Academic literature on the topic 'Near-IR narrow band spectroscopy'

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Journal articles on the topic "Near-IR narrow band spectroscopy"

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Wetzel, David L. "Sensitive IR narrow band optimized microspectrometer." Vibrational Spectroscopy 29, no. 1-2 (July 2002): 183–89. http://dx.doi.org/10.1016/s0924-2031(01)00206-5.

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Arrieta, A., and S. Torres-Peimbert. "Near-IR imaging and optical Spectroscopy of M 2-9." Symposium - International Astronomical Union 180 (1997): 342. http://dx.doi.org/10.1017/s0074180900131195.

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IR OBSERVATIONS. We have extended previous infrared imaging studies (cf. Hora & Latter 1994 ApJ 437, 281; Kastner et al. 1996 ApJ 462, 777) through wide and narrow band filters.In these images: (a) JHK′ morphology is similar to the optical structure. The knots are brighter at the shorter wavelengths, while the core is brighter at K′. (b) [He I] 1.083 μm that traces the highly ionized region, is concentrated along the axial region and extends throughout the lobes (33″ × 9″). It shows the knots very prominently. (c) [Fe II] 1.644 μm, that traces the shock excited regions, extends []throughout the lobes; it is more prominent in the northern knot and it is very strong in the core. (d) The excited molecular H2 lines are concentrated on a wide ‘torus’ in the equatorial plane. This geometry is similar to that exhibited by most bipolar planetary nebulae where H2 has been detected (e.g., Kastner et al. 1996). No H2 emission is seen in the core. (e) Paγ shows emission in only in the core and the northern knot. (f) Brγ shows emission in the core and in knots N2, S2 and S3. (g) No significant emission in CO was obtained.
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Manchado, A., F. Prada, L. Stanghellini, and N. Panagia. "Sub-arcsecond near-IR imaging and long-slit spectroscopy of NGC 7027." Symposium - International Astronomical Union 180 (1997): 256. http://dx.doi.org/10.1017/s0074180900130748.

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We report sub-arcsecond narrow band imaging in the lines of H2 2.1218 μm, Brγ 2.16 μm, [Fe II] 1.664 μm of the Planetary Nebulae NGC 7027. Data were obtained at the 3.5 m telescope at Calar Alto Observatory (Spain), using MAGIC. A false color image was produced by combining these three narrow band images. Thus, and due to extraordinary seeing (0″.6 arcsecond) conditions, allow us to reveal the morphology of the excited molecular and ionized gas. The Brγ and the [Fe II] images allowed us to study the structure of the ionized gas at slightly different excitation levels, according to the ionization potentials of the ions involved in the corresponding transitions (13.6 eV to ionize hydrogen, versus 17.4 eV for iron ionizaton). Since NGC 7027 is a high excitation nebula, the iron is readily double– ionized in the hotter regions, thus what we really see in the [Fe II] image is the low–intermediate excitation zones. By studying the [Fe II] and Brγ images together we infer that: the (non–reddened) low–ionization gas morphology consists of a regular, smooth ring reminder of a projected cylindrical structure. In addition to a brightness level that is at least thirty times the brightness of the maximum [Fe II] emission, the ionized hydrogen image exhibit a strong brightness gradient between the mentioned ring and the outer regions, and the emission is comparatively negligible outside the ring–like feature of about 12 × 10 arcsec (the measures refer to the major and minor axes of the ellipse–like shape). The [Fe II] morphology is less so ring–like and regular, and it seems to indicate smaller scale structure, such as clumps and filaments, at the resolution scale–level. The dishomogeneity in the [Fe II] emission could be ascribed to gradients in the elemental distribution, as well (and more probably so) as to the plasma temperature and density inhomogeneities. The H2 molecular image completely embeds the ionized gas zones, up to a size of about 16 × 11 arcsec. The smaller size refers here to the waist of the markedly bipolar shape, similar to a projected peanut; the larger size is the dimension of the two main lobes. The highest brightness through the molecular filters corresponds to the inner ring, slightly less extended than the ionized one, and to an outer envelope that is not seen in the ionized gas, and has a maximum diagonal extension of about 24 arcsec. Spatially resolved low resolution spectra (R 200) were obtained in the H and K band.
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Ozaki, Yukihiro, Yongliang Liu, and Isao Noda. "Two-Dimensional Infrared and Near-Infrared Correlation Spectroscopy: Applications to Studies of Temperature-Dependent Spectral Variations of Self-Associated Molecules." Applied Spectroscopy 51, no. 4 (April 1997): 526–35. http://dx.doi.org/10.1366/0003702971940521.

