The photoelectric switch is generally composed of three parts: transmitter, receiver and detection circuit. The transmitter aims at the target and emits a beam of light. The emitted light beam is usually composed of semiconductor light sources, light emitting diodes (LED), laser diodes and infrared light emitting diodes. Continuously emit the beam or change the pulse width. The receiver is composed of photodiodes, phototransistors and phototubes. In front of the receiver, optical components suc
(1) Night vision When the visibility is low and the light is insufficient, infrared rays are used for night vision equipment. When the night vision device is working, it will actively illuminate the target and then use the target to reflect the infrared light of the infrared source to implement the night vision technology of observation. This corresponding device is a night vision device. (2) Thermal imaging uses the infrared radiation emitted by the infrared emission tube to reach the tar
PN junction photodiodes, like other types of photodetectors, are widely used in photoresistors, photosensitive coupling elements, photomultiplier tubes and other equipment. They can output corresponding analog electrical signals (such as measuring instruments) or switch between different states of digital circuits (such as control switches, digital signal processing) according to the illuminance of the received light. Photodiodes are also used in consumer electronics products, such as CD playe
The working principle of the photoresistor is based on the internal photoelectric effect, that is, the electrode leads are installed at both ends of the semiconductor photosensitive material, and the photoresistor is formed by encapsulating it in a shell with a transparent window. In order to increase the sensitivity, the two electrodes are usually made into a comb shape. 1. The photoresistor module has high sensitivity to the environment and the light source, and is mostly used to detect the
Infrared light is a kind of light with invisible wavelength. Generally, there are the following three methods to generate this invisible light. ①, directly use incandescent lamp to emit infrared light. Then install a visible light filter on the lamp to filter out the visible light so that only the invisible infrared rays are emitted ②. Use infrared light-emitting diodes or diode arrays to generate infrared light. This device generates infrared light through the recombination of electrons and h
The working principle of the photoresistor is based on the internal photoelectric effect, that is, the electrode leads are installed at both ends of the semiconductor photosensitive material, and the photoresistor is formed by encapsulating it in a shell with a transparent window. In order to increase the sensitivity, the two electrodes are usually made into a comb shape.The photoresistor module has high sensitivity to the environment and the light source, and is mostly used to detect the brigh
Infrared light is a kind of light with invisible wavelength. Generally, there are the following three methods to generate this invisible light. ①, directly use incandescent lamp to emit infrared light. Then install a visible light filter on the lamp to filter out the visible light so that only the invisible infrared rays are emitted ②. Use infrared light-emitting diodes or diode arrays to generate infrared light. This device generates infrared light through the recombination of electrons and h
The appearance of conventional infrared lamp beads and visible light LED lamp beads are similar, but they emit invisible light (infrared). The working voltage is 1.4v up and down, and the working current is lower than 20mA. In order to adapt to different working voltages in various environments, there is a current-limiting resistance in the loop. 1. Voltage: infrared LED lamp bead low-voltage power supply, the power supply voltage is between 2-4V, depending on the product, it is driven by it t
Smart infrared switches are high-tech products, energy-saving, environmentally friendly and stable in performance. It can be said to be a perfect substitute for sound and light control products. It can automatically and quickly turn on various electrical equipment, such as lamps, burglar alarms, automatic doors, etc., through human body radiation. It is especially suitable for mid-to-high-end hotels, apartments, enterprises and institutions, shopping malls, aisles, corridors, etc. The methods ar
Most of the LED lamp beads are built-in lenses, and a few do not have lenses. The lens is divided into concave lens, flat lens, convex lens, and the material of general lens is composed of potting glue. A small amount of high power shapes will be added. Lenses, lens materials are generally divided into three types: epoxy resin, silica gel, and PC.The function of the lens is to help the LED chip spread or gather the emitted light more evenly. 60 degrees and 90 degrees refer to LED lig
In the installation process of high pole lights, setting the tension spring is an extremely important part. Many customers and friends are not too clear on how to set up, and if the important component of the tension spring is set improperly, it will easily cause some unnecessary troubles. Next, let's follow the professional high-pole lamp manufacturers to learn how to set the tension spring.1. Disconnect the power supply, open the box machine, loosen the box cover screws, and remove the bo
There are many manufacturers that can produce LED lamp holders, and we can also notice that the quality of the products produced by various manufacturers is uneven, and this brings difficulties to the choice of customers and friendsThe LED fluorescent lamp can save more than 80% of electricity, and its life span is more than 10 times that of ordinary lamps. It is almost maintenance-free, and the cost saved in about half a year of bayonet lamp holders can be exchanged for the cost. 2. Noisy an
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