Listing ID #3854611
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Contact SupplierA photo diode consists of a p - n junction coated with
translucant film . The light (radiation) is allowed to fall upon
its surface, across the junction. The junction is made reverse - biasedÂ
with an e.m.f source. A reverse current flows nearly linearlyÂ
with the intensity of light flux.the reverse - biased current flowsÂ
through diode is linear function of light intensity, thus to measureÂ
the light intensity level, this current is passed through a precisionÂ
fixed resistance R. The reverse current devlope propotional voltageÂ
across the R, which is than amplified to desired level by an amplifier.