How Does the Laser Displacement Sensor Work?

The core of the working principle of the laser displacement sensor lies in the interaction between the laser and the surface of the measured object. It mainly achieves measurement in the following two ways:

Laser triangulation: This method is particularly suitable for scenarios that require high-precision and short-distance measurements. The sensor emits a laser beam, and when the laser beam hits the surface of the object to be measured, it will reflect. This reflected light is captured by one or more receivers inside the sensor. Since the displacement of the object changes the angle of the reflected light, the light-receiving element (such as PSD or CCD) inside the sensor can accurately sense these small angle changes. By analyzing these changes, we can accurately calculate the displacement of the measured object.

Laser echo analysis method: This method is more suitable for long-distance measurements, although its accuracy is relatively low. The sensor emits a pulse of laser light and precisely times the time it takes for the pulse to go from being emitted to being reflected back from the object. Based on this time difference, we can calculate the distance between the object and the sensor. This method is very effective where fast, long-distance measurements are required.

In short, the laser displacement sensor uses the non-contact measurement technology of laser to achieve accurate measurement of the position, displacement and other changes of the measured object by capturing and analyzing the reflected laser signal.