Routine maintenance and principles of laser rangefinders
Optical rangefinder maintenance:
① often check the appearance of the instrument in a timely manner to remove the surface of the dust and dirt, grease, mold and so on.
② Clean the eyepiece, objective lens or laser emission window should use a soft dry cloth. Strictly prohibit the use of hard objects scratches, 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 high place, so as not to damage the instrument.
Problems to be noted when using: 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. So the advantage of the production of the place that can be waterproof and anti-fog, equipped with jungle tree branches and leaves coated with color.
The laser does not have the function of anti-drop, so the laser rangefinder is easy to drop the luminescent device.
1. Can measure the object plane for diffuse reflection
Usually can also be used, the actual project will use a thin plastic plate as a 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 basically be summarized as the measurement of light round-trip time to 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 direct measurement of time, usually determines 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 hand-held laser rangefinder for housing measurement, which works on the same principle.
3. Laser rangefinder accuracy can reach 1 millimeter error, suitable for a variety of high-precision measurement purposes.
Laser rangefinder need to pay attention to the use of the problem: 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. The United States Rio Porter laser rangefinder, due to the United States local mainly for outdoor shou hunting enthusiasts, so the advantage of making the place that can be waterproof anti-fog, equipped with jungle tree branches and leaves painted colors.
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, the use of less.
