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CALIPSO
Space-Qualified Hardware
for the CALIPSO Lidar
Ron Schwiesow
Ball Aerospace and
Technologies Corp.
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
1
CALIPSO is a pathfinder for the
GTWS mission
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Lidar Working Group
18Jul02
CALIPSO
Flight-qualified Nd:YAG lasers demonstrated to
2109 pulses
Laser beam expanders with anti-feedback
provision
1-m beryllium telescope (OCA/Corning)
Flight-qualified PMT and APD detectors with
associated preamps
High-speed digitizer
Powerful, flight-qualified computer with fault
tolerance (General Dynamics PowerPC™ 603R)
Auxiliary instruments for context imaging
(Wide-field Camera and Imaging Infrared
Radiometer)
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
2
The payload includes 3 instruments
Star Tracker Assembly
X-Band Antenna
Telescope
Sunshade
Wide Field
Camera
Imaging Infrared
Radiometer
Integrated Lidar
Transmitter
Lidar Working Group
18Jul02
CALIPSO
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
3
The payload includes 3 instruments
CALIPSO
Wide Field
Camera
Platform Electrical
Interface Bracket
Star Tracker
Assembly
X-Band
Transmitter
Payload
Controller
Laser Electronics Unit
Lidar Receiver
Electronics
Receiver Power Supply
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
4
Monolithic optical bench supports
the lidar
CALIPSO
Lidar Instrument Core
Active
Boresight
Mechanism
APD
PMTs
Laser
Radiator
Optical
Bench
Laser
Optics
Modules
Telescope
Beam
Expander
Optics
ILT (Integrated
Lidar Transmitter)
Lidar Working Group
18Jul02
ILR (Integrated
Lidar Receiver)
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
5
Risk-reduction laser proved concept
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CALIPSO
2109 pulses
demonstrated
validated contaminationcontrol procedures
verified KTP doubler
operation
established
misalignment tolerance
showed benefits of
derated components
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
6
Laser optics modules are tested and
delivered
Flight Laser #1 in Sealed Canister
Lidar Working Group
18Jul02
CALIPSO
Flight Laser #2 Prior to Lid Closure
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
7
Laser burn-in is part of the
qualification process
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
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Beam-expander optics are delivered
and tested
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CALIPSO
All-reflective design
Mounts to laser
optics module
Beam expansion
13x
f/1.4 primary mirror
>0.98 reflectivity at
532 and 1064 nm
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
9
Laser vibration test is done with
mass model of beam expander
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
10
Laser functional test verifies
performance
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CALIPSO
110 mJ each
wavelength
20.25-Hz PRF
25-pm linewidth
at 532 nm
6-8 mm-mrad
beam quality
polarization
purity 3700:1
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
11
All-beryllium telescope has fast
primary and f/4.7 secondary
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
12
Tested telescope assembly has
been delivered from vendor
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
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First fold mirror assembly includes
field stop and flexure mounts
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
14
Refractive collimator and flexure
mounts tested as a subassembly
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
15
Dichroics, mirrors, and polarizing
beamsplitter tested separately
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
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Sandwich etalon filter for 532 nm
provides good optical performance
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
17
Sandwich etalon passed thermal
and mechanical qualification
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CALIPSO
Housing provides thermal
stabilization and uniformity
Etalon polished to
approximate wavelength,
angle-tuned to precise
wavelength, thermal tuned to
track changes
Bandpass 42 pm
Peak transmission >0.81
Contrast ratio >160
Birefringence <0.001 crosstalk
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
18
Flight APD includes preamp and
stabilization circuitry
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CALIPSO
Based on MOLA
design
QE 0.40
Noise
0.004 pW Hz-½
Bandwidth
4 MHz
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
19
Cabling mockup prepares for final
integration and test
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
20
Structures include optics bench,
sunshade, and housing
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
21
Composite structure is assembled
for testing
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
22
The composite structure is qualified
with mass models in place
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CALIPSO
Structure includes
sunshade
Components mounted
to outside of payload
housing
Optical bench floats
inside housing
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
23
Optical bench is a monolithic
composite structure
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
24
Optical bench is also tested with
mass models of components
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO
25
Wide-field camera is based on
standard CT-633 star tracker
CALIPSO
– Longer lens, narrower FOV than CT-633
– Neutral density filter with full aperture
– Bandpass filter 620 - 670 nm
– 512x512 CCD as push-broom scanner
– RS-422 synchronous serial I/O
Standard CT-633
Flight PWAs
Flt Lens Assembly
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
26
Imaging infrared radiometer is
developed by SODERN
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Based on Boeing microbolometer arrays
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Mirror for 2-point calibration
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6464 snapshot array
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3 spectral channels sequential
CALIPSO
Mirror Mechanism EM
Flight Infrared Sensor Module (IASI)
Lidar Working Group
18Jul02
Housing Structure Eng Model
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
27
Payload Simulator
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CALIPSO
Allows testing of
interface to
spacecraft platform
Currently in service at
Alcatel in France
Lidar Working Group
18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
28
Launch planned for April04
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Lidar Working Group
18Jul02
CALIPSO
Dual launch with CloudSat on dual launch
adapter fitting
Delta II 7420 launch vehicle
3-m standard fairing
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
29
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