In phase shift laser rangefinder, the received power determines the signal to noise ratio, conse quently the depth of field and the accuracy, so it is of importance to calculate the received power accurately.

• 在相位式激光测距中，接收光功率的大小直接决定了测量信噪比，从而决定了测量范围和测量精度，因此如何准确地计算出接收光功率的大小，是测距技术中一个非常重要的问题。