Laser Distance Measuring InstrumentPhase and Pulse MethodLaser Distance Measuring Technology Principles
4x Zoom Digital Sight, 2.5-inch Color Display, and Tilt Sensor All in One The handheld laser rangefinder D5 is designed for outdoor surveying work with a variety of measurement features, including a 4x zoom digital sight The 4x zoom digital sight lets you aim at distant targets faster and can be used in bright outdoor environments. In environments where the laser dot is indistinguishable to the naked eye, you can easily identify the laser dot on the large 2.4-inch high-definition color display and accurately take measurements at a distance.
Laser rangefinder, is the use of modulation of a parameter of the laser to achieve the distance measurement of the target instrument, it is lightweight, small size, easy to operate fast and accurate, and its error is only one-fifth of the other optical rangefinder to a few hundredths of a percent. The world's ** laser, by the United States Hughes Aircraft Corporation scientists Meiman in 1960, the first successful development of the ruby laser. The U.S. military soon carried out research on laser devices on this basis. 1961, the first laser rangefinder through the U.S. military demonstration test, on the laser rangefinder soon thereafter entered the practical stage. As the laser rangefinder prices continue to fall, the industry has gradually begun to use the laser rangefinder. At home and abroad appeared a number of new with fast distance measurement, small size, reliable performance and other advantages of the miniature rangefinder, can be widely used in industrial measurement and control, mining, ports and other fields.
The principle of laser rangefinder
The principle of phase method laser distance measurement technology:
The mainstream laser rangefinder on the market today is based on the phase method of laser rangefinder. This is because the laser rangefinder based on the phase method can easily overcome the ultrasonic distance measurement of a major flaw: the error is too large, so that the measurement accuracy to the millimeter level. The main disadvantage of laser rangefinders based on this method is the complexity of the circuit, the shorter distance (about one hundred meters, after the efforts of many scientists, there are now also a few hundred meters of the action of the phase method of laser rangefinders).
Phase method laser distance measurement technology, is the use of radio frequency laser, amplitude modulation and sinusoidal modulation of light round-trip rangefinder and the distance between the target produced by the phase difference measurement, according to the modulation of the wavelength and frequency of light, the conversion of the laser time of flight, and then calculate the distance to be measured in turn. The method generally requires the placement of mirrors at the object to be measured, the original path of the laser light is reflected back to the laser rangefinder, which is received and processed by the discriminator of the receiving module. In other words, the method is a passive laser distance measurement technology with cooperative target requirements.
Principle of pulse method laser ranging technology:
Phase method is similar to the method used in ultrasonic speed ranging, the maximum measurement distance is usually a few hundred meters, can more easily reach the millimeter order of magnitude, but according to the method designed rangefinder maximum measurement distance is limited, not scalable. The method is mainly used in foreign countries more widely. The pulse method of laser ranging generally uses infrared laser, including near-infrared laser and mid-infrared laser. This band of laser has visible and non-visible points. And the rangefinder based on this technology has low coherence requirements, fast speed, simple implementation structure, high peak output power, high repetition frequency and wide range, so this project uses the pulse method to design the handheld laser rangefinder.
