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What applications do laser rangefinders have?
Laser is widely used in the field of detection, and the technology content is very rich.Laser ranging is one of the earliest USES of laser.This is because the laser has a strong direction, high brightness, monochromaticity and many other advantages.The basic principle of measuring the distance using the time of laser transmission is to determine the distance of the target through the time needed to measure the laser to and from the target.
Now, in the method of automatic detection and control, in addition to ultrasonic sensor and ordinary photoelectric sensor, a new method that can handle long distance measurement and inspection is added -- laser distance sensor at transmission time.It provides flexibility for a variety of different applications, which can include the following
(1) equipment positioning.
(2) measure the material level of the material bag.
(3) Measure the distance and height of the objects on the conveyor belt.
(4). Measure the diameter of the log.
(5). Maintain overhead cranes from collisions.
(6). Error-free inspection occasions.
The laser rangefinder generally adopts two methods to measure the distance: pulse method and phase method.The pulse range finder works like this: the laser light emitted by the laser range finder is reflected from the measured object and then absorbed by the laser range finder, which records the time of the laser back and forth.Half the speed of light times the time to go back and forth is the distance between the laser rangefinder and the measured object.The accuracy of measuring distance by pulse method is generally about +/- 1 meter.Other, this kind of rangefinder measurement blind area is generally about 15 meters.
Four points about how to use laser rangefinder
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.