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Use laser rangefinder correctly
Laser is a very high intensity light source radiation equipment, high power laser can be used for cutting and welding metal materials, so the laser on the human body, especially the human eye has serious harm, the use of special attention.
Laser in the world has the common classification and the common security warning mark, laser into four categories (Class1 ~ Class4), a laser is safe for people, two laser light harm to people, three or more laser serious harm to people, the use of special attention, avoid direct exposure to human eyes.
At the beginning of the 1990s, several large companies in Europe and America successively produced semiconductor laser diodes for commercial use, which revolutionized the practical application value of laser. Other kinds of laser because of laser generation mechanism is too messy, make its volume, weight is particularly large, high power consumption reasons, greatly restricted the use of laser. The appearance of semiconductor laser makes it easy to deal with these problems.With the semiconductor laser technology to further old, the price is gradually falling, its application batch and application field is expanding, on the present opening speed, the application prospects are very good. Semiconductor laser small volume, light weight, high reliability, high conversion power, low power consumption, drive power is brief, can be directly modulated, simple structure, low price, safe use, its application field is very wide. Such as optical storage, laser printing, laser typesetting, laser ranging, barcode scanning, industrial exploration and surveying instrument, laser flash, medical equipment, military, security, field exploration, construction quashed and marking instruments, laboratory and education demonstration, stage lights and laser play location, laser level and all kinds of lines, etc. Some common interests of semiconductor laser make it very suitable for military applications, such as field ranging, aiming of guns, shooting imitation system, blinding, guidance for submarine communication, fuze, security and so on.Because it can be powered by ordinary batteries, it is possible to equip some portable weapons equipment.
How to ensure the precision of laser rangefinder?
Today, laser range finders of a wide range of functions, but from the operation mode (or operation principle) can be seen only two, namely: pulse laser ranging and continuous wave laser ranging.The principles and characteristics of the two rangefinders are described below:
The principle of pulsed laser ranging is that a series of very narrow light pulses (pulse width is less than 50ns) are transmitted to the policy by pulsed laser, the light reaches the policy surface and is partially reflected, and the interval between the rangefinder and the policy can be calculated by measuring the moment when the light pulse is transmitted to the receiver. Assuming the measured interval is h, the reciprocating moment of light pulse is t, and the propagation velocity of light in the air is c, then: h=ct/2
Pulsed laser rangefinders emit very strong lasers.The range finding ability is strong, even for non-cooperative policy, the maximum range can reach more than 30000m.Its ranging accuracy is generally 5 meters, the highest up to 0.15m.Pulsed laser rangefinders can be used for ranging from military to non-cooperative ranges, to climate measurements of visibility and cloud heights, and to fine interval measurements of satellites.
Successive wave laser rangefinder usually adopt ranging based on the phase method and its principle is to approach first launched a beam of laser beam through modulation of successive waves, after arriving at the policy on the surface of the beam is reflected, after the launch of the modulation measurement of the phase difference between the laser beam with the receiver to receive the echo can be concluded that policy and the gap between the rangefinder.