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- W4229456184 abstract "Abstract Optical spectroscopy has a broad scientific basis in chemistry, physics, and material science, with diverse applications in medicine, pharmaceuticals, agriculture, and environmental monitoring. Fourier transform infrared (FTIR) spectrometers and tunable laser spectrometers (TLS) are key devices for measuring optical spectra. Superior performance in terms of sensitivity, selectivity, accuracy, and resolution is required for applications in gas sensing. This review deals with gas measurement based on either direct optical absorption spectroscopy or photoacoustic spectroscopy. Both approaches are applicable to FTIR spectroscopy or TLS. In photoacoustic spectroscopy, cantilever‐based photoacoustic spectroscopy is focused due its high performance. A literature survey is conducted revealing the recent technological advances. Theoretical fundamental detection limits are derived for TLS and FTIR, considering both direct absorption and photoacoustic spectroscopies. A theoretical comparison reveals which technology performs better. The minimum normalized absorption coefficient and normalized noise equivalent absorption coefficient appear as key parameters for this comparison. For TLS‐based systems, direct absorption spectroscopy is found to be the best for lower laser power and longer path length. For FTIR‐based systems, direct absorption is found to be the best for low temperature sources, higher spectrometer throughput, faster mirror velocity, and longer gas cells." @default.
- W4229456184 created "2022-05-11" @default.
- W4229456184 creator A5000784917 @default.
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- W4229456184 creator A5056838032 @default.
- W4229456184 creator A5064497792 @default.
- W4229456184 creator A5067559568 @default.
- W4229456184 date "2022-05-10" @default.
- W4229456184 modified "2023-10-14" @default.
- W4229456184 title "Direct Absorption and Photoacoustic Spectroscopy for Gas Sensing and Analysis: A Critical Review" @default.
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