, et al. "The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope. III. Single Object Slitless Spectroscopy." Publications of the Astronomical Society of the Pacific 135, no. 1049 (2023): 075001. http://dx.doi.org/10.1088/1538-3873/acd7a3.

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Abstract The Near Infrared Imager and Slitless Spectrograph instrument (NIRISS) is the Canadian Space Agency contribution to the suite of four science instruments of the James Webb Space Telescope. As one of the three NIRISS observing modes, the Single Object Slitless Spectroscopy (SOSS) mode is tailor-made to undertake time-series observations of exoplanets to perform transit spectroscopy. The SOSS permits observing point sources between 0.6 and 2.8 μm at a resolving power of 650 at 1.25 μm using a slitless cross-dispersing grism while its defocussing cylindrical lens enables observing target

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31

Gebran, M., and R. Monier. "Microturbulent velocities and abundances for A and F dwarfs in open clusters." Proceedings of the International Astronomical Union 2, S239 (2006): 160–62. http://dx.doi.org/10.1017/s1743921307000348.

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AbstractThe current status of microturbulent velocity and abundance determinations for A and F dwarfs in open clusters is reviewed. A programme to observe several tens of A and F dwarfs in open clusters of various ages was initiated several years ago. We have performed high resolution high signal-to-noise spectroscopy of stars well distributed in mass along the Main Sequence. Microturbulent velocities and abundances of several chemical elements have been derived iteratively by fitting grids of synthetic spectra calculated in LTE to the observed spectra. Curve of growths were used in a few inst

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32

Rustamkulov, Zafar, David K. Sing, Rongrong Liu, and Ashley Wang. "Analysis of a JWST NIRSpec Lab Time Series: Characterizing Systematics, Recovering Exoplanet Transit Spectroscopy, and Constraining a Noise Floor." Astrophysical Journal Letters 928, no. 1 (2022): L7. http://dx.doi.org/10.3847/2041-8213/ac5b6f.

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Abstract The James Webb Space Telescope’s (JWST) NIRSpec instrument will unveil the nature of exoplanet atmospheres across the wealth of planet types, from temperate terrestrial worlds to ultrahot Jupiters. In particular, the 0.6–5.3 μm PRISM mode is especially well suited for efficient spectroscopic exoplanet observations spanning a number of important spectral features. We analyze a lab-measured NIRSpec PRISM mode Bright Object Time Series observation from the perspective of a JWST user to understand the instrument performance and detector properties. We create two realistic transiting exopl

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33

Pixley, Nathan C., Tiffany L. Correll, D. Pappas, Benjamin W. Smith, and James D. Winefordner. "Sub-Doppler Spectral Resolution and Improved Sensitivity in a Cesium Resonance Fluorescence Imaging Monochromator." Applied Spectroscopy 56, no. 6 (2002): 677–81. http://dx.doi.org/10.1366/000370202760076910.

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Improvements in spectral resolution and sensitivity of a cesium based resonance fluorescence imaging monochromator (RFIM) are described. Alignment of the two lasers used in the excitation scheme in a co-propagating geometry have resulted in a detector spectral bandpass (270 MHz) that is narrower than the Doppler broadened profile (380 MHz) of cesium vapor at room temperature. Improvements in the experimental design, namely the addition of an image intensifier and cooled charge-coupled device (CCD) camera, have resulted in increased sensitivity; we report a limit of detection of 108 photons per

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34

Eliseyev, I. A., A. S. Usikov, S. P. Lebedev, et al. "Investigation of electrolysis-related modification of graphene films in biosensors." Journal of Physics: Conference Series 2103, no. 1 (2021): 012103. http://dx.doi.org/10.1088/1742-6596/2103/1/012103.

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Abstract In this work, the modification of the surface parameters of graphene chips after electrolysis treatment in a NaClO4 aqueous solution has been studied. Two electrolysis modes have been analysed. In the first one, a negative potential (-0.2 V) is applied to the graphene chips, while in the second one the potential is positive (0.8 V). Investigation using a number of techniques including atomic force microscopy, Kelvin probe force microscopy, Raman spectroscopy, measurements of current-voltage characteristics and low-frequency noise has shown that the electrolysis mode with application o

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35

Iwanczyk, Jan S., Bradley E. Part, Carolyn R. Tull, and Shaul Barkan. "High-Throughput, Large Area Silicon X-Ray Detectors for High-Resolution Spectroscopy Applications." Microscopy and Microanalysis 7, S2 (2001): 1052–53. http://dx.doi.org/10.1017/s1431927600031330.

