レーザーセンシング学会誌 (ISSN 2436-6239)
Journal of Laser Radar Society of Japan (ISSN 2436-6239)
Volume 2, Number 2 (October 2021)
解説: 吸収分光法を利用した微量ガス計測 pp. 67-74|
Technical Review: Application of absorption spectroscopy for trace gas measurement
Optical spectroscopy based on photo absorption becomes a powerful tool in atmospheric environmental monitoring and the industrial field. The strength of the permeated light is related to the absorber concen- tration according to Lambert-Beerʼs law. There are several methods which uses the principle of absorp- tion phenomena in the wavelength range from vacuum ultraviolet to mid-infrared region. These include non dispersive infrared(NDIR), differential optical absorption spectroscopy(DOAS), cavity ring-down spectroscopy(CRDS), Fourier transform infrared spectrometer(FTIR), integrated path differential absorption lidar(IPDA-lidar), laser differential absorption spectrometer(LAS), and differential absorp- tion lidar(DIAL). This review reports on the basics of these commonly used measurement techniques.