1. Using 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 to and from 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 the continuous wave, which is called a phase-measuring rangefinder. Of course, there are also pulsed rangefinders.
It should be noted that the phase measurement does not measure the phase of the infrared or laser, but measures the phase of the signal modulated on the infrared or laser. The construction industry has a handheld laser rangefinder for house measurements that works the same way.
2. The plane of the measuring object must be perpendicular to the light
Usually, precise ranging requires the cooperation of a total reflection prism, and the rangefinder used for house measurement is directly measured by reflection from a smooth wall, mainly because the distance is relatively close, and the signal strength of the reflected light is large enough. It can be known from this that it must be vertical, otherwise the return signal is too weak and the precise distance cannot be obtained.
3. The plane of the object can be measured as diffuse reflection
Usually it is also possible. In practical projects, a thin plastic plate will be used as a reflective surface to solve the problem of serious diffuse reflection.
4. The entertainment-grade products of the pulse method laser rangefinder can achieve a display accuracy of 1 meter and a measurement accuracy of ±1m, while the measurement-grade products have a display accuracy of 0.1m and a measurement accuracy of ±0.15m.
5. The accuracy of the phase laser rangefinder can reach 1 mm error, which is suitable for various high-precision measurement purposes.
GVDA Laser rangefinder GD1000B Black color:
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