What kind of measurement principle does the laser rangefinder have?


A laser rangefinder is an instrument that uses a laser to accurately measure the distance between targets. The laser rangefinder emits a very thin laser rangefinder light to the target during operation. The photoelectric element receives the laser beam reflected by the target. The timer measures the time from emission to reception of the laser beam, and calculates the time from the observer to the target. Interval. If the laser is fired continuously, the measuring range can reach about 40 kilometers, and the fluorine-lined butterfly valve can be operated day and night. If the laser is pulsed, the accuracy is generally low, but it can achieve good relative accuracy when used for long-distance measurement. The first laser in the world was first successfully developed in 1960 by Mayman, a scientist at Hughes Aircraft Corporation of the United States.

The U.S. military quickly launched a study on military laser equipment on this basis. In 1961, the first military laser rangefinder passed the U.S. military certification experiment, after which the laser rangefinder soon entered the useful complex. Laser rangefinders are light in weight, small in size, simple to operate, fast and accurate, and their errors are only one-fifth to one-hundredths of other optical rangefinders. Therefore, they are widely used in terrain measurement, battlefield measurement, and tank , The distance measurement of aircraft, ships and artillery targets, measuring the height of clouds, aircraft, missiles and satellites. It is an important technical equipment to improve the accuracy of high tanks, aircraft, ships and artillery. Because the price of laser rangefinders continues to drop, the industry has gradually begun to use laser rangefinders. A number of new miniature rangefinders with the advantages of fast ranging, small size, and reliable functions have emerged at home and abroad, which can be widely used in industrial measurement and control, mines, ports and other fields. The main classification: One-dimensional laser rangefinder is used for interval measurement and positioning; two-dimensional laser rangefinder (Scanning Laser Rangefinder) is used for general measurement, positioning, area monitoring and other fields; three-dimensional laser rangefinder (3D Laser Rangefinder) is used for Three-dimensional general measurement, three-dimensional space positioning and other fields.

1.Does the plane of the measured object have to be straight with the light?

General precision ranging requires the cooperation of total reflection prisms, while the rangefinder used for house measurement directly measures the reflection on the lubricated wall. The main reason is that the distance is relatively close and the signal intensity of the light reflected is large enough. It can be known from this that it must be straight, otherwise the return signal is too weak and the accurate interval cannot be obtained.

2. What is the principle of using infrared ranging or laser ranging?

The principle of ranging can basically be attributed to the measurement of the time required for the optical round-trip policy, and then the interval D is calculated by the speed of light c = 299792458m/s and the atmospheric refraction coefficient n. Because it is more difficult to measure time directly, it is generally to measure the phase of continuous wave, which is called a phase measuring rangefinder. Of course, there are also pulsed rangefinders. The typical DI-3000 of WILD requires attention. Phase measurement is not to measure the phase of infrared or laser, but to measure the phase of the signal modulated on infrared or laser. There is a hand-held laser rangefinder in the construction industry, which is used for house measurement, and its operating principle is the same.

3. Is it possible if the plane of the measured object is diffuse reflection?

Generally, it is possible. In practical engineering, a thin plastic plate is used as a reflecting surface to deal with serious problems of diffuse reflection.