Since the birth of lasers, lasers have been widely used in military, medical, communications and other fields because of their good collimation and high energy. , a mirror-like retroreflector device was installed on the lunar surface, and a laser was emitted to the device on the earth, and humans measured the precise distance between the earth and the moon.
Lidar ranging technology generally has three methods: triangular ranging method, PTOF ranging method and AMCW (amplitude modulated continuous wave ranging method.
1. Trigonometry
Trigonometry is based on the principle of triangular geometry, hit a beam of light source on the object to be measured, and calculate the distance of the object to be measured by measuring the imaging position of the reflected light in the area array or line array detector.
2. PTOF ranging method
The core principle of PTOF is to shoot a laser beam with a very short time on the detection object, and by directly measuring the flight time of the laser emission, hitting the detection object and then returning to the detector, the distance from the detector to the measured object is reversed.
3. AMCW (Amplitude Modulated Continuous Wave) ranging method
AMCW modulates the intensity of the light wave (such as sine wave or triangular wave, etc.), so that the light wave forms a phase difference on the light intensity waveform in the process of returning to the detector after being projected on the object, then by measuring the phase difference, it can be obtained indirectly The time of flight of light, and thus the flight distance.
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