The HUT telescope module is attached to the Astro cruciform by means of kinematic mounts that are configured to maintain co-alignment with the other Astro instruments. The HUT electronics module is located on the integrated radiator system (IRS) to provide efficient rejection of heat generated by the electronic components. The IRS is also mounted on the cruciform structure with the other instruments. The HUT optics, spectrometer, and detector are all contained in a structure that consists of an environmental control canister (ECC), a shutter door assembly, and a forward baffle section as shown in Figure 2-1. The forward baffle section, located at the front of the ECC, acts as a light baffle and thermal transition element. The shutter doors provide for protection against contamination and excessive light levels and can allow for the observation of bright sources by restricting the aperture. The ECC provides for contamination protection and the maintenance of a stable thermal environment. The principal elements contained within the ECC are the primary mirror and mirror cell, the metering cylinder and spider arms, the spectrometer, the detector, and the acquisition TV camera. They are shown in Figure 2-2 and are described below.
 |
|