This is an era of rapid technological development, and people’s lives are increasingly dependent on scientific and technological achievements. Take the handheld laser distance measurer as an example. In the past, people used tape measures, line breaks to measure intervals. Now, they can be done by pressing buttons on this small laser distance measurer. In addition,handheld laser distance measurer is more accurate and smaller than traditional measurement methods. It is light and easy to carry.
Due to its wide range of uses, the development of laser distance measurer is unstoppable. The laser rangefinders on the market now include pulse laser distance measurers and phase laser distance measurers. Although they are used to measure intervals, they all have their own advantages. The pulse laser distance measurer has a wide measurement range and poor accuracy, while the phase laser distance measurer has a small measurement range but high accuracy, which can reach the millimeter level. Among them, the application fields of pulse laser ranging are becoming more and more extensive, such as topographic surveying, tactical frontier ranging, missile track tracking, satellites, earth-moon ranging, etc. The laser pulse has a long duration, relatively concentrated energy, and high instantaneous power. In the case of cooperative policies, pulse laser distance measurers can reach a very long distance; if only the diffuse reflection square of the pulse laser of the measured distance is used, the weak small reflection signal can also be used for distance measurement. Therefore, the pulse laser distance measuring method is widely used.
Now let’s briefly introduce the working principle of the pulse laser distance measurer: the laser emitted by the rangefinder is reflected by the measured object and then received by the rangefinder. The rangefinder also records the round-trip time of the laser, the product of the speed of light and the round-trip time. Half of it is the distance between the rangefinder and the measured object.
The measurement accuracy of the pulse laser distance measurer is poor, and the general accuracy can only reach the meter level, so some occasions with higher accuracy requirements may need to use a phase laser distance measurer. However, due to the wide measurement range, long-distance measurement is very accurate. The measurement error of one or two meters is already very high.
