Routine maintenance and principles of laser rangefinding
Optical rangefinder maintenance:
① often check the appearance of the instrument in time to remove the surface of the dust and dirt, grease, mildew, etc..
② Clean the eyepiece, objective lens or laser emission window should use a soft dry cloth. Strictly prohibit the use of hard objects, so as not to damage the optical properties.
③ This machine is an optical, mechanical and electrical integration of high-precision instruments, the use of which should be carefully and gently placed, and is strictly prohibited from extrusion or falling from a height, in order to avoid damage to the instrument.
Problems needing attention when using: laser rangefinder can not be aimed at the human eye direct measurement, to prevent harm to the human body. At the same time, the vibration meter general laser rangefinder does not have a waterproof function, so you need to pay attention to waterproof. So the advantage of the place of production that can be waterproof and fogproof, equipped with jungle tree branches and leaves painted colours.
The laser does not have the function of anti-drop, so the laser rangefinder is easy to drop the luminescent device.
Principle
1. Can measure the object plane for diffuse reflection
Usually can also be used, the actual engineering will be used as a thin plastic plate reflective surface to solve the problem of serious diffuse reflection.
2. The use of infrared ranging or laser ranging principle
The principle of distance measurement can be basically reduced to measuring the time required for the light to travel to and from the target, and then through the speed of light c = 299792458m/s and the atmospheric refraction coefficient n to calculate the distance D. Due to the difficulty of measuring the time directly, it is usually determined by the phase of the continuous wave, known as phasor rangefinder. Of course, there are also pulsed rangefinders, typically WILD's DI-3000.
It is important to note that phasorimetry does not measure the phase of the infrared or laser, but rather the phase of the signal modulated on top of the infrared or laser. The construction industry has a handheld laser rangefinder for housing measurement, which works on the same principle.
3. Laser rangefinder accuracy can reach 1 mm error, suitable for a variety of high-precision measurement purposes.
Laser rangefinders need to pay attention to the use of the problem: laser rangefinders can not be aimed at the human eye direct measurement, to prevent harm to the human body. At the same time, the vibration meter general laser rangefinder does not have a waterproof function, so you need to pay attention to waterproof. The United States Rio Porter laser rangefinder, due to the local United States mainly for outdoor shou hunting enthusiasts, so the advantage of making the place is waterproof and fogproof, with jungle tree branches and leaves painted colours.
4. The plane of the measured object must be perpendicular to the light.
Usually precision ranging needs to be fully reflective prisms with the housing measurement with the rangefinder, directly to the smooth wall reflection measurement, mainly because the distance is relatively close, the light reflected back to the signal strength is large enough. With this can be known, must be vertical, otherwise the return signal is too weak will not be able to get the distance.
5. Ultrasonic ranging accuracy is relatively low, use less.
