Two-dimensional laser scanner can measure the position and displacement of the measured object without contact, mainly used in the measurement of the displacement, thickness, vibration, distance, diameter and other geometric quantities of the detected object. According to the measurement principle, the two-dimensional laser scanning principle is divided into laser triangulation method and laser echo analysis method, laser triangulation method is generally used in high-precision, short-distance measurement, laser echo analysis law is applied to long-distance measurement, the following Shenzhen Limeter spectral confocal manufacturers will introduce the two measurement principles of two-dimensional laser scanner:

First, the measurement principle of laser triangulation

The semiconductor laser is converged on the measured object by the lens. The reflected light is concentrated by the lens, and the signal processor 5 projected onto the CCD array uses the trigonometric function to calculate the position of the spot on the array 4 and obtain the distance from the object.

The laser transmitter directs the red laser light seen through the lens towards the surface of the object, and the laser light reflected by the object is received through the light-receiving lens by the CCD linear camera inside, which is able to "see" the spot at different angles depending on the distance. With this Angle known as the distance between the laser and the camera, the digital signal processor is able to calculate the distance between the sensor and the object.

At the same time, the beam is processed by analog and digital circuits at the position of the optical element, analyzed by a microprocessor, the corresponding output value is calculated, and the standard data signal is output proportionally in the analog window set by the user. When using the switch output, it opens in the set window and closes outside the window. In addition, the analog and switching outputs can be set to separate detection Windows.

Second, the measurement principle of laser echo analysis

A two-dimensional laser scanner can measure distance with a certain precision by using the principle of echo analysis. The interior of the sensor is composed of a processor unit, an echo processing unit, a laser projector and a laser light receiver. The two-dimensional laser scanner sends 1 million pulses per second from the laser transmitter back to the receiver, and the processor calculates the distance value by calculating the time it takes for the laser pulse to hit the probe back to the receiver. The output value is the average output of thousands of measurements.

Shenzhen Liyi Technology Co., Ltd. is a professional production and sales of displacement sensor, laser displacement sensor, Angle displacement sensor, spectral confocal sensor company, in need of friends can call to consult Liyi fiber coaxial displacement sensor manufacturers. Welcome your call!