SPIRE Design Description - Research Services
SPIRE Design Description - Research Services
SPIRE Design Description - Research Services
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Draft <strong>SPIRE</strong> <strong>Design</strong> <strong>Description</strong> Document<br />
Subsystem<br />
Name<br />
Beam<br />
Steering<br />
Mechanism<br />
(BSM)<br />
FTS<br />
Mechanism<br />
(SMECm)<br />
FTS encoder<br />
amplifier<br />
(SMECp)<br />
Shutter<br />
Mechanism<br />
Photometer<br />
Calibration<br />
Source<br />
Spectrometer<br />
Calibration<br />
Source<br />
(SCAL)<br />
RF Filter<br />
Modules<br />
Photometer<br />
JFET Box<br />
Spectrometer<br />
JFET Box<br />
Detector<br />
Read-out &<br />
Control Unit<br />
(DRCU)<br />
FPU Control<br />
Unit (FCU)<br />
<strong>Description</strong> Unit Redundancy<br />
This mechanism allows the photometer and<br />
spectrometer fields of view to be stepped or chopped<br />
across the sky.<br />
The FTS moving mirrors drive mechanism and<br />
position measurement system. SMECm designates the<br />
mechanism and position encoder<br />
SMECp the cold pre-amplifier for the position encoder<br />
detectors.<br />
A shutter is required in the instrument for ground test<br />
to allow the detectors to see the correct radiation<br />
environment.<br />
25<br />
HSFPU No redundancy in the<br />
structure, mirror or<br />
flexure pivots.<br />
Redundancy in<br />
instrumentation,<br />
actuation and<br />
harnessing.<br />
HSFPU No redundancy in the<br />
structure, mirror or<br />
flexure pivots.<br />
Redundancy in<br />
instrumentation,<br />
actuation and<br />
harnessing.<br />
HSFPU Fully redundant<br />
HSFPU No redundancy as not a<br />
flight item.<br />
Calibration source for photometer HSFPU No redundancy on light<br />
guide and reference<br />
source. Full<br />
redundancy on<br />
electronics and<br />
harnesses.<br />
Calibration source for the spectrometer HSFPU Redundancy on<br />
reference source heater<br />
and thermometer. Full<br />
redundancy on<br />
electronics, heater and<br />
Each sub-system harness into the cold FPU must have<br />
an electrical RF filter to prevent EMI problems with<br />
the bolometers. These will be mounted in standard RF<br />
filter modules on the wall of the FPU box.<br />
JFET pre-amplifiers for photometer NTD germanium<br />
bolometers.<br />
JFET pre-amplifiers for spectrometer NTD germanium<br />
bolometers.<br />
Detector amplifier and digitisation chain and<br />
instrument control electronics. Conceptually this is a<br />
single unit however for accomodation reasons it will<br />
be split into two phyiscal units<br />
Contains the electronics for the power conversion and<br />
distribution to the DRCU; for the control and read-out<br />
of the thermometers; cooler; calibration sources and<br />
the cold mechanisms<br />
harnesses.<br />
HSFPU Fully redundant<br />
HSFTBp No redundancy. Failure<br />
of single JFET<br />
amplifier is a soft<br />
failure mechanism<br />
HSFTBs No redundancy. Loss<br />
of a single JFET<br />
amplifier is a soft<br />
failure mechanism<br />
HSDRC See below<br />
HSFCU Full redundancy
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