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What is the principle of laser rangefinder?

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What is the principle of laser rangefinder?

Date of release:2019-03-18 Author: Click:

Laser rangefinder is an instrument that uses laser to accurately measure the interval between policies. During operation, the laser rangefinder emits a very thin beam of laser rangefinder light to the guideline, and the photoelectric element receives the laser beam reflected by the guideline. The timer measures the time from emission to reception of the laser beam and calculates the interval from the observer to the guideline. If the laser is continuously emitted, the measuring range can reach about 40 kilometers, and the fluorine-lined butterfly valve can operate day and night. If the laser is pulsed, the accuracy is generally lower, but it can reach a good relative accuracy when used for long distance measurement. The world's first laser was developed in 1960 by Mayman, a scientist from Hughes Aircraft Company.

The U.S. military soon started a discussion 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 a useful consortium. Laser rangefinders are light in weight, small in volume, simple to operate, fast and accurate, and their errors are only 1/5 to 1% of those of other optical rangefinders. As a result, they are widely used in terrain measurement, battlefield measurement, ranging of tanks, planes, ships and artillery on policies, and height measurement of clouds, planes, missiles and artificial satellites. It is an important technical equipment to improve the precision of high tanks, planes, ships and artillery. Because the price of laser rangefinders keeps dropping, the industry is gradually starting to use laser rangefinders. At home and abroad, a number of new micro range finders have emerged, which have the advantages of fast ranging, small size and reliable function. They can be widely used in industrial measurement and control, mines, ports and other fields. First classification One-dimensional laser rangefinder is used for interval measurement and positioning. The two-dimensional laser range finder is used in the fields of general measurement, positioning, area monitoring, etc. Three-dimensional laser range finder is used in three-dimensional general measurement, three-dimensional spatial positioning and other fields.

1. Must the plane of the measured object be straight with the light?

General precision distance measurement requires the cooperation of total reflection prism, while the distance meter used for house measurement is directly measured by lubrication of wall surface reflection, mainly because the interval is relatively close and the signal intensity reflected by light is large enough. At the same time, we can know that we must be straight, otherwise the return signal is too weak to get an accurate interval.

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

The principle of distance measurement can basically be summed up as measuring the time required for the light round trip policy, and then calculating the interval d through the speed of light c =299792458m/s and the atmospheric refractive index n. Because it is difficult to measure time directly, it is usually to measure the phase of continuous wave, which is called phase measuring range finder. Of course, there are also pulse range finders, typically WILD DI-3000. Note that phase measurement does not measure the phase of infrared or laser light, but the phase of the signal modulated on the infrared or laser light. The construction industry has a hand-held laser range finder for measuring houses. Its operation principle is the same as this.

3. If the plane of the measured object is diffuse reflection, can it be?

Generally, it is also possible. In practical projects, thin plastic plates will be used as reflecting surfaces to deal with serious diffuse reflection problems.

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Key word:Chongqinglaserrangefinder

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