Laser range finder related questions:
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 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.
2. Must the plane of the measured object 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 maximum distance cannot be obtained.
3. Is it possible if the plane of the measured object is 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.
4. What is the difference between ultrasonic ranging and laser ranging?
Ultrasonic ranging accuracy is relatively low, and it is rarely used now. The accuracy of the laser rangefinder can reach 1 mm error, suitable for various high-precision measurement purposes
Problems needing attention when using laser range finder
Precautions for using the laser rangefinder:
①The laser rangefinder cannot be aimed directly at the human eye for direct measurement to prevent damage to the human body.
②The general laser range finder is not waterproof, so you need to pay attention to waterproofing.
③The laser does not have the function of anti-drop, so the laser rangefinder is easy to break the light emitter.
Maintenance of laser range finder:
① Frequently check the appearance of the instrument and remove dust, grease, mildew, etc. on the surface in time.
②When 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.
③This 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.
