What are the laser range finder's underlying technical principles?
Pulse method laser ranging technology principle:
The phase approach is comparable to the speed and distance measuring techniques used in ultrasonic technology. Several hundred meters is typically the maximum measurement distance, which is readily on the order of millimeters. However, the rangefinder created using this method has a limited maximum measurement distance. expand. This approach is popular overseas. Infrared lasers, such as near-infrared and mid-infrared lasers, are frequently used in pulse method laser ranging. In this band, there are both visible and invisible lasers. This project employs the pulse method to create a handheld laser range finder because the range finder based on this technology has low requirements for coherence, quick speed, simple construction, high peak output power, high repetition frequency, and broad range.
Phase method laser ranging technology principle:
The phase approach is the foundation of the commonplace laser range finder currently available. This is due to a significant flaw in ultrasonic distance measuring—the error is too large—being readily overcome by the laser rangefinder based on the phase approach, allowing for millimeter-level accuracy in measurement. The main drawbacks of the phase method laser range finder include its complicated circuit and limited action range (approximately 100 meters). However, thanks to the efforts of numerous scientists, there are already phase method laser range finders with an action range of several hundred meters.
The amplitude modulation and phase difference produced by the sinusoidally modulated light traveling back and forth between the range finder and the target item are measured by the phase method laser ranging technology, which uses a radio band frequency laser. The modified light's wavelength and frequency determine how the laser operates. Calculate the flight duration before determining each subsequent measurement's distance. In order to use this method, a reflector must typically be placed near the target object. This will allow the laser to return along its original course to the laser range finder, where the wave detector of the receiving module will collect and process the data. In other words, this technique uses passive laser ranging technology and requires cooperative targets.
