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What are the different classifications of laser ranging sensors?
There are two types of laser ranging sensors: triangulation and time-of-flight.There are three types of time-of-flight laser ranging: pulsed laser ranging, phase-based laser ranging and interferometry laser ranging.
Pulsed laser rangefinder technology takes advantage of the fact that the laser pulse energy is relatively concentrated in time and the instantaneous power is very large (usually up to watts). In the case of cooperative targets, pulsed laser ranging can achieve edge measurements, and universal pulsed laser ranging sensors can measure distances of tens or even tens of thousands of kilometers, achieving accuracy of more than 10 centimeters. When performing a range from a few kilometers to dozens of kilometers, the distance measurement can be performed only by diffusing the signal to the pulse tube using the measured target, even if no cooperative target is used.The disadvantage is that the absolute ranging accuracy is not very high.
The phase laser ranging sensor USES the high frequency sinusoidal signal of fixed frequency to continuously modulate the luminous intensity of the laser source and measure the phase delay generated by the modulating laser back and forth once.The measured distance is calculated by phase delay.
Phase-based ranging measures the time of signal propagation indirectly by measuring the phase delay of the continuous amplitude modulated signal propagating back and forth over the distance to be measured so as to obtain the measured distance.The method has high measurement accuracy, usually at the millimeter scale.
The interferometric ranging method is also a phase ranging method, which is different from the general phase ranging method in that it does not measure the distance by measuring the phase of the laser modulated signal, but by measuring the distance by measuring the change of the interference fringe.
Detailed explanation of the operation method of laser rangefinder
Laser rangefinder usually USES two methods to measure distance: pulse method and phase method.
The pulse rangefinder works like this: the laser emitted by the rangefinder is reflected from the measured object and then received by the rangefinder, which records the time of the laser's reciprocation.Half the product of the speed of light and the time to return is the distance between the rangefinder and the object being measured.
The accuracy of measuring distance by pulse method is generally about +/-1 meter.Other, the blind area of this kind of rangefinder is about 15 meters.
How to use the rangefinder:
Firstly, arrange theodolite on the station, center and level it, place the main equipment of the rangefinder on the theodolite bracket, lock it with the fixing screw of the coupling, insert the battery into the bottom of the main engine and fasten it.Arrange the reflector at the policy point, center, level, and point the mirror toward the host.
Aim the center of the board with the cross thread of theodolite, and measure the perpendicular Angle alpha.Together, observe and record temperature and barometer readings.To observe the vertical Angle, air temperature and air pressure, the purpose is to correct the tilt, temperature and air pressure of the distance measured by the rangefinder, so as to get the correct horizontal distance.
Press the "PWR" key on the power supply to start the machine, the host will self-check and flash the original set temperature, pressure and prism constant value, and the self-check will flash "good" in the future.
To correct the set value, press "TPC" and enter the temperature, pressure or prism constant (usually through "ENT" key and digital key).In general, just use the same kind of reflector, the prism constant is the same, and the temperature and pressure may be different for each observation, which needs to be set from scratch.
Adjust the hand wheel (or theodolite horizontal fretting screw) and the pitch fretting screw of the main engine by scheduling the altimeter axis, so that the rangefinder telescope can accurately aim at the prism center. n the case of flashing "good", accurate aiming can also be judged according to the sound and motion of the buzzer. The stronger the signal is, the bigger the movement and motion is. The micro-moving rangefinder from left to right makes the maximum movement and motion of the buzzer.
Application field of laser rangefinder
Laser rangefinders are now widely used in the following fields: electricity, water conservancy, communications, environment, architecture, geology, police, fire, blasting, Marine, railway, counter-terrorism/military, agriculture, forestry, real estate, leisure/field sports, etc.