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This paper demonstrates the potential of generalized two-dimensional (2D) Fourier transform (FT) infrared (IR) and near-infrared (NIR) correlation spectroscopy in the studies of temperature-dependent spectral variations of self-associated molecules. Three examples of the 2D correlation analysis are discussed in this paper. The first two are concerned with the temperature-dependent IR and NIR spectral changes of N-methylacetamide (NMA) in the pure liquid state. The 2D IR correlation approach revealed that almost all the peaks of NMA in the 3400–1100-cm−1 region consist of two to four separate bands. For example, the amide I band contains contributions from at least four distinct bands at 1685, 1665, 1650, and 1635 cm−1. The analysis of the asynchronous 2D IR spectrum in the amide I region showed that the sequence of spectral intensity change in the ascending order of temperature was given by 1635<1650<1665<1685 cm−1. These bands at 1635, 1650, 1665, and 1685 cm−1 were assigned to the amide I modes of chain oligomers of various sizes and dimer of NMA; the longer the chain, the lower the frequency. The closeup view of 2D NIR correlation spectra of NMA obtained at narrow spectral and temperature windows enabled us to propose not only band assignments in the 6800–6050-cm−1 region but also a detailed mechanistic picture of the thermally induced dissociation of NMA for each temperature range. We also applied the generalized 2D correlation approach to the analysis of a set of FT NIR spectra of oleyl alcohol under temperature variations. The 2D NIR analysis enhanced the spectral resolution and simplified the spectra with overlapped bands. For example, it was found that a band at 7090 cm−1 arising from the first overtone of an OH stretching mode of the monomeric alcohol consists of two bands due to the rotational isomerism of the free OH group. An intriguing possibility of correlating various overtone and fundamental bands to establish unambiguous assignments was also suggested from the 2D NIR study on oleyl alcohol.
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Marin, F., J. Le Cam, E. Lopez-Rodriguez, M. Kolehmainen, B. L. Babler, and M. R. Meade. "The polarized spectral energy distribution of NGC 4151." Monthly Notices of the Royal Astronomical Society 496, no. 1 (June 3, 2020): 215–22. http://dx.doi.org/10.1093/mnras/staa1533.

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ABSTRACT NGC 4151 is among the most well-studied Seyfert galaxies that does not suffer from strong obscuration along the observer’s line of sight. This allows to probe the central active galactic nucleus (AGN) engine with photometry, spectroscopy, reverberation mapping, or interferometry. Yet, the broad-band polarization from NGC 4151 has been poorly examined in the past despite the fact that polarimetry gives us a much cleaner view of the AGN physics than photometry or spectroscopy alone. In this paper, we compile the 0.15–89.0 μm total and polarized fluxes of NGC 4151 from archival and new data in order to examine the physical processes at work in the heart of this AGN. We demonstrate that, from the optical to the near-infrared (IR) band, the polarized spectrum of NGC 4151 shows a much bluer power-law spectral index than that of the total flux, corroborating the presence of an optically thick, locally heated accretion flow, at least in its near-IR emitting radii. Specific signatures from the atmosphere of the accretion structure are tentatively found at the shortest ultraviolet (UV) wavelengths, before the onset of absorption opacity. Otherwise, dust scattering appears to be the dominant contributor from the near-UV to near-IR polarized spectrum, superimposed on to a weaker electron component. We also identify a change in the polarization processes from the near-IR to the mid-IR, most likely associated with the transition from Mie scattering to dichroic absorption from aligned dust grains in the dusty torus or narrow-line region. Finally, we present and discuss the very first far-infrared polarization measurement of NGC 4151 at 89 μm.
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Gadedjisso-Tossou, Komlan S., Lyubomir I. Stoychev, Messanh A. Mohou, Humberto Cabrera, Joseph Niemela, Miltcho B. Danailov, and Andrea Vacchi. "Cavity Ring-Down Spectroscopy for Molecular Trace Gas Detection Using A Pulsed DFB QCL Emitting at 6.8 µm." Photonics 7, no. 3 (September 14, 2020): 74. http://dx.doi.org/10.3390/photonics7030074.

