A brief introduction to the function and characteristics of the phase method range finder
Under the given modulation and standard atmospheric conditions, the frequency c/(4πf) is a constant. At this time, the measurement of the distance becomes the measurement of the number of half-wavelengths contained in the survey line and the measurement of the fractional part less than half-wavelength, that is, N Or φ, due to the development of modern precision machining technology and radio phase measurement technology, the measurement of φ has reached a very high accuracy.
In order to measure the phase angle φ that is less than π, different methods can be used to measure it. Usually, delay phase measurement and digital phase measurement are the most widely used. At present, short-range laser rangefinders use the principle of digital phase measurement to obtain φ.
As mentioned above, in general, the phase-type laser rangefinder uses a laser beam with a modulated signal that is continuously emitted. In order to obtain high-precision ranging, it is necessary to configure a cooperative target. The current handheld laser rangefinder is a pulsed laser rangefinder. Another new type of rangefinder in the instrument, it is not only small in size and light in weight, but also uses digital phase measurement pulse broadening and subdivision technology, which can achieve millimeter-level accuracy without the need for a cooperative target. The measuring range has exceeded 100m, and it can quickly and accurately directly Show distance.
Wide application of laser range finder
Laser rangefinders are widely used in topographical surveys, battlefield surveys, tanks, aircraft, ships and artillery to measure the distance of targets, and to measure the height of clouds, aircraft, missiles and artificial satellites. It is an important technical equipment to improve the accuracy of high tanks, aircraft, ships and artillery. Due to the continuous reduction in the price of laser range finders, laser range finders have gradually begun to be used in industry, which can be widely used in industrial measurement and control, mines, ports and other fields.
