Explain the Photosensitive Detectors?
A wide range of detectors varying in senstivity and cost are available. They contain a light sensitive surface that releases electrons in number proportional to the intensity of light on it, converting light energy into electrical energy. The current thus generated is a direct function of the light intensity. Different detectors used are:
a) Barrier layer cells
b) Photoemissive tubes
c) Photomultiplier tubes
d) Photoconductive cells