LIGHT_TRANSMISSION_CHECKER

Published:2009/7/2 2:16:00 Author:May | From:SeekIC

Phototransistor and quad opamp serve as total-energy detector of pulsed-light signals propagated through fiber-optic cable of communication system. Can be used for checking and comparing condition of long fibers if light intensity of source is held constant. Will also detect changes in light intensity and changes in pulse width. Circuit gives linear response to light levels from 100 to 10,000 ergs/cm2 if minimum pulse width is at least10 μs. A2, acts as RC integrator, giving voltage proportional to total light energy received. A4 provides comparison to fixed level.-E. W. Rummel, Low-Level-Light Detector Checks Optical Cables Fast, Electron-Jcs, April 27, 1978, p 148 and 150.



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