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The laser displacement sensor is a measurement sensor using laser technology, which consists of laser pointer, laser detector and measuring circuit. As a new measuring device, the laser displacement sensor can accurately measure the position, displacement and other changes of the measured object, as well as the precise geometric measurement of displacement, thickness, vibration, distance and diameter.
At present, the laser displacement sensor can be divided into two kinds according to the principle: laser triangulation method and laser echo analysis method. In current industrial robot applications, triangulation is usually adopted, which can achieve the highest linearity of 1um and the resolution of 0.1um.
The principle of triangulation is that the visible red laser is shot to the surface of the measured object through the lens, and the reflected laser is received by the internal CCD linear camera through the lens of the receiver. According to different distances, the CCD linear camera can “see” this point of light at different angles. Based on this Angle and the known distance between the laser and the camera, the digital signal processor can calculate the distance between the sensor and the object being measured.
At the same time, the beam is processed through analog and digital circuits at the position of receiving element, and the corresponding output value is calculated through microprocessor analysis, and the standard data signal is output proportionally in the analog quantity window set by the user. If the switch output is used, it is switched on in the set window and cut off outside the window. In addition, the detection window can be set independently for analog and switch outputs.
Echo analysis law is through laser emission per second one million laser pulse to detect objects and returns to the receiver, processor computing laser pulse in the time needed for detecting objects and returns to the receiver, in order to calculate the distance value, the output value is thousands of times the average of the measurement results of the output, the so-called method of measuring pulse time. The laser echo analysis method is suitable for long distance detection, but the measuring accuracy is lower than that of the laser triangulation method, with the longest detection distance up to 250m.
Data show that the domestic general laser displacement sensor market size has reached 12 billion, and the annual growth rate of 20%, but 99. 87% of the domestic market is occupied by foreign manufacturers, most of which are enterprises from developed countries such as Europe, America and Japan, such as general electric of the United States, thicke of Germany and keenes of Japan. These enterprises continue to maintain their market position through technological innovation and product upgrading. Although the recognition rate of China’s industrial automation system integrators is more than 95%, the actual utilization rate of this device is less than 10% due to the high price, difficult adaptation and other reasons. Recently, the laser displacement sensor has become a hot spot in the investment field, leading potential investment to announce a strategic investment in creative smart control, help creative smart control layout of laser displacement sensor system and industrial big data service track, and jointly expand its influence in the intelligent sensor industry. The laser displacement sensor, known as the robot’s eyes, plays an irreplaceable role in welding, blank manufacturing, mechanical processing, heat treatment, loading and unloading, assembly and other operations. So, what is a laser displacement sensor