<MUPUS> Status Graz, 24/25 Oct 2013

MUPUS Team Meeting

2 LOWG#12, DLR Cologne 18-20th of November 2008

PEN inflight calibration 4

14 inflight calibration points between -107°C and -91°C 3 PEN sensors (No 2,7,10) showed jump (< 0.5 K) in R-T characteristic after

THC power calibration in PC#12 No changes between PC#12 and PC#13 => correction possible No active heating before FSS !

3 LOWG#12, DLR Cologne 18-20th of November 2008

MUPUS PEN Inflight Calibration 5

R0(-100°C) and TCR(-100°C) from 16 inflight calibration points between -107°C and -91°C

Corresponds to TCR ~ 0.0022 when evaluated with standard T0=0°C

4 LOWG#12, DLR Cologne 18-20th of November 2008

(prelimenary) PEN uncertainty budget

Uncertainty(@T=-200°C, k=2) = 3.2 K uncertainties of reference resistors R100, R20 uncertainty of h/k-2 Pt-100 (Class B, incl. line resistance correction ~ 1K / 31/2)

Precision(@T=-200°C, k=2) = 2.6 K Uncertainty due to linear extrapolation Uncertainty due to neglection of quadratic term (2-3 10-7 K-2, FS measurement) Uncertainty due to imperfect wire correction (assumed 20% of nominal Rw) Uncertainty due to assumption of homogeneous PEN temperature (assumed 0.5 K / 31/2) Uncertainty due to electronics nonlinearity (FS, 0.25 K / 31/2) Uncertainty due to electronics noise (0.016 K, FM cruise checkouts)

1-Sigma

5 LOWG#12, DLR Cologne 18-20th of November 2008

TM inflight calibration 2

6-25 µ13-15 µ

TM sensors lost sensitivity (but stable during cruise)!

6 LOWG#12, DLR Cologne 18-20th of November 2008

TM inflight calibration 4

6-25 µm 13-15 µm

Extrapolation to TV test conditions:S/S0 ~ 0.72 (6-25 µm)

S/S0 ~ 0.86 (13-15 µm)

7 LOWG#12, DLR Cologne 18-20th of November 2008

Depth Sensor

FM FS

DS values stable since 2006 (no data earlier) Slight dependence on balcony temperature (similar for FS) Precision (Repeatibility, FS) ~ 75 DU (~ 3.5 mm)

8 LOWG#12, DLR Cologne 18-20th of November 2008

ANC-M (accelerometer)

FM FS

ANC-M Offsets stable since PC#4 (Nov 2006) Slight dependence on board (EBox) temperature ~ -1 mV/K Noise stable at 0.6-0.7 mV

9 LOWG#12, DLR Cologne 18-20th of November 2008

MUPUS FM Status Summary

All MUPUS hardware fully operational when entering hibernation ComDPU working only at ½ nominal speed (known since 2006)

No indications for h/w changes during cruise with one exception: 3 PENEL sensors showed jump in R0 (~0.5-1 K) after (very low power) THC

heating

Calibration problems exist: PENEL: extrapolation due to short baseline of inflight calibration points TM: significant sensitivity loss already pre-launch

10 LOWG#12, DLR Cologne 18-20th of November 2008

MUPUS RM Status

EQM DPU killed in Nov 2012 Stupid handling error by the project manager !

Replaced by last FM-series (reserve) DPU stored at DLR

RM functional

BUT: new PENEL-FS problem Occured after insertion tests with SESAME at Philae GRM

Strange: everything ok during all functional tests including the last one before switch-off

No valid measurements anymore when red tag jointer connecting PENEL electrical to structural GND close

Everything ok when red tag jointer open !

11 LOWG#12, DLR Cologne 18-20th of November 2008

Additional slides

12 LOWG#12, DLR Cologne 18-20th of November 2008

MUPUS PEN Inflight Calibration 1

Inflight calibration needed to cover low T expected for the comet

Method: Use Pt-100 in the holder as reference Assume that PEN tube and holder at the

same temperature in equilibrium (before PENEL switched on, justified by TV test with PEN FS)

Interpolate resistance backward in time to start of PENEL preheating (equilibrium)

=> Ri=Ri(Tref), i=1,2,…,16

PEN1

PEN16

TCU-MUPUS-DD

Pt-100

PENEL, T=-50°C

13 LOWG#12, DLR Cologne 18-20th of November 2008

MUPUS PEN Inflight Calibration 3Backward Extrapolation

Calibration (holder) Pt-100 Nearly linear increase of R during first 30 min.

Backward extrapolation gives reasonable R(T) point !(random) uncertainty estimate ~ 0.5 K (neglecting deviations from homogeneity assumption)+ systematic uncertainty of Tholder ~ 0.8 K

PENEL heat wavePENEL heat wave

14 LOWG#12, DLR Cologne 18-20th of November 2008

MUPUS TM Calibration 1Thermopile principle:T-differences between sensor and object => Uth

TSens must be measured separately !

Lens

Aperture stop

P t-1000

D etector

B lackbody

0 0

),(),()(),(),(),(),()( dTBTBvdTBTBvdTBTBvASU refBBBBrefHHrefdth

Object radiation Housing radiation Blackbody radiation