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研制了一套935nm水汽探测差分吸收激光雷达(DIAL)系统。种子注入的环形腔光参量振荡器,在窄线宽脉冲激光的抽运下,通过Ramp-Hold-Fire方法锁定光参量振荡器谐振腔,产生脉冲能量为45mJ、波长为935nm、重复频率为10Hz、脉冲持续时间为6ns的窄线宽、波长稳定的脉冲激光。接收望远镜直径为305 mm,使用雪崩光电二极管作为探测器,以935.776nm作为探测光波长(λon)、935.860nm作为参考光波长(λoff)进行了地基垂直差分探测实验,获得了上海地区对流边界层水汽浓度廓线。数据时间分辨率为60s,距离分辨率为30 m,在高度600m至对流边界层顶的范围内,水汽浓度昼夜有效测量误差小于0.1g/m~3,将DIAL数据与附近气象观测站无线电探空仪数据进行对比,结果证实了DIAL数据的有效性。
Developed a 935nm water vapor detection differential absorption lidar (DIAL) system. The seed-injected ring cavity optical parametric oscillator is locked by the Ramp-Hold-Fire method under the pumping of a narrow linewidth pulsed laser to generate a pulse energy of 45 mJ, a wavelength of 935 nm and a repetition frequency of 10 Hz , Pulse duration of 6ns narrow linewidth, wavelength stable pulsed laser. The receiving telescope has a diameter of 305 mm, an avalanche photodiode as detector, vertical differential detection of 935.776 nm as the probe light wavelength (λon) and 935.860 nm as the reference light wavelength (λoff). The convective boundary layer Water vapor concentration profile. The time resolution of the data is 60s and the resolution is 30m. The effective diurnal effective measurement error of water vapor concentration is less than 0.1g / m ~ 3 within the range of 600m to the top of the convective boundary layer. The DIAL data are compared with the radiometrics of nearby meteorological stations The comparison of the airborne data shows that the DIAL data is valid.