Thermal Imaging Systems' Relative Performance:  3-5 Micrometers vs 8-12 Micrometers.

Tuer, Thomas W.

doi:10.21236/ada037248

Cited by 4 publications

(2 citation statements)

References 19 publications

(37 reference statements)

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“…2 They concluded that for the detection of small temperature differences at ambient temperatures the longwave band in most cases was expected to be superior to the midwave band, while commenting that under certain conditions it was possible the latter could give equal to better performance compared to the former. Tuer, 3 in a detailed analysis of the relative performance of midwave and longwave thermal-imaging systems operating in typical outdoor terrestrial situations showed that the midwave band gives superior performance compared to the longwave band in most situations. Performance however in the midwave band was found to deteriorate more rapidly compared to performance in the longwave band for cooler targets.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the relative merits of the 3-5 μm and the 8-12 μm spectral bands using detected thermal contrast

Stewart

2015

SPIE Proceedings

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The two most important atmospheric transmission bands in the infrared occur at 3-5 µm and 8-12 µm respectively. For a given infrared detector a common question that continues to be asked is, of the two spectral bands, which, if any, gives the better performance? While seemly an innocent enough question, the literature attests it has not been without controversy. Conflicting and often contradictory results have been given that tend to reflect the predilections of the proponent rather than any sort of measured consideration based on technical factors likely to affect performance. In this study an analysis designed to assess the relative merits of infrared detectors operating in the 3-5 µm and 8-12 µm spectral bands based on the recently defined figure of merit known as the detected thermal contrast is undertaken. The detected thermal contrast attempts to describe the overall performance of the sequence of events from the initial emission of thermal radiation at the surface of a target to the final measurable output signal seen in the detecting instrument. Under ideal limiting conditions typical of those found for many industrial and scientific applications, by considering targets whose spectral emissivities vary as a function of both wavelength and temperature, exact expressions based on the recently introduced polylogarithmic formulation of the problem are developed for both thermal and quantum detectors. It is found the 3-5 µm waveband for either detector type gives better performance while differences between the two types of detectors is not as significant as one might initially expect. The work not only extends upon a number of approximate schemes that have been proposed and developed in the past where target emissivities as a function of the temperature have been used, it also challenges a number of previously reported results.

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Section: Introductionmentioning

confidence: 99%

Analysis of the relative merits of the 3-5 μm and the 8-12 μm spectral bands using detected thermal contrast

Stewart

2015

SPIE Proceedings

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“…This question is important to the Army for the simulation ofthennal target signatures and the effects of signature suppression on acquisition ranges of infrared sensors. Many studies [1][2][3][4] have been done to access the relative performance of3-5 micron and 8-12 micron systems. Previous studies often produced conflicting results.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the performance of 3- to 5- and 8- to 12-µm infrared cameras

et al. 1994

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An image based comparison ofmodeled infrared cameras in the medium-wave (MW) and longwave (LW) bands is done using the TARDEC Thermal Image Model (M) and LOWTRAN7. A state-of-the-art staring focal plane array (FPA), a common module scanning FLIR, and a scanning dual-band sensor are modeled. The simulations using TFIM demonstrate the imaging perfonnance ofthe cameras as well as the degradation caused by the atmosphere in the two bands. Atmospheric degradation to the image is simulated in rain and fog in northern hemisphere environments.

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Infrared Imaging

Meitzler¹,

Bednarz²,

Sohn³

et al. 2017

Wiley Encyclopedia of Electrical and Electronics Engineering

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In the following article, the science and technology behind infrared imaging is described with many examples. The history of the discovery of the infrared part of the electromagnetic spectrum is outlined along with a physical explanation of infrared radiation and some of the applications of infrared technology in industry. Detailed descriptions of typical infrared imaging systems along with infrared imaging system modeling is provided. The next section includes a lengthy description of modern image processing, in other words, how a computer can be used to improve and analyze the images produced from infrared imaging systems. Several clutter and infrared image quality metrics, such as texture and entropy, are examined and their relevance to ground vehicle target acquisition is described. Texture and entropy metrics are computed for several example images and then compared to an experimental probability of detection in the Visual Perception Lab. Comparison of computational metrics to experimental human perception metrics is a very important type of visual image assessment. The use of human perception experiments as a qualifier and validator of infrared imagery quality along with experimental protocols are described. Image processing modern approaches such as relative clutter, probability of edge, image fusion, and fuzzy logic image fusion are explained in detail. Finally, there are examples of the use of infrared imaging for important problems in industry and to the US Army, such as using infrared imaging to detect ice on the external surface of the NASA Space Transport System and how infrared imaging can be used for the purpose of burred mine detection and homeland security applications.

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Thermal Imaging Systems' Relative Performance: 3-5 Micrometers vs 8-12 Micrometers.

Cited by 4 publications

References 19 publications

Analysis of the relative merits of the 3-5 μm and the 8-12 μm spectral bands using detected thermal contrast

Analysis of the relative merits of the 3-5 μm and the 8-12 μm spectral bands using detected thermal contrast

Comparison of the performance of 3- to 5- and 8- to 12-µm infrared cameras

Infrared Imaging

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