Analysis of the characteristics of photoelectric switch of radio frequency sensor

　　The photoelectric switch uses the light source as the medium and applies the photoelectric effect. When the light source is shielded by the object or reflected, radiated and shielded, the amount of light received changes to detect the presence, size, and brightness of the object, and output signals to the contact and non-contact. . Photoelectric switches include several types. They do not have a light source and use the change of light emitted by the object to be tested for detection; use natural light to irradiate the photoelectric switch, and the object shields the change of natural light; the photoelectric switch itself has a light source and emits The light source detects the amount of change in the reflected, absorbed, and transmitted light of the detected object. Commonly used light sources are ultraviolet light, visible light, infrared light and other wavelength bands. The types of light sources include bulbs, LEDs, laser tubes, etc.; output signals include switching or analog signals and communication data information.

　　Features of photoelectric switch:

　　1. Long detection distance: Compared with inductive proximity switches, a long detection distance can be obtained. For example, the detection distance of the through-beam switch can reach tens of meters, and the reflection has been from a few centimeters to several meters. Because it is a non-contact detection, It does not damage the measured object, nor is it affected by it.

　　2. Wide range of detection objects: Because the detection is based on the reflection and light transmission of the detection object, almost all metals, even glass, rubber, wood, liquid, gas, etc. can be detected.

　　3. Fast response speed: The detection medium itself is high-speed, because it contains almost no mechanical action, so a very high detection speed can be obtained.

　　4. High resolution: Because the light travels in a straight line and the wavelength is short, the resolution is high, and it is suitable for small objects and high-precision position detection.

　　5. Easy to obtain regular detection area: the lens and other optical systems can be used to easily condense, diffuse and refraction. Corresponding to different detection objects and different use environments, products with a certain detection area can be appropriately selected.

　　6. Not affected by magnetic field and vibration: detection switches are generally installed in places with strong magnetic fields and vibrations. In essence, photoelectric switches are rarely affected by them, so they can operate reliably

Read recommendations:

Sensors for detecting the water temperature of intelligent toilets.Microwave Radar Sensor

NTC thermistor for temperature measurement of smart bracelet.Radar Microwave Induction Sensor Switch

Diameter 3mm size

HW-US003 Offline speech recognition module

PIR Lens 8003-1