# The manufacturer of the laser rangefinder tells you the problem of the rangefinder in use

2021.11.23

Now the laser rangefinder can easily measure the distance without using a ruler to calculate it. It is a good helper for us to measure the distance. Chongqing laser rangefinder manufacturers remind that there are many brands of laser rangefinders, which can be determined according to their own budget and actual use. Domestic laser rangefinders are cheap, but their performance is worse than imported laser rangefinders. Imported laser rangefinders are mature, but the price is much higher than domestic laser rangefinders, and after-sales are more cumbersome than domestic laser rangefinders. What problems will laser rangefinders encounter during use? Chongqing laser rangefinder manufacturers have listed several common problems.

What is the principle of infrared ranging or laser ranging?

The principle of ranging can basically be attributed to measuring the time required for the light to travel back and forth to the target, and then calculate the distance d through the speed of light c=299792458m/s and the atmospheric refraction coefficient n. Because it is difficult to measure time directly, it is usually to measure the phase of continuous wave, which is called a phase finder. Of course there are also pulse rangefinders, typically WILDD-3000. It should be noted that the 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.

Does the plane of the measured object have to be perpendicular to the light?

Usually precision distance measurement requires the cooperation of total reflection prisms, and the distance meter used for house measurement directly uses smooth wall reflection measurement, mainly because the distance is relatively short, and the signal intensity of light reflection is large enough. Therefore, it must be vertical, otherwise the return signal is too weak to obtain an accurate distance.

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

Generally, it is also possible. In actual projects, a thin plastic plate is used as a reflecting surface to solve the serious problem of diffuse reflection.

The difference between ultrasonic ranging and laser ranging

Ultrasonic ranging accuracy is low, and it is rarely used at present. The accuracy of the laser rangefinder can reach an error of 1 mm, which is suitable for various high-precision measurements.

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