We all know that laser diodes are widely used in daily life, so do you know what role laser plays in the field of sensors? Where are the main applications?

Industrial detection

In the scenes of factory automation and quality inspection, laser sensing is used a lot.

Laser three-dimensional profiler: scan the surface of an object by laser line, generate a 3D model, and detect welds, edges or assembly gaps.

Laser correlation detection: put a transmitter and a receiver on both sides to judge whether the product is in place or not and whether the parts are missing.

What these devices have in common is fast measurement, accurate measurement, and more environmental noise, and laser can just meet these points.

Intelligent transportation and automatic driving

In vehicle-mounted sensing system, LiDAR is one of the key components. It scans the surrounding environment by laser pulses of 905nm or 1550nm, and calculates the return time difference to obtain three-dimensional spatial information.

Security monitoring

The role of laser in the field of security is also quite typical, such as:

Laser perimeter protection system: laser beam is arranged on the boundary, and alarm will be given as soon as it is blocked.

Laser ranging monitoring: it can measure the position and moving speed of the target from a distance, especially suitable for outdoor environment.

This laser sensing scheme has strong anti-interference and few false positives, so many high-end monitoring systems will match it.

Medical and biological testing

Laser sensing technology is increasingly used in the medical field.

Environment and scientific research detection

Laser can also detect gas concentration, dust, smog and even temperature.

For example, the laser dust sensor is to judge the concentration by irradiating the particles in the air with laser light and then analyzing the scattered light intensity.

I have tested a laser particle sensor module before, which uses a combination of laser diode and photodetector, and its accuracy is several times higher than that of infrared LED.

The above is the application and function of laser, I hope it will help you.