Principle Of Infrared Ranging Or Laser Ranging
The principle of distance measurement can be basically summarized as measuring the time required for light to travel back and forth to the target, and then calculating the distance D through the speed of light c=299792458m/s and the atmospheric refractive index n. Due to the difficulty of directly measuring time, it is usually necessary to determine the phase of continuous waves, which is called a phase measuring rangefinder. Of course, there are also pulse rangefinders. It should be noted that phase measurement does not measure the phase of infrared or laser, but rather the phase of the signal modulated on the infrared or laser. There is a handheld laser rangefinder in the construction industry used for measuring houses, and its working principle is the same as this.
2. The plane of the object being measured must be perpendicular to the light rays
Usually, precision distance measurement requires the use of a total reflection prism, while the distance measuring instrument used for house measurement directly measures the reflection of smooth walls, mainly because the distance is relatively close and the signal strength reflected back by the light is strong enough. It can be inferred that it must be perpendicular, otherwise the return signal will be too weak to obtain accurate distance.
3. It can measure whether the object plane is diffuse reflection
It is usually possible, but in practical engineering, thin plastic sheets are used as reflective surfaces to solve the problem of severe diffuse reflection.
4. Pulse laser rangefinder entertainment grade products can achieve a display accuracy of 1 meter and a measurement accuracy of ± 1 meter. Measurement grade products have a display accuracy of 0.1 meters and a measurement accuracy of ± 0.15 meters.
5. The accuracy of the phase laser rangefinder can reach 1 millimeter error, making it suitable for various high-precision measurement purposes.
