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入射到标准具上的光斑强度分布影响标准具透过率曲线的形状,进而影响风速反演。将激光入射进积分球后在腔壁上发生漫反射,出射激光光斑变均匀,从而使标准具的透过率曲线更准确。同时出射激光脉冲的宽度在时域上变宽,提高了探测的信噪比,扫描得到的标准具的透过率曲线也更稳定。同样的道理,锁定通道的锁定过程也由于这两点改变而更精确。积分球的这两点特性用于355 nm瑞利测风激光雷达系统中将大大提高探测的稳定性和信噪比。将激光通过积分球后扫描透过率曲线,在风速大小为±100 m/s的范围内计算得到的风速误差最大值为0.061 m/s,平均值为0.054 m/s。
The intensity distribution of the spot incident on the etalon affects the shape of the etalon transmittance curve, which in turn affects the wind velocity inversion. When the laser beam is incident on the integrating sphere, diffuse reflection occurs on the cavity wall, and the laser beam spot becomes uniform, so that the transmittance curve of the etalon is more accurate. At the same time, the width of the outgoing laser pulse broadens in the time domain, improves the signal-to-noise ratio of the detection, and the transmittance curve of the etalon is also more stable. By the same token, the locking process of the locking channel is also more accurate because of these two changes. These two points of integrating sphere are used in 355 nm Rayleigh wind lidar system will greatly improve the detection stability and signal to noise ratio. The maximum wind speed error calculated by the laser passing through the integrating sphere and the post-integral transmittance curve is 0.061 m / s and the average value is 0.054 m / s in the wind speed range of ± 100 m / s.