Comparison of reflective band (Vis, NIR, SWIR, eSWIR) performance in daytime reduced illumination conditions

Wiley, Lindsey; Follansbee, Joshua; Burrell, Derek; Grimming, Robert; Pimpinella, Rich; Voss, Jeffrey M.; Furxhi, Orges; Driggers, Ronald G.

doi:10.1117/12.2663402

Cited by 3 publications

(2 citation statements)

References 14 publications

(16 reference statements)

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“…This is due to limitation of Rayleigh scattering, which magnitude is inversely proportional to the fourth power of the wavelength. This makes eSWIR with its extended cut-off wavelength even more suitable for such application fields [2]. AIM has already shown the capability of active imaging with a laser designator with 1.5 µm [8].…”

Section: Advantages Of Eswir Imagingmentioning

confidence: 99%

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Improved MCT eSWIR modules for various demands of imaging applications

Wiegleb,

Breiter,

Lutz

et al. 2023

Electro-Optical and Infrared Systems: Technology and Applications XX

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The Short Wave Infrared (SWIR) market for defense, aerospace and industry applications is rapidly growing. A wide range of applications is available: From night vision to plastic sorting up to hyperspectral imaging. The classical SWIR detectors, which are based on InGaAs technology, have a cut-off wavelength typically around 1.7 µm. The extended SWIR (eSWIR) technology, with a spectral range up to 2.5 µm however offers significant advantages over traditional SWIR detectors. These are e.g. full exploitation of the nightglow spectrum, enhanced imaging under low light condition or 'out of band' operation with laser illuminators with a wavelength >2 µm. In addition, eSWIR technology includes reflective and thermal imaging, which allows detecting thermal target radiation in complete darkness. AIM presents its modules with different array formats and pixel pitches in the eSWIR spectral range from 0.8 µm up to 2.5 µm. Additionally we show that the cut-on wavelength can be lowered down to ~0.4 µm to extend the spectrum to the visible range by removing the detector substrate. A low size, weight and power (SWaP) eSWIR 640x512 10 µm pitch module has been developed and produced by AIM. It is best suited for handheld imaging or hyperspectral imaging applications with e.g. integration in UAVs. Key enabler for low SWaP however is higher operating temperature detector technology. Hence, we present the last improvements on dark current density and electro-optical performance of our eSWIR MCT HOT detector technology.

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Section: Advantages Of Eswir Imagingmentioning

confidence: 99%

“…At moonless nights, the eSWIR sensor captures the entire nightglow spectrum, yielding supplementary information. Another noteworthy benefit of SWIR imagers is their enhanced ability to penetrate fog, dust, or haze compared to traditional visible sensors, thanks to reduced Rayleigh scattering [2].…”

Section: Introductionmentioning

confidence: 99%

Improved MCT eSWIR modules for various demands of imaging applications

Wiegleb,

Breiter,

Lutz

et al. 2023

Electro-Optical and Infrared Systems: Technology and Applications XX

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A comparison of reflected and emitted radiometric signal levels in SWIR, eSWIR, MWIR, and superband (SWIR through MWIR) optical systems

Somerville,

Leslie,

Jordan

et al. 2024

Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXXV

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With the improvement of infrared detector technology over the last several decades, traditional design trades regarding the use of different wavebands in optical systems are becoming less and less applicable. New detector technology is allowing for extended and even bridged wavebands, where previous detectors were limited to only a single waveband. These bridged waveband cameras, or superband cameras, contain detectors with response over large spectral spans, allowing them to take advantage of the unique properties of multiple wavebands. This type of system is especially of interest when the superband contains both the short-wave infrared (SWIR) wavebandwhere most of the signal comes from reflected lightand midwave infrared (MWIR) wavebandwhere most of the signal comes from emitted light. Such a superband system allows the combination of reflected and emitted light on a single detector, opening new system level optical design trades across many fields and disciplines. Presented is a comparison of reflected and emitted radiometric signal levels for four filtered wavebands using a 1.5 μm to 5.4 μm superband imaging system: (1) with a 1.9 μm SWIR shortpass filter, (2) with a 2 μm to 2.5 μm extended SWIR (eSWIR) bandpass filter, (3) with a 3 μm MWIR longpass filter, and (4) with no filter (i.e., full superband response). The comparison in each of the four wavebands is repeated under four solar illumination conditions: full daylight, clouds, dusk, and night.

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The effects of focal plane parameters on eSWIR imaging system performance

Hendrick,

Wiley,

Velicu

et al. 2024

Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXXV

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In the last half-decade, the extended shortwave infrared (eSWIR) atmospheric band has become a focus of investigation for its potential to provide better object discrimination at range than the visible, as well as the near, shortwave, midwave, and longwave infrared bands, particularly in degraded visual environments such as smoke, dust, and smog. However, any detection band is only as useful as the best available detector, and thus an investigation into the design of detectors for use in the eSWIR band is necessary before standards are established and applications put into practice. This study examines the relationship between detector parameters and targeting performance in the eSWIR band for both passive and active detection. The effects of pixel pitch, dark current, read noise, frame rate, quantum efficiency, and well depth are examined and ranked in importance to an eSWIR system's performance.

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Comparison of reflective band (Vis, NIR, SWIR, eSWIR) performance in daytime reduced illumination conditions

Cited by 3 publications

References 14 publications

Improved MCT eSWIR modules for various demands of imaging applications

Improved MCT eSWIR modules for various demands of imaging applications

A comparison of reflected and emitted radiometric signal levels in SWIR, eSWIR, MWIR, and superband (SWIR through MWIR) optical systems

The effects of focal plane parameters on eSWIR imaging system performance

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