Thermal wave imaging with phase sensitive modulated thermography

Busse, G.; Wu, D.; Karpen, W.

doi:10.1063/1.351366

Cited by 589 publications

(316 citation statements)

References 19 publications

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“…The lack of change in Δɸ confirms the conclusion drawn from TSA that it may be inappropriate to 121 classify the PTFE insert as a defect as the load applied is unable to open the defect and the PTFE defect is having no effect on the joint mechanism. …”

Section: Ptfesupporting

confidence: 65%

“…Temperature contrast methods have been successfully used to show the sensitivity of systems for; minimum detectable defect size [121], the thermal resistance of a delamination air gap of various thickness [122] and insert thickness [123]. Generally, depth predictions from thermal contrast methods give good results for very large defects where 3D…”

Section: Heat Transfermentioning

confidence: 99%

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Development of Infrared Techniques for Practical Defect Identification in Bonded Joints

Waugh

2016

Springer Theses

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Section: Ptfesupporting

confidence: 65%

Section: Heat Transfermentioning

confidence: 99%

Development of Infrared Techniques for Practical Defect Identification in Bonded Joints

Waugh

2016

Springer Theses

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“…[1,2] Spatially resolved thermal sensing enables failure detection in technological systems when the failure mechanism is correlated with localized changes in temperature. Indeed, IR-imaging systems have become ubiquitous for applications where line-of-sight contact can be made between the measured object and the camera lens.…”

mentioning

confidence: 99%

Thermal‐Sensing Fiber Devices by Multimaterial Codrawing

et al. 2006

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Thermal sensing and thermography yield important information about the dynamics of many physical, chemical, and biological phenomena. [1,2] Spatially resolved thermal sensing enables failure detection in technological systems when the failure mechanism is correlated with localized changes in temperature. Indeed, IR-imaging systems have become ubiquitous for applications where line-of-sight contact can be made between the measured object and the camera lens. Nevertheless, many critical applications do not lend themselves to radiative IR imaging because of the subterraneous nature of the monitored surface, spatial constraints, or cost considerations. The recent challenge of monitoring the skin temperature beneath the thermal tiles on the space shuttle represents a good example in which high-spatial-resolution information is required on very large surface areas but which cannot be obtained using traditional thermal-imaging systems. Thus, the problem of continuously monitoring and detecting a thermal excitation on very large areas (100 m 2 ) with high resolution (1 cm 2 ) is one that has remained largely unsolved. [3,4] We present a new methodology for measuring spatially resolved temperature information on large areas with high spatial resolution and low cost. Underlying our approach is a new fiber material that senses heat along its entire length and generates an electrical signal. This is in contrast to all previous work on thermal sensing using fibers, which require the use of optical probing signals. [5] Although the fibers are produced by thermal drawing, they contain a set of materials that have not been traditionally associated with this process. The use of thermal drawing guarantees the production of extremely long fibers, while the innovation in preparation of the preform and choice of materials allows the incorporation of novel functionalities. Specifically, both thermal and electrical functionalities are obtained in the fibers studied in this communication, while optical and optoelectronic functionalities in alternative designs have been obtained previously and are reported elsewhere. [6,7] The fibers are produced by a novel fabrication technique that enables the incorporation of materials with widely disparate electrical and thermal properties in a single, macroscopic, cylindrical preform rod, which subsequently undergoes thermal drawing to give solid-state microstructured fibers with high uniformity. The main requirements in the materials used in this preform-to-fiber approach are as follows: 1) the component which supports the draw stress should be glassy, so as to be drawn at reasonable speeds in a furnace, with self-maintaining structural regularity; 2) the materials must be above their respective softening or melting points at the draw temerature to enable fiber codrawing; and 3) the materials should exhibit good adhesion/wetting in the viscous and solid states without delamination, even when subjected to thermal quenching. According to these requirements, we identified suitable semiconducting, ins...

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“…However, in the phase image the surface structures are suppressed to reveal only thermal structure in the sample [3]. Fig.…”

Section: Principle Of Thermal Wave Thermographymentioning

confidence: 99%

Applications of phase sensitive thermography for nondestructive evaluation

Karpen

Haupt

et al. 1994

J. Phys. IV France

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Abstract:The technique of thermal wave thermography combines advantages of both conventional thermal wave measurement and thermography using a commercial IR camera. This technique allows for shorter imaging time and depth profiling. Non-uniformity of heating area and optical surface structures can be suppressed in phase images. Several examples show the potential applications of thermal wave thermography in the field of non-destructive testing.

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Thermal wave imaging with phase sensitive modulated thermography

Cited by 589 publications

References 19 publications

Development of Infrared Techniques for Practical Defect Identification in Bonded Joints

Development of Infrared Techniques for Practical Defect Identification in Bonded Joints

Thermal‐Sensing Fiber Devices by Multimaterial Codrawing

Applications of phase sensitive thermography for nondestructive evaluation

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