&lt;title&gt;High-fidelity phenomenology modeling of infrared emissions from missile and aircraft exhaust plumes&lt;/title&gt;

Crow, Dennis R.; Coker, Charles F.

doi:10.1117/12.241101

Cited by 6 publications

(4 citation statements)

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“…Specific features of CTI which make it a viable alternative to traditional approaches include: (1) the components and construction of CTI make it inexpensive and compatible with existing remote sensing systems designed for imaging, (2) in addition to the 3-D HSI data, the projections over a range of 0° -180° allow for a complete 2-D reconstruction of the wideband (panchromatic) image, and (3) each CTI projection (frame) represents a 2-D spectrograph of all targets in the field of view simultaneously. These features combined with very fast data collection make the CTI attractive to characterizing events occurring in a battlespace such as artillery fire, detonations and explosions and fast burning missiles having spectral and spatial phenomenology occurring on the order of 10 Hz [5][6][7][8][9][10][11][12][13][14][15]. The CTI concept using a two component, direct vision prism was introduced in 1995 by Mooney et al [16][17].…”

Section: Introductionmentioning

confidence: 99%

Chromotomosynthesis for high speed hyperspectral imagery

Bostick¹,

Perram²

2012

SPIE Proceedings

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A rotating direct vision prism, chromotomosynthetic imaging (CTI) system operating in the visible creates hyperspectral imagery by collecting a set of 2D images with each spectrally projected at a different rotation angle of the prism. Mathematical reconstruction techniques that have been well tested in the field of medical physics are used to reconstruct the data to produce the 3D hyperspectral image. The instrument operates with a 100 mm focusing lens in the spectral range of 400-900 nm with a field of view of 71.6 mrad and angular resolution of 0.8-1.6 μrad. The spectral resolution is 0.6 nm at the shortest wavelengths, degrading to over 10 nm at the longest wavelengths. Measurements using a pointlike target show that performance is limited by chromatic aberration. The accuracy and utility of the instrument is assessed by comparing the CTI results to spatial data collected by a wideband image and hyperspectral data collected using a liquid crystal tunable filter (LCTF). The wide-band spatial content of the scene reconstructed from the CTI data is of same or better quality as a single frame collected by the undispersed imaging system with projections taken at every 1°. Performance is dependent on the number of projections used, with projections at 5° producing adequate results in terms of target characterization. The data collected by the CTI system can provide spatial information of equal quality as a comparable imaging system, provide high-frame rate slitless 1-D spectra, and generate 3-D hyperspectral imagery which can be exploited to provide the same results as a traditional multi-band spectral imaging system. While this prototype does not operate at high speeds, components exist which will allow for CTI systems to generate hyperspectral video imagery at rates greater than 100 Hz. The instrument has considerable potential for characterizing bomb detonations, muzzle flashes, and other battlefield combustion events.

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Section: Introductionmentioning

confidence: 99%

Chromotomosynthesis for high speed hyperspectral imagery

Bostick¹,

Perram²

2012

SPIE Proceedings

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“…However, the lifetime of these events is on the order of 1 s or less, with spatial and spectral properties changing at rates of >10 Hz [1][2][3], making it difficult for traditional hyperspectral imaging (HSI) to exploit the information. A chromotomosynthetic imaging (CTI) system, using a rotating prism design, has the potential to produce hyperspectral images at rates approaching 100 Hz.…”

Section: Introductionmentioning

confidence: 99%

Instrumental error in chromotomosynthetic hyperspectral imaging

Bostick

Perram

2012

Appl. Opt.

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Chromotomosynthetic imaging (CTI) is a method of convolving spatial and spectral information that can be reconstructed into a hyperspectral image cube using the same transforms employed in medical tomosynthesis. A direct vision prism instrument operating in the visible (400-725 nm) with 0.6 mrad instantaneous field of view (IFOV) and 0.6-10 nm spectral resolution has been constructed and characterized. Reconstruction of hyperspectral data cubes requires an estimation of the instrument component properties that define the forward transform. We analyze the systematic instrumental error in collected projection data resulting from prism spectral dispersion, prism alignment, detector array position, and prism rotation angle. The shifting and broadening of both the spectral lineshape function and the spatial point spread function in the reconstructed hyperspectral imagery is compared with experimental results for monochromatic point sources. The shorter wavelength (λ<500 nm) region where the prism has the highest spectral dispersion suffers mostly from degradation of spectral resolution in the presence of systematic error, while longer wavelengths (λ>600 nm) suffer mostly from a shift of the spectral peaks. The quality of the reconstructed hyperspectral imagery is most sensitive to the misalignment of the prism rotation mount. With less than 1° total angular error in the two axes of freedom, spectral resolution was degraded by as much as a factor of 2 in the blue spectral region. For larger errors than this, spectral peaks begin to split into bimodal distributions, and spatial point response functions are reconstructed in rings with radii proportional to wavelength and spatial resolution.

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“…The technology has been referred to chromatography in the previous literature; we have decided to use the term chromotomosynthesis as the projection geometry and reconstruction mathematics more closely resemble those used in medical tomosynthesis 6,14-18 than those used in traditional tomography. [23][24][25][26][27] An exact three-dimensional (3-D) reconstruction described by the Radon transform cannot be achieved in CTI as the direction of the spectral dispersion of the prism is not perpendicular to the rotation axis of the prism. 21,22 Each projection (frame) of data taken by the CTI represents a two-dimensional (2-D) spectrograph, which can be exploited to analyze high frequency changes in spectral content.…”

Section: Introductionmentioning

confidence: 99%

Classification of visible point sources using hyperspectral chromotomosynthetic imagery

Bostick¹,

Perram²

2012

J. Appl. Remote Sens

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A hyperspectral chromotomosynthetic imaging (CTI) system is used to detect and classify a collection of 21 scattered, spectrally diverse point-like sources. The instrument operates in the visible to near IR (400 to 800 nm) and has the potential to collect spectral imagery at great than 10 Hz. A two-dimensional wideband spatial image of the target scene is used to detect and spatially characterize the targets leading to optimization of the three-dimensional (3-D) spatial/spectral reconstruction of the hyperspectral image cube. The instrument is assessed by directly comparing results to spatial data collected by a wideband image and hyperspectral data collected using a liquid crystal tunable filter (LCTF). Target classification using k-means clustering of observed spectra yielded 5 to 6 target classes for each methodology, indicating information obtained using CTI was similar to that collected by the LCTF. The wide-band spatial content of the scene reconstructed from the CTI data is of same or better quality in terms of background noise and target intensities as a single frame collected by the undispersed imaging system with projections taken at every 1 deg. Performance is dependent on the number of projections used, with projections at 5 deg producing adequate results in terms of target characterization. The CTI has 2 to 4 times the spectral resolution of the LCTF. The data collected by the CTI system can simultaneously provide spatial information of equal quality as a the bandpass imaging system, provide high-frame rate slitless one-dimensional spectra, and generate 3-D hyperspectral imagery which can be exploited to provide the same results as a traditional multiband spectral imaging system.

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<title>High-fidelity phenomenology modeling of infrared emissions from missile and aircraft exhaust plumes</title>

Cited by 6 publications

References 0 publications

Chromotomosynthesis for high speed hyperspectral imagery

Chromotomosynthesis for high speed hyperspectral imagery

Instrumental error in chromotomosynthetic hyperspectral imaging

Classification of visible point sources using hyperspectral chromotomosynthetic imagery

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