What is the working principle of laser rangefinder? Laser rangefinder generally uses two methods to measure distance: pulse method and phase method. The process of pulse method ranging is as follows: the laser emitted by the rangefinder is measured After the reflection of the object, it is received by the rangefinder. The rangefinder simultaneously records the round-trip time of the laser. Half of the product of the speed of light and the round-trip time is the distance between the rangefinder and the object to be measured. The accuracy of the distance measurement by the pulse method is Generally, it is about +/- 1 meter. In addition, the measurement blind area of this type of distance meter is generally about 15 meters. What are the main application fields of laser distance meters? Laser distance meters have been widely used in the following fields: Electricity. Water conservancy. Communication. Environment. Construction. Geology. Police. Fire. Navigation. Railway. Anti-terrorism/military. Agriculture. Forestry. Real estate. The difference between "unsafe"? As the name suggests. Laser rangefinders use lasers as the main working substance to work. At present, the working substances of hand-held laser rangefinders on the market mainly include the following: the working wavelength is 905 nm and 1540 nm semiconductor laser. The working wavelength is 1064 nm YAG laser. The 1064 nm wavelength is harmful to human skin and eyes. Especially if the eyes are accidentally exposed to the 1064 nm wavelength laser. The damage to the eyes may be Permanent. So. In foreign countries. In handheld laser rangefinders, 1064nm lasers are completely banned. In China, some manufacturers also produce 1064nm laser rangefinders. For 905nm and 1540nm laser rangefinders Distance meter. We call it "safe". For the 1064 nm laser distance meter. Because it is potentially harmful to the human body. So we call it "unsafe". Phase laser distance meter The phase laser rangefinder uses the frequency of the radio band to modulate the amplitude of the laser beam and measure the phase delay generated by the modulated light going back and forth to the measuring line once. Then, according to the wavelength of the modulated light, convert the distance represented by this phase delay. That is Use the indirect method to measure the time required for the light to pass through the round-trip line. As shown in the figure. The phase laser rangefinder is generally used in precision ranging. Because of its high accuracy, it is generally millimeter-level. In order to effectively reflect the signal, and The target to be measured is limited to a specific point commensurate with the accuracy of the instrument. This rangefinder is equipped with a mirror called a cooperative target.