Engineering applications, especially the needs of aerospace applications, laser ranging technology is constantly evolving progress. Laser ranging device is currently working toward the small (small size, quality, low power consumption), precision (high precision), far, (odometry far), fast (short measurement time and high repetition rate) direction. The laser ranging technology easily and detection technology integration, resulting in more powerful, multi-use detection system. In recent years, China attaches great importance to research on laser ranging techniques, many domestic universities and research institutes are conducting this research and engineering applications. Space laser ranging is a very complex technology, there are still many key technologies need to be addressed. And at the same time, different green laser pointer of multiple and different functions can be adopted by different clients.
Areas of applied research for space exploration is not much less real practical application in the field of aerospace. Chang'e probe in satellite laser altimeter used in China is currently the only set to go into space laser ranging equipment. As space exploration is an important field of technology, applied research work in the field of space is very necessary and urgent need to accelerate the development of laser ranging techniques. In addition, key device and technology of the laser ranging of the avalanche photodiode, high frequency laser current modulation technique with the international advanced level gap, the domestic laser ranging equipment ranging accuracy, reliability and the advanced international level there a gap. More attention should be paid to the improvement of the quality and performance of green laser pointer .
Therefore. Research and application of the laser ranging method, but also some key components, critical technology to carry out a major key, which is very necessary for the promotion of technological progress of domestic laser ranging and reliable in the field of space applications. Can say for sure. In the near future, laser ranging technology will play an increasingly important role in the military and the national economy. First laser diode aiming a laser pulse. Scattering in all directions by the target reflected laser. Some scattered light returns to the sensor receiver, the optical system to receive imaged onto an avalanche photodiode. The avalanche photodiode is an internal amplification of the optical sensor so that it can detect extremely weak light signals. Record and process issued from the light pulse to return to the time to receive the experience, you can Determination of target distance. The exact and strict customized requirements of the customer towards green laser pointer should be met.
Laser sensors must be extremely accurate determination of transmission time, because the speed of light is too fast. For example, the speed of light is about 3X10 ^ 8m / s, in order to make the resolution to reach 1mm, ranging sensor electronic circuit must be able to distinguish the following very short time: to distinguish the 3ps time of electronic technology excessive demands, to implement the cost is too high. But now the laser sensor cleverly avoided this obstacle, the use of a simple statistical principles, namely the law of averages to achieve a resolution of 1mm, and can guarantee the response speed. Long-range laser rangefinder to the target injection at work a bunch of very fine laser target reflected laser beam received by the optical components, timer determination of the time of the laser beam from the transmitter to the receiver. The total output power of green laser pointer can be manufactured to 500mW, 1000mW or 2000mW.
Calculate the distance from the observer to the target; LED white speedometer imaging instrument on the internal IC chip CCD, the CCD chip and stable performance, long life, and independent of the working environment and temperature. Therefore, the measurement accuracy of LED white speedometer guarantee stable and reliable performance. The laser is widely used in the detection field, the technical content is very rich, very obvious impact on the social production and life. The laser rangefinder is a laser one of the earliest applications. This is because the laser has a strong directional, high brightness, good monochrome many advantages. 1965 years ago, the Soviet Union used the distance between the laser measured the Earth and Moon (384401km) error is only 250m. Americans landing on the moon in 1969 Home reflector on the lunar surface with a laser to measure the Earth-Moon distance, the error is only 15cm. This kind of laser pointer is not that stable.
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