Development of 1.6 micron CW modulation ground-based DIAL system for CO 2 monitoring

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We have demonstrated the 1.6 micron CW modulation hard-target DIfferential Absorption Lidar (DIAL) system for CO 2 sensing. In this system, ON and OFF wavelength laser lights are intensity modulated with CW modulation signal. Received lights of the two wavelengths from the hard-target are discriminated by modulation frequencies in electrical signal domain. Since the optical circuit is fiber-based, the system is compact, flexible, and reliable. It is shown that stable CO 2 concentration measurement corresponding to 4 ppm(rms) can be realized in the measurement time of 32s. This measurement stability is better than those obtained by the conventional CO 2 sensing DIAL systems in the same measurement time. And the diurnal change of the measured results is in good agreement with the ones measured by an in-situ CO 2 meter.

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