What is the principle of using infrared ranging or laser ranging?
The principle of ranging can basically be attributed to measuring the time required for light to travel to and from the target, and then calculate the distance D by the speed of light c = 299792458m/s and the atmospheric refraction coefficient n. Because it is difficult to measure time directly, it is usually to measure the phase of the continuous wave, which is called a phase-measuring rangefinder. Of course, there are also pulsed rangefinders. Phase measurement does not measure the phase of the infrared or laser, but the phase of the signal modulated on the infrared or laser.
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