The new laser range finder uses two methods to determine distance
A tool for measuring length or distance, the rangefinder can be used in conjunction with modules or equipment for measuring angles to measure characteristics like angles and areas. Range finders come in a variety of shapes and sizes. They typically consist of an objective lens, an eyepiece, a display (which may or may not be built-in), a battery, and other components.
Additionally, several laser pulses can be sent by laser range finders to use the Doppler effect to determine whether an object is moving toward or away from a light source.
Principle of range finder
The two main methods used by laser range finders to determine distance are the pulse method and the phase approach. The pulse technique of ranging works as follows: the range finder emits a laser, which is reflected by the object being measured and then returned to the range finder. The range finder then simultaneously measures the time the laser travels back and forth. The distance between the rangefinder and the object being measured is half of the product of the speed of light and the round-trip time. By using the pulse method, distances are typically measured with an accuracy of +/-1 meter. Additionally, this sort of rangefinder often has a measurement blind zone of roughly 15 meters.
A technique for measuring distance using light waves is laser distance measurement. The distance D between places A and B can be used to describe the following if light moves through the air at a speed of c and traverses between them in time t.
D=ct/2
In the formula:
D--the distance between two points A and B of the station;
c - the speed of light in the atmosphere;
t - the time required for light to go back and forth between A and B once.
The aforementioned formula demonstrates that calculating the distance between A and B actually involves calculating the light's propagation time, or t. Laser range finders can typically be classified into two measurement types: pulse type and phase type, depending on the various techniques used to measure time.
Phase Laser Rangefinder
In order to calculate the distance represented by the phase delay according to the wavelength of the modulated light, the phase laser rangefinder modulates the amplitude of the laser beam using the frequency of the radio band, measures the phase delay produced by the modulated light traveling back and forth to the survey line once, and then converts the distance represented by the phase delay. In other words, the time needed for the light to pass back and forth via the measuring line is measured indirectly, as depicted in the image.
Precision distance measurement often uses phase laser rangefinders. This rangefinder has a reflector known as a cooperative target because of its high precision, which is typically at the millimeter level, in order to efficiently reflect the signal and confine the measured target to a precise point consistent with the accuracy of the instrument. mirror.
