title: Development of 1.6 microm continuous-wave modulation hard-target differential absorption lidar system for CO2 sensing.
abstract: We have demonstrated the 1.6 mum cw modulation hard-target differential absorption lidar system for CO(2) sensing. In this system, ON and OFF wavelength laser lights are intensity modulated with cw signals. Received lights of the two wavelengths from the hard target are discriminated by modulation frequencies in the electrical signal domain. The optical circuit is fiber based, and this makes the system compact and reliable. It is shown that a stable CO(2) concentration measurement corresponding to a fluctuation of 4 ppm (rms) (ppm is parts per million) has been achieved in 32 s measurement intervals and the 1 km path.
authors.affiliation: Information Technology R&D Center, Mitsubishi Electric Corporation, Japan. Kameyama.Shumpei@dn.MitsubishiElectric.co.jp
authors.forename: Shumpei
authors.initials: S
authors.lastname: Kameyama
authors.forename: Masaharu
authors.initials: M
authors.lastname: Imaki
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Hirano
authors.forename: Shinichi
authors.initials: S
authors.lastname: Ueno
authors.forename: Shuji
authors.initials: S
authors.lastname: Kawakami
authors.forename: Daisuke
authors.initials: D
authors.lastname: Sakaizawa
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Nakajima