基于条纹反射术的槽式抛物面单元镜面形测量

针对太阳能热发电槽式抛物面聚光器单元镜面形测量的问题,采用条纹反射技术和时域相移解包裹技术相结合的方法,在三维轮廓测量系统模型的基础上,建立了一个结构简单、易操作的测量系统。在对系统设备无任何严格要求的前提下,利用投影仪向投影屏幕上投射正弦条纹,由相机拍摄记录单元镜反射产生的条纹,根据标定的系统参数及三维轮廓测量系统模型来计算单元镜表面面形。通过现场实验,获取了单元镜的面形分布情况,结论证明该测量方法的可行性。该测量系统的建立为以后的测量工作提供了一定的参考,并在太阳能热发电领域有很好的应用前景。

Surface Measurement of Parabolic Trough Unit Mirror Based on Fringe Reflection

A measurement system is established for the parabolic trough unit mirror in concentrating solar power (CSP). The system applies the fringe reflection technique and the temporal phase unwrapping technique. Based on three-dimensional profilometry system model, the measurement system has less equipments and simpler operation. Without any strict requirements to the system equipment, a sinusoidal fringe is projected with projector, and the images are recorded by a camera after reflected by the unit mirror. Then the surface is computed by the parameters of the system. Experimental results verify that the measurement method is reliable. The system is helpful to the measurement work, and has a very good application prospect in the solar thermal power field.