The principle of ultrasonic ranging is to use the propagation speed of ultrasonic waves in the air to be known, measure the time when the sound waves are reflected from obstacles after being transmitted, and calculate the actual distance from the transmitting point to the obstacle according to the time difference between transmitting and receiving. The ultrasonic distance meter is composed of ultrasonic generating circuit, ultrasonic receiving and amplifying circuit, counting and display circuit.
A laser rangefinder is an instrument that uses a laser to accurately measure the distance to a target. The laser rangefinder emits a very thin laser beam to the target when it is working, and the laser beam reflected by the target is received by the photoelectric element.
The difference between ultrasonic rangefinder and laser rangefinder
1. In terms of accuracy, the measurement accuracy of the ultrasonic rangefinder is at the centimeter level, and the measurement accuracy of the laser rangefinder is at the millimeter level;
2. In terms of measurement range, the measurement range of ultrasonic rangefinders is usually within 80 meters, while the measurement range of handheld laser rangefinders can be up to 200 meters, and the measurement range of laser rangefinders can be hundreds of kilometers. Even farther (laser ranging telescopes usually measure with an accuracy of 1 meter or tens of centimeters).
3. The ultrasonic range finder is easy to report errors. Because the ultrasonic range finder emits sound waves and has the characteristics of fan-shaped emission of sound waves, when there are many obstacles where the sound waves pass, more sound waves are reflected back, and there are more interferences, and it is easy to report errors. The laser rangefinder is a very small beam of laser that is emitted and then returned, so as long as the beam can pass, there is almost no interference.
4. The price of ultrasonic rangefinders ranges from tens of yuan to several hundred yuan, and the price of laser rangefinders ranges from several hundred yuan to several thousand or tens of thousands of yuan, depending on the accuracy and distance.
