Short wave infrared imaging spectrometer with simultaneous thermal imaging

William R. Johnson; Daniel W. Wilson; Alejandro Diaz

doi:10.1117/12.860789

13 August 2010 Short wave infrared imaging spectrometer with simultaneous thermal imaging

William R. Johnson, Daniel W. Wilson, Alejandro Diaz

Proceedings Volume 7812, Imaging Spectrometry XV; 781202 (2010) https://doi.org/10.1117/12.860789
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

A computed tomographic imaging spectrometer (CTIS) has been developed to allow simultaneous shortwave infrared (SWIR: 1-1.4 μm) spectral imaging and mid-wave infrared (MWIR: 3-5 μm) thermal imaging. The instrument utilizes a mechanically cooled indium antimonide focal plane array which is optically coupled using an Offner relay to a state-of the-art two-dimensional grating. The grating is a computer-generated hologram design fabricated by electron-beam lithography on a convex substrate. The system performs shapshot capture of the spatial and spectral information in a scene, enabling transient events to be characterized. The shortwave spectral information in the higher diffraction orders was reconstructed using existing expectation maximization methodologies while a co-registered thermal image from the zerothorder was analyzed. A co-registered contour map of the shortwave information was displayed superimposed on the thermal image and processed for accurate retrieval of scene knowledge. Spectral accuracy and radiometric test and evaluation results such as noise equivalence temperature difference (NEDT) and minimum resolvable temperature difference (MRTD) are presented for this new spectral imager and a general explanation is given for the theory of its tomographic operation.

Citation Download Citation

William R. Johnson, Daniel W. Wilson, and Alejandro Diaz "Short wave infrared imaging spectrometer with simultaneous thermal imaging", Proc. SPIE 7812, Imaging Spectrometry XV, 781202 (13 August 2010); https://doi.org/10.1117/12.860789

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available