介绍了利用溴化亚铜激光器输出的脉冲激光通过光纤延时的方法测出光波波包中心所通过的光程及所需时间，从而实现测定光速的实验开设及其设计思想。

By using a fiber to postpone light pulse output from CuBr laser, the light speed can be determined by the time that light wave packet center traversed.

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和STEP7的定时器都具有接通延时、断开延时、保持接通延时、边缘触发延时和脉冲输出功能，LOGO！

Both of the timer LOGO! and STEP7 have the function of on-delay, off-delay, retentive on-delay and edge-triggered interval time-delay. LOGO!

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