Functional characteristics of the phase method rangefinder in brief
In the given modulation and standard atmospheric conditions, the frequency c/(4πf) is a constant, at this time the measurement of distance becomes the measurement of the number of half-wavelengths contained in the measurement line and less than half-wavelength measurement of the fractional part of the measurement of N or φ, due to the recent development of precision machining technology and radio phase measurement technology, has enabled the measurement of φ to reach a high degree of accuracy.
In order to measure the phase angle φ of less than π, can be measured by different methods, usually the most widely used is the delayed phase measurement and digital phase measurement, the current short-range laser rangefinder are used to obtain the φ of the digital phase measurement principle.
From the above mentioned general circumstances phase type laser ranging using continuous emission of laser beams with modulation signals, in order to obtain high accuracy ranging also need to configure the cooperation target, and the current introduction of handheld laser rangefinder is a pulse laser rangefinder in another new rangefinder, it is not only small, light weight, but also the use of digital phasing pulse spreading subdivision technology, without the need to cooperate with the target to achieve millimetre-level accuracy, measuring range has been More than 100m, and can quickly and accurately display the distance directly.
Structure of the rangefinder
Rangefinder is a tool for measuring length or distance, and can be combined with goniometric devices or modules to measure angles, areas and other parameters.
Rangefinders come in many forms, usually a long cylinder consisting of an objective lens, an eyepiece, a display unit (which can be built-in), and a battery.
Laser rangefinders can also emit multiple laser pulses to determine whether an object is moving away from or approaching a light source through the Doppler effect.
