silicon photodiode

Definition: Device that widely used as a light-detector e.g. exposure meters in cameras, flash-meters, etc. * Based on a PN or PIN junction which absorbs photon energy between 1.06 to 1.03 eV to excite carriers from one energy level to a higher state resulting in a change of charge. * These devices are stable, rapidly and linearly responsive, making them ideal for exposure control.

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