Reference

Principle

The principle of IR photoelectric switch:
Light is a kind of electromagnetic ray, similar with radio and X-ray. Its transmission speed can reach up to 300000 Km/s, but light can be absorbed just at its emission instant. Infrared photoelectric switch can be used to detect objects through near-infrared ray or infrared ray that is invisible to human eyes. The main point of IR photoelectric switch is that it can process the variations in the intensity of light：use optical elements to make light beam change in its transmission media; light beam will be reflected by objects; light beam returns instantly after going for a long distance. Photoelectric switch usually includes a light emission head for emitting light to an object to be detected, a light reception head for receiving light from the object, and a main unit for processing the received light from the light reception head.

Precautions

When using the Diffuse Reflection Infrared Switch, we have to pay close attention to the working environment of the sensor. Although the sensor can work properly in conditions with high envoronmental illumination, still, please avoid putting the sensor optical aixs right in front of intense light source like sunlight, incandescent lamp and so on.