1. Configuration and Tests
LYRA
the Lyman-alpha Radiometer onboard PROBA-2
LYRA Detectors:
Configuration and Tests
Ground Segment Progress Meeting
BELSPO Brussels 09 Jan 2007

2. Selected configurations
filter detector nominal FWHM measured
1-1 Ly XN + MSM /- nm nm
1-2 Herzberg + PIN nm nm
1-3 Aluminium + MSM nm (1)-2.4, nm
1-4 Zr (300nm) + AXUV20D 1-20 nm (1)-1.3, 6-15 nm
2-1 Ly XN + MSM /- nm nm
2-2 Herzberg + PIN nm nm
2-3 Aluminium + MSM nm (1)-1.4, nm
2-4 Zr (150nm) + MSM nm (1)-1.3, 6-12 nm
3-1 Ly N+XN + AXUV20A /- nm nm
3-2 Herzberg + PIN nm nm
3-3 Aluminium + AXUV20B nm (1)-2.4, nm
3-4 Zr (300nm) + AXUV20C 1-20 nm (1)-1.3, 6-15 nm

4. Tests (BESSY campaigns)
Flux linearity
Stability, drift
LEDs, dark current
Expected signal, purity
Homogeneity, flatfield
Integration time

5. Summary of Results Linearity Stability LEDs Signal, Purity
1-1 MSM
1-2 PIN
1-3 MSM ?
1-4 AXUV ??
2-1 MSM
2-2 PIN
2-3 MSM ?
2-4 MSM ??
3-1 AXUV
3-2 PIN ?
3-3 AXUV ?
3-4 AXUV ??

6. Recommendation Head 2 should be nominal
Head 1 should be used once a week
Head 3 should be used once a month
… depending on the behaviour of LYRA
(deterioration etc.)
Consequences for telecommanding and commissioning?