What are the characteristics of the photoelectric switch

Nowadays, many people use photoelectric switches in house decoration, but they don't know much about the working principle and characteristics of photoelectric switches. The following editor of okplazas.com will give you some knowledge about photoelectric switches!

1. The working principle of photoelectric switch. The photoelectric switch utilizes the blocking or reflection of the light beam by the detected object, and the synchronous loop gates the circuit to detect the presence or absence of the blocked object. All objects that can reflect light can be detected. The photoelectric switch converts the input current into a light signal on the transmitter and emits it, and then the receiver detects the target object according to the intensity or presence of the received light. Most photoelectric switches use infrared light waves with wavelengths close to visible light.

2. Features of photoelectric switch

(1) Long test distance. Compared with inductive proximity switches, photoelectric switches can obtain a longer test distance.

(2) Not affected by magnetic field and vibration. Most test switches are installed in places with strong magnetic fields and vibrations, but photoelectric switches are rarely affected by them and can be used reliably.

(3) High resolution ability. Light travels in a straight line, with short wavelength and high resolution, suitable for small objects and high-precision position testing.

(4) A wide range of test objects. Almost all metals, glass, rubber, wood, liquid, gas, etc. can be tested.

(5) Test area with easy access to rules. The photoelectric switch uses an optical system such as a lens, which is easy to condense, diffuse and refract. According to different test objects and use environments, products with a certain test area can be appropriately selected.

(6) Fast response speed. The photoelectric switch hardly contains any mechanical action, so it can obtain a high test speed.

(7) The light characteristics can be used for testing, and the color code and shape feature selection test can be done.

3. Model of photoelectric switch.

(1) Photoelectric switches can be divided into three types: amplifier separated type, amplifier built-in type and power supply built-in type according to different structure models.

(2) According to different detection methods, photoelectric switches can be divided into diffuse type, through-beam type, mirror reflection type, slot type and fiber type.

4. Precautions for the use of photoelectric switches.

(1) The infrared sensor is a diffuse reflection type product, and the standard detection body used is flat white drawing paper.

(2) Infrared photoelectric switches can work stably under high ambient illuminance, but in principle, you should try to avoid directing the sensor's optical axis to strong light sources such as sunlight.

(3) The minimum detectable width of the through-beam photoelectric switch is 80% of the lens width of the photoelectric switch.

(4) When using an inductive load, its transient inrush current will be relatively large, so it may damage the AC two-wire photoelectric switch. In this case, the load should be converted to use through an AC relay.

(5) The lens of the infrared photoelectric switch can be wiped with lens cleaning paper, but it is strictly prohibited to use chemicals such as diluent solvents to avoid permanent damage to the plastic lens.

(6) When using and replacing the photoelectric switch, you must confirm the voltage level and ensure the wiring is correct to avoid accidents. (7) The place where the photoelectric switch is used should be avoided as far as possible from places with more dust, more corrosive gases, excessive changes in ambient temperature, large vibration and impact, and no shock-absorbing measures.