宽视场航天相机像面测量技术

Measurement technology of image plane of wide-field space camera

宽视场高质量的航天相机是未来有效载荷的发展方向,基于宽视场航天相机的装调需求,提出了一种干涉测量与几何量测量相结合的像面测量方法。搭建了宽视场航天相机像面测量平台,利用激光干涉仪确定各视场的焦点位置,激光跟踪仪获取各焦点位置坐标,通过坐标换算和拟合完成像面的绘制,像面测量误差可控制在0.01 mm内。通过该方法,完成了一款离轴三反航天相机的像面绘制,系统焦距1200 mm,相对孔径1∶2.4,视场角10°×1°。测试的像面与光学设计软件ZEMAX输出的理想像面进行比对,像面形状及位置基本吻合,平面度偏差0.009 mm。测试结果表明光学系统装调到位,为探测器配准工序的完成提供了重要依据。

Wide-field and high-quality space camera is the future development direction of payload.Based on the alignment requirements of the wide-field space camera,an image plane measurement method combining interferometry and geometric measurement was proposed.The image plane measurement platform of the widefield space camera was built.A laser interferometer was used to determine the focal position of each field of view and a laser tracker was used to obtain the coordinates of each focal position in this method.Finally,the image plane was drawn through coordinate conversion and fitting.Image plane measurement error could be controlled within 0.01 mm.Through this method,the image plane drawing of off-axis three-mirror reflective space camera was completed,the system was with a focal length of 1200 mm,a F-number of 2.4,a linear field of view of 10°×1°.The test image plane was compared with the ideal image plane output by the optical design software ZEMAX,the shape and position of the image plane were basically consistent,and the flatness deviation was at 0.009 mm.The test results show that the optical system is aligned in place,and it provides an important basis for the completion of the detector registration process.