Introduction to the measurement method of laser displacement sensor

What is the measurement method of laser displacement sensor? Laser displacement sensor is a commonly used measuring instrument, which has certain applications in many industries. There are two commonly used measurement methods for laser displacement sensor, triangulation method and callback analysis method. Do you know about these two measurement methods? The following editor will introduce the side measurement method of laser displacement sensor in detail, hoping to help you.

Triangulation

The laser transmitter emits a visible red laser through the lens toward the surface of the object being measured. The laser reflected by the object passes through the receiver lens and is received by the internal CCD linear camera. Depending on the distance, the CCD linear camera can "see" this light spot at different angles.

Based on this angle and the known distance between the laser and the camera, a digital signal processor can calculate the distance between the sensor and the object being measured.

At the same time, the position of the light beam at the receiving element is processed by analog and digital circuits and analyzed by a microprocessor to calculate the corresponding output value and output a standard data signal in proportion within the analog window set by the user.

If the switch output is used, it will be turned on within the set window and turned off outside the window. In addition, the detection window can be set independently for analog and switch outputs.

The laser displacement sensor using triangulation measurement can achieve a maximum linearity of 1um and a resolution of 0.1um.

Echo analysis

Laser displacement sensor uses echo analysis principle to measure distance to achieve a certain degree of accuracy. The sensor is composed of processor unit, echo processing unit, laser transmitter, laser receiver and other parts.

The laser displacement sensor uses a laser transmitter to emit one million laser pulses per second to the detection object and return to the receiver. The processor calculates the time required for the laser pulse to encounter the detection object and return to the receiver, and calculates the distance value. This output value is the average output of thousands of measurement results. This is the so-called pulse time method. The laser echo analysis method is suitable for long-distance detection, but the measurement accuracy is lower than that of the laser triangulation method, and the maximum detection distance can reach 250m.

Of course, the measurement methods of different types of laser displacement sensors are not the same, and users need to use them according to the situation.