同样，在一些实施例中，光滤波器212用来抑制反向散射的光信号。
Also, in some embodiments, the optical filter 21 2 is designed to reject back-scattered optical signals.
这架飞机上的一个探测设备记录下它收到脉冲反向散射所需时间而且这个时间可用于计算到森林树冠层和到树冠层下土壤的距离，以此而计算出树干高度。
A sensor on the aircraft records the time it takes to receive the backscattering of pulses, and that is used to compute distances to the forest canopy and to the soil beneath.
他使用卫星上的“太阳反向散射紫外辐射测量仪(SBUV, 1978年发射)”的数据观测云层。
He has been observing the clouds in data from Solar Backscatter Ultraviolet instruments that have been flown on satellites since 1978.
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