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