Reflection-Mirage Measurements of Thermal Diffusivity

Reyes, C. B.; Jaarinen, J.; Favro, L. D.; Kuo, P. K.; Thomas, R. L.

doi:10.1007/978-1-4613-1893-4_31

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…. , ; ; l _ _ _ _ t (<I>rr (5) i=l wheref<l>f means the experimental deflection signal value in point i transformed into k-space, and <l>i the corresponding value obtained by fitting. n is the number of data points measured.…”

Section: Theorymentioning

confidence: 99%

See 1 more Smart Citation

The Use of Optical Beam Deflection (OBD) Technique in the Thermal Diffusivity Characterization of Polymer Foils

Rantala

Wei

Kuo

et al. 1993

Review of Progress in Quantitative Nondestructive Evaluation

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Section: Theorymentioning

confidence: 99%

“…However, this can be measured by the optical beam deflection (OBD, mirage) technique [3]. Already the method has been applied to higher diffusivity samples than polymers, covering the range between 20 -0.02 cm 2 /s [4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

The Use of Optical Beam Deflection (OBD) Technique in the Thermal Diffusivity Characterization of Polymer Foils

Rantala

Wei

Kuo

et al. 1993

Review of Progress in Quantitative Nondestructive Evaluation

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“…Thus, it is important in doing such experiments to use an experimental arrangement which minimizes the height of the beam. The present measurements are done using a technique [7] to bounce the probe beam from the sample surface has been developed to minimize the distance between the probe beam and the sample.…”

Section: Description Of Techniquementioning

confidence: 99%

Thermal Wave Characterization of Coated Surfaces

Jaarinen

Reyes

Oppenheim

et al. 1987

Review of Progress in Quantitative Nondestructive Evaluation

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“…3) can also be utilized for the characterization of thennal properties of pure and coated materials [22][23][24][25][26]. The experimental technique is to mea surI' the transverse deflection of the (stationary) probe beam as the heating beam is scanned across the sample surface at right angles to the probe beam with a constant probe beam height and with the sample held stationary.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

“…More detailed agreement can be obtained, and the technique can be extended to the case of coated surfaces, by comparison to three dimensional thermal diffusion calculations of the mirage effect signal for this geometry. The re ader is referred to two papers [25,26] in this volume for further details of the method and the accompanying theoretical developmf'nts. Several other papers in this volume and other volumes of this ser ies describe thermal wave measurements in the time domain which have been used to measure thermal diffu5ivities of bulk materials and thin films.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

Thermal Wave Techniques for Imaging and Characterization of Materials

Favro

Kuo

Thomas

1987

Review of Progress in Quantitative Nondestructive Evaluation

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Thermal wave imaging is proving to be a useful teehnique for the nondestruetive evaluation (NDE) of subsurfaee features of opaque solids. This imaging is aehieved with various intensity-modulated heat sources, such as laser or partiele beams, and with various detectors, sueh as microphones, ultrasonic transducers, inErared detectors, and laser probes. The authors have recently reviewed these techniques and their application to t\DE (1). Common to the techniques is the fact that they eaeh involve the interaction of a highly damped the nnal wave wi th sur face or subsur face therma 1 fea ture s. They al so have in coml:lOn tlle fact that the souree is localized. The techniques differ in that the detectors may be local or non-local to a greater or lesser degree. For example, the focused infrared detector is a local point telnperature detector; the mirage effect laser probe is a line de tec tor; and tlle mic ro phone i s an area detec tor. The prese.nce of the localized source gives alI of these methods tlle potential for high spatial resolution. The symmetry oE the non-locality of the detector, however, may seriously limit detection of particular kinds of flaws. For some of the detection schemes, comparisons between experiment and theory for imaging of flaws with simple geometry (planar eracks, cylindrical or spherical inclusions) are straightforward, and good agreement has been achieved in most cases. Other schemes, such as p iezoe lec t r ic de tec t ion, are lIIore complex in na ture. For exaOl ple, the details of the conversion Erom thermal energy to acoustie energy may involve several different processes, and no quantitative three-dimensional theoretical lIIodel yet exists to assess the relative importance of these processes. In this section we give a briei review of the principles of imaging in tlle extreme near field, followed by deseriptions of three splected experimental thermal wave imaging techniques, including geometrical considerations, signal-to-noise considerations, and examples of NDE applieations. For descriptions of other thermal wave imaging teehniques the reader is referred to the literature (1).TIle resolution of any microscope depends on its ability eitller to localize tlle illumination at tlle scatterer (typical of scanning microseopes) or to localize tlle region of the seatterer to whieh the detector is sensitive (such as in conventional microscopes, whieh focus different points of the scatterer on different detectors). In microscopes which usp lenses as focusing elements to achieve this localization, t!te localization is limited by the wavelengtll of tlle 293

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Reflection-Mirage Measurements of Thermal Diffusivity

Cited by 8 publications

References 3 publications

The Use of Optical Beam Deflection (OBD) Technique in the Thermal Diffusivity Characterization of Polymer Foils

The Use of Optical Beam Deflection (OBD) Technique in the Thermal Diffusivity Characterization of Polymer Foils

Thermal Wave Characterization of Coated Surfaces

Thermal Wave Techniques for Imaging and Characterization of Materials

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