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News Details
07
2022
-
05
The difference between access control laser sensor and photoelectric sensor
1. Principle: Photoelectric sensors are controlled by converting changes in light intensity into changes in electrical signals. The access control laser sensor firstly emits laser pulses at the target by the laser emitting diode.
The difference between access control laser sensor and photoelectric sensor:
1. Principle
Photoelectric sensors are controlled by converting changes in light intensity into changes in electrical signals. The access control laser sensor firstly emits laser pulses at the target by the laser emitting diode. After being reflected by the target, the laser light is scattered in all directions. Part of the scattered light returns to the sensor receiver, which is received by the optical system and then imaged onto the avalanche photodiode and converted into a corresponding electrical signal.
2. Light source
The light source of the photoelectric sensor is visible red light and infrared light, but the access control laser sensor uses laser technology to measure the sensor. The difference here is that the spot of red light and infrared light is large, which will increase with the distance, which is not conducive to detecting small objects. The light source of access control laser sensor is a laser, which is also a light source. The light source will change in size with the distance. The difference between the laser and the ordinary laser is that the spot of the laser will be very small. As the distance increases, the spot will expand, but it is Very subtle changes cannot be seen by the naked eye, so people usually say that the light source of the laser will not expand.
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