Photoelectric sensors (or light-sensitive sensors) are devices that use photoelectric devices to convert light signals into electrical signals (voltage, current, resistance, etc.). Classification by working principle Photoelectric effect sensor Infrared pyroelectric detector Solid state image sensor Fiber optic sensor consists of two major parts: optical path and circuit The optical path part realizes the control and modulation of the measured signal on the light quantity The circuit part completes the conversion from light signal to electrical signal Four basic forms Transmission Reflection Radiation Switch
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