Daily maintenance and the principle of the laser range finder
Maintenance of optical rangefinder:
① Regularly inspect the appearance of the instrument and promptly remove surface dust, dirt, grease, mold, etc.
② When cleaning eyepieces, objectives, or laser emission windows, a soft dry cloth should be used. It is strictly prohibited to scratch with hard objects to avoid damaging the optical performance.
③ This machine is a high-precision instrument that integrates optics, mechanics, and electronics. It should be handled with care during use and is strictly prohibited from being squeezed or dropped from a height to avoid damaging the instrument.
Attention when using: The laser rangefinder cannot be aimed at the human eye for direct measurement to prevent harm to the human body. Meanwhile, vibration meters generally do not have waterproof functions for laser rangefinders, so it is necessary to pay attention to waterproofing., So the advantage of the production is that it can be waterproof and fog proof, and is equipped with colorful jungle tree branches and leaves.
Laser does not have anti drop function, so laser rangefinders are prone to damage the emitters.
principle
1. It can be measured that the plane of the object is diffuse reflection
Usually, it is also possible to use thin plastic sheets as reflective surfaces in practical engineering to solve the problem of severe diffuse reflection.
2. The principle of using infrared ranging or laser ranging
The principle of distance measurement can be 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 atmospheric refractive index n. Due to the difficulty of directly measuring time, it is usually to measure the phase of continuous waves, which is called a phase measuring rangefinder. Of course, there are also pulse rangefinders, typical of which are WILD's DI-3000.
It should be noted that phase measurement is not about measuring the phase of the infrared or laser, but rather measuring the phase of the signal modulated on the infrared or laser. There is a handheld laser rangefinder used in the construction industry for house measurement, which works on the same principle.
3. The accuracy of the laser rangefinder can reach an error of 1 millimeter, making it suitable for various high-precision measurement purposes.
Attention when using a laser rangefinder: The laser rangefinder cannot be aimed at the human eye for direct measurement to prevent harm to the human body. At the same time, vibration meters and laser rangefinders generally do not have waterproof functions, so it is necessary to pay attention to waterproofing. The American Leopold laser rangefinder, which is mainly suitable for outdoor hunting enthusiasts in the United States, has the advantage of being waterproof and fog proof, and is equipped with colorful jungle tree branches and leaves.
4. The plane of the measured object must be perpendicular to the light rays
Usually, precision ranging requires the cooperation of a total reflection prism, and the rangefinder used for house measurement directly reflects the measurement from a smooth wall surface, 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 the distance.
5. The accuracy of ultrasonic distance measurement is relatively low, and it is rarely used.
