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Summary: A laser rangefinder is an instrument that uses specific parameters of a modulated laser to measure the distance to a target. The measuring range of the laser rangefinder is 3.5 to 5000 meters.
Release time:
2020/12/30
laser range finderIt is an instrument that uses specific parameters of a modulated laser to measure the distance to a target. The measuring range of the laser rangefinder is3.5To5000Meters. According to the ranging method, it is divided into phase method rangefinder and pulse method rangefinder. The pulsed laser rangefinder emits a beam or a series of short pulsed laser beams at the target, and the photoelectric element receives the laser light reflected by the target. The timer measures the time from the launch to the reception of the laser beam and calculates the distance from the observer to the target. The phase method laser range finder detects the distance by detecting the phase difference that occurs when the emitted light and the reflected light travel in the space. The laser rangefinder is light in weight, small in size, simple to operate, fast and accurate, and its error is only 1/5 to 1/100 that of other optical rangefinders.
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1.The principle of using infrared ranging or laser ranging
The principle of distance measurement can basically be attributed to the measurement of the time required for light to travel to and from the target, and then pass through the speed of light.c = 299792458m / sand atmospheric refractive indexnto calculate the distanceD. Since it is difficult to measure time directly, the phase of the continuous wave is usually measured, which is called a phase measuring rangefinder. Of course, there are pulse rangefinders.
It should be noted that the phase measurement is not a measurement of the phase of the infrared or laser light, but a measurement of the phase of a signal modulated on the infrared or laser light. There is a hand-held laser rangefinder for house measurement in the construction industry, which works on the same principle.
2.The plane of the measured object must be perpendicular to the light
Generally, accurate ranging requires the cooperation of a total reflection prism. The rangefinder used for house measurement directly uses smooth wall reflection to measure, which is mainly because the distance is relatively short and the signal intensity of light reflection is large enough. From this we can know that it must be vertical, otherwise the return signal is too weak and the precise distance cannot be obtained.
3.Can measure the diffuse reflection of the surface of the object
Usually, this is also possible. In practical engineering, a thin plastic plate is used as a reflective surface to solve the serious problem of diffuse reflection.
4.Recreational grade products of pulsed laser rangefinders can reach1meter display accuracy, ±1meters of measurement accuracy, measurement grade products,0.1meter display accuracy and ±0.15Meters of measurement accuracy.
5.The accuracy of the phase laser rangefinder can reach1 mmerror, suitable for a variety of high-precision measurement purposes.
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