Transcript Заголовок слайда отсутствует

ASI/Roscosmos Meeting
Rome, December 20, 2005
T-170-M telescope, cameras and
the FGS:
interfaces, requirements etc.
Alexander MOISHEEV
Lavochkin Association
[email protected]
The WSO/UV S/C
S/C main features
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Platform (Service Module –SM)
Mass of S/C with propellant
SM mass
Mass of propellant of the SM
Propellant of the SM:
• Mass of the P/L
• Pointing accuracy with star sensors
• Accuracy of pointing and stabilization
with the FGS;
Navigator
2900 kg
1300 kg
150 kg
Hydrazine
1600 kg
4 (2) arc.min.
0.1 arc.sec
S/C main features (ctd.)
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Slewing rate
Maximal exposure time
Download rate of scientific data
H/K data transmission rate
Electric power available for the P/L
For science instruments of the
Focal Plane Compartment
• Voltage of electric power supply
up to 0.1 deg/s
30 hours
up to 1 Mbaud
up to 32 Kbps
750 W
300 W
27±1,35V
Initial design requirements to T-170M
Optical system
Ritchey – Chretien aplanat
Aperture diameter
1700 mm
Telescope f-number
10.0
FOV
0.50 (150mm in diameter)
Wavelengths range
Primary wavelength
100 – 350 nm (+visible)
200 nm
Optical quality
Diffraction optics at the FOV center
Mass
1570 kg (1600 with adapter truss)
Size
5.67м ×2.30 m (transport)
8.43 * 2.3 m (operational)
T-170M FP layout
HIRDES slits are placed 50mm off-axis
SFUV cameras: FOV- 6 arcmin circular
SFVIS camera: FOV- 6x6 arcmin squared
FOV’s centers are located 30mm off-axis
LFUV cameras: FOV- 1.2 arcmin circular
LFVIS camera: FOV- 1.2x1.2 arcmin
squared
FOV’s centers are located 35mm off-axis
FGS cameras
FOV- 4x3 arcmin rectangular
FOV’s centers are located 60mm off-axis
Optics Quality Control System is on axis
FOV - non
Spectropolarimeter (excluded)
FOV – 6 arcmin circular
FOV’s center is located 60 mm off-axis
Optical Adjustment Control System is
placed 60mm off-axis (proposed)
Exploded view of the instrumental
compartment
Field cameras
Concept:
All cameras in one unit –
Field Cameras Unit
For estimates of size,
mass, electrical
properties etc the
TAUVEX camera
(Israel) is considered
as prototype of the UVcameras
Field Cameras Unit (FCU)
LF-UV2
SF-UV1
FCU structural design
• 6 cameras
- 3 cameras for operation in the standard mode F/10
( 2 - SFUV cameras, 1 - SFVIS camera);
- 3 cameras for operation in the long focus mode (f/50)
(2 - LFUV cameras, 1 - SFVIS camera).
• Light-splitting unit;
• FCU electronic subsystem (Module of Control and
Processing of Data, Power Supply Sources);
• FCU structure, unifying all FC in the monoblock unit.
FCU features
• Spectral ranges:
- UV
- visible
• Image quality
- SFUV cameras, SFVIS camera
- LFUV camera, LFVIS camera
• Mass
of each FC not higher than
• Power consumption
of each FC not higher than
• Maximal power consumption
of the FCU not higher than
110 - 350 nm
350 – 700 nm
0.3 arc.sec;
0.1 arc.sec.
1 kg
15 W
50 W
FCU accommodation
Thermal environment of the field
cameras
• Operation temperature range, C
• Temperature range during assembling
and tests
• Temperature range during storage
and transportation of the telescope
• Critical temperature range
Toutgas should be defined
+10 -- +30
+18 -- +25
+5 -- +35
-40 -- Toutgas
The Fine Guidance System - FGS
The concept:
The FGS uses images of guiding stars from the T170M
telescope
FGS detectors are firmly attached to optical bench in
the nearest vicinity of the spectrographs entrance
slits
The FGS consists of:
• three identical detectors (CCD(?) + electronics)
• common Data Processing Unit (DPU)
• software including Master Catalogue
Z
A-A
Spectrometer slit
13.3
22.7
Spectrometer
base
25
4
43.3
13
A
16
5
Y
26
17
120
16
Area (cavity) for
the guiding sensor
mounting
34
68
98
A
Detectors lightsensitive surface
16.5
FGS requirements
• General: FOV and throughput should provide with
the capacity to detect at the level of S/N > 3 at least
two guiding stars for the exposure time defined by
angular velocity drift of the S/C
• Mass of sensor
0.25 kg
• Power consumption of sensor
0.6 W
not higher than
• Mass of the Data Processing Unit
7 kg
• Power consumption of the DPU
35 W
not higher than
Thank you for your attention!