The difference between an ultrasonic distance meter and a laser distance meter
The principle of ultrasonic ranging is to use the known propagation speed of ultrasonic waves in the air, measure the time it takes for the sound waves to reflect back when encountering obstacles after being transmitted, and calculate the actual distance from the transmitting point to the obstacle based on the time difference between transmitting and receiving. The ultrasonic distance meter is composed of an ultrasonic generating circuit, an ultrasonic receiving amplifier circuit, and a counting and display circuit.
A laser rangefinder is an instrument that uses laser light to accurately measure the distance to a target. When the laser rangefinder is working, it emits a very thin laser beam towards the target. 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.
1. In terms of accuracy, the measurement accuracy of ultrasonic rangefinders is centimeter-level, and the measurement accuracy of laser rangefinders is millimeter-level;
2. In terms of measuring range, the measuring range of ultrasonic rangefinders is usually within 80 meters, while the measuring range of handheld laser rangefinders can be up to 200 meters, and the measuring range of laser ranging telescopes can be hundreds of kilometers. Even further (the measurement accuracy of laser ranging telescopes is usually 1 meter or tens of centimeters).
3. Ultrasonic range finders are easy to report errors. Since ultrasonic range meters emit sound waves and have fan-shaped emission characteristics of sound waves, when there are many obstacles where the sound waves pass through, more sound waves will be reflected back, causing more interference and making it easier to report errors. The laser rangefinder emits a very small laser beam and then comes back, so as long as the beam can pass through, there is almost no interference.
4. The price of an ultrasonic rangefinder ranges from tens to hundreds of yuan, and the price of a laser rangefinder ranges from a few hundred yuan to thousands or tens of thousands of yuan. There is a big difference depending on the accuracy and distance.
