基于地基天文观测系统光轴平行性的校验需求, 建立了一套高精度多光轴平行性检测系统。针对具有成像光谱仪的天文观测系统, 将恒星作为点光源, 利用天文跟踪系统完成对恒星星象及相应光谱数据的同步采集。在光谱维视场中,成像光谱仪不易准确地确定恒星的位置, 该检测方案利用赤道仪控制系统和成像光谱仪狭缝视场的特点, 对恒星目标进行一维扫描, 将成像光谱仪接收到的恒星能量随着扫描位置进行拟合来确定光谱维视场中心, 通过高斯拟合法来计算光学仪器之间光轴的平行性偏差。试验结果表明: 测量结果不确定度为1.52", 该检测系统结构简单, 满足成像光谱仪和其它成像仪器野外高精度快速检测光轴一致性的要求。

To satisfy the requirement of field measurement of optical axis parallelism for the ground-based astronomical observation system, a high-precision multi-optical axis parallel calibration system was put forward. For astronomical observation system which contains the imaging spectrometer, a star was used as a point source, and the star image and its spectrum was synchronous acquisition by using the astronomy tracking system. It was not easy to determine the center of field of view in spectral dimension of the imaging spectrometer, and the scheme takes advantage of control system of the equatorial and a small field of view of the imaging spectrometer, so the center of field of view in spectral dimension was calculated by fitting energy of scanning the target star with respect to the scanning position, then the bias of optical axis parallelism between the instrument was calculated by Gaussian fitting. Experimental results show that the standard uncertainty of this measurement can reach 1.52″, and the optical measurement system structure is simple, so it meets the need of field optical axis parallel measurement with high precision and high speed between the imaging spectrometer and other imaging instrument.