Calibration methodology and performance characterization of a polarimetric hyperspectral imager

Joel G. Holder; Jacob A. Martin; Jeremey Pitz; Joseph L. Pezzaniti; Kevin C. Gross

doi:10.1117/12.2053783

21 May 2014 Calibration methodology and performance characterization of a polarimetric hyperspectral imager

Joel G. Holder, Jacob A. Martin, Jeremey Pitz, Joseph L. Pezzaniti, Kevin C. Gross

Proceedings Volume 9099, Polarization: Measurement, Analysis, and Remote Sensing XI; 90990J (2014) https://doi.org/10.1117/12.2053783
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

Polarimetric hyperspectral imaging (P-HSI) has the potential to improve target detection, material identification, and background characterization over conventional hyperspectral imaging and polarimetric imaging. To fully exploit the spectro-polarimetric signatures captured by such an instrument, a careful calibration process is required to remove the spectrally- and polarimetrically-dependent system response (gain). Calibration of instruments operating in the long-wave infrared (LWIR, 8μm to 12 μm) is further complicated by the polarized spectral radiation generated within the instrument (offset). This paper presents a calibration methodology developed for a LWIR Telops Hyper-Cam modified for polarimetry by replacing the entrance window with a rotatable holographic wire-grid polarizer (4000 line/mm, ZnSe substrate, 350:1 extinction ratio). A standard Fourier-transform spectrometer (FTS) spectro-radiometric calibration is modified to include a Mueller-matrix approach to account for polarized transmission through and polarized selfemission from each optical interface. It is demonstrated that under the ideal polarizer assumption, two distinct blackbody measurements at polarizer angles of 0°, 45°, 90°, and 135° are sufficient to calibrate the system for apparent degree-of-linear-polarization (DoLP) measurements. Noise-equivalent s₁, s₂, and DoLP are quantified using a wide-area blackbody. A polarization-state generator is used to determine the Mueller deviation matrix. Finally, a realistic scene involving buildings, cars, sky radiance, and natural vegetation is presented.

Citation Download Citation

Joel G. Holder, Jacob A. Martin, Jeremey Pitz, Joseph L. Pezzaniti, and Kevin C. Gross "Calibration methodology and performance characterization of a polarimetric hyperspectral imager", Proc. SPIE 9099, Polarization: Measurement, Analysis, and Remote Sensing XI, 90990J (21 May 2014); https://doi.org/10.1117/12.2053783

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