The accuracy of the laser rangefinder mainly depends on the accuracy of the instrument's calculation of the time between laser emission and reception. According to the technology and application used, laser rangefinders can be divided into conventional laser rangefinders with an accuracy of about 1 meter (mainly used for outdoor sports, hunting, etc.) and high-precision laser rangefinders for surveying, mapping and land surveying. , Construction, engineering applications, military and other occasions that require high precision.
The phase method rangefinder is a rangefinder that modulates the phase of the laser and obtains the distance by measuring the phase difference of the reflected laser. Due to the need to detect the reflected laser phase, the received signal needs to have a strong intensity. Taking into account the safety of the human eye, telephoto systems like pulsed laser rangefinders cannot be used, and the range is very small. The typical range is 0.5mm to 150 meters. The general phase method laser rangefinder uses a 635 nanometer (visible red) laser as the debugging object. It is also commonly known as infrared rangefinder, but the definition of laser is colorless. If the 635nm laser rangefinder is directly irradiated to the human eye, it will cause irreversible damage. Please use and protect correctly.
Since the propagation speed of ultrasonic waves in the air is greatly affected by temperature, humidity, air pressure, etc., the measurement error is large. The longer the ultrasonic wave length, the shorter the propagation distance. Therefore, the general ultrasonic rangefinder has a shorter measurement distance and a relative measurement accuracy. Lower. However, using the fan-shaped propagation characteristics of ultrasonic waves, its detection range is larger than that of photoelectric rangefinders. It is widely used in safety protection, cable height measurement, obstacle detection and other fields in actual engineering.