The Basics of Laser Range Finder Measurement
1. What is the principle of using infrared ranging or laser ranging?
The principle of ranging can basically be attributed to measuring the time required for light to go back and forth to the target, and then calculate the distance D through the speed of light c=299792458m/s and the atmospheric refractive index n.
Because it is difficult to measure time directly, it is usually to measure the phase of continuous wave, which is called phase measuring range finder.
It should be noted that phase measurement does not measure the phase of infrared or laser, but the phase of the signal modulated on infrared or laser.
The construction industry has a handheld laser distance meter for house surveying that works on the same principle.
2. Must the plane of the measured object be perpendicular to the light?
Usually precision distance measurement requires the cooperation of a total reflection prism, while the rangefinder used for house measurement directly measures with smooth wall reflection, mainly because the distance is relatively short and the signal strength of the light reflected back is large enough.
It can be known from this that it must be vertical, otherwise the return signal is too weak and the maximum distance cannot be obtained.
3. Is it possible if the plane of the measured object is diffuse reflection?
It is usually possible. In actual engineering, a thin plastic plate is used as a reflective surface to solve the problem of serious diffuse reflection.
4. The accuracy of ultrasonic ranging is relatively low, and it is rarely used now.
Measuring range, measuring accuracy, application occasions.
1. Only need to measure the distance within a few meters or more than ten meters, and the accuracy requirement is not high.
It is recommended to use "Ultrasonic Range Finder". The measurement effect of the ultrasonic range finder is greatly affected by the environment, and its stability and directionality are worse than that of the laser range finder, but the price is relatively cheap, and it is suitable for indoor measurement.
2. The measurement distance is not long, and it is mostly used indoors with high precision requirements.
It is recommended to purchase "Handheld Laser Rangefinder". The handheld laser rangefinder is suitable for indoor use, and the measurement accuracy and effect are very good. If the user needs to detect in an outdoor environment, it is recommended to use a professional laser sight and a reflector to achieve the expected range and effect. ,
3. The measurement distance is relatively long, and it is mostly used for outdoor use.