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A trace gas sensor based on pulsed cavity ring-down spectroscopy (CRDS) was developed for measurement of the ν4 fundamental vibrational band of ammonia (NH3) centered at 1468.898 cm−1. A pulsed distributed feedback quantum cascade laser (DFB-QCL) operating at 6.8 µm (1470.58 cm−1) quite well covered the absorption band of the ammonia and strong fundamental vibrational absorption bands of different molecular gases in this unexplored region. The cavity was partially evacuated down to 0.4 Atm by a turbo-molecular pump to reduce the partial interference between the NH3 spectra and water near the absorption peak of ammonia. A sensitivity of nine parts per billion was reached for a measurement time of 120 s as well as an optical path length of 226 m. The device demonstrated high spectral performance and versatility due to its wide tuning range, narrow linewidth, and comparatively high-energy mid-IR radiation in the relatively unexplored 6.8 µm region, which is very important for high-resolution spectroscopy of a variety of gases.
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Zinchenko, Viktor, Oleg Ieriomin, Valerii Antonovich, Nataliia Chivireva, Iryna Stoianova, Ganna Volchak, and Pavlo Doga. "SPECTROSCOPIC PROPERTIES OF SOLIDIFIED MELTS OF THE EuF3-CeF3-NaCl-KCl SYSTEM." Ukrainian Chemistry Journal 86, no. 10 (November 16, 2020): 120–28. http://dx.doi.org/10.33609/2708-129x.86.10.2020.120-128.

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The nature of the interaction in the EuF3-CeF3 system in the process of high-temperature (1050 °C) oxidation - reduction reaction was established by the methods of IR transmission spectroscopy, diffuse reflection spectroscopy and fluorescence spectroscopy. Here is a significant bathochromic shift to 480-485 nm band of blue luminescence of Eu(II) - containing phases, due to the 5d–4f electronic transitions, as well as the manifestation of orange-red luminescence of Eu(III) - containing phases due to 4f–4f electronic transitions in the range of 590–690 nm. There is a bathochromic shift of the IR bandwidth in the spectrum of the solidified salt melt as a result of dissolution of the fluoride system. Diffuse reflection spectra reveal changes in the composition of the phases that dissolve in the salt melt due to exchange reactions. The wide absorption band in the UV range gives way to a negative absorption band consisting of two peaks due to luminescence. The almost complete disappearance of the band of 4f–4f transitions in Eu(III) in the near-IR range of the spectrum is evidence of its entire reduction in the chloride melt to Eu(II). The character of the luminescence spectra of solidified salt melts also changes in comparison with the initial sample of the EuF3-CeF3 system, namely, the luminescence band of Ce3+ ions disappears, and the luminescence band of Eu2+ ions at 430–440 nm becomes narrow and highly intensive. The luminescence band of Eu3+ ions in the orange-red region of the spectrum disappears completely. Thus, Eu2+ ions become dominant in the formation of the spectral picture of the solidified salt melt, which is evidence of the completion of the redox process in the system.
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Tapia, Mauricio, Paolo Persi, Miguel Roth, and Davide Elia. "An infrared study of the high-mass, multistage star-forming region IRAS 12272−6240." Monthly Notices of the Royal Astronomical Society 496, no. 3 (June 20, 2020): 3358–70. http://dx.doi.org/10.1093/mnras/staa1772.

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ABSTRACT IRAS 12272−6240 is a complex star-forming region with a compact massive dense clump (DC) and several associated masers, located at a well-determined distance of d = 9.3 kpc from the Sun. For this study, we obtained sub-arcsec broad- and narrow-band near-infrared (near-IR) imaging and low-resolution spectroscopy with the Baade/Magellan telescope and its camera PANIC. Mosaics of size 2 × 2 arcmin2 in the JHKs bands and with narrow-band filters centred in the 2.12 μm H2 and 2.17 μm Br γ lines were analysed in combination with Hi-GAL/Herschel and archive IRAC/Spitzer and WISE observations. We found that the compact DC houses two Class I young stellar objects (YSOs) that probably form a 21000 -au-wide binary system. Its combined 1–1200 μm spectral energy distribution is consistent with an O9V central star with a $10^{-2} \, \mathrm{M}_\odot$ disc and a $1.3 \times 10^4 \, \mathrm{M}_\odot$ dust envelope. Its total luminosity is $8.5 \times 10^4 \, \mathrm{L}_\odot$. A series of shocked H2 emission knots are found in its close vicinity, confirming the presence of outflows. IRAS 12272−6240 is at the centre of an embedded cluster with a mean age of 1 Myr and 2.6 pc in size that contains more than 150 stars. At its nucleus, we found a more compact and considerably younger subcluster containing the YSOs. We also identified and classified the O-type central stars of two dusty radio/IR H ii regions flanking the protostars. Our results confirm that these elements form a single giant young complex where massive star formation processes started some 1 Myr ago and are still active.
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Kalasinsky, V. F., K. G. Whitehead, R. C. Kenton, and K. S. Kalasinsky. "Double Lightpipe System for Analytical GC/FT-IR and Spectral Libraries." Applied Spectroscopy 42, no. 1 (January 1988): 56–60. http://dx.doi.org/10.1366/0003702884428419.

