Optical performance and results from the alignment and testing of the cameras for the MOONS spectrograph.
Optical performance and results from the alignment and testing of the cameras for the MOONS spectrograph.
复制标题
MOONS 摄谱仪相机的光学性能以及校准和测试结果。
DOI：
10.1117/12.2629279
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Fisher M
中科院分区：
文献类型：
--
作者：
Fisher M
MOONS（多目标光学和近红外光谱仪）是VLT的双光纤光谱仪。每台摄谱仪都装有512根光纤，光纤发出的光被分散到三个臂中，覆盖RI、YJ和H波段。为每个带提供单独的相机，需要生产六个相机并单独对准。所有六个摄像头都经过了组装、校准和低温测试。RI和YJ相机已经成功地集成到MOONS仪器低温恒温器中，另外两台相机，包括至少一台H波段相机，预计将在下次冷却时安装。在概述了相机的光学设计之后，本文介绍了机械设计以及杂散光分析和挡板的加入。Bertin Winlight提供了六套光学器件，并概述了它们的计量数据。在将第一组光学器件组装和预对准到相机外壳中之后，进行了一系列静态和动态测试，以确保光学器件在搬运、运输和ESO规定的地震条件下保持对准。预对准阶段和随后的机械测试与位移和脉冲测试的结果一起描述。由于相机光学系统的陡峭非球面表面，因此每一组必须在低温下倾斜和去空间对准。介绍了专门设计用于MOONS相机低温对准和稳定性测试的设备，并描述了在温暖和低温条件下的精对准过程。最后的对准阶段的结果和低温冷却下的对准的稳定性进行了介绍和讨论。
The MOONS (Multi-Object Optical and Near-infrared Spectrograph) is a twin, fibre-fed spectrograph for the VLT. Each spectrograph is fed with 512 fibres, the light from which is dispersed into three arms covering the RI, YJ and H bands. A separate camera is provided for each band, requiring six cameras to be produced and individually aligned. All six cameras have been assembled, aligned and cryogenically tested. The RI and YJ cameras, have been successfully integrated into the MOONS instrument cryostat and two more, including at least one of the H-band cameras are expected to be fitted for the next cool-down. Following an overview of the optical design of the camera, this paper presents the mechanical design together with stray light analysis and the inclusion of baffling. Six sets of optics have been provided by Bertin Winlight and an overview of their metrology data is presented. After assembly and pre-alignment of the first set of optics into the camera housing, a series of static and dynamic tests were carried out to ensure that the optics would remain in alignment following handling, transportation and ESO specified earthquake conditions. The pre-alignment stage and subsequent mechanical tests are described together with results from displacement and impulse testing. Because of the steep aspheric surfaces of the camera optics each set must be aligned in tilt and de-space at cryogenic temperatures. The facility specifically designed to accommodate the cryogenic alignment and stability testing of the MOONS cameras is presented and the fine alignment process under both warm and cryogenic conditions is described. Results from the final alignment stage and the stability of alignment under cryogenic cooling are presented and discussed.