Laser rangefinder phase method and pulse method laser ranging technology principle
4x zoom digital sight, 2.5-inch color display, inclination sensor integrated handheld laser rangefinder D5 is specially designed for outdoor measurement work Equipped with a variety of measurement functions, 4x zoom digital sight 4x zoom digital sight The sniffer allows you to aim at distant targets faster, and is also useful in bright outdoor environments. In an environment where the laser point cannot be distinguished by the naked eye, you can easily identify the laser point through the large 2.4-inch high-definition color display for accurate long-distance measurement.
The laser range finder 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 range finders. to a few hundredths. The world's first laser was a ruby laser developed successfully in 1960 by Maiman, a scientist from the Hughes Aircraft Company of the United States. The U.S. military soon launched research on advanced laser devices on this basis. In 1961, the first laser range finder passed the demonstration test of the US military, and the laser range finder soon entered the practical stage. Due to the continuous reduction in the price of laser range finders, the industry has gradually begun to use laser range finders. A batch of new miniature rangefinders with the advantages of fast ranging, small size and reliable performance have emerged at home and abroad, which can be widely used in industrial measurement and control, mines, ports and other fields.
Phase method laser ranging technology principle:
The mainstream laser range finder on the market today is the laser range finder 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.
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.