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The concept utilized in charge coupled devices (CCD’s) for detection and imaging of light signals involving lateral movement of charges and extremely low capacitance of the detector and readout electronics has spawned a variety of new ideas in the design of nuclear detectors. Initially, silicon drift detectors (SDD’s) were developed for high energy physics applications. More recently, a vigorous effort to develop new structures for x-ray spectroscopy and light detection has started. Drift structures have been designed in a variety of topologies and materials (such as Si, CdZnTe, and HgI2) to s

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Cogliati, Sergio, Marco Celesti, Ilaria Cesana, et al. "A Spectral Fitting Algorithm to Retrieve the Fluorescence Spectrum from Canopy Radiance." Remote Sensing 11, no. 16 (2019): 1840. http://dx.doi.org/10.3390/rs11161840.

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Retrieval of Sun-Induced Chlorophyll Fluorescence (F) spectrum is one of the challenging perspectives for further advancing F studies towards a better characterization of vegetation structure and functioning. In this study, a simplified Spectral Fitting retrieval algorithm suitable for retrieving the F spectrum with a limited number of parameters is proposed (two parameters for F). The novel algorithm is developed and tested on a set of radiative transfer simulations obtained by coupling SCOPE and MODTRAN5 codes, considering different chlorophyll content, leaf area index and noise levels to pr

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Sun, Jiaxin, Avinash Kumar Thakur, and Liviu Movileanu. "Protein Ligand-Induced Amplification in the 1/f Noise of a Protein-Selective Nanopore." Langmuir 36, no. 50 (2020): 15247–57. http://dx.doi.org/10.1021/acs.langmuir.0c02498.

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Rao, Bing-Jie, Pan Zhang, Ming-Kun Ling, et al. "Multi-branch erbium fiber-based femtosecond optical frequency comb for measurement of cavity ring-down spectroscopy." Acta Physica Sinica 71, no. 8 (2022): 084203. http://dx.doi.org/10.7498/aps.71.20212162.

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<sec>In this paper, we demonstrate an optical frequency comb (OFC) based on an erbium-doped-fiber femtosecond laser, for the measurement of cavity ring-down spectroscopy (CRDS) with wavelengths of 1064, 1083, 1240, 1380, 1500, 1600, 1750 and 2100 nm. We adopt a multi-branch structure to produce high power at the specific wavelengths to meet the requirement for application in the spectral measurement. The OFC is developed by using a mode-locked fiber ring laser based on the nonlinear amplifying loop mirror mechanism. The laser is self-starting by introducing a nonreciprocal phase bias in

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Zhou, Yueting, Jianxin Liu, Songjie Guo, et al. "Laser frequency stabilization based on a universal sub-Doppler NICE-OHMS instrumentation for the potential application in atmospheric lidar." Atmospheric Measurement Techniques 12, no. 3 (2019): 1807–14. http://dx.doi.org/10.5194/amt-12-1807-2019.

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Abstract. Lidar is an effective tool for high-altitude atmospheric measurement in which a weak absorption line for the target gas is selected to ensure a large optical depth. The laser frequency stabilization to the line center is required, and a sub-Doppler (sD) spectroscopy of the target line is preferred as a frequency reference. In this paper, a novel universal sD noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) instrumentation based on a fiber-coupled optical single-sideband electro-optic modulator (f-SSM) for the potential application in atmospheric lida

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Sterczewski, Lukasz Antoni, Jonas Westberg, and Gerard Wysocki. "Tuning properties of mid-infrared Fabry-Pérot quantum cascade lasers for multiheterodyne spectroscopy." Photonics Letters of Poland 8, no. 4 (2016): 113. http://dx.doi.org/10.4302/plp.2016.4.08.

