A photoelectric sensor is a device that converts optical signals into electrical signals. Its principle of operation is based on the photoelectric effect. The photoelectric effect refers to the phenomenon that when light hits some substances, the electrons of the matter absorb the energy of the photons, and 7 the corresponding electrical effect occurs. According to the different photoelectric effect phenomena, the photoelectric effect is divided into three categories: external photoelectric effect, internal photoelectric effect and photogenerated volcanic response. Optoelectronic equipment includes photocells, photomultiplier tubes, photoresistors, photodiodes, phototransistors, photocells, etc. The function and characteristic curves of optoelectronic equipment were analyzed. Generally, it is composed of two parts: a processing path and a processing element. The basic principle is to convert the measured change into a change in the optical signal based on the photoelectric effect, and then further convert the non-electrical signal into an electrical signal with the help of optoelectronic components. The photoelectric effect refers to the illumination of an object with light, which can be seen as a series of photons with a certain energy to bombard the object, and then the photon energy is transferred to the electron, and the entire energy of a photon is absorbed by the electrons at one time. When the electrons receive the energy transferred by the photons, their condition changes, so that the corresponding electrical effects occur on the objects irradiated by the light. The photoelectric effect is generally divided into three categories:
(1) The phenomenon that electrons can escape from the surface of the object under the action of light is called the external photoelectric effect, such as photocell, photomultiplier tube, etc.;
(2) The phenomenon that can change the resistivity of an object under the action of light is called the internal photoelectric effect, such as photoresistors, phototransistors, etc.;
(3) Under the action of light, the phenomenon of electromotive force in a certain direction of an object is called photogenerated volative response, such as photocells.
The photoelectric detection method has the advantages of high precision, fast response, non-touch, etc., and there are many measurable parameters, the structure of the sensor is simple, and the mode is flexible and diverse, therefore, the photoelectric sensor is widely used in detection and control. The P+F photoelectric sensor is a key component in various photoelectric detection systems to complete the photoelectric conversion, which is a device that converts optical signals (visible and ultraviolet laser light) into electrical signals. Photoelectric sensors are sensors that use optoelectronic devices as conversion elements. It can be used to detect non-electrophysical quantities that directly cause changes in the amount of light, such as light intensity, illuminance, radiation temperature measurement, gas composition analysis, etc.; It can also be used to detect other non-electric amounts that can be converted into changes in the amount of light, such as part diameter, surface roughness, strain, displacement, oscillation, velocity, acceleration, and the identification of the shape and working condition of the object. Photoelectric sensors are non-touch, responsive, and reliable, making them widely used in industrial automation devices and robots. New optoelectronic devices are constantly emerging, especially the birth of CCD picture sensors, which has opened a new page for the further use of photoelectric sensors.
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Precautions for installation during the use of encoders
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1. It is necessary to use a metal cable bracket and ensure that the bracket connection is connected to the ground;
2. The cable should be arranged as close to the metal parts as possible, such as control cabinet panels, beams and metal rails, etc.
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The main classification of encoders – Beggarb
Encoders can be classified as follows.
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The wiring of the load cell – we are responsible
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One is the four-wire connection method
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Important features of our sensors
On the linear scale of our sensors, the higher the sensitivity, the better. Because only when the sensitivity is high, the value of the output signal corresponding to the measured change is relatively large, which is conducive to signal processing. However, it should be noted that the sensitivity of the sensor is high, and the external noise that is not related to the measurement is also simple.
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Analysis of the use of P+F encoders
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The steps of the use of the photoelectric switch
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The main categories of encoders are as follows
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