双筒多视场太阳光度计可用来测量卷云光学性质, 为了解决当有不均匀云时传统太阳光度计利用四象限光强分布跟踪太阳会不准的局限性问题, 采用 CCD图像处理技术跟踪太阳, 研制了双筒多视场太阳光度计的图像跟踪系统。介绍了该图像跟踪系统的总体结构及原理和成像光筒的设计, 详细阐述了天文视日轨迹跟踪方法和图像处理技术跟踪方法相结合的双模式跟踪算法及其流程, 给出了跟踪效果图, 并对其可靠性和稳定性进行了分析。结果表明, 该系统能很好的跟踪太阳, 可实现非阴雨天气的全天候全自动跟踪, 跟踪精度高于 1′。该系统适于双筒多视场太阳光度计用于测量卷云光学性质, 也可应用于其它对太阳跟踪精度要求较高的场合。

Binocular Multi-FOV Sun-photometer (BMFOVSP) is used to measure the optical properties of cirrus. In order to solve the localized problem of traditional sun-photometer tracking sun inaccurate by using four-quadrant detector when the cloud is in homogeneous, image tracking system of BMFOVSP is developed by using image processing technology to track sun. The all-weather and full automatic sun tracking in the absence of drizzle is achieved by adopting the double modes tracking technology with the combination of both calendar-check tracking and image processing technology tracking. The tracking accuracy is higher than one minute of angle. The system fits BMFOVSP for measuring the optical properties of cirrus. It also can be applied to other occasions which require high sun tracking accuracy. Gross structure, system principle and the design of imaging unit are introduced. The methods of both calendar- check tracking and image tracking are represented in detail. The reliability and stability of system are analyzed. The graphs of tracking effect are shown, which means the proposed tracking system can track sun primely and have high tracking accuracy.