title: Laser absorption spectrometer using frequency chirped intensity modulation at 1.57 μm wavelength for CO2 measurement.
abstract: We have demonstrated the laser-absorption spectrometer system using frequency chirped intensity modulation at 1.57 μm wavelength for measurement of CO(2) concentration. Using this technique, backscattered laser radiation from different ranges can be discriminated in the frequency domain of the electrical signal. We have reported the discrimination of two signals from the targets with different ranges. It is shown that stable measurements with short time fluctuation corresponding to 4 ppm (rms) were obtained with 32 s measurement intervals. Furthermore, there is qualitative good agreement on, at least, the diurnal changes between the results of the laser absorption spectrometer system and the in-situCO(2) sensor.
authors: Information Technology R&D Center, Mitsubishi Electric Corporation, 5-1-1 Ofuna, Kamakura 247-8501, Japan. Imaki.Masaharu@dc.MitsubishiElectric.co.jp
authors: Masaharu
authors: M
authors: Imaki
authors: Shumpei
authors: S
authors: Kameyama
authors: Yoshihito
authors: Y
authors: Hirano
authors: Shinichi
authors: S
authors: Ueno
authors: Daisuke
authors: D
authors: Sakaizawa
authors: Shuji
authors: S
authors: Kawakami
authors: Masakatsu
authors: M
authors: Nakajima