Monitoring Herschel Telescope Temperatures
We need to monitor the temperature of the Herschel Telescope as it affects the FTS pipeline tasks. This is particularly important during Comissioning and PV phases.
There is a definition of a satellite housekeeping product in the
Auxiliary Products Specification. This lists the temperature parameters and details their APID, type and sub-type. Unfortunately the satellite housekeeping product will not be implemented, but PACS are working on an implentation using
BinStruct to produce a Trend Analysis product for each operational day.
Herschel Auxiliary Products Specification document
(on livelink. See Section 9 on p.25)
In summary, the temperature sensors we need are:
From CCUA
Two source packets are possible, both with TYPE=3, SUBTYPE=25, APID=18 and either PI1=9752 or PI1=22820. In both cases, the corresponding SCOS-2000 packet has SPID=260141999.
M1 temperature |
T331 PT1000 |
TM raw parameter KM253302 |
M1 temperature |
T333 PT1000 |
TM raw parameter KM254302 |
M1 temperature |
T335 PT1000 |
TM raw parameter KM255302 |
M1 temperature |
T337 PT1000 |
TM raw parameter KM256302 |
M2 temperature |
T339 PT1000 |
TM raw parameter KM257302 |
M2 temperature |
T341 PT1000 |
TM raw parameter KM258302 |
From CCUB
Two source packets are possible, both with TYPE=3, SUBTYPE=25, APID=18 and either PI1=10922 or PI1=23600. In both cases, the corresponding SCOS-2000 packet has SPID=260144999.
M1 temperature |
T332 PT1000 |
TM raw parameter KM248303 |
M1 temperature |
T334 PT1000 |
TM raw parameter KM249303 |
M1 temperature |
T336 PT1000 |
TM raw parameter KM250303 |
M1 temperature |
T338 PT1000 |
TM raw parameter KM251303 |
M1 temperature |
T340 PT1000 |
TM raw parameter KM252303 |
M2 temperature |
T342 PT1000 |
TM raw parameter KM262303 |
The positions of these sensors on the mirrors are given in the
Herschel/Planck User Manual, Chapter 5,
Extra Payload and non SVM Equipment. The following figures and explanation are from Issue 3.2 of this document:
Reading the temperatures
To convert the packets, we need the spacecraft MIB. This should be loaded onto the machines at ESAC that run the SPG, but we don't have it at RAL to test any scripts at the moment. The spacecraft MIB is loaded in SCOS on the PISA machines at the MOC.
What BinStruct is needed for is to apply the conversion and interpret the packets using the spacecraft MIB.
We tested whether these parameters are connected by examining SCOS on the machine at Kourou. This shows that these parameters do contain real temperatures at the moment:
--
EdwardPolehampton - 23 Feb 2009