双轴跟踪槽式聚光器的焦面能流测试与聚光特性

Focal-Plane Energy Flux Test and Focusing Characteristic of Dual-Axis Tracking Trough Concentrator

基于双轴跟踪槽式聚光系统设计了焦面能流密度测试装置,采用理论分析和实验测试的方法对由接收器的定位误差和跟踪误差引起的聚焦损失进行研究,并通过采集因子量化光学损失,从而揭示出各种误差影响的规律。结果表明:随着定位误差的增大,焦面宽度增加,焦面能流密度降低且趋于均匀;随着跟踪误差角的增大,焦面中心偏移量和光学损失增加。对于实验使用的双轴跟踪槽式聚光系统,当接收器光孔宽度为50 mm时,若要保证采集因子大于90%,接收器的定位误差需保证在455 mm的±1.1%之间且跟踪误差角小于0.111°,此时采集因子可达95%。采集因子对跟踪误差角的变化更为敏感,实验研究结果与理论分析结果吻合,验证了测试设备和方法的可靠性,实验拟合的函数关系可为工程应用提供了理论指导。

A test device for focal-plane energy flux density was designed based on a dual-axis tracking trough concentrator system. The focusing loss caused by the positioning error and tracking error of the receiver was studied through theoretical analysis and experimental testing. Furthermore, the optical loss was quantified by the acquisition factor, and laws of the influence of various errors were revealed. The results show that with the increase in the positioning error, the focal-plane width increases, whereas the focal-plane energy flux density decreases and tends to be uniform. Moreover, the focal-plane center migration and optical loss increase with the increase in the tracking error angle. For the dual-axis tracking trough concentrator system used in this experiment, when the receiver aperture is 50 mm, if the acquisition factor is greater than 90%, the positioning error of receiver is required to be between ±1.1% of 455 mm and tracking error angle is required to be less than 0.111°, and the acquisition factor can reach 95%. The acquisition factor is more sensitive to the variation of the tracking error angle. The experimental results are consistent with the theoretical analysis results, verifying the reliability of the test equipment and methods. The function relation of experiment fitting can effectively guide the engineering application.