The laser rangefinder is an instrument that uses lasers to accurately measure the policy interval. During operation, the laser rangefinder emits a very thin laser rangefinder light to the policy. The photoelectric element receives the laser beam reflected by the policy. The timer measures the time from the launch to the reception of the laser beam, and calculates the time from the observer to the policy. Interval. If the laser is fired continuously, 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 general accuracy is definitely low, but it can achieve better relative accuracy when used at a long distance. Mayman, a scientist at Hughes Aircraft Corporation in the United States, developed the world's first laser in 1960.

On this basis, military laser equipment was discussed on the basis of the United States. In 1961, the first military laser rangefinder passed the U.S. military certification experiment, and the laser rangefinder soon entered the useful consortium. The laser rangefinder is light in weight, small in size, simple to operate, fast and accurate. Its error is only one-fifth to one-hundredth of other optical rangefinders, so it is widely used in topographic survey, battlefield survey, tank survey, aircraft survey, ship survey, artillery survey, cloud survey, aircraft survey, missile survey Surveying and satellite surveying. It is an important technical equipment to improve the accuracy of tanks, aircraft, ships and artillery. As the price of laser rangefinders continues to drop, laser rangefinders have gradually begun to be used in industry. 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. One-dimensional laser rangefinder is mainly used for interval measurement and positioning; two-dimensional laser rangefinder (ScanninglaserRangefinder) is used to summarize measurement, positioning, area monitoring and other fields; three-dimensional laser rangefinder (3DLaserRangefinder) is used for three-dimensional summary measurement, three-dimensional Space positioning and other fields.

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

Generally, precision distance measurement requires the cooperation of total reflection prisms, and the room measurement rangefinder directly uses the lubricating wall reflection measurement, mainly because the distance is relatively close, and the signal intensity of the light reflection is large enough. It can be known that it must be straight, otherwise the signal coming back is too weak and the accurate interval cannot be obtained.

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

The principle of ranging can be attributed to the measurement of the time required for the light round trip policy, and then the interval D is calculated by the speed of light c=299792458m/s and the atmospheric refraction coefficient n. Since it is difficult to measure time directly, it is generally used to measure the phase of continuous wave, which is called a phase measuring rangefinder. Of course, there are also pulse rangefinders, and the typical WILDDI-3000 needs 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 surveying, and its working principle is the same.

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

Generally speaking, thin plastic plates can be used to deal with serious problems of diffuse reflection.