Pulse method laser ranging technology principle:
The phase method is similar to the method used for ultrasonic speed measurement and distance measurement. The maximum measurement distance is usually several hundred meters, which can easily reach the order of millimeters. However, the maximum measurement distance of the rangefinder designed according to this method is limited. expand. This method is widely used abroad. The pulse method laser ranging generally uses infrared lasers, including near-infrared lasers and mid-infrared lasers. There are visible and invisible lasers in this band. And the range finder based on this technology has low requirements for coherence, fast speed, simple structure, high peak output power, high repetition frequency and large range, so this project uses the pulse method to design a handheld laser range finder.
The principle of phase method laser ranging technology:
The mainstream laser range finder on the market is based on the phase method. This is because the laser rangefinder based on the phase method can easily overcome a major defect of ultrasonic distance measurement: the error is too large, so that the measurement accuracy can reach the millimeter level. The main disadvantage of the laser range finder based on this method is that the circuit is complex and the action distance is short (about 100 meters, after the efforts of many scientific workers, there are now phase method laser range finders with an action distance of several hundred meters) .
The phase method laser ranging technology is to use the radio band frequency laser to perform amplitude modulation and measure the phase difference generated by the sinusoidal modulated light going back and forth between the range finder and the target object. According to the wavelength and frequency of the modulated light, the laser is converted. Flight time, and then calculate the distance to be measured in turn. This method generally needs to place a reflector at the object to be measured to reflect the laser back to the laser range finder through the original path, and receive and process it by the wave detector of the receiving module. That is to say, this method is a passive laser ranging technology with cooperative target requirements.
What are the technical principles of the laser rangefinder?