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A GC/FT-IR accessory has been configured with two lightpipes in order to allow flexibility in chromatographic separations. A capillary column is connected to a 15-cm lightpipe (1.5-mm bore) and is used for analytical GC/FT-IR. The second lightpipe (42-cm, 3-mm bore) is connected to a packed column and is configured with valves to provide a stopped-flow capability. This lightpipe is used when the sample size is not limited or when signal-averaging and high resolution are necessary. Broad-band MCT detectors are generally used because they are not adversely affected by unmodulated blackbody radiation from the heated lightpipe. In those instances when a narrow-band MCT detector is needed, an aperture and one additional mirror are used to discriminate against the unmodulated radiation. Applications of both systems are discussed.
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Mengel, Sabine, Matthew D. Lehnert, Niranjan Thatte, and Reinhard Genzel. "IFS and IR Observations of Star Clusters in the Antennae." Symposium - International Astronomical Union 207 (2002): 378–82. http://dx.doi.org/10.1017/s007418090022408x.

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Over the past decade, it has become clear that interaction induced formation of compact young star clusters is a ubiquitous pheonomenon, and the understanding of this process is thought to also shed light on galaxy evolution in general, because these young clusters are widely believed to be the progenitors of a part of the globular cluster systems seen in local elliptical galaxies. We have observed the prototypical merger NGC 4038/4039 using near-infrared broad- and narrow band imaging, integral field spectroscopy and medium and high resolution spectroscopy. We find that all of the bright star clusters are young (<20 Myrs), but the “overlap region” hosts the youngest clusters (∼5 Myrs), while the nuclear starbursts started ∼100 Myrs ago. Photometric and dynamical masses range from 105 to a few x106M⊙. However, mass-to-light ratios vary from cluster to cluster and suggest differences in the contribution of low-mass stars. While clusters with a deficiency in low-mass stars are likely to evaporate before they are a Hubble time old, those with a high mass-to-light-ratio could represent young globulars.
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Dissertations / Theses on the topic "Near-IR narrow band spectroscopy"

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Bunker, Andrew John. "Searches for distant galaxies." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337592.

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Watson, Alexander M. "Fabrication of Micropolarizer and Narrow Band-Pass Pixel Filters for Focal Plane Array." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1324658152.

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Conference papers on the topic "Near-IR narrow band spectroscopy"

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Avrutin, Vitaliy, Ümit Özgür, Erdem Topsakal, Ryan Green, and Nibir K. Dhar. "Finite size narrow-band transmission filters for real-time short wave IR spectroscopy and imaging." In Image Sensing Technologies: Materials, Devices, Systems, and Applications V, edited by Nibir K. Dhar and Achyut K. Dutta. SPIE, 2018. http://dx.doi.org/10.1117/12.2304665.

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Ortega, Antonio, Gonzalo Paez, and Marija Strojnik. "Characterization of narrow-band near-IR diodes arranged in array patterns." In SPIE Optical Engineering + Applications, edited by Marija Strojnik and Gonzalo Paez. SPIE, 2011. http://dx.doi.org/10.1117/12.895997.

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Daunt, Stephen, Brant Billinghurst, Jean-Marie Flaud, Walter Lafferty, and Robert Grzywacz. "FIRST HIGH RESOLUTION IR SPECTRA OF 2-D1-PROPANE. THE ν9 (A1) B-TYPE BAND NEAR 367.2389 cm−1." In 73rd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2018. http://dx.doi.org/10.15278/isms.2018.wh10.

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Daunt, S. J., Brant Billinghurst, and Robert Grzywacz. "FIRST HIGH RESOLUTION IR STUDY OF THE ν14 (A') A-TYPE BAND NEAR 421.847 cm−1OF 2-13C-PROPENE." In 72nd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2017. http://dx.doi.org/10.15278/isms.2017.fa06.