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Injection current tuning properties of an 8.5 um Fabry-Pérot mid-infrared quantum cascade laser are evaluated by analyzing the mode-by-mode frequency tuning behavior with an identification of high-noise regimes in a delayed self-heterodyne experiment. We find that modes on the edges of the spectral envelope exhibit anomalous tuning coefficients compared to those in the center. Furthermore, the frequencies of individual modes are susceptible to parasitic etalons, likely causing laser frequency pulling. Despite the complicated tuning behavior, low phase-noise operating regimes exist, and are com

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Zhang, Zi-Yin, Yun-Sheng Deng, Hai-Bing Tian, Han Yan, Hong-Liang Cui, and De-Qiang Wang. "Noise Analysis of Monolayer Graphene Nanopores." International Journal of Molecular Sciences 19, no. 9 (2018): 2639. http://dx.doi.org/10.3390/ijms19092639.

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Graphene-based nanopore devices have shown tantalizing potential in single molecule detection for their monoatomic membrane thickness which is roughly equal to the gap between nucleobases. However, high noise level hampers applications of graphene nanopore sensors, especially at low frequencies. In this article, we report on a study of the contribution of suspended graphene area to noise level in full frequency band. Monolayer graphene films are transferred onto SiNx substrates preset with holes in varied diameters and formed self-supported films. After that, the films are perforated with smal

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Kaminaka, Shoji, and Teizo Kitagawa. "A Novel Idea for Practical UV Resonance Raman Measurement with a Double Monochromator and its Application to Protein Structural Studies." Applied Spectroscopy 46, no. 12 (1992): 1804–8. http://dx.doi.org/10.1366/0003702924123485.

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A practical system for UV resonance Raman (RR) measurements based on the combined use of the first-/second-order dispersions of two gratings in an ordinary double monochromator is proposed. This system rejects visible stray light completely and gives four times larger throughput than the combination of the normal second-order dispersion of two gratings and a visible-cut filter. Newly designed f/1.1 Cassegrainian mirror optics and a sensitive spinning cell using an ESR sample tube are combined with this spectrometer and applied to measurements of UV RR spectra of hen egg white lysozyme. The con

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Li, Chuanliang, Ligang Shao, Lijun Jiang, Xuanbing Qiu, Jilin Wei та Weiguang Ma. "Simultaneous Measurements of CO and CO2 Employing Wavelength Modulation Spectroscopy Using a Signal Averaging Technique at 1.578 μm". Applied Spectroscopy 72, № 9 (2018): 1380–87. http://dx.doi.org/10.1177/0003702818766904.

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A resolved line pair was selected for simultaneous measurement of carbon monoxide (CO) and carbon dioxide (CO2) in the near-infrared (NIR) region. The spectral lines of CO and CO2 at 1.578 µm were measured by wavelength modulation spectroscopy (WMS)-2 f and the absorption was enhanced with a multipass absorption cell. The white noise was further reduced by averaging technology. The detection sensitivity (1σ) for the system is estimated at 2.63 × 10−7 cm−1 for direct absorption spectroscopy. The ultimate detection limits of CO2 and CO mixed with pure N2 at 75 Torr are 29 parts per million (ppm)

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Chang, Kuan-Chang, Tianjiao Dai, Zhengda Wang, Zhangwei Huang, Xinnan Lin, and Lei Li. "The observation of Gaussian distribution and origination identification of deep defects in AlGaN/GaN MIS-HEMT." Applied Physics Letters 120, no. 17 (2022): 172107. http://dx.doi.org/10.1063/5.0088928.

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This paper proposes a math-physical correlative method that monitors deep defect response by electrical measurement and calculates the state density by designed mathematical processing. The extracted Gaussian distribution of deep defects was discussed according to the theoretical model for the density of states. The accuracy of this method was also verified through 1/f low frequency noise analysis. The origination of deep defects was investigated by transmission electron microscope, x-ray photoelectron spectroscopy, and photoluminescence analysis, and a molecular model was constructed. Therefo

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Chang, Kuan-Chang, Tianjiao Dai, Zhengda Wang, Zhangwei Huang, Xinnan Lin, and Lei Li. "The observation of Gaussian distribution and origination identification of deep defects in AlGaN/GaN MIS-HEMT." Applied Physics Letters 120, no. 17 (2022): 172107. http://dx.doi.org/10.1063/5.0088928.

