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The distance is generally measured in two ways: the pulse method and the phase method. The process of the pulse method is as follows: the laser emitted by the range finder is reflected by the object to be measured and then received by the range finder, and the range finder simultaneously records the time of the laser round trip. 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 for measuring distance is generally around +/- 1 meter. In addition, the measurement dead zone of such a range finder is generally about 15 meters.
1. The principle of using infrared ranging or laser ranging can basically be attributed to measuring the time required for the light to travel to and from the target, and then calculating the distance D by the speed of light c=299792458m/s and the atmospheric refractive index n. Difficulties, usually measuring the phase of a continuous wave, is called a phase measuring range finder. Of course, there are also pulsed range finder, typically DI-3000 of WILD. It should be noted that the phase measurement is not to measure the phase of the infrared or laser, but to measure the phase of the signal modulated on the infrared or laser. The construction industry has a hand-held laser range finder for house measurements that works in the same way. 2. The plane of the object must be perpendicular to the light. Usually, the precision distance measurement requires a total reflection prism. The distance meter used for house measurement is directly measured by smooth wall reflection, mainly because the distance is relatively close and the light is reflected back. The intensity is large enough. It can be known that it must be vertical, otherwise the return signal will be too weak to get the exact distance. 3. It is usually possible to measure the plane of the object as diffuse reflection. In actual engineering, a thin plastic plate is used as a reflective surface to solve the problem of serious diffuse reflection. 4. Ultrasonic ranging accuracy is relatively low, and the use is relatively small. 5. The laser range finder can achieve an accuracy of 1 mm, which is suitable for various high-precision measurement purposes.
What are the main areas of application of laser range finder?
Laser range finder has been widely used in the following fields: electric power, water conservancy, communication, environment, construction, geology, police, fire, blasting, navigation, railway, military, agriculture, forestry, real estate, leisure / outdoor sports.