1. There are three points to consider when purchasing a laser rangefinder;
1. Only need to measure the distance within a few meters or ten meters, and the accuracy requirements are not high.
It is recommended to use an "ultrasonic rangefinder". The measurement effect of the ultrasonic rangefinder is greatly affected by the environment, and the stability and directionality are worse than that of the laser rangefinder, but the price is relatively cheap, which 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 a "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 reflector to achieve the expected range and effect.
3. The measurement distance is far, and it is mostly used for outdoor use.
2. Pay attention to what aspects can you buy a suitable laser rangefinder
1. Measuring range. 2. Measurement accuracy. 3. The occasion of use. The laser rangefinder is basically divided into the following situations: a) Only need to measure the distance within a few meters or more than ten meters, and the accuracy requirements are not high. Suggestion--"ultrasonic rangefinder" can be used. Remarks - The measurement effect of the ultrasonic rangefinder is greatly affected by the environment, and the stability and directionality are worse than that of the laser rangefinder, but the price is relatively cheap, suitable for indoor measurement. b) The measurement distance is not long, and it is mostly used indoors, with high precision requirements. Suggestion - Optional "Handheld Laser Rangefinder". Remarks--Handheld laser rangefinder is most suitable for indoor use, and the measurement accuracy and effect are very good. (If the user needs to perform detection in an outdoor environment, it is recommended to use a professional laser sight and reflector to achieve the expected range and effect.) c) The measurement distance is long, and it is mostly used for outdoor use.
3. The measurement principle and method of the laser rangefinder;
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 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. Must the plane of the object to be measured 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 distance cannot be obtained.
3. Is it OK if the plane of the measured object is 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. Ultrasonic ranging accuracy is relatively low.
4. Routine maintenance of the laser rangefinder;
①Check the appearance of the instrument frequently and remove the dust, grease, mildew, etc. on the surface in time.
②Use a soft dry cloth when cleaning the eyepiece, objective lens or laser emission window. It is strictly forbidden to scratch with hard objects, so as not to damage the optical performance.
③ This machine is a high-precision instrument integrating light, machine and electricity. It should be handled with care during use, and it is strictly forbidden to squeeze or drop it from a high place to avoid damage to the instrument.
