How To Use Laser Rangefinder?

With the development of science and technology, it seems that most people do not know that there is a Laser Rangefinder, and do not understand the laser rangefinder. Even some workers are still using a tape measure distance, with a pen to calculate the area's volume, and so on. The laser rangefinder is an instrument that uses a laser to accurately measure the distance of the target. When it works, it shoots a very fine laser beam at the target. The photoelectric element receives the laser beam reflected by the target. The timer measures the time from the laser beam to the receiving time and calculates the distance from the observer to the target.

If the laser is continuously fired, the range can be about 40 kilometers, and the operation can be carried out day and night. If the laser is pulsed, the absolute accuracy is generally low, but for long-distance measurement, can achieve good relative accuracy.

The world's first laser, by the United States Hughes Aircraft Company scientist Maiman in 1960, was first developed successfully. The United States military soon carried out research on military laser devices on this basis. In 1961, the first military rangefinder passed the demonstration test of the United States military. After that, the rangefinder soon entered the practical complex.

It is light in weight, small in size, simple in operation, fast, and accurate, its error is only one-fifth to a few hundredths of another optical rangefinder, so it is widely used in topographic surveys, battlefield surveys, tanks, aircraft, ship and artillery target ranging, measuring the height of clouds, aircraft, missiles and artificial satellites. It is an important technical equipment to improve the accuracy of high tanks, aircraft, ships, and artillery.

As the price of rangefinders has been falling, the industry has gradually begun to use laser rangefinders. At home and abroad, a number of new micro rangefinders with fast ranging, small size, reliable performance, and other advantages, can be widely used in industrial measurement and control, mine, port, and other fields.

1. Laser rangefinders and other rangefinders (such as microwave rangefinders, etc.) compared with the characteristics of:

① The detection distance is long and the ranging accuracy is high

② Strong anti-interference

③ Good confidentiality

④ Small size

⑤ Lightweight

2. Laser ranging is different from laser length measurement, its measuring distance is much larger, according to the measuring distance can be divided into the following three categories:

①The short-range laser rangefinder, whose measuring range is only within five kilometers, is suitable for all kinds of engineering measurement; Medium and long-range rangefinder, measuring range of 5 to dozens of kilometers, suitable for geodetic control measurement and earthquake prediction;

②Long-range, which is used to measure the distance of missiles, satellites, the moon, and other space targets.

3. Ranging method classification

①Pulse ranging method: the rangefinder sends out a light pulse, and after being reflected by the measured target, the light pulse back to the rangefinder receiving system, measuring the time interval between transmitting and receiving light pulse, that is, the round trip propagation time t of the light pulse on the distance to be measured. Pulse method ranging accuracy is mostly in the order of meters:

②Phase ranging method: it is to measure the phase change of continuously modulated light wave in the distance to be measured round trip propagation, indirect measurement of time t. This method has been widely used in geodetic and engineering surveying because of its high precision

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

The principle of ranging can be basically reduced to measuring the time required by the light to travel to the target, and then calculating the distance D through the speed of light c =299792458m/s and atmospheric refraction coefficient n. Since it is difficult to measure time directly, the phase of continuous wave is usually measured, which is called a phase rangefinder. Of course, there are pulse-type rangefinders, typically WILD's DI-3000

Note that phase measurement does not measure the phase of the infrared or laser, but rather the phase of the signal modulated on the infrared or laser. The construction industry has a handheld laser rangefinder for house measurements that works in the same way.

5. Must the plane of the measured object be perpendicular to the ray?

Usually, precision ranging requires full reflection prism coordination, but the rangefinder used for house measurement directly uses the smooth wall reflection measurement, mainly because the distance is relatively close, and the signal intensity of light reflected back is large enough. And you know, it has to be perpendicular, otherwise, the return signal is too weak and you can't get the exact distance.

6. Is it OK if the plane of the measured object is diffuse?

Usually, it is OK. In practical engineering, a thin plastic plate will be used as the reflective surface to solve the serious problem of diffuse reflection.

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