&lt;title&gt;Temperature dependence of spatial noise in InSb focal plane arrays&lt;/title&gt;

Shkedy, Lior; Amir, O.; Calahora, Zipora; Oiknine‐Schlesinger, J.; Szafranek, I.

doi:10.1117/12.391762

Cited by 14 publications

(9 citation statements)

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“…The central reason is that measurement noise is not always uncorrelated. A variety of causes exist, however, an important source in the context of staring arrays is fixed pattern noise (FPN) relating to variations in the offset and gain characteristics of detector elements across the array [17]. Variations in the latter are the most relevant since these are indistinguishable from variations in the thermoelastic response in the scene (i.e.…”

Section: Sensitivity Enhancementmentioning

confidence: 99%

Thermoelastic stress analysis with a compact low-cost microbolometer system

Rajic

Rowlands

2013

Quantitative InfraRed Thermography Journal

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This article describes the development and validation of a novel thermoelastic stress analysis (TSA) system based on a low-cost microbolometer device. The use of a microbolometer for a highly synchronous and delicate temperature measurement breaks a longstanding and exclusive reliance on high performance, cooled photon detectors for thermoelastic applications. It is shown that despite markedly inferior noise equivalent temperature detectivity and dynamic response specifications, microbolometers are capable of achieving comparable levels of stress measurement performance. The practical implications for experimental stress analysis are significant. Microbolometers are relatively low in capital cost, small in size, have good tolerance to shock and vibration and consume less power than their photon counterparts, attributes that confer enormous practical advantages. It is argued that the emergence of TSA systems that are more affordable and better suited to in-service application could help to promote a much broader use of this powerful technique in applications across the life cycle of high value civil, maritime and aerospace assets, from the validation of finite element modelling for design to in-service structural integrity assessment. A full-scale fatigue test of a flight-critical aircraft structural component is employed as a case study to demonstrate important aspects of the capability. Future directions in the development and application of low-cost miniaturised systems are also discussed.

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Section: Sensitivity Enhancementmentioning

confidence: 99%

Thermoelastic stress analysis with a compact low-cost microbolometer system

Rajic

Rowlands

2013

Quantitative InfraRed Thermography Journal

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“…(6) by employing the reference response spectrum (of Section 3.1). As mentioned in Section 3.1, is considered as the most accurate representation of the actual response spectra of the CUI, and a linear relationship is expected between and , especially for this CUI [26]. Deviations from such a linear relationship are therefore considered to be the result of measurement inaccuracies resulting from the blackbody source and CUI and not of an inadequate/inaccurate responsivity spectrum of the CUI (as might be the case as stated at the end of Section 2.3).…”

Section: Measurement Setup and Resultsmentioning

confidence: 99%

“…When the CUI is observing a blackbody, the measurement equation for the total signal output of the camera, , can be modelled (cf. [26,27]) by…”

Section: Refinement Of the Proposed Technique For A Non-ideal Instrumentmentioning

confidence: 99%

A technique for resolving the spectral response of a wide-band infrared measuring instrument from measurements without the need for a spectrally tuneable radiation source

Retief

2018

Infrared Physics & Technology

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A technique is presented in which the spectral response of a wide-band infrared measuring instrument is obtained by means of calibration type measurements of a blackbody at various temperature settings and the application of a mathematical technique to these measurements. Successful application of the developed technique is enabled by Tikhonov regularization, which ensures a stable solution to the ill-posed problem of the Fredholm integral equation of the first kind describing the blackbody measurements made by the instrument. The quality of the solution strongly depends, however, on the accuracy of the measurements and the accuracy of the modelled spectrum in describing the emission from the blackbody source. The technique is studied by means of an application to modelled results of instrument measurements, and is then applied to actual measurements made with an infrared camera. It is shown that the technique can, in the absence of specific manufacturer supplied information of the instrument and specialized equipment, be an alternative to the theoretical calculation of the instrument response spectrum or to an experimental determination of the instrument spectral response during which measurements are made of a spectrally tuneable radiation source like a blackbody and monochromator.

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“…The process of gain-and offset-based nonuniformity correction can be visually interpreted, as shown in Fig. 7 Gain tables are calculated and stored in read-only memory (ROM), and the offset is estimated using the lens outfocusing method or a reference bar in a scan-based IRST system. In two-point nonuniformity correction (TPNUC), the scene temperature between T L and T H is assumed.…”

Section: Introductionmentioning

confidence: 99%

Two-point correction and minimum filter-based nonuniformity correction for scan-based aerial infrared cameras

Kim

2012

Opt. Eng

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Two-point correction-based nonuniformity correction of a scanbased long wave infrared camera can be successful in normal working environments. However, the method produces strong fixed-pattern noise in cluttered aerial environments. We analyze the mechanism of such phenomena and propose a nonuniformity correction method by combining a reference-based approach and a nonlinear filter-based residual offset estimation method. The nonlinear filtering process of row directional minimum filtering after two-point correction can remove the nonuniformity around cluttered aerial infrared images. Experimental results validate the feasibility of the proposed method.

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<title>Temperature dependence of spatial noise in InSb focal plane arrays</title>

Cited by 14 publications

References 0 publications

Thermoelastic stress analysis with a compact low-cost microbolometer system

Thermoelastic stress analysis with a compact low-cost microbolometer system

A technique for resolving the spectral response of a wide-band infrared measuring instrument from measurements without the need for a spectrally tuneable radiation source

Two-point correction and minimum filter-based nonuniformity correction for scan-based aerial infrared cameras

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