How about a Laser Displacement Sensor
Laser displacement sensors are sensors that utilize laser technology for measurement. It consists of a laser, a laser detector and a measuring circuit. Laser sensors are new measuring instruments. It can accurately measure the position, displacement and other changes of the measured object without contact.
Precision geometric measurements such as displacement, thickness, vibration, distance, diameter, etc. can be measured. The laser has the excellent characteristics of good straightness, and the laser displacement sensor has higher accuracy than the known ultrasonic sensor. However, the laser generating device is relatively complex and bulky, so it has strict requirements on the application range of the laser displacement sensor.
Basic principle: The laser displacement sensor can accurately and non-contactly measure the position and displacement of the object to be measured. It is mainly used in the measurement of geometric quantities such as displacement, thickness, vibration, distance, diameter, etc.
According to the measurement principle, the principle of laser displacement sensor is divided into laser triangulation method and laser echo analysis method. The laser triangulation method is generally suitable for high-precision and short-distance measurement, while the laser echo analysis method is used for long-distance measurement. Two measurement methods of the principle of laser displacement sensor are introduced.