signal visibility

Light signal visibility test hand signals ( made by the driver of a car, etc to show which way it will turn, etc)

灯光信号显示距离测试手势信号（司机指示转弯等的）

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The emluator shows that if the signal power and the atmosphere visibility is enough, the bit-error rate of the laser signal will be very low even through the span beyond the visual range, so the establish of the reliable atmospheric laser communications is possible in the fog.

仿真结果表明，在一定的信号光强和能见度的情况下，即使传输距离超出能见度范围，激光信号传输的误码率也比较低。因此，在雾中建立可靠的大气激光通信是可能的。

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Light signal visibility test back focal distance

灯光信号显示距离测试

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Aiming at that ignoring interference signal error by multiple-beam interference in other measuring systems and low visibility of interference fringe due to the problem of interference system itself, the influence of multiple-beam interference is studied and found the error reaches to 8%.

针对目前的硅球直径测量系统忽略了多次反射对干涉信号造成的影响和系统中固有的条纹清晰度低的问题，研究了多次反射对干涉信号造成的误差，结果表明其最大光强误差可达到8%。

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