Principle Difference between Ultrasound and Laser Range Finder

Ultrasound rangefinder/ranging sensor is based on the known speed of ultrasonic propagation in the air, and the characteristics of ultrasonic reflection when it encounters obstacles. Ultrasound transmitter transmits ultrasound in a certain direction. At the same time, it starts timing. Ultrasound spreads in the air. When it encounters obstacles on the way, it returns immediately. When the ultrasonic receiver receives the reflected wave, it immediately interrupts the timing. Then the actual distance between the transmitting point and the obstacle is calculated according to the time difference between transmitting and receiving. Leave. By continuously detecting the echoes reflected by obstacles after the generated waves are emitted, the time difference T between transmitting and receiving the echoes is measured, and then the distance L is calculated. The ultrasonic range finder/sensor consists of an ultrasonic generating circuit, an ultrasonic receiving and amplifying circuit, a counting and displaying circuit.

Laser Rangefinder/ranging sensor is a kind of sensor which uses laser to measure the distance of target accurately. The laser rangefinder emits a very fine laser beam to the target while it works. The laser beam reflected by the target is received by the photoelectric element. The time from the launch to the reception of the laser beam is measured by the timer, and the distance from the observer to the target is calculated. Laser rangefinder is the most widely used rangefinder at present. Laser rangefinder/rangefinder can be classified as hand-held laser rangefinder/rangefinder and telescope laser rangefinder/rangefinder.