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What is a laser sensor?

A laser sensor is a device that uses laser light to measure or detect. Common applications include detecting the presence or position of an object. Also measuring the distance to an object. It is also possible to measure more complex things, such as the thickness or width of an object. See more under Special & Applications.

Different Types

The most basic types are diffuse, background suppression, retro-reflective, and through-beam.

Diffuse sensing means that the light emitted from the sensor is reflected back by an object. If the amount of light is sufficient, the object is detected. For example, dark objects that reflect light poorly may be more difficult to detect, or may be detected at a shorter distance compared to light objects.

Background suppression sensors use for example triangulation for distance estimation, and can detect objects with different colors at more or less the same distance.

The principle of "retro-reflective" means that the light from the sensor is reflected back to the sensor by a reflector. If an object breaks the light beam, detection occurs. This means that even objects that cannot be reliably detected with direct reflection can be detected with this principle.

Through-beam is similar to retro-reflective, with the difference that a receiver is located where the reflector would be. A sensor emits light, and a sensor receives light. This provides better function than retro-reflective and a longer sensing distance.

In addition to these principles, there are a number of more specialized solutions. For example, TOF or Time of Flight which works by calculating a distance based on how long it takes for the light to travel from the sensor to the target and back.