How the Lightweight Laser Rangefinder Tester Works
The laser range finder is a kind of infrared pulse that is invisible and harmless to human eyes after aiming at the object, and then calculates the accurate distance of the target by continuously measuring the time of the pulse going back and forth. The laser measurement distance mainly depends on the reflection degree of the target object. Generally, the effect of traffic signs is better. Because the color of the target, the degree of surface treatment, the size, and the shape of the target will directly affect the reflectivity of the object and thus affect the distance of ranging. In addition to adopting advanced technology, this product is more superior than other products. It has a simple, lightweight and artistic design. Because it has such superior characteristics, it is widely used in industrial inspection, power sector measurement, railway surveying and mapping industries. Like golf, building surveying and design, fire protection systems, and other outdoor sports surveying.
Principle
1. Using the principle of infrared ranging or laser ranging
The principle of ranging can basically be attributed to measuring the time required for light to travel to and from the target, and then calculate the distance D by 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 phase measurement does not measure the phase of the infrared or laser, but 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 object to be measured must be perpendicular to the light
Usually, precise ranging requires 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 distance cannot be obtained.
3. The plane of the object can be measured as diffuse reflection
Usually, it is also possible. In practical projects, thin plastic plates will be used as reflective surfaces to solve the problem of serious diffuse reflection.
4. The entertainment-grade products of the pulsed laser rangefinder can achieve a display accuracy of 1 meter, a measurement accuracy of ±1m, and a measurement-grade product 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.
