Monitoring system of light receiving levels
专利汇可以提供Monitoring system of light receiving levels专利检索，专利查询，专利分析的服务。并且PURPOSE: To monitor light input levels readily without using temperature compensation at all by detecting the noises produced within the light receiving system.
CONSTITUTION: The output of a DC reproducer 3 is separated to signal and noise by LPF 6 and HPF 7. Since the noise contains higher frequency bands as compared to the signal, only the noise may by readily drawn out. After sufficient amplification of the noise, the noise mean value is detected by performing rectifying and smoothing and said value is compared with a reference voltage. An alarm is given wben it exceeds the refernse voltage. Since there is a specified relation between the effective value of the shot noise which an avalanche photo diode produces and light input, monitoring of the shot noise eliminates the need for temperature compensation and the light input levels may be monitored by the simple circuits.
COPYRIGHT: (C)1979,JPO&Japio，下面是Monitoring system of light receiving levels专利的具体信息内容。
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