The soft x-ray spectrometer was designed to operate onboard the Japanese Hitomi (ASTRO-H) satellite. In the beam of this instrument, there was a filter wheel containing x-ray filters and active calibration sources. This paper describes this filter wheel. We show the purpose of the filters and the preflight calibrations performed. In addition, we present the calibration source design and measured performance. Finally, we conclude with prospects for future missions.
Proc. SPIE. 8449, Modeling, Systems Engineering, and Project Management for Astronomy V
KEYWORDS: Human-machine interfaces, Aerospace engineering, Interfaces, Process control, Software development, Systems engineering, Space operations, Systems modeling, Device simulation, Instrument modeling
The use of resources in the cradle-to-grave timeline of a space instrument might be significantly improved by
considering the concept of usability from the start of the mission. The methodology proposed here includes giving early
priority in a programme to the iterative development of a simulator that models instrument operation, and allowing this
to evolve ahead of the actual instrument specification and fabrication. The advantages include reduction of risk in
software development by shifting much of it to earlier in a programme than is typical, plus a test programme that uses
and thereby proves the same support systems that may be used for flight.
A new development flow for an instrument is suggested, showing how the system engineering phases used by the space
agencies could be reworked in line with these ideas. This methodology is also likely to contribute to a better
understanding between the various disciplines involved in the creation of a new instrument. The result should better
capture the science needs, implement them more accurately with less wasted effort, and more fully allow the best ideas
from all team members to be considered.
The alignment of the JWST NIRSpec spectrograph will use a customised set of optical light sources, imagers and wavefront sensors, which form part of the Optical Ground Support Equipment (OGSE). This has been developed by the Mullard Space Science Laboratory (MSSL) and the Centre for Advanced Instrumentation (CfAI) to be used at the Astrium GmbH, Ottobrunn (Germany) during NIRSpec integration. This paper describes the five precision illumination sources which form a key part of NIRSpec OGSE, and the optomechanical design of the three Shack-Hartmann wavefront sensors used.
The main design features and the early findings of the Rosat XUV wide field camera (WFC) are discussed. The most important data on the WFC telescope and detectors are presented. The WFC operational features, observing efficiency, filter performance, thermal performance star tracker performance, and single-event upsets are discussed. The first WFC images are compared with preflight calibration data.