HSI Course

1
Reflective vs. Emissive
Reflective Band Emissive Band Physics
Reflected sunlight Direct thermal
emission Complex phenomena Simpler phenomena
Surface reflectivity Surface
temperature Illumination geometry Emissivity
Phenomena Familiar Unfamiliar
2
Properties of MWIR/LWIR

• Day and Night Operations
• Fingerprint Spectral Region
• Material Identification
• Gas ID and Quantification
• Physics-Based Algorithms

3
Applications

• Camouflage Detection
• Bomb Damage Assessment
• Chemical Warfare Agents
• Terrain Classification
• Material Identification

4
SEBASS Systems
SHARP High Altitude Aircraft 60,000 ft
AHI Twin Otter - Low Altitude
Space Design
Analysis Center
Ground Based Mobile
5
SEBASS

• Capabilities
• MWIR/LWIR Hyperspectral Imager
• Airborne day/night capability
• Gas identification
• Solid material identification
• Precision thermometry T 0.01C
• Extrapolated to space system design
• Utilization
• Surveillance / Remote Sensing
• Gas effluent detection
• Geological / mineral mapping
• Battlespace characterization

SEBASS in Twin Otter
6
SHARP

• High fidelity measurement instrument
• Calibrated, low noise, well characterized
• Addresses signature phenomenology
• Background false alarm statistics
• Atmospheric path effects (mean and variance)
• Broad in situ signature database development
• Sensor and algorithm performance limits

Spatially Enhanced Broadband Array Spectrograph
System (SEBASS) High Altitude Research Project
(SHARP)

• Supports many operational scenarios

7
SEBASS Airborne Platforms
Twin Otter
SHARP Photo Not Available

• SEBASS developed as IRD SHARP
• 3.0 - 13.6 µm spectral coverage 3.0 - 13.6 µm
  spectral coverage
• 2,000 - 12,500 ft altitude 20,000 - 65,000 ft
  altitude
• 2 - 12.5 ft GSD (1 mrad IFOV) 2 - 6.5 ft GSD
  (100 µrad IFOV)
• Direct downlooking Down and oblique views
• Pushbroom nadir scan Backscanned whiskbroom
• NESR 0.4 - 0.7 µflicks NESR 0.1 - 1
  µflicks
• (depends on aircraft speed) (depends on
  mirror scan rates)

8
Applications/ Examples

• Detection Identification
• Redstone Arsenal Tests
• Bomb Damage Assessment
• White Sands Tests
• Chemical Warfare Agents
• National Test Site Releases
• Terrain Classification
• Yuma Proving Grounds

9
LWIR HSI Counter-CCD
Single Band LWIR
Camouflaged M1E1 Tank along Tree Line
10
LWIR Contrast Enhancement
Broad Band LWIR
T-72 Tank in Desert Clutter
11
C-Process Release (09/16/97)

• Real time flight display of an invisible
  chemical plume
• Simple Tetrachloroethylene filter