According to physical signification, three metrical methods are introduced: optical communication stimulant method, extremal measure method and frequency doubling modulation method.
根据其物理意义，介绍了三种测量方法：光通信模拟法、极值测量法、倍频调制法。
According to physical signification, three metrical methods are introduced: optical communication stimulant method, extremal measure method and frequency doubling modulation method.
根据其物理意义，介绍了三种测量方法：光通信模拟法、极值测量法、倍频调制法。
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