Clarifying three major doubts about laser rangefinders
Doubt No. 1: How laser rangefinders work
Laser rangefinders generally use two ways to measure distance: pulse method and phase method.
The process of pulse method distance measurement is that the laser light emitted by the rangefinder is reflected by the measured object and then received by the rangefinder, which records the round-trip time of the laser light at the same time. Half of the product of the speed of light and the round trip time is the distance between the rangefinder and the object being measured. The accuracy of the pulse method of distance measurement is generally around +/-1 metre. In addition, the measurement blind spot of this type of rangefinder is generally about 15 metres.
Phase-type laser rangefinder is a radio frequency, the laser beam amplitude modulation and determination of modulated light to and from the measurement line once the phase delay, and then according to the wavelength of the modulated light, the conversion of this phase delay represented by the distance. That is, the indirect method of determining the time required by the light by round-trip line measurement.
Doubt two: the main application areas of laser rangefinders
Due to the laser rangefinder easy to use, simple operation and other advantages have been widely used in electric power, construction, geology, fire, railway, agriculture, forestry, real estate, and other fields. Relevant laser rangefinder can refer to Australia's new instrument TM series laser rangefinder, the series Laser rangefinder telescope, accuracy ± 1m, fast and simple aiming, can resist water and dust, data retention of 10 seconds to show that the structure of the simple and lightweight, and no one to use 10 seconds after the automatic shutdown, level 1, invisible and harmless laser light many advantages!
Doubt three: the difference between the so-called "safe" laser rangefinder and "unsafe" points
As the name suggests, the laser rangefinder is a laser as the main working substance to work. At present, the market of handheld laser rangefinders working substances are mainly the following: working wavelength of 905 nm and 1540 nm semiconductor laser, working wavelength of 1064 nm YAG laser. 1064 nm wavelength of human skin and eyes is harmful, especially if the eyes accidentally come into contact with the wavelength of 1064 nm of laser light, the damage to the eyes may be huge sex. of. Therefore, in foreign countries, handheld laser rangefinders, completely outlawed 1064nm laser. At home, some manufacturers still produce 1064nm laser rangefinders.
As for 905nm and 1540nm laser rangefinders, we call them "safe". For 1064nm laser rangefinders, we call them "unsafe" because they are potentially harmful to the human body.
