&lt;title&gt;Polarization-sensitive thermal imaging&lt;/title&gt;

Chun, Cornell S. L.; Fleming, David L.; Torok, E. J.

doi:10.1117/12.181025

Cited by 47 publications

(24 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The standard deviation values show that the azimuth angle can be determined at every point on the target to an uncertainty as small as 10°. With an optimized sensor the uncertainty can be made less than 30 10 Automated microscanning. In the automated microscanning method we used two tilted plates each driven by a stepping motor.…”

Section: Methods Of Imaging Intensity and Polarization Fn A Sequence Omentioning

confidence: 99%

<title>Polarization-sensitive thermal imaging sensors for target discrimination</title>

Chun¹,

Fleming²,

Harvey³

et al. 1998

Targets and Backgrounds: Characterization and Representation IV

Self Cite

View full text Add to dashboard Cite

Physics Innovations Inc. has developed polarization-sensitive imaging sensors with high-spatial resolution. In this paper we describe methods where video frames are captured and processed into images of the target's temperature distribution and the target's three dimensional shape and orientation. We demonstrate that the two angles describing surface orientation can be determined for every point on a target. For all targets in the field of view, their geometric shapes and temperatures can be determined simultaneously. With high-speed signal processing, high-resolution polarimetric data can be captured and displayed in real time and at video frequency.Conventional methods for passively detecting and identifying targets often rely on sensing the intensity of infrared light reflected or emitted by objects. A fundamental problem associated with sensing the intensity is that intensity gives one parameter while the orientation of surface elements has two degrees of freedom. Physics Innovations Inc. is developing a thermal imaging technique for determining surface orientation where, in each image pixel, two parameters are sensed simultaneously. The two parameters, percent of polarization P and angle of the plane of polarization are directly related to the two angles of surface orientation. Although thermal infrared intensity images of terrestrial scenes have low contrast, images of P and often have high contrast for different surface orientations. This high contrast should facilitate image segmentation and classification of objects.Polarization also gives useful information about the surface properties of the object. Man-made objects have unnaturally smooth surfaces, leading to radiation with greater polarization. Natural backgrounds such as grass, trees, dirt, and sand emit and reflect radiation that is less polarized.Researchers have recognized the potential usefulness of imaging polarization data for target detection and recognition. However, wide-spread use of polarization data in the infrared has not occurred, probably because polarization-sensitive imaging methods have been slow, bulky, and subject to object misregistration. Physics Innovations Inc. is developing polarization-sensitive imaging sensors which are compact, portable, and, for some applications, can be retrofitted into existing optical imaging systems. This paper describes the operation of polarization-sensitive thermal imaging sensors which are capable of simultaneously capturing intensity and polarization data without misregistration and in real time. The results show that three-dimensional information, in addition to temperature distribution, can be captured and displayed in real time and at near video frequency. These results also show that polarization data provides useful contrast, enough to distinguish man-made objects from backgrounds and to distinguish different surface orientations.

show abstract

Section: Methods Of Imaging Intensity and Polarization Fn A Sequence Omentioning

confidence: 99%

<title>Polarization-sensitive thermal imaging sensors for target discrimination</title>

Chun¹,

Fleming²,

Harvey³

et al. 1998

Targets and Backgrounds: Characterization and Representation IV

Self Cite

View full text Add to dashboard Cite

show abstract

“…[13][14][15] This type of sensors integrate polarization filters composed of metallic nanowires with the pixel of the array detector. Fig.7 and Fig.8 are the diagram and a real polarization analyzing CMOS imaging sensor [15] . The prototype of DoFP polarimeter ignores spectral information and is only capable of detecting the line polarized intensity information.…”

Section: Division Of Focal Plane Array (Dofp) Polarimetermentioning

confidence: 99%

Progress in development of imaging polarimeter for Stokes parameter measurement

et al. 2014

View full text Add to dashboard Cite

Imaging polarimeter is one of the primary tools of state of polarizatio analysis, and it enhances the information available in variety of applications. The foundations of polarimeter are discussed. Two classes of typical imaging polarimeters are reviewed, including division of time polarimeters and simultaneous measurement polarimeters. Both of the classes are subdivided in to several kinds of polarimeters, characteristics of them are discussed. Our current work on imaging polarimeter is revealed at last.

show abstract

“…The concept was first proposed by Chun et al in 1994 [224]. With advances in microlithography, it is now possible to fabricate micro-polarizers with sub-wavelength periodic structures.…”

Section: Snapshot Multidimensional Imaging Implementations and Appmentioning

confidence: 99%

“…Snapshot imaging polarimetry can be realized by directly placing an array of such polarization filters just in front of an FPA. Due to the difficulty of fabricating sub-wavelength structures, previous studies were confined to the infrared region [223, 224]. Recently, this technology has been extended to the visible light range, owing to the rapid progress in nanofabrication techniques.…”

Section: Snapshot Multidimensional Imaging Implementations and Appmentioning

confidence: 99%

A review of snapshot multidimensional optical imaging: Measuring photon tags in parallel

2016

View full text Add to dashboard Cite

Multidimensional optical imaging has seen remarkable growth in the past decade. Rather than measuring only the two-dimensional spatial distribution of light, as in conventional photography, multidimensional optical imaging captures light in up to nine dimensions, providing unprecedented information about incident photons’ spatial coordinates, emittance angles, wavelength, time, and polarization. Multidimensional optical imaging can be accomplished either by scanning or parallel acquisition. Compared with scanning-based imagers, parallel acquisition—also dubbed snapshot imaging—has a prominent advantage in maximizing optical throughput, particularly when measuring a datacube of high dimensions. Here, we first categorize snapshot multidimensional imagers based on their acquisition and image reconstruction strategies, then highlight the snapshot advantage in the context of optical throughput, and finally we discuss their state-of-the-art implementations and applications.

show abstract

<title>Polarization-sensitive thermal imaging</title>

Cited by 47 publications

References 0 publications

<title>Polarization-sensitive thermal imaging sensors for target discrimination</title>

<title>Polarization-sensitive thermal imaging sensors for target discrimination</title>

Progress in development of imaging polarimeter for Stokes parameter measurement

A review of snapshot multidimensional optical imaging: Measuring photon tags in parallel

Contact Info

Product

Resources

About