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Alignment and testing of the NIRSpec Filter- and Grating Wheel Assembly

机译：NIRSpec滤光片和光栅轮组件的对准和测试

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摘要

In order to perform spectrometric measurements, the Near Infrared Spectrometer (NIRSpec) aboard the James Webb Space Telescope (JWST) needs the ability to select various spectral band widths and split these up into its comprised wavelengths. These functions are achieved by the Filter Wheel Assembly (FWA) and the Grating Wheel Assembly (GWA). The filters of the FWA select a different bandwidth of the spectrum each while the gratings on the GWA yield specific diffractive characteristic for spectral segmentation. A high spectral sensitivity as well as the ability to detect the spectra of various objects at the same time result in high requirements regarding the positioning accuracy of the optics of both mechanisms in order to link the detected spectra to the 2-dimensional images of the observed objects. The NIRSpec mechanism including FWA and GWA will operate at temperature levels below 42K which are established during testing inside of a cryostat. However the alignment and testing of these mechanisms requires a lot of thought since there is very limited access to the item under test within such a device. Alignment needs to be preloaded based on simulations and testing is reduced to optical methods and evaluation of electrical signals.This paper describes the methods used for the various alignment steps, the corresponding tests and their precision of measurement as well as the achieved accuracies in the mechanism performance.
机译：为了执行光谱测量，詹姆斯·韦伯太空望远镜（JWST）上的近红外光谱仪（NIRSpec）需要能够选择各种光谱带宽并将其分解成其所包含的波长的能力。这些功能是通过滤光轮组件（FWA）和光栅轮组件（GWA）实现的。 FWA的滤波器分别选择不同的光谱带宽，而GWA上的光栅产生特定的衍射特性以进行光谱分割。高光谱灵敏度以及同时检测各种物体光谱的能力导致对两种机制的光学器件的定位精度有很高的要求，以便将检测到的光谱链接到所观察到的二维图像对象。 NIRSpec机制（包括FWA和GWA）将在低温恒温器内部测试期间确定的低于42K的温度水平下运行。但是，由于在这样的设备中对被测物的访问非常有限，因此需要对这些机制的对齐和测试进行大量思考。对准需要基于模拟进行预加载，并且将测试简化为光学方法和电信号评估。本文介绍了用于各种对准步骤的方法，相应的测试及其测量精度以及机构中实现的精度性能。

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