Routine care and the laser range finders principle
Laser rangefinder maintenance:
① Frequently check the appearance of the instrument and remove dust, grease, mildew, etc. on the surface in time.
② When cleaning the eyepiece, objective lens or laser emission window, use a soft dry cloth. 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, machinery and electricity. It should be handled with care during use. It is strictly forbidden to squeeze or drop from a high place to avoid damage to the instrument.
Problems that need to be paid attention to when using: The laser rangefinder cannot be aimed at the human eye for direct measurement to prevent damage to the human body. At the same time, the general laser rangefinder of the vibration meter is not waterproof, so it needs to pay attention to waterproofing. , so the advantage of the production is that it can be waterproof and anti-fog, and it is equipped with jungle tree branches and leaves.
The laser does not have the function of anti-drop, so the laser rangefinder is easy to break the light emitter.
principle
1. The object plane can be measured as 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.
2. 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 refraction coefficient 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. Of course, there are also pulse range finders, typically WILD's DI-3000.
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.
3. The accuracy of the laser rangefinder can reach 1 mm error, which is suitable for various high-precision measurement purposes.
Problems that need to be paid attention to when using the laser rangefinder: The laser rangefinder cannot be aimed at the human eye for direct measurement to prevent damage to the human body. At the same time, the general laser rangefinder of the vibration meter is not waterproof, so it needs to pay attention to waterproofing. The American Leoport laser rangefinder is mainly suitable for outdoor hunting enthusiasts in the United States, so the advantage of its production is that it can be waterproof and anti-fog, and it is equipped with jungle tree branches and leaves.
4. The plane of the measured object must 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 distance cannot be obtained.
