(Ranging Telescope) is a combination of ordinary monocular and laser rangefinde.It can measure distance, speed, angle and height while inspection.
Application of laser rangefinder
Laser rangefinder is an instrument that USES laser to accurately measure the distance
Laser rangefinder in the operation of the policy shot a very fine laser beam, by the photoelectric element to receive the policy reflected laser beam, the timer measured the time from the laser beam to receive, calculate the distance from the observer to the policy if the laser is continuously launched, the measuring distance can reach about 40 kilometers, and can work day and night. If the laser pulse is launched, the general must precision is low, but for distance measurement, can reach the good relative accuracy laser rangefinder light weight, small volume, short operation is fast and accurate, its error is only one 5 of other optical rangefinder to several per cent, have been widely used in topographic survey, field measurement, tanks, planes, ships and artillery range of policy, measure the clouds, the height of the aircraft, missiles and satellites, etc. It is an important technical device for the precision of high moving tanks, aircraft, ships and artillery. As the price of laser rangefinders continues to drop, the industry is gradually using laser rangefinders.
At home and abroad, a number of new micro rangefinder with the advantages of fast ranging, small volume and reliable function, which can be widely used in industrial measurement and control, mines, ports and other fields. What is the principle of infrared ranging or laser ranging? The principle of ranging can be reduced to measuring the time required by the light reciprocation policy, and then calculate the distance D through the light speed c=299792458m/s and atmospheric refraction coefficient n. Because it is difficult to measure time directly, the phase of continuous wave is usually measured, which is called phase measuring rangefinder.Of course, there is also a pulse rangefinder, the typical WILD di-3000 needs to pay attention to, measuring the phase is not to measure the infrared maybe laser phase, but measure the modulation in the infrared maybe laser above the signal phase. Construction work is a kind of hand-held laser range finder, is used for house, the operational principle of the same plane object to be tested is necessary and total reflection prism light vertical yao general precision ranging demand collaboration, and house measurement range finder, directly reflect on the metope of smooth measurement, first because the distance closer, reflected light signal strength is enough big.And this can know, is bound to the vertical, otherwise the return signal is too small will not be able to get the accurate distance if plane object to be tested as diffuse can also can generally, in the practical engineering can choose thin plastic sheet as a reflective surface to deal with diffuse severe problem. Ultrasonic ranging accuracy is lower, now rarely used.
This is the use of laser monochromaticity and coherence, strong directionality and other characteristics, in order to end high-precision measurement and detection, such as measuring length, distance, speed, Angle and so on.Laser ranging can be divided into pulse laser ranging and continuous wave phase laser ranging.Pulsed laser ranging principle similar to radar ranging, rangefinder emission laser signal to the policy, policy will be reflected back, because the speed of light is known, so just recorded optical signal under reciprocating time, with the speed of light (300000 km/s) multiplied by the reciprocating one half of time, is to measure the distance.Hand-held and portable rangefinders, now widely used, range from hundreds of metres to tens of kilometres and measure with a precision of about five metres.
What is the development trend of handheld laser rangefinder?
This is an era of rapid development of science and technology, and people's life is increasingly dependent on scientific and technological achievements. Take the laser rangefinder. Once people measured intervals with tape measures, dropped calls, measurements, and so on. Now they just press a button on this small laser rangefinder. And the laser rangefinder is more accurate and smaller than traditional measurement methods. It is light in weight and easy to carry.
Because of its wide range of USES, the development of laser rangefinders is unstoppable. There are pulsed laser rangefinders and phase laser rangefinders on the market.Although both are used to measure intervals, they have their own advantages, among which pulsed laser rangefinders have wide measurement scale and poor accuracy, while phase laser rangefinders have small measurement scale but high accuracy up to good millimeters. Among them, the application field of pulsed laser ranging is also increasingly broad, such as terrain measurement, tactical frontier ranging, missile orbit tracking and satellite, the measurement of the distance between the earth and the moon.Pulse laser ranging method is the use of laser pulse duration is very short, relatively concentrated energy, instantaneous power is very large characteristics, in the case of cooperation policy, pulse laser ranging can reach very far range;If only the weak reflection signal obtained by the diffuse reflection of the pulse laser of the measured policy is used, it can also be located.Therefore, pulsed laser ranging method is widely used.
A brief explanation of the working principle of the pulsed laser rangefinder: the laser emitted by the rangefinder is reflected by the measured object and then accepted by the rangefinder. The rangefinder also records the time of the laser's reciprocation. Half the product of the speed of light and the time of reciprocation is the distance between the rangefinder and the measured object.
Pulse laser rangefinder measurement accuracy is poor, the general accuracy can only reach the level of m, so some high precision requirements of the occasion may be the project needs to use phase laser rangefinder.But the measurement of distance intervals because of the scale of measurement, the measurement error of one or two meters is now very high precision.