Demonstration of LWIR channeled spectro-polarimeter (Conference Presentation)

Kira A. Hart; Giovanni De Amici; Todd Horne; Meredith Kupinski; Kyler Langworthy; Adriana Stohn; Dong L. Wu; Russell Chipman

doi:10.1117/12.2532075

10 September 2019 Demonstration of LWIR channeled spectro-polarimeter (Conference Presentation)

Kira A. Hart, Giovanni De Amici, Todd Horne, Meredith Kupinski, Kyler Langworthy, Adriana Stohn, Dong L. Wu, Russell Chipman

Author Affiliations +

Proceedings Volume 11132, Polarization Science and Remote Sensing IX; 1113207 (2019) https://doi.org/10.1117/12.2532075
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

A compact long wave infrared (LWIR) channeled spectro-polarimeter (IRCSP) has been developed for integration into the ESTO-funded Submm-Wave and LWIR Polarimeters (SWIRP) project to measure the microphysical properties of cloud ice. The IRCSP rotates incident linearly polarized light using the combination of a quarter waveplate with a fast axis at 45◦ and a thick birefringent crystal; the output polarization state’s orientation is then a function of wavelength. To modulate and then measure the rotated light, a subsequent wiregrid linear polarizer tilted at 20◦ generates two output paths with opposite polarities in reflection and transmission to enable joint radiometric and polarimetric measurement and correct for atmospheric attenuation. The two symmetric optical paths following the linear polarizer each consist of a diffraction grating and uncooled microbolometer to simultaneously measure the resulting intensity fringes. Angle and degree of linear polarization (AOLP, DOLP) are retrieved across 8.5-12.5 µm with 1 µm resolution using Fourier decomposition of the modulated spectrum. The IRCSP will not only measure H-V variance but will produce the first full linear Stokes measurements (I, Q, and U) of upper-tropospheric cirrus clouds in the LWIR. Following thermal and polarimetric calibration, the polarimeter is expected to achieve 0.5% DOLP accuracy over 90% of the spectral band.

Conference Presentation

Citation Download Citation

Kira A. Hart, Giovanni De Amici, Todd Horne, Meredith Kupinski, Kyler Langworthy, Adriana Stohn, Dong L. Wu, and Russell Chipman "Demonstration of LWIR channeled spectro-polarimeter (Conference Presentation)", Proc. SPIE 11132, Polarization Science and Remote Sensing IX, 1113207 (10 September 2019); https://doi.org/10.1117/12.2532075

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Long wavelength infrared

Polarimetry

Clouds

Linear polarizers

Modulation

Polarization

Crystals

Show All Keywords

Keywords/Phrases

Search In:

Publication Years