Sick Sensor - Introduction to photodiodes for photoelectric sensors

Create Date: 2024-8-30 12:03:23|Source: SICK/Sick

1. Photodiode

Photodiodes are generally in reverse operation in circuits

Dark current, photocurrent (the stronger the light, the photocurrent?) )

2. Phototransistor

There is no lead-out at the base, and the collector is positive with respect to the emitter

When light hits the collector junction, electron-hole pairs are created near the junction, resulting in a photocurrent, which is equivalent to the base current of a triode. Therefore, the collector current is β times that of the photogenerated current, so the phototransistor has an amplification effect.
Sick Sensor - Introduction to photodiodes for photoelectric sensors

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