A laser rangefinder's difference from an ultrasonic rangefinder
The principle of ultrasonic ranging is to use the known propagation speed of ultrasonic waves in the air to measure the time it takes for the sound wave to encounter obstacles and reflect back after emission, and calculate the actual distance from the emission point to the obstacle based on the time difference between emission and reception. The ultrasonic range finder is composed of ultrasonic generating circuit, ultrasonic receiving and amplifying circuit, counting and displaying circuit.
The laser range finder is an instrument that uses laser to accurately measure the distance of the target. When the laser range finder is working, it emits a very thin laser beam to the target, and the photoelectric element receives the laser beam reflected by the target. The timer measures the time from the launch to the reception of the laser beam, and calculates the distance from the observer to the target.
The difference between ultrasonic range finder and laser range finder
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 the ultrasonic rangefinder is usually within 80 meters, while the measurement range of the handheld laser rangefinder can reach up to 200 meters, and the measurement range of the laser rangefinder telescope can reach hundreds of kilometers. Even farther away (the measurement accuracy of laser ranging telescopes is usually 1 meter or tens of centimeters).
3. The ultrasonic range finder is easy to report errors. Since the ultrasonic range finder emits sound waves and has the fan-shaped emission characteristics of sound waves, when there are many obstacles where the sound waves pass, there will be more reflected sound waves, more interference, and error reporting. The laser rangefinder is a very small beam of laser light that is emitted and then returned, so as long as the beam can pass through, there is almost no interference.
4. The price of the ultrasonic rangefinder ranges from tens of yuan to several hundred yuan, and the price of the laser rangefinder ranges from a few hundred yuan to several thousand or tens of thousands of yuan. There are great differences according to the accuracy and distance.
