Name: Chongqing Aite Optoelectronics Co., Ltd.
Contact person: manager feng/Zhang Lu
E-mail: sale_fxj@aitegd。com (Domestic Market-Manager Feng)
email@example.com (International Market-Fred Hu)
Address: No。79-1 Tiansheng Road, Beibei District, Chongqing, China 400700。
Opening Trend of Laser Ranging
Laser rangefinder is an instrument that uses laser to accurately measure the policy distance. During operation, the laser rangefinder emits a very fine laser beam to the policy, and the photoelectric element receives the laser beam reflected by the policy. The timer measures the time from emission to reception of the laser beam, and calculates the distance from the observer to the policy. If the laser is continuously emitted, the measuring range can reach about 40 kilometers, and the operation can be carried out day and night. If the laser is pulse-fired, the accuracy is generally lower, but when used for long-distance measurement, the laser range finder can reach a good relative accuracy. The laser range finder is light in weight, small in volume, simple in operation, fast and accurate, and its fault is only one fifth to one hundred percent of that of other optical range finders. Therefore, it is widely used for terrain measurement, battlefield measurement, ranging of policies by tanks, planes, ships and artillery, and height measurement of clouds, planes, missiles and artificial satellites. It is an important technical equipment with high precision for tanks, planes, ships and artillery. Because the price of laser rangefinders keeps dropping, laser rangefinders are gradually being initially used in industry.
At home and abroad, a number of new micro range finders have emerged with the advantages of fast ranging, small size and reliable function, which can be widely used in industrial measurement and control, mines, ports and other fields. What is the principle of infrared distance measurement or laser distance measurement? The basic principle of distance measurement can be summed up as the time required to measure the light reciprocating policy, and then the distance D can be calculated through the speed of light c=299792458m/s and the atmospheric refractive index N. Because it is difficult to measure time directly, it is usually to measure the phase of continuous wave, which is called phase measuring range finder. Of course, there are also pulse range finders, typically WILD's DI-3000. Phase measurement does not measure the phase of infrared or laser light, but the phase of the signal modulated on the infrared or laser light. There is a hand-held laser range finder for building work, which is used for house measurement. Its operation principle is the same as that of this. Is it necessary for the plane of the object to be measured to be perpendicular to the light? Generally, precise ranging requires total reflection Prism to cooperate. However, 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 strong enough. From this, we can know that it must be vertical, otherwise the returned signal is too small to obtain the accurate distance. If the plane of the measured object is diffuse reflection, it is generally possible. In practical engineering, thin plastic plate will be selected as the reflective flour to deal with the severe diffuse reflection problem. Ultrasonic ranging accuracy is relatively low and is seldom used now.
This is to use the characteristics of laser such as monochromaticity, good coherence and strong directivity to finish high-precision measurement and detection, such as measuring length, distance, speed, angle, etc. Laser ranging can be divided into pulse laser ranging and continuous wave phase laser ranging. The principle of pulse laser ranging is similar to radar ranging. The rangefinder emits laser signals to the policy and will be reflected back when encountering the policy. Because the propagation speed of light is known, it is only necessary to record the reciprocating time of the light signal, and multiply the speed of light (300,000 km/s) by half of the reciprocating time, which is the distance to be measured. Currently widely used hand-held and portable range finders have an operating distance of several hundred meters to tens of kilometers and a measuring accuracy of about five meters.