Application, Classification, and Principle of Laser Rangefinder
laser range finder
The laser rangefinder is an instrument that uses laser to accurately measure the distance of the target. When the laser rangefinder is working, it emits a very thin laser beam to the target, and the photoelectric element receives the laser beam reflected by the target. The timer measures the time from the emission to the reception of the laser beam, and calculates the distance from the observer to the target.
principle
1. The principle of using infrared ranging or laser ranging
2. The plane of the measured object must be perpendicular to the light
3. The object plane can be measured as diffuse reflection
4. The accuracy of ultrasonic ranging is relatively low, and it is rarely used now.
5. The accuracy of the laser rangefinder can reach 1 mm error, which is suitable for various high-precision measurement purposes.
Classification
Laser rangefinders are divided into handheld laser rangefinders and telescopic laser rangefinders.
1. Handheld laser rangefinder: the measurement distance is generally within 200 meters, and the accuracy is about 2mm. This is currently the most widely used laser range finder. Functionally, in addition to measuring the distance, it can also generally calculate the volume of the measured object.
2. Cloud service laser rangefinder: transmit the measurement data on the laser rangefinder to mobile terminals such as mobile phones and tablet computers in real time through Bluetooth Meterbox; through wifi networking, the data can be transmitted to the cloud server and shared with remote construction partners in real time Measurement data, such as iLDM-150.
3. Telescope-type laser range finder: the measurement distance is generally about 600-3000 meters. This type of range finder has a relatively long measurement distance, but the accuracy is relatively low, and the accuracy is generally about 1 meter. The main application range is long-distance measurement in the field.
use
Laser rangefinders are widely used in terrain survey, battlefield survey, tanks, aircraft, ships and artillery
Range measurement of targets, measurement of altitudes of clouds, aircraft, missiles and artificial satellites, etc. It is an important technical equipment to improve the accuracy of high tanks, aircraft, ships and artillery. Due to the continuous reduction in the price of laser range finders, laser range finders have gradually begun to be used in industry, which can be widely used in industrial measurement and control, mines, ports and other fields
application
Application of handheld laser range finder in house survey House survey has always been a concern and bother for the housing management department. It is not only directly facing the people, but also directly related to the economic interests of the people, so the control of the measurement error of the house is particularly important. According to the past habits, use a tape measure or a steel tape to measure the building area and the usable area, although it can also meet the basic requirements. However, there are large errors in the measurement of long-distance, high-level, and difficult-to-reach places, and there are shortcomings such as labor-intensive and complicated work. Today, with the rapid development of high-tech, such primitive and traditional measurement methods have become It obviously does not meet the fast and efficient requirements of today's information society. To this end, following the introduction of the handheld laser rangefinder, several months of
In actual use, it is generally believed that this instrument is especially suitable for the measurement of buildings with complex building structures, middle and high-rise buildings, and long distances. Easy to use, accurate measurement data (three millimeters accuracy), improved work efficiency (non-contact measurement), completely abandoned the method of measuring houses with a tape (or steel tape), reduced surveying errors, and ensured the accuracy of area measurement. The measurement results make the owners more convinced. Of course, the instrument also has aspects that need to be improved urgently. For example, under strong sunlight, long-distance target objects are difficult to see clearly, and accessories such as telescopes are needed. In addition, it is laborious to calibrate the level bubble for each measurement, and it is better to automatically calibrate. In short, handheld laser rangefinders are still popular with us.
Optical instruments, instruments and meters: range finder/altimeter, area meter, handheld GPS, speedometer, measurement mark (subsidence (deformation) observation point mark, GPS point mark, cross control point mark, boundary point, elevation Point markers, mandatory centering bases, benchmarking point markers), telescopes, night vision devices, image stabilization devices, sensors, alcohol detectors, colorimeters, geological compass
