The laser rangefinder is an instrument that uses a certain parameter of the modulated laser to measure the distance to the target. It is light in weight, small in size, simple in operation, fast and accurate, and its error is only one-fifth of other optical rangefinders. to a few percent.
The principle of phase method laser ranging technology: The mainstream laser distance meter on the market today is the laser distance meter based on the phase method. This is because the laser rangefinder based on the phase method can easily overcome a major defect of ultrasonic ranging: the error is too large, so that the measurement accuracy can reach the millimeter level. The main disadvantage of the laser rangefinder based on this method is that the circuit is complex and the working distance is short (about 100 meters, after the efforts of many scientists, there are also phase method
laser rangefinders with a working distance of several hundred meters) . The phase method laser ranging technology is to use the laser with the frequency of the radio band to perform amplitude modulation and measure the phase difference generated by the distance between the sine-modulated light and the distance between the rangefinder and the target, and convert the laser light according to the wavelength and frequency of the modulated light. flight time, and then calculate the distance to be measured in turn. This method generally requires a mirror to be placed at the object to be measured, and the laser beam is reflected back to the laser rangefinder on the original path, and the wave discriminator of the receiving module performs receiving processing. That is to say, the method is a passive laser ranging technique with cooperative target requirements.
