SIAMOIS, kickoff meeting, Paris, 15-16 may, 20061
SIAMOIS: optical test benchBOSS (Banc Optique SiamoiS)
Pernelle BernardiObservatoire de Paris-Meudon, LESIA
SIAMOIS, kickoff meeting, Paris, 15-16 may, 20062
The test bench objectives
Simulation of all the components, except the interferometer:
• Far field of the optical fiber
• Qualification of the optical fiber + connectors
• Definition of the mechanical interface of the 2 fibers
• Imaging spectra on the camera
• Testing acquisition softwares and data processing
SIAMOIS, kickoff meeting, Paris, 15-16 may, 20063
Design of the test bench
beamsplitter
QTHsource optical fibers
collimator
2 plane mirrors
Diffraction grating
Segmentary mirror
Andorcamera
focusing objective
calibration channel
signal channel
bandpass filter400-560nm
narrow bandpass filter
SIAMOIS, kickoff meeting, Paris, 15-16 may, 20064
Far field of the fiber
The far field of the optical fiber defines the size of the 5 zones of the steps mirror.
37mm
Size of the beam
27.6mm
Size of the CoRoT CCD
QTHsource
optical fiber
band-pass filter (400-560nm)
CCD on translation stages
F/5 F/4
Acquisition of the beam profile with a CCD.
SIAMOIS, kickoff meeting, Paris, 15-16 may, 20065
• Two qualifications at -80°C– Optical fiber only optical tests during cooling– Optical fiber + connectors optical tests before/after cooling
• Purchase of several fibers:– Two manufacturers– Two different jackets: PVC and metal
Qualification of the optical fiber
QTHsource
band-pass filter (400-560nm)
CCD on translation stages
optical fiber
dewar
dewar
band-pass filter (400-560nm)
optical fiber power meter
Measurement of the far field uniformity
Measurement of the variations of the fiber transmission
QTHsource
SIAMOIS, kickoff meeting, Paris, 15-16 may, 20066
Mechanical interface of the fibers
• Specification: distance of 128 µm between the two fiber cores (signal & calibration) at the collimator focus
• Design of the mechanical interface of the 2 fibers:
• Test of the robustness of this component
• Evaluation of the constraints on the fibers
signal fiber
calibration fiber
128 ± 20µm
50µm
65µm
SIAMOIS, kickoff meeting, Paris, 15-16 may, 20067
Implementation of the camera
• Model: iDus DU440– Active pixels: 1024 x 255– Pixel size: 26 x 26µm– Back illuminated, AR coated for optimal performance in the 350nm region– Full well capacity: 465 ke- (typical)– Read noise: 4 @ 33kHz– Typical minimum temperature: -70°C (air cooled)
• Andor software (LabView)– Acquisition– Real-time data display– Shutter control
• Data processing– 2 spectra– Calibration source
SIAMOIS, kickoff meeting, Paris, 15-16 may, 20068
Conclusion
• State of the test bench today: (in Meudon labs, ex CoRoT CCD test bench)
• Waiting for equipment…after many difficulties to order it!
• Beginning of the tests scheduled for june 2006
• 2 students
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