Comparison of HgCdTe and quantum-well infrared photodetector dual-band focal plane arrays

Goldberg, Arnold C.; Kennerly, Stephen W.; Little, John W.; Shafer, T.A.; Mears, C.L.; Schaake, H. F.; Winn, Michael L.; Taylor, Marcus; Uppal, Parvez N.

doi:10.1117/1.1526106

Cited by 28 publications

(10 citation statements)

References 11 publications

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“…By analyzing both spectrums simultaneously, we can increase our ability to detect targets in clutter and distinguish between targets and decoys. 1 Nearly every application of dual-band imaging spectrometry has the same goal: to provide the spatial coregistered spectral content of the scene over two separate spectral bands.…”

Section: Background 1imaging Spectrometermentioning

confidence: 99%

Snapshot dual-band visible hyperspectral imaging spectrometer

Hartke

Dereniak

2007

Opt. Eng

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We describe a proof of concept for a snapshot dual-band visible hyperspectral imaging spectrometer. A commercially available digital camera was integrated into a computed tomographic imaging spectrometer to provide a means for this proof of concept. Two spatially coregistered data cubes covering the blue ͑400 to 500 nm͒ and red ͑600 to 700 nm͒ spectral regions were reconstructed and the results analyzed. We found that the system accurately reconstructs the spectral content of the scene and that the two data cubes are automatically spatially coregistered by virtue of the system design.

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Section: Background 1imaging Spectrometermentioning

confidence: 99%

Snapshot dual-band visible hyperspectral imaging spectrometer

Hartke

Dereniak

2007

Opt. Eng

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“…As a result of the mature growth and processing techniques, QWIP detectors have high operability with uniform pixel-to-pixel response and lower cost. 11 The drawbacks of QWIP detectors are lower quantum efficiency and higher dark currents requiring cooling to 65 K or lower. QWIPs also cannot absorb normally incident light because of selection rules, so they need a grating to couple the light into the detector.…”

Section: Hgcdte Detectorsmentioning

confidence: 99%

Non-scanning dual infrared band hyperspectral imaging spectrometer design

2006

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Recent advances in dual band infrared focal plane technology now enable the design and testing of a dual infrared band snapshot imaging spectrometer, the first-ever of its kind. A review of proof of concept results from a dual-visible-band Computed Tomographic Imaging Spectrometer (CTIS) system is presented. The dual-visible system demonstrates that it is possible to reconstruct two spatially co-registered hyperspectral data cubes covering different spectral bands. Based on the visible band CTIS proof of concept, a similar infrared system is now proposed. Critical to the CTIS system is the design of the Computer Generated Holographic (CGH) disperser. Several different (CGH) designs are considered. A first order optical design for the dual infrared band CTIS is presented.Keywords: Dual band, imaging spectrometer, computed tomographic imaging spectrometer BACKGROUND:The recent advances in infrared focal plane technology and the increase in computing power have enabled the creation of a snapshot dual infrared band imaging spectrometer. Infrared focal planes are now being designed and built that consist of detectors that are sensitive to two different spectral regions stacked on top of each other. The advances in computing power have enabled the development of the Computed Tomographic Imaging Spectrometer (CTIS). The CTIS system uses a Computer Generated Holographic (CGH) dispersive optical element to disperse the spectral content of the scene.The goal of all imaging spectrometers is to obtain the spatially registered spectral content of the scene of interest. The product of an imaging spectrometer is a three dimensional data cube. Two of the dimensions of the data cube are the x and y spatial coordinates while the third coordinate is the wavelength of the light intensity in the scene. Conventional imaging spectrometers scan the scene either spatially like a whiskbroom or pushbroom system or spectrally like a filter wheel system. For dynamic scenes the scanning imaging spectrometers may not be able to complete the scan, whether spatially or spectrally, before the scene significantly changes. The CTIS system on the other hand obtains all the information required to reconstruct a data cube in a single snapshot. The spectral content of the scene is dispersed in several radial directions. Each diffracted order is a two dimensional projection of the data cube. The data cube is reconstructed by using tomographic techniques similar to those used in medical computed tomography. Within the data cube we define the discrete three-dimensional differential volume element as a voxel.There are times when we may need to measure the hyperspectral content of the scene over two separate bands. It is possible to split the incoming light in two and reconstruct the two data cubes measured by separated HSI channels independently. The challenge then becomes spatial co-registration of the two cubes. If the focal plane consists of detectors sensitive to the two bands in an interwoven pattern (similar to the commercial approach for three waveb...

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“…The top layer is for 3-5.4 m radiation and the bottom layer is for 8-10.5 m radiation. 3 The FPA was placed in a closed cycle Sterling cooler dewar with a cold filter and a cold stop and a specially coated Ge window is used in the dewar. The cold stop defined the field of view of the FPA.…”

Section: Technical Approachmentioning

confidence: 99%

A simultaneous dual-band infrared hyperspectral imager for standoff detection

Gupta

Smith

2005

Chemical and Biological Standoff Detection III

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A novel dual-band hyperspectral imager has been developed to collect 128-band hyperspectral image cubes simultaneously in both 4-5.25 m (mid wave IR, MWIR) and 8-10.5 m (long wave IR, LWIR) bands for both target detection and standoff detection of chemical and biological agents. The imager uses a specially designed diffractive optics Ge lens with a dual-band 320 240 HgCdTe infrared (IR) focal plane array (FPA) cooled with a closed cycle Sterling-cooler. The diffractive optics lens acts both as a focusing as well as a dispersive device. The imager simultaneously collects a single-color full scene image with a narrow band in the LWIR region (e.g., at 8 m) using the first order diffraction and corresponding single-color image in the MWIR region (e.g., at 4 m) using the second order diffraction. Images at different wavelengths are obtained by moving the lens along its optical axis to focus the corresponding wavelengths. Contributions of out of focus wavelengths are removed in post processing. In this paper we will briefly discuss the imager and present data and results from a recent field test.

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Comparison of HgCdTe and quantum-well infrared photodetector dual-band focal plane arrays

Cited by 28 publications

References 11 publications

Snapshot dual-band visible hyperspectral imaging spectrometer

Snapshot dual-band visible hyperspectral imaging spectrometer

Non-scanning dual infrared band hyperspectral imaging spectrometer design

A simultaneous dual-band infrared hyperspectral imager for standoff detection

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