Comparing a MWIR and LWIR polarimetric imager for surface swimmer detection

Harchanko, John S.; Pezzaniti, Larry; Chenault, David B.; Eades, Graham

doi:10.1117/12.785010

Cited by 8 publications

(7 citation statements)

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“…Subwavelength gratings integrated on a focal plane arrays (FPAs) for near-infrared (NIR) and mid-infrared (MIR) polarization imaging have been reported in [12][13][14]. The LWIR polarization integration focal plane array (PI-FPA) plays an important role in camouflaged target identifying at room temperatures using polarization information [15][16][17][18][19][20]. However, compared with the MIR detector, the detectivity of the LWIR detector is relatively weak due to the high dark current, and the integration of polarization gratings will lose a lot of optical signals, which will further reduce the signal-to-noise ratio of the device [21].…”

Section: Introductionmentioning

confidence: 99%

A compact polarization-integrated long wavelength infrared focal plane array based on InAs/GaSb superlattice

Zhou

Shi

et al. 2022

Sci. China Inf. Sci.

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Real-time polarization imaging plays a vital role in target detection, recognition, and tracking in complex scenes. However, large optical crosstalk and the integration technology are difficult problems in the development of polarization-integrated infrared detectors. We demonstrate a monolithic long wavelength infrared (LWIR) InAs/GaSb superlattice focal plane array (FPA) integrated with the polarizer. To obtain high performance and real-time polarization imaging device, the parameters of the grating were optimized and the optical crosstalk between adjacent polarization bands was studied. We analysis the light diffraction depending on the distance between the polarizer and photosensitive elements, and the coupling between oblique incident light and device. The fabrication process of the antireflective polarizer, the integration technology of polarizer and the FPA composed of 512×4×3 pixels were explored. Finally, a polarization integrated focal plane array (PI-FPA) was fabricated to detect polarized light with different oscillating directions. The large response extinction ratio of corresponding polarization bands was measured as 50:1, 49:1, and 44:1 of 0 • , 60 • , and 120 • , respectively.

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Section: Introductionmentioning

confidence: 99%

A compact polarization-integrated long wavelength infrared focal plane array based on InAs/GaSb superlattice

Zhou

Shi

et al. 2022

Sci. China Inf. Sci.

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“…Imaging polarimetry has been a subject of extensive research in leading scientific centres [1][2][3][4] in recent two decades. In astronomy, imaging polarimetry has been used since the 1970s.…”

Section: Introductionmentioning

confidence: 99%

“…The remaining Stokes parameters (S2 and S3) were evaluated by computing, respectively, the real and imaginary parts of the cross-correlation function of the measured electric field. Other applications of imaging polarimetry include investigating the properties of soil plants vegetation [10], satellite-based research of Earth's atmosphere [11], examining state of water surfaces [12], medical diagnostics for cancer cell identification [13], biomedicine [14], and detecting military targets, as well as naval search and rescue missions [1,3,15].…”

Section: Introductionmentioning

confidence: 99%

Opto-Electronics Review

Bieszczad,

Gogler,

Świderski

2020

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Thermal-imaging systems respond to infrared radiation that is naturally emitted by objects. Various multispectral and hyperspectral devices are available for measuring radiation in discrete sub-bands and thus enable a detection of differences in a spectral emissivity or transmission. For example, such devices can be used to detect hazardous gases. However, their operation principle is based on the fact that radiation is considered a scalar property. Consequently, all the radiation vector properties, such as polarization, are neglected. Analysing radiation in terms of the polarization state and the spatial distribution of thereof across a scene can provide additional information regarding the imaged objects. Various methods can be used to extract polarimetric information from an observed scene. We briefly review architectures of polarimetric imagers used in different wavebands. First, the state-of-the-art polarimeters are presented, and, then, a classification of polarimetricmeasurement devices is described in detail. Additionally, the data processing in Stokes polarimeters is given. Emphasis is laid on the methods for obtaining the Stokes parameters. Some predictions in terms of LWIR polarimeters are presented in the conclusion.

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“…Across almost entire electromagnetic spectrum imaging polarimetry has found numerous applications including investigation of plant vegetation, satellite research of Earth's atmosphere [4], examining oceans' salinity [6], medical diagnostics for cancer cell identification [8] biomedicine [9], military target detection and search and rescue operations [1,3,9].…”

Section: Introductionmentioning

confidence: 99%

Stokes parameters determination in LWIR spectrum with imaging IR camera setup

Bieszczad¹,

Łoniewski²,

Gogler³

2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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Most frequently used thermal imaging devices respond only to one physical quantity, that is radiance. In more sophisticated devices, the waveband of concern is split into sub-bands and energy flux is quantified per sub-band. These are so-called multispectral or hyperspectral cameras and are used for detection and discrimination of chemical compounds, very frequently hazardous gases. Even in these devices however only one physical quantity is analysedspectral radiance. It has been shown that the analysis of radiation against the state of polarization and its spatial distribution across the scene can deliver additional information on observed objects. In the article a measurement stand for determination of polarization state is described and the polarization image properties for chosen objects are described.

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Comparing a MWIR and LWIR polarimetric imager for surface swimmer detection

Cited by 8 publications

References 0 publications

A compact polarization-integrated long wavelength infrared focal plane array based on InAs/GaSb superlattice

A compact polarization-integrated long wavelength infrared focal plane array based on InAs/GaSb superlattice

Opto-Electronics Review

Stokes parameters determination in LWIR spectrum with imaging IR camera setup

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