Widely Used In The Field Of Autonomous Driving Green Laser Pointer
In terms of radar, there are currently three types of green laser pointer that have been widely used in the field of autonomous driving. Lidar, ultrasonic radar and millimeter wave radar. Lidar, also known as Lidar, is a collection of lasers and radars. There are usually 16 wires, 32 wires, and 64 wires. The more wire harnesses, the stronger the performance. Lidar, working in the infrared and visible light bands, has high detection accuracy and a wide detection range. It can distinguish obstacles in a short period of time. In addition, it can also operate normally in environments with poor light conditions. However, it is easily disturbed by "debris" in the environment. Therefore, the performance is poor in extremely short weather such as rain and snow. The green laser pointer cannot provide 24/7 service.
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This kind of green laser pointer radar is extremely expensive, so usually only one is equipped in a car. And located at the top. Ultrasonic radar detects by transmitting close-range ultrasonic waves and collecting and analyzing reflection data. This type of radar consumes energy slowly and has strong penetrability. It has a great advantage in short-range measurements. In addition, because of its simple ranging method, the cost of this type of radar is very low. In addition to autonomous driving, ultrasonic radar has been widely used in the automotive field. Such as warning of obstacles within 3 meters. The green laser pointer helps drivers stop and wait.
The bigger the laser beam divergence angle, the close its targeted range. Low beam divergence laser pointer has superior advantages than big divergence laser devices. Under condition of the same light emitting area, longer wavelength laser pointer has bigger laser beam divergence. As a result, red laser has longer beam visibility than infrared laser.
However, different kinds of laser pointers generate different mechanism. It is difficult to achieve the same light emitting area with the output power pointing. For instance, the light emitting area of 808nm infrared laser is larger than 980nm IR lasers. 808nm infrared laser has larger laser beam divergence than 980nm infrared laser pointer under circumstance of same output power.
2020-02-06 03:06:17
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