Method of signal processing in a time-division LWIR image polarimetric sensor

Slawomir Gogler; Grzegorz Bieszczad; Jacek Swiderski

doi:10.1364/AO.396675

Applied Optics
Vol. 59,
Issue 24,
pp. 7268-7278
(2020)
•https://doi.org/10.1364/AO.396675

Method of signal processing in a time-division LWIR image polarimetric sensor

Slawomir Gogler, Grzegorz Bieszczad, and Jacek Swiderski

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Slawomir Gogler, Grzegorz Bieszczad, and Jacek Swiderski, "Method of signal processing in a time-division LWIR image polarimetric sensor," Appl. Opt. 59, 7268-7278 (2020)

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Abstract

We report on the method of signal processing in a passive long-wave infrared (LWIR) image polarimetric sensor. The method enables the detection of natural and manmade targets. It includes the error related to the rotation of the polarizing element during an image reading as well as permits the polarimeter operation without a classical phase synchronization loop. In addition, to verify the proposed method, a prototype of a time-division polarimetric system that operates in the 8–12 µm band and is based on an uncooled microbolometric detector array was designed and developed. The entire system enabled us to successfully detect a few types of artificial objects from the distance of several tens of meters. The maximum image refresh rate was 5.45 Hz and could be further increased.

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Architecture	Advantages	Disadvantages
Division of amplitude	– simultaneous registration of all the polarization states	– complicated mechanical adjustment
		– IFOV error
		– high cost
Division of time	– simple construction	– beam-wandering effect
	– straightforward data analysis	– dynamic scene registration error
		– offline or high-latency processing
Division of aperture	– simultaneous registration of all the polarization states	– loss of spatial resolution
		– complicated optical train
Division of the focal plane	– simultaneous registration of all the polarization states	– low component availability
		– IFOV error

Field of View (FOV)	$7, 3^{\circ} \times 5, 5^{\circ}$
Detector dimensions	$640 \times 480$ , 17 µm
Focal length $f^{'}$	85 mm
$f$ -number $F_{#}$	1
Spectral range	8–14 µm
Polarizer clear diameter	50 mm

Architecture	Advantages	Disadvantages
Division of amplitude	– simultaneous registration of all the polarization states	– complicated mechanical adjustment
		– IFOV error
		– high cost
Division of time	– simple construction	– beam-wandering effect
	– straightforward data analysis	– dynamic scene registration error
		– offline or high-latency processing
Division of aperture	– simultaneous registration of all the polarization states	– loss of spatial resolution
		– complicated optical train
Division of the focal plane	– simultaneous registration of all the polarization states	– low component availability
		– IFOV error

Field of View (FOV)	$7, 3^{\circ} \times 5, 5^{\circ}$
Detector dimensions	$640 \times 480$ , 17 µm
Focal length $f^{'}$	85 mm
$f$ -number $F_{#}$	1
Spectral range	8–14 µm
Polarizer clear diameter	50 mm

Abstract

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Figures (14)

Tables (2)

Equations (18)

Applied Optics