The photoelectric sensor is a sensor with a photoelectric device as the detection element. It first converts the measured non-electricity into a change in the amount of light, and then converts the corresponding amount of light into an amount of electricity through the optoelectronic device. The photoelectric sensor uses the photoelectric effect of optoelectronic devices to work.

These three photoelectric effects are mainly used.
1. External photoelectric effect: the phenomenon that electrons of an object escape from the surface under the action of light. For example, photoelectric devices such as photoelectric tubes.
2. Internal photoelectric effect: The photoelectric sensor manufacturer tells you the phenomenon that the resistivity of an object can be changed under the action of light. For example, photoelectric devices such as photoresistors.
3. The photoelectric effect of the barrier layer: the phenomenon that an object can generate an electromotive force in a certain direction under the action of light. For example, photovoltaic devices such as photovoltaic cells.
The photoelectric sensor is widely used in detection and control. It is basically divided into two categories: analog sensor and pulse sensor.
1. Analog sensor: the photocurrent of the photoelectric device changes with the change of the luminous flux. Such as photoelectric colorimetric pyrometer.
2. Pulse sensor: The photoelectric sensor manufacturer tells you that the output of the photoelectric device has only two stable states, which are the switch states of "on" and "off", that is, the photoelectric device has an electrical signal output when it is illuminated, and there is no electricity when there is no light. Signal output. For example, optical encoders.
The photoelectric sensor manufacturer tells you that there are still CCD image sensors manufactured using charge-coupled device (CCD) photoelectric transfer and charge transfer.