The Difference Between Laser Sensor and LiDAR
Author： Neuvition, IncRelease time：2021-07-09 02:35:38
1.Laser sensor: First, a laser diode is aimed at the target to emit laser pulses. The laser light is scattered in all directions after being reflected by the target. Part of the scattered light returns to the sensor receiver and is imaged on the avalanche photodiode after being received by the optical system. The avalanche photodiode is an optical sensor with an internal amplification function, so it can detect extremely weak light signals. Record and process the elapsed time from when the light pulse is sent to when it is received, and then the target distance can be determined.
- The laser sensor must measure the transit time extremely accurately because the speed of light is too fast. For example, the speed of light is about 3X10^8m/s. To achieve a resolution of 1mm, the electronic circuit of the ranging sensor must be able to distinguish the following extremely short time: 0.001m/(3X10^8m/s)=3ps The 3ps time is too high for electronic technology, and the cost is too high to realize. But today’s laser sensors cleverly avoid this obstacle, using a simple statistical principle, that is, the law of averaging to achieve a resolution of 1mm, and can ensure the response speed. The long-distance laser rangefinder emits a very thin laser beam to the target when it is working, and the photoelectric element receives the laser beam reflected by the target. The timer measures the time from emission to reception of the laser beam, and calculates the distance from the observer to the target. ; The imaging of the LED white light speedometer is on the internal integrated circuit chip CCD of the instrument. The performance of the CCD chip is stable, the working life is long, and it is not affected by the working environment and temperature. Therefore, the measurement accuracy of the LED white light speedometer is guaranteed, and the performance is stable and reliable.
- LiDAR is a radar system that emits laser beams to detect the position and speed of the target. Its working principle is to transmit a detection signal (laser beam) to the target, and then compare the received signal (target echo) from the target with the transmitted signal. After proper processing, relevant information about the target can be obtained, such as Target distance, azimuth, altitude, speed, attitude, even shape and other parameters, detect, track and identify aircraft, missiles and other targets. It consists of a laser transmitter, an optical receiver, a turntable, and an information processing system. The laser converts electrical pulses into light pulses and emits them. The optical receiver then restores the light pulses reflected from the target to electrical pulses and sends them to the display.