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Daunt, S. J., Brant Billinghurst, Jean-Marie Flaud, Walter Lafferty, and Robert Grzywacz. "FIRST HIGH RESOLUTION IR SPECTRA OF 2-13C-PROPANE. THE ν9 B-TYPE BAND NEAR 366.767 cm−1AND THE ν26 C-TYPE BAND NEAR 746.615 cm−1. DETERMINATION OF GROUND AND UPPER STATE CONSTANTS." In 72nd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2017. http://dx.doi.org/10.15278/isms.2017.fa04.

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Daunt, S. J., Brant Billinghurst, Jean-Marie Flaud, Walter Lafferty, and Robert Grzywacz. "FIRST HIGH RESOLUTION IR SPECTRA OF 1-13C-PROPANE. THE ν9 B-TYPE BAND NEAR 366.404 cm−1AND THE ν26 C-TYPE BAND NEAR 748.470 cm−1. DETERMINATION OF GROUND AND UPPER STATE CONSTANTS." In 72nd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2017. http://dx.doi.org/10.15278/isms.2017.fa05.

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Gjuraj, Daniel, Brant Billinghurst, Jean-Marie Flaud, Walter Lafferty, Robert Grzywacz, and Stephen Daunt. "FIRST FAR-IR SPECTRA OF 2,2-D2-PROPANE: THE ν9 (A1) B-TYPE BAND NEAR 365.3508 cm−1. THE DETERMINATION OF GROUND AND UPPER STATE CONSTANTS." In 73rd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2018. http://dx.doi.org/10.15278/isms.2018.wh11.

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Gjuraj, Daniel, Brant Billinghurst, Jean-Marie Flaud, Walter Lafferty, Robert Grzywacz, and S. J. Daunt. "FIRST HIGH RESOLUTION IR SPECTRA OF 2,2-D2-PROPANE. THE ν15 (B1) A-TYPE BAND NEAR 954.709 cm−1. DETERMINATION OF GROUND AND UPPER STATE CONSTANTS." In 72nd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2017. http://dx.doi.org/10.15278/isms.2017.tk08.

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Brauckmann, Dennis, and Jens von Wolfersdorf. "Infrared Thermography With In-Situ Calibration Using Thermochromic Liquid Crystals Applied to Film Cooling." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53855.

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This paper presents an application of infrared thermography measurements on a film cooled flat surface using a single cylindrical film cooling hole. Infrared thermography (IR) is used to obtain the full field surface distribution of the temperature and therefore the film cooling effectiveness. For accurate results in-situ calibration of the infrared radiation intensity during the experiment needs to be performed, which is usually done using surface mounted thermocouples. For the near hole region thermochromic liquid crystals (TLC) are applied to obtain additional information for the calibration. A mixture of two narrow band TLCs is used, leading to discrete temperature lines on the surface. Using small variations in the test temperature settings, the TLC-lines can be located on the test surface into the regions of interest and the influence on the obtained infrared calibration results can be investigated. Experimental results for the film cooling effectiveness are presented for several blowing rates.
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Heigel, Jarred C., and Eric P. Whitenton. "The Effects of Integration Time and Size-of-Source on the Temperature Measurement of Segmented Chip Formation Using Infrared Thermography." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84319.

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This paper illustrates the errors due to integration time and size-of-source effects when measuring the temperature of segmented chip formation using infrared (IR) thermography. Segmented chip formation involves narrow periodic shear bands that experience rapid heating and move at high velocities and accelerations. As a result, the values of the measured temperatures depend strongly on the temporal and spatial measurement window used. In this study, an ideal infrared camera is simulated to understand the effects of integration time and size-of-source on the measurement. This analysis does not consider the temporal and spatial transfer functions of the camera system, thus simplifying the analysis to be applicable to all IR thermography users. Incorporating appropriate transfer functions would make the analysis specific to a given camera system. Finite element analysis (FEA) simulation results provide a reference cutting process which is manipulated to mimic motion blur and size-of-source effects. For this purpose, the FEA results adequately represent the cutting process with rapid heating and high chip velocities. For the studied cases, size-of-source has relatively little impact on the measurement results when compared to the effects of integration time. Results show integration times from 1 μs to 90 μs significantly affect the measurement results. The maximum temperature measured by the simulated IR camera decreases from an FEA maximum of 735 °C to 668 °C at 90 μs integration time. Integration time significantly affects temperature measurement in the periodic shear band but does not significantly affect the simulated measurement error of the chip temperature near the tool rake face.
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