Results 221 to 230 of about 65,160 (264)

Comparison of AC laser calorimeter measurements with FTIR measurements of superconductors

SPIE Proceedings, 2000
The temperature dependence of the absorption of the thick niobium films was measured using an AC far-infrared laser calorimeter. Moreover the temperature and frequency dependences of the absolute transmission and reflection of same thin niobium nitride films were measured from 5 to 20 K and from 10 to 200 cm-1 using a fourier transform infrared ...
Etsuo Kawate, Mitsuo Koguchi, Zhen Wang, Yoshinori Uzawa, Kohtaro Isida   +4 more
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A V-shaped spectroscopic cell for FTIR measurements

Chinese Chemical Letters, 2011
Abstract A V-shaped spacroscopic cell (V-cell) was constructed using two CaF2 optical plates for FTIR light transparent measurements in the range of 4000–1000 cm−1. The spectrum of ethanol was characterized with the standard spectra, excellent fitting was achieved with a bottom-width correction method.
Xiang Qin Lin, Zhi Xiang Zhang, Wan Qun Hu   +2 more
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A high-pressure spectroscopic cell for FTIR measurements

Journal of Physics E: Scientific Instruments, 1984
A high-pressure infrared spectroscopic cell is described for the in situ observation of chemical processes at pressures up to 100 MPa and temperatures in the range 293-523K. The cell may be used for the direct study of both homogeneous and heterogeneous catalysts.
R Whyman, K A Hunt, R W Page, S Rigby
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Resolution errors in FTIR absorbance measurements

Journal of Molecular Structure, 1984
Abstract Resolution errors occurring in the FTIR measurement of peak absorbances have been investigated experimentally in the 0.06 to 0.8 range of resolution parameter X up to peak absorbances of 1.7 for unapodized spectra and for triangular and Happ-Genzel apodization. A method has been found for the correction of resolution errors.
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ATR FTIR spectroscopy for in situ measurement of supersaturation

Journal of Crystal Growth, 1997
The current contribution establishes the technical feasibility of Attenuated Total Reflection (ATR) Fourier transform infrared (FTIR) spectroscopy for the in situ measurement of supersaturation in crystallization processes. The approach was inspired by recent advancements in ATR spectroscopy by way of various light transfer systems for remote sensing ...
Dilum D. Dunuwila, Kris A. Berglund
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Measuring Breath Alcohol Concentrations with an FTIR Spectrometer

Journal of Chemical Education, 2003
An FTIR spectrometer equipped with a long-path gas cell can be used to measure breath alcohol concentrations in an instrumental analysis laboratory course. Students use aqueous ethanol solutions to make a calibration curve that relates absorbance signals of breath samples with blood alcohol concentrations.
Adam Kneisel, Michael K. Bellamy
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A comparison of measured and calculated FTIR spectral radiance

Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium, 2002
Data from the ETL ground-based Fourier Transform Infrared Radiometer (FTIR) were taken during the FIRE II (Coffeyville, Kansas, 1991) and PROBE (Kavieng, Papua New Guinea, 1993) experiments. In this paper calibration problems encountered during the two experiments are discussed.
null Yong Han, J.H. Churnside, J.A. Shaw, E.R. Westwater   +3 more
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Remote FTIR Measurement of Volatile Organic Chemicals

Optical Remote Sensing of the Atmosphere, 1990
Longpath FTIR remote sensors have been used to make precise measurements of volatile organic chemicals in the vicinity of chemical plants and hazardous waste sites.
Orman A. Simpson, Robert H. Kagann, William F. Herget   +2 more
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FTIR measurements of acid‐gas–methyldiethanolamine systems

AIChE Journal, 1998
AbstractThe standard industrial process for the purification of natural gas is to remove acid gases, mainly hydrogen sulfide and carbon dioxide, by the absorption and reaction of these gases with alkanolamines, but the lack of reliable and accurate vapor–liquid equilibrium (VLB) data impedes the commercial application of more efficient alkanolamine ...
William J. Rogers, Jerry A. Bullin, Richard R. Davison   +2 more
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Measurement of Ice Fraction in NaCl Solution with FTIR

Chemistry Letters, 1992
Abstract Infrared spectra of 0.12 mm thick frozen NaCl solution from 1600 to 4000 cm−1 were obtained at sub-zero temperature with a FTIR spectrometer. The transmittance of the sample decreased sensitively with decreasing temperature around the frequency of 2700 cm−1.
Masaru Mizoguchi, Philip F Low
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