Research Of Laser Spot Detecting Technology Based On Bi-Linear CCD

Space Optical Communication will become the new direction of communication with the development of the high stable laser, laser controller, high sensitive receiver and electronic devices which are used for optical communication. There are many characteristics, such as, strong anti-interference, safety factor, high reliability. Capture, alignment, tracking is a free-space optical communications, an important part of the essence of which is the whole system to track some of the most important. Therefore, the rapid and precise coordinates of a specific spot will control the visual axis by tilt mirror to achieve an accurate alignment.This paper designs laser spot detecting system based on bi-linear CCD to meet the requirement of precision tracking and accurate alignment of APT. First, the beam through the prism optical system, is imaged in the vertical and horizontal axis, and then received in bi-linear CCD. The converted signal is sent to the host computer by USB interface and processed by the software to get the orientation of the spot. The spot centronic coordinates were acquired by software in the end. The sample rate of the two linear CCDs could reach to3000 frames per second and the detecting accuracy could reach to 0.8μrad as the Fine Tracking System required.