Development and testing of a MWIR Fabry-Perot interferometer for hyperspectral imaging

Robert Ryan; Richard G. Madonna; Theodore W. Hilgeman; John D. Hulsmann; William C. Van Nostrand; Lawrence Lesyna; Nils J. Fonneland; J. Michael; Lewis L. Smith; S. Mielke

doi:10.1117/12.278938

31 October 1997 Development and testing of a MWIR Fabry-Perot interferometer for hyperspectral imaging

Robert Ryan, Richard G. Madonna, Theodore W. Hilgeman, John D. Hulsmann, William C. Van Nostrand, Lawrence Lesyna, Nils J. Fonneland, J. Michael, Lewis L. Smith, S. Mielke

Author Affiliations +

Proceedings Volume 3118, Imaging Spectrometry III; (1997) https://doi.org/10.1117/12.278938
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

This paper describes the theory of design, operation, and testing of a tunable MWIR Fabry-Perot interferometer operating in low orders. This device is called the agile bandpass tunable filter (ABTF) due to the fact that the spectral bandwidth can be changed by a large factor by changing the order. In first order the system can be tuned over the entire 3.5-5 micrometers spectral region with only a single order sorting filter. We provide a short introduction to tunable filters an then briefly discuss the requirements that low order operation places on the Fabry-Perot dielectric mirrors. Operation in low orders forces one to abandon the classical Fabry-Perot approximation that the mirrors are negligibly thin compared to the plate separation. Rather, one must now account for the phase properties of the dielectric stack mirrors as they produce phase effects comparable to the plate separation. We next address the issue of control of the Fabry-Perot. This is accomplished through a closed-loop system using capacitive sensor on the Fabry-Perot flats to measure the separation of the plates. Additionally we describe how the ABTF is characterized using a FTIR to measure the bandpass shape and position, and we show some examples of measurements made with the ABTF used as a hyperspectral imaging system with a 256 X 256 HgCdTe camera. We conclude with a discussion of potential applications and future work.

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Robert Ryan, Richard G. Madonna, Theodore W. Hilgeman, John D. Hulsmann, William C. Van Nostrand, Lawrence Lesyna, Nils J. Fonneland, J. Michael, Lewis L. Smith, and S. Mielke "Development and testing of a MWIR Fabry-Perot interferometer for hyperspectral imaging", Proc. SPIE 3118, Imaging Spectrometry III, (31 October 1997); https://doi.org/10.1117/12.278938

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KEYWORDS

Mirrors

Fabry–Perot interferometers

Reflectivity

Fabry–Perot interferometry

Imaging systems

Dielectrics

Phase shifts

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