A laser range finder is an instrument that uses a laser to accurately measure the distance of a target. The laser range finder emits a very fine laser beam to the target during operation. The photoelectric component receives the laser beam reflected by the target, and the timer measures the time from the transmission to the reception of the laser beam to calculate the distance from the observer to the target. The laser range finder is light in weight, small in size, simple in operation, fast and accurate, and its error is only one-fifth to one-hundredth of the other optical range finder.
principle
1. Using the principle of infrared ranging or laser ranging
The principle of 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 = 299792458 m / s and the atmospheric refractive index n. Since the direct measurement time is difficult, it is usually measured the phase of the continuous wave, which is called a phase measuring range finder. Of course, there are also pulsed range finder, typically DI-3000 from 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, precision ranging requires a total reflection prism to match, and the range finder for house measurement is directly measured by smooth wall reflection, mainly because the distance is relatively close, and the signal intensity reflected by the light 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. The plane of the object can be measured as diffuse reflection
Usually it is also possible. 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. Laser range finder accuracy can reach 1 mm error, suitable for various high precision measurement purposes
classification
The laser range finder is divided into a handheld laser range finder and a telescope type laser range finder.
1. Handheld laser range finder: The measuring distance is generally within 200 meters, and the precision is about 2mm. This is the most widely used laser range finder. In addition to functionally measuring the distance, it is generally possible to calculate the volume of the measured object.
2. Cloud service laser range finder: Real-time transmission of measurement data on the laser range finder to mobile terminals such as mobile phones and tablets via Bluetooth Meterbox; data can be transmitted to the cloud server via wifi networking, and shared in real time by remote construction partners Measurement data such as iLDM-150.
3. Telescope-type laser range finder: The measurement distance is relatively long, generally about 600-3000 meters, but the accuracy is relatively low, and the accuracy is generally about 1 meter. The main application range is field long distance measurement.
use
Laser range finder is widely used in topographic surveys, battlefield surveys, tanks, aircraft, ships and artillery to measure targets, and to measure the height of clouds, aircraft, missiles, and satellites. It is an important technical equipment to improve the accuracy of high tanks, aircraft, ships and artillery. Due to the continuous downward adjustment of the price of laser range finder, the industry has gradually begun to use laser range finder, which can be widely used in industrial measurement and control, mining, port and other fields.
Purchase
Some points to consider when purchasing a rangefinder:
1. Measurement range
2. Measurement accuracy
3. Use occasions
Basically divided into the following situations:
a) It is only necessary to measure the distance within a few meters or ten meters.
And the accuracy is not high.
Laser range finder
Laser range finder
Recommendation - Optional "Ultrasonic Rangefinder".
Remarks--The effect of ultrasonic range finder measurement is greatly affected by the environment. The stability and directionality are worse than laser range finder, but the price is relatively cheap, suitable for indoor measurement.
b) The measuring distance is not long, and it is mostly used indoors, and the precision is high.
Suggestion - Optional "Handheld Laser Rangefinder".
Remarks--The handheld laser range finder is most suitable for indoor use, and the measurement accuracy and effect are very good.
(If the user needs to detect in an outdoor environment, it is recommended to use a professional laser sight and reflector to achieve the desired range and effect.)
c) The measurement distance is far and it is mostly used for outdoor use.
Suggestion - purchase "telescope laser range finder" (ie: laser ranging telescope)
application
Handheld laser range finder has always been a concern and painstaking work for the housing management department. The housing survey area map is directly used as the title of the property right certificate and has legal effect. It is not only directly facing the common people, but also directly related to the economic interests of the people. Therefore, the control of the measurement error of the house is particularly important. According to the past practice, the measurement of the construction area and the use area by the tape measure or the steel tape measure can satisfy the basics. Requirements, however, in the long-distance measurement, the measurement layer is high, the measurement of the hard-to-reach ground has large errors, and there are shortcomings such as labor intensity and complicated work. In today's high-tech rapid development, such original and traditional measurement methods have been Obviously not in line with the fast and efficient requirements of today's information society. For this reason, after the introduction of the handheld laser range finder, after several months
Laser range finder
Laser range finder
In actual use, the instrument is generally considered to be particularly suitable for the measurement of buildings with complex structures, medium and high-rise, long-distance houses. Easy to use, accurate measurement data (three millimeter accuracy), improved work efficiency (non-contact measurement), completely discarding a tape measure (or steel tape measure) to measure the house, reducing the error of the survey and ensuring the accuracy of the area measurement. The measurement results make the owners more convinced. Of course, the instrument also has aspects that need to be improved. For example, in the strong sunlight, long-distance target objects are more difficult to see, and accessories such as telescopes are needed. In addition, it is more difficult to calibrate the level bubble for each measurement, and it is best to automatically calibrate. In short, the handheld laser range finder is still popular with us.
Routine maintenance
The problem that needs attention when using the laser range finder: The laser range finder can not directly measure the human eye to prevent damage to the human body. At the same time, the vibrometer generally does not have a waterproof rangefinder, so it is necessary to pay attention to waterproof. The latest American Rioport laser range finder is mainly suitable for outdoor hunting enthusiasts in the United States, so the advantage of making it is that it can be waterproof and anti-fog, with jungle trees and leaves.
The laser does not have a drop-proof function, so the laser rangefinder can easily break the illuminator.
Laser rangefinder maintenance:
1 Always check the appearance of the instrument to remove dust, grease, mildew, etc. from the surface.
2 Use a soft, dry cloth when cleaning the eyepiece, objective or laser emission window. It is strictly forbidden to use hard objects to avoid damage to optical performance.
3 This machine is a high-precision instrument integrating light, machine and electricity. It should be handled with care and should not be squeezed or dropped from a high place to avoid damage to the instrument.
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