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    Difference between Laser Sensor and Photoelectric Sensor

    Laser sensors are sensors that use laser technology to measure. It consists of a laser, a laser detector and a measuring circuit. Laser sensor is a new type of measuring instrument. Its advantages are that it can realize non-contact long-distance measurement, fast speed, high precision, large range, strong anti-light and electrical interference ability, etc.

    A photoelectric sensor is a device that converts optical signals into electrical signals. Its working principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon of the corresponding electrical effect occurring when the electrons of the material absorb the energy of photons when light is irradiated on certain substances. According to the difference of photoelectric effect phenomenon, photoelectric effect is divided into external photoelectric effect, internal photoelectric effect and photovoltaic effect. Photoelectric devices include photocells, photomultipliers, photoresistors, photodiodes, phototransistors, and photocells. The performance and characteristic curves of optoelectronic devices were analyzed.

    Laser sensor vs photoelectric sensor

    Laser sensor vs. photoelectric sensor

    Different working principle

    Photoelectric sensors are controlled by converting changes in light intensity into changes in electrical signals. The 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.

    Different light source

    The light source of the photoelectric sensor is visible red light and infrared light, but the 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. Changing the size, the difference between laser and ordinary is that the spot of the laser will be very small, and the spot will expand as the distance increases, but it is a very subtle change that cannot be seen by the naked eye.

    Different applications

    Laser sensors are mainly used in object detection, presence, positioning, counting, bump, positive and negative functions, and are widely used in packaging, electronics and other industries. Photoelectric sensors are used for level detection, liquid level control, product counting, width discrimination, speed detection, cut-to-length, hole recognition, signal delay, automatic door sensing, color mark detection, punch and shear, and safety protection and many other areas. In addition, using the concealment of infrared rays, it can also be used as anti-theft warning in banks, warehouses, shops, offices and other occasions where necessary.

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