Micro Hyperspectral Systems For UAVs If a picture is worth 1000 words, a hyperspectral image is worth almost 1000 pictures Dr John P Ferguson Photonics & Analytical Marketing Ltd RSPSoc and NERC Cluster UAV Workshop University of Durham, 7-8 June 2011
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Micro Hyperspectral Systems For UAVs If a picture is worth 1000 words, a hyperspectral image is worth almost 1000 pictures Dr John P Ferguson Photonics.
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Micro Hyperspectral Systems
For UAVs
If a picture is worth 1000 words, a hyperspectral image is worth almost 1000
pictures
Dr John P FergusonPhotonics & Analytical Marketing Ltd
RSPSoc and NERC Cluster UAV WorkshopUniversity of Durham, 7-8 June 2011
TOPICS TO BE COVERED
Headwall PhotonicsExplanation of Hyperspectral ImagingSome applicationsThe Headwall Micro HyperspecImaging from UAVs
HEADWALL PHOTONICS INC
1976 - American Holographic, Inc.
2000 - Agilent Technologies acquisition
2003 – Headwall Photonics launched
Currently 40 employees
Factory in Fitchburg, Massachusetts, USA
Producers of imaging spectrometers, OEM spectral engines, original holographic gratings
Applications of Headwall Technology• Hyperspec V10 – Marine Ocean Buoy Project (MOBY)• Hyperspec VS30 – NRL airborne requirement for remote sensing and ocean
color monitoring• Hyperspec VS15 – USAF airborne mine detection in littoral zones • Hyperspec VS15 – USN Predator-based project for Project Warhorse • Hyperspec VS15 – NRL Ocean PHILLS sensor• Hyperspec VS15 – AFRL LWIR sensor for polarimetric sensing for battlefield
surveillance • Hyperspec VS25 – Selected by NASA for International Space Station deployment • Hyperspec VS25 – First UAV deployment• Hyperspec VS – Custom UV/MCP unit deployed for AFRL missile plume tracking • Hyperspec VS50 – Airborne SWIR sensor • Micro-Hyperspec VNIR and NIR – Introduced in 2006 for UAV and SUGV
deployment • Hyperspec-VNIR – NASA deployment for AVIRIS project augmentation• Hyperspec-VNIR, Hyperspec-NIR, Hyperspec-SWIR – integrated instruments for
Applications of Headwall Hyperspectral SystemsSpace
Piloted
UAV
Ground-based
Handheld Reconnaissance
Base protection
Multiple Platforms
Small Satellite
WHAT IS HYPERSPECTRAL IMAGING?
• Collection of high resolution spectral detail over a large spatial and broad wavelength region from within each pixels instantaneous field of view
• Also known as imaging spectroscopy, chemical sensing• Chemical/spectral imaging within spatial dimension
• Many definitions– Common requirement = > ~ 100 spectral bands– No definition has explained spatial requirements
Example – Airborne remote sensing
Image Source: BAE Systems
THE VISIBLE LIGHT SPECTRUM
What information can the spectrum tell us?
The type of building material used
The type of vegetation
The rock strata
The type of ground
How does it work?
AN OUTLINE OF HYPERSPECTRAL IMAGING
A TYPICAL SCENE
THE CAMERA’S VIEW
THE VIEW THROUGH A SLIT - PIXELS IN ROW 7
PIXELS IN ROW 11
PIXELS IN ROW 17
THE HYPERSPECTRAL DATA
CLOSER TO REALITY
A HYPERSPECTRAL DATA CUBE
Some technical stuff
25 Proprietary and Confidential
Hyperspectral Design Options
Aberration-Corrected Concentric– All-reflective system– Three reflective surfaces
Prism-Grating-Prism– Transmission-based grating system
Headwall’s imager design optimized for …
Imaging performance – • Aberration-corrected
• Minimal stray light• High signal-to-noise• High dynamic range
• High spectral/spatial resolution• Efficiency across total spectral range
Deployment in harsh environments• Ruggedized & durable• Small, compact size
• Minimal thermal expansion
Attributes- Integrated spectrometer solution - High spectral/spatial resolution- Very tall image slit - Very low image distortion- Low stray light, high signal-to-noise- Small package size- Flight hardened no moving parts
THE HEADWALL PATENTED SPECTROGRAPH DESIGN
EntranceSlit
DetectorPlane
Original holographichigh efficiency convex grating