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This paper proposes a math-physical correlative method that monitors deep defect response by electrical measurement and calculates the state density by designed mathematical processing. The extracted Gaussian distribution of deep defects was discussed according to the theoretical model for the density of states. The accuracy of this method was also verified through 1/f low frequency noise analysis. The origination of deep defects was investigated by transmission electron microscope, x-ray photoelectron spectroscopy, and photoluminescence analysis, and a molecular model was constructed. Therefo

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Stadler, Adam Witold, Andrzej Kolek, Krzysztof Mleczko, Zbigniew Zawiślak, Andrzej Dziedzic, and Wojciech Stęplewski. "Noise sources in polymer thick-film resistors." Soldering & Surface Mount Technology 27, no. 3 (2015): 115–19. http://dx.doi.org/10.1108/ssmt-04-2015-0014.

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Purpose – The paper aims to get the knowledge about electrical properties, including noise, of modern polymer thick-film resistors (TFRs) in a wide range of temperature values, i.e. from 77 K up to room temperature. The sample resistors have been made of different combinations of resistive compositions, either ED7100 or MINICO (M2013, M2010), and conducting pastes (for contacts) Cu- or Au-based, deposited on FR-4 laminate. Design/methodology/approach – The paper opted for an experimental study using either current noise index measurement in room temperature for large batch of samples or noise

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Tran, Chieu D., and Ricardo J. Furlan. "Indirect Amplitude Stabilization of a Tunable Laser through Control of the Intensity of a Pump Laser by an Electro-Optic Modulator." Applied Spectroscopy 47, no. 2 (1993): 235–38. http://dx.doi.org/10.1366/0003702934048172.

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A novel method has been developed to stabilize the intensity of a tunable laser. In this method, the tunable laser is amplitude-stabilized indirectly by controlling the intensity of the pump laser through an electro-optic modulator placed between the pump and the tunable lasers. A small portion of the tunable laser beam was split into a reference photodiode to provide a reference signal for the feedback driver to drive the Pockels cell. Any fluctuation in the intensity of the tunable laser is compensated for by varying the intensity of the pump laser through the feedback driven Pockels cell. R

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Barnes, Charles C., Kathleen T. Yee, and Douglas E. Vetter. "Conditional Ablation of Glucocorticoid and Mineralocorticoid Receptors from Cochlear Supporting Cells Reveals Their Differential Roles for Hearing Sensitivity and Dynamics of Recovery from Noise-Induced Hearing Loss." International Journal of Molecular Sciences 24, no. 4 (2023): 3320. http://dx.doi.org/10.3390/ijms24043320.

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Endogenous glucocorticoids (GC) are known to modulate basic elements of cochlear physiology. These include both noise-induced injury and circadian rhythms. While GC signaling in the cochlea can directly influence auditory transduction via actions on hair cells and spiral ganglion neurons, evidence also indicates that GC signaling exerts effects via tissue homeostatic processes that can include effects on cochlear immunomodulation. GCs act at both the glucocorticoid receptor (GR) and the mineralocorticoid receptor (MR). Most cell types in the cochlea express both receptors sensitive to GCs. The

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Waldron, Abigail, Ashley Allen, Arelis Colón, J. Chance Carter, and S. Michael Angel. "A Monolithic Spatial Heterodyne Raman Spectrometer: Initial Tests." Applied Spectroscopy 75, no. 1 (2020): 57–69. http://dx.doi.org/10.1177/0003702820936643.

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A monolithic spatial heterodyne Raman spectrometer (mSHRS) is described, where the optical components of the spectrometer are bonded to make a small, stable, one-piece structure. This builds on previous work, where we described bench top spatial heterodyne Raman spectrometers (SHRS), developed for planetary spacecraft and rovers. The SHRS is based on a fixed grating spatial heterodyne spectrometer (SHS) that offers high spectral resolution and high light throughput in a small footprint. The resolution of the SHS is not dependent on a slit, and high resolution can be realized without using long

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Steele, A. W., and G. M. Hieftje. "A Modulated Sample Introduction System for Atomic Emission Spectrometry." Applied Spectroscopy 40, no. 3 (1986): 357–63. http://dx.doi.org/10.1366/0003702864509240.

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A modulated sample-introduction device for use in flame emission spectrometry has been constructed and evaluated. With this device, the flow of aerosol to the excitation source is modulated by the application, at a specific frequency, of a pressure pulse to the nebulizer chamber; the use of frequency-selective detection then permits efficient signal recovery. If source background remains at a constant level, it is not detected and the signal-to-background ratio (S/B) is consequently improved. Because the technique provides a decrease in the instrument 1/f and flame-background flicker noise, de

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