What is the principle of laser measuring instrument

The laser measuring instrument is an instrument that uses a certain parameter of modulated laser to measure the distance of the target. It is light in weight, small in volume, simple in operation, fast and accurate, and its error is only one fifth to one hundred times of that of other optical distance measuring instruments. As the price of the laser measuring instrument continues to fall, the industry has gradually begun to use the laser measuring instrument. At home and abroad, a number of new micro rangefinders with the advantages of fast ranging, small size and reliable performance have emerged, which can be widely used in industrial measurement and control, mines, ports and other fields.

Principle of laser measuring instrument

Principle of phase method laser ranging technology:

The mainstream laser rangefinder in the market today is the laser rangefinder based on the phase method. This is because the laser rangefinder based on the phase method can easily overcome a major defect of ultrasonic rangefinder: the error is too large, and the measurement accuracy reaches the millimeter level. The main disadvantages of the laser rangefinder based on this method are that the circuit is complex and the operating distance is short (about 100 meters. After the efforts of many scientific workers, there are also phase laser rangefinder with operating distance of several hundred meters).

Phase method laser ranging technology is to use the laser of radio band frequency to perform amplitude modulation and measure the phase difference generated by the distance between the sinusoidal modulated light and the target object. According to the wavelength and frequency of the modulated light, the laser flight time is converted, and then the distance to be measured is calculated in turn. This method generally needs to place a mirror at the object to be measured to reflect the laser back to the laser rangefinder, and the wave detector of the receiving module receives the laser. In other words, this method is a passive laser ranging technology with cooperative target requirements