Laid and flush-buried mine detection using an 8- to 12-μm polarimetric imager

Larive, M.; Collot, Laurent; Breugnot, S.; Botma, H.; Roos, Pier

doi:10.1117/12.324183

Cited by 7 publications

(7 citation statements)

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“…The first polarization imaging systems have been division of time polarimeters [1][2][3][4][5][6][7][8][9][10] with mechanical rotation of polarizer and waveplate between frames. These systems are usually quite slow and very sensitive to motion of the scene between frames.…”

Section: Division Of Time Polarimetersmentioning

confidence: 99%

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High-speed polarization imaging camera based on electrically driven PLZT waveplate and split focal plane

et al. 2008

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We present a Stokes polarization camera prototype based on an electro-optic ceramic (PLZT) as the key polarization component. Two pairs of electrodes are used to control the applied electric field and so the retardance and orientation of the induced waveplate. The active area of the PLZT element is 120x120µm. To increase the effective active area, a 2D array PLZT is used. Imaging through this 2D array with reduced fill factor is achieved by splitting the focal plane. The focal plane is split by a microlenses array and interacts with each element of the ceramic array. A modified focal plane is reconstructed by another microlenses array. Digital image processing is used to recover the prime focal plane information. The technology used in this device (ceramic element, 2D array, imaging with split focal plane) as well as characterization of the ceramic element and preliminary results will be presented.

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Section: Division Of Time Polarimetersmentioning

confidence: 99%

“…A lot of different technological approaches of imaging polarimeters have been studied [1][2][3][4][5][6][7][8][9][10][11][12][13] . We present a new approach using a 2D array of polarization elements and a split focal plane.…”

Section: Introductionmentioning

confidence: 99%

High-speed polarization imaging camera based on electrically driven PLZT waveplate and split focal plane

et al. 2008

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“…It increases the amount of information of the detected scene. Various technological approaches of imaging polarimeters have been studied [1][2][3][4][5][6][7][8] . We have designed a simultaneous imaging polarimetry with double separate Wollaston Prism(SIP-DSWP) 9-10 , which is a combination of division-of-amplitude and division-of-aperture.…”

Section: Introductionmentioning

confidence: 99%

Polarization information processing and software system design for simultaneously imaging polarimetry

et al. 2015

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Simultaneous imaging polarimetry can realize real-time polarization imaging of the dynamic scene, which has wide application prospect. This paper first briefly illustrates the design of the double separate Wollaston Prism simultaneous imaging polarimetry, and then emphases are put on the polarization information processing methods and software system design for the designed polarimetry. Polarization information processing methods consist of adaptive image segmentation, high-accuracy image registration, instrument matrix calibration. Morphological image processing was used for image segmentation by taking dilation of an image; The accuracy of image registration can reach 0.1 pixel based on the spatial and frequency domain cross-correlation; Instrument matrix calibration adopted four-point calibration method. The software system was implemented under Windows environment based on C++ programming language, which realized synchronous polarization images acquisition and preservation, image processing and polarization information extraction and display. Polarization data obtained with the designed polarimetry shows that: the polarization information processing methods and its software system effectively performs live realize polarization measurement of the four Stokes parameters of a scene. The polarization information processing methods effectively improved the polarization detection accuracy.

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“…Polarizationsensitive infrared cameras have been investigated as a new technology for land mine detection [14,15]. QD-based structures can also be used to develop polarization sensitive detectors [16].…”

Section: Dual-band Polarization Sensitive T-qdipsmentioning

confidence: 99%

Wavelength and polarization selective multi-band tunnelling quantum dot detectors

Perera

Ariyawansa

Apalkov

et al. 2007

Opto-Electronics Review

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The reduction of the dark current without reducing the photocurrent is a considerable challenge in developing far-infrared (FIR)/terahertz detectors. Since quantum dot (QD) based detectors inherently show low dark current, a QD-based structure is an appropriate choice for terahertz detectors. The work reported here discusses multi-band tunnelling quantum dot infrared photo detector (T-QDIP) structures designed for high temperature operation covering the range from mid-to far-infrared. These structures grown by molecular beam epitaxy consist of a QD (InGaAs or InAlAs) placed in a well (GaAs/AlGaAs) with a double-barrier system (AlGaAs/InGaAs/AlGaAs) adjacent to it. The photocurrent, which can be selectively collected by resonant tunnelling, is generated by a transition of carriers from the ground state in the QD to a state in the well coupled with a state in the double-barrier system. The double-barrier system blocks the majority of carriers contributing to the dark current. Several important properties of T-QDIP detectors such as the multi-colour (multi-band) nature of the photoresponse, the selectivity of the operating wavelength by the applied bias, and the polarization sensitivity of the response peaks, are also discussed.

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Laid and flush-buried mine detection using an 8- to 12-μm polarimetric imager

Cited by 7 publications

References 0 publications

High-speed polarization imaging camera based on electrically driven PLZT waveplate and split focal plane

High-speed polarization imaging camera based on electrically driven PLZT waveplate and split focal plane

Polarization information processing and software system design for simultaneously imaging polarimetry

Wavelength and polarization selective multi-band tunnelling quantum dot detectors

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