An instrument for measuring the size of a building. What is it called?
In general, precision ranging requires a total reflectance prism, while a range finder for house measurements is directly reflected on a smooth wall surface, mainly because the distance is relatively near and the intensity of the signal reflected back is large enough. With this, you must know that it must be vertical, otherwise the return signal is too weak to get the exact distance.
Principle:1., the use of infrared ranging or laser ranging principleThe principle of ranging can be basically reduced to the time required to measure the light to and from the target, and then the distance D is calculated by the speed of light, C, =299792458m/s, and atmospheric refraction coefficient n. Because the time of direct measurement is difficult, the phase of continuous wave is usually measured, which is called phase measuring range finder. Of course, there are pulse range finders, typically WILD's DI-3000.It should be noted that the phase measurement is not to measure the phase of the infrared or laser, but to measure the phase of the signal that is modulated on the infrared or laser. The construction industry has a hand-held laser rangefinder for house measurements, which works the same way.
Laser range finder is an instrument that uses laser to measure the distance of target accurately. The laser rangefinder emits a beam of very fine laser to the target in the job, the laser beam by the optical element receives the reflected laser beam, the timer determination time from transmitting to receiving, calculating the distance from the observer to the target. Laser range finder is light weight, small size, simple operation, fast and accurate, and its error is only 1/5 to hundreds of other optical range finder.
