Industrial grade infrared photoelectric switch

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Industrial grade infrared photoelectric switch [Copy link]

Working principle of infrared photoelectric switch

Infrared is a type of electromagnetic ray, and its characteristics are equivalent to radio or X-rays. The light wave visible to the human eye is 380nm-780nm, and the long ray with a wavelength of 780nm-1mm is called infrared. The infrared photoelectric switches sold here prefer to use near-infrared rays that are close to the wavelength of visible light.

1. Direct reflection photoelectric switch

A direct reflection photoelectric switch is a sensor that integrates a transmitter and a receiver. When an object to be detected passes by, a sufficient amount of light emitted by the photoelectric switch transmitter is reflected to the receiver, and the photoelectric switch generates a switch signal. When the surface of the object to be detected is bright or its reflectivity is extremely high, a direct reflection photoelectric switch is the preferred detection mode.

2. Reflector reflective photoelectric switch

　 The reflective plate reflective photoelectric switch also integrates the transmitter and the receiver. The light emitted by the photoelectric switch transmitter passes through the reflective plate and is reflected back to the receiver. When the detected object passes by and completely blocks the light, the photoelectric switch generates a detection switch signal.

3. Opposite-beam photoelectric switch



　 The opposite-beam photoelectric switch contains a transmitter and a receiver that are separated from each other in structure and whose optical axes are placed opposite to each other. The light emitted by the transmitter directly enters the receiver. When the detected object passes between the transmitter and the receiver and blocks the light, the photoelectric switch generates a switch signal. When the detected object is opaque, the opposite-beam photoelectric switch is the most reliable detection mode.

4. Slot type photoelectric switch

The 　 slot photoelectric switch is usually a standard U-shaped structure, with the transmitter and receiver located on both sides of the U-shaped slot, forming an optical axis. When the detected object passes through the U-shaped slot and blocks the optical axis, the photoelectric switch generates a detected switch signal. The slot photoelectric switch is relatively safe and reliable, suitable for detecting high-speed changes and distinguishing transparent and translucent objects.