It is very important to accurately control the distance between the cutting head and the workpiece and the perpendicularity between the nozzle and the workpiece surface when the optical fiber laser cutting machine is cutting. The quality of control will directly affect the processing quality of laser cutting equipment, so in order to improve the cutting quality and reduce unnecessary losses, it is necessary to install some special sensors on the laser cutting head to ensure that it can produce stable and consistent cutting quality and improve the safety of the production process.
When the shape of the laser cutting head changes and the surface is uneven, the sensor automatically detects the change and automatically adjusts the height according to the change, so that it always keeps the same distance from the surface of the workpiece, so that the material can be processed faster without continuous supervision. When the displacement sensor used at home and abroad is basically capacitive, its structure and shape are compatible with the processing head, and it is equipped with a detection signal processing unit.
Displacement measurement is a basic measurement work. According to whether the sensor is in contact with the measured workpiece, the displacement sensor can be divided into contact type and non-contact type. Compared with the contact type sensor, the non-contact type sensor has fast dynamic response speed, low hysteresis error, or even zero while ensuring high resolution.
Non-contact sensor, sometimes called proximity sensor, was used in the early years as a proximity switch, that is, when the detected object is close to a certain distance from the sensitive probe, the switch signal is given. The current proximity sensor has developed to not only detect the presence of an object, but also give the distance between the object and the sensitive probe, and can provide information about the shape and spatial position of the workpiece, Because it can be used to measure the displacement of moving objects, this type of sensor is also called non-contact displacement sensor. The commonly used displacement sensors include magnetostrictive displacement sensor, eddy current displacement sensor, capacitive displacement sensor, inductor displacement sensor, etc.
