Characterization and use of an acousto-optic tunable filter for hyperspectral remote sensing

Author

Douglas Michael Papenmeier

Keywords and Phrases

Acousto-optic; AOTF; Infrared imaging; Passive infrared; TAS; Tl3AsSe3; Remote sensing; Hyperspectral imaging

Abstract

"This study reports the characterization of a noncollinear Tl₃AsSe₃ acousto-optic tunable filter (AOTF) for use in an 8 to 12 micron hyperspectral imaging system. Electronic testing was performed to determine the filter's resonance points and the variations in impedance as a function of the acoustic frequency. The dependence of the filter's diffraction efficiency on the applied voltage, frequency, and dissipated power in the crystal was determined. Bandwidth measurements of the diffracted beam were performed using an FT-IR, and found to be independent over the range of applied power introduced into the filter. After characterization, the AOTF was placed in an optical system designed to gather light from a distant object, collimate a beam, pass the beam through the AOTF, and reform an image onto the array of an infrared camera. This optical system was then used to collect images of a remote sample cell containing dimethyl methyl phosphonate at elevated temperatures. Several wavelengths were selected on- and off-peak for three absorbance peaks. These images were collected for five different DMMP concentrations and calibration curves were calculated. The potential problem of wavelength jumping, where changing wavelength moves the diffracted beam spatially, was also analyzed. This is believed to be the first demonstration of an AOTF-based remote sensor for detection of militarily significant compounds"--Abstract, page iv.

Advisor(s)

Merrow, Clifton N.

Committee Member(s)

Kapila, Shubhender
Whitefield, Philip D.
Ma, Yinfa
Watkins, Steve Eugene, 1960-

Department(s)

Chemistry

Degree Name

Ph. D. in Analytical Chemistry

Publisher

University of Missouri--Rolla

Publication Date

Spring 2004

Journal article titles appearing in thesis/dissertation

• Electrical and spectral characterization of TAS LWIR AOTF
• Preliminary results for a LWIR AOTF imager

Pagination

ix, 53 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2004 Douglas Michael Papenmeier, All rights reserved.

Document Type

Dissertation - Citation

File Type

text

Language

English

Subject Headings

Acoustooptical devicesChemical agents (Munitions) -- Remote SensingInfrared imagingMultispectral photography

Thesis Number

T 8723

Print OCLC #

70860935

Recommended Citation

Papenmeier, Douglas Michael, "Characterization and use of an acousto-optic tunable filter for hyperspectral remote sensing" (2004). Doctoral Dissertations. 1625.
https://scholarsmine.mst.edu/doctoral_dissertations/1625