1
CALIPSCALIPSOO
Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Space-Qualified Hardware for the CALIPSO Lidar
Ron Schwiesow Ball Aerospace and Technologies Corp.
CALIPSCALIPSOO
2Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
CALIPSO is a pathfinder for the GTWS mission
Flight-qualified Nd:YAG lasers demonstrated to 2109 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)
CALIPSCALIPSOO
3Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
The payload includes 3 instruments
Telescope Sunshade
Integrated Lidar Transmitter
Wide Field Camera
Star Tracker Assembly X-Band Antenna
Imaging InfraredRadiometer
CALIPSCALIPSOO
4Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
The payload includes 3 instruments
Platform Electrical Interface Bracket
Payload Controller
Star Tracker Assembly
Lidar Receiver Electronics
X-Band Transmitter
Laser Electronics Unit
Receiver Power Supply
Wide Field Camera
CALIPSCALIPSOO
5Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Monolithic optical bench supports the lidar
ILT (Integrated Lidar Transmitter)
ILR (Integrated Lidar Receiver)
Lidar Instrument Core
Beam Expander
Optics
Active Boresight
Mechanism
Laser Optics
Modules
Laser Radiator
PMTs
Telescope
Optical Bench
APD
CALIPSCALIPSOO
6Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Risk-reduction laser proved concept
2109 pulses demonstrated
validated contamination-control procedures
verified KTP doubler operation
established misalignment tolerance
showed benefits of derated components
CALIPSCALIPSOO
7Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Laser optics modules are tested and delivered
Flight Laser #2 Prior to Lid Closure Flight Laser #1 in Sealed Canister
CALIPSCALIPSOO
8Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Laser burn-in is part of the qualification process
CALIPSCALIPSOO
9Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Beam-expander optics are delivered and tested
All-reflective design Mounts to laser
optics module Beam expansion
13x f/1.4 primary mirror >0.98 reflectivity at
532 and 1064 nm
CALIPSCALIPSOO
10Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Laser vibration test is done with mass model of beam expander
CALIPSCALIPSOO
11Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Laser functional test verifies performance
110 mJ each wavelength
20.25-Hz PRF 25-pm linewidth
at 532 nm 6-8 mm-mrad
beam quality polarization
purity 3700:1
CALIPSCALIPSOO
12Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
All-beryllium telescope has fast primary and f/4.7 secondary
CALIPSCALIPSOO
13Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Tested telescope assembly has been delivered from vendor
CALIPSCALIPSOO
14Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
First fold mirror assembly includes field stop and flexure mounts
CALIPSCALIPSOO
15Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Refractive collimator and flexure mounts tested as a subassembly
CALIPSCALIPSOO
16Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Dichroics, mirrors, and polarizing beamsplitter tested separately
CALIPSCALIPSOO
17Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Sandwich etalon filter for 532 nm provides good optical performance
CALIPSCALIPSOO
18Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Sandwich etalon passed thermal and mechanical qualification
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
CALIPSCALIPSOO
19Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Flight APD includes preamp and stabilization circuitry
Based on MOLA design
QE 0.40 Noise
0.004 pW Hz-½
Bandwidth 4 MHz
CALIPSCALIPSOO
20Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Cabling mockup prepares for final integration and test
CALIPSCALIPSOO
21Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Structures include optics bench, sunshade, and housing
CALIPSCALIPSOO
22Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Composite structure is assembled for testing
CALIPSCALIPSOO
23Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
The composite structure is qualified with mass models in place
Structure includes sunshade
Components mounted to outside of payload housing
Optical bench floats inside housing
CALIPSCALIPSOO
24Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Optical bench is a monolithic composite structure
CALIPSCALIPSOO
25Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Optical bench is also tested with mass models of components
CALIPSCALIPSOO
26Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Wide-field camera is based on standard CT-633 star tracker
Flt Lens Assembly
–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
CALIPSCALIPSOO
27Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Imaging infrared radiometer is developed by SODERN
Housing Structure Eng Model
Mirror Mechanism EM
Flight Infrared Sensor Module (IASI)
Based on Boeing microbolometer arrays
Mirror for 2-point calibration
6464 snapshot array
3 spectral channels sequential
CALIPSCALIPSOO
28Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Payload Simulator
Allows testing of interface to spacecraft platform
Currently in service at Alcatel in France
CALIPSCALIPSOO
29Lidar Working Group18Jul02
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
Launch planned for April04
Dual launch with CloudSat on dual launch adapter fitting
Delta II 7420 launch vehicle 3-m standard fairing