Thermovision method in stress analysis of textile materials

Mikołajczyk, Z.; Więcek, B.; Michalak, M.

doi:10.21611/qirt.1998.022

Cited by 3 publications

(10 citation statements)

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“…Can it happen that this time will turn out to be much less than the minimal exposure technically available to the IR camera? Another point to be mentioned is that aspiration for lower t in response to the increase in the camera frame rate inevitably results, according to (13), in the requirement of the diminution of M / S (or d), and manufacturing such thin substrates may become unattainable.…”

Section: Evaluation Of the Irt Methods Threshold Sensitivitymentioning

confidence: 99%

“…To gain a better insight into the mechanism of the "thermal flame" ("thermal fire") observed in figures 1-3, a series of experimental tests was performed using water of different temperatures as well as ethyl alcohol or olive oil as alternative liquids. A conceivable heating of fabric due to its mechanical deformation [13] was also put to the test and eliminated from consideration as negligible for our experiments. As a result, we came to recognize that this phenomenon is most likely to be conditioned by heat generation accompanying the adsorption of water vapour by the solid material surface (the adsorption heat release).…”

Section: "Thermal Flame" ("Thermal Fire") Phenomenonmentioning

confidence: 99%

“…A lot of methods are devised for fabric testing. Certain efforts have been made to incorporate IR cameras into these tests [13,15]. With these cameras, heating of manufactured articles and materials under deformation has been investigated, permeability of sailcloths has been studied, the coefficient of heat transmission has been measured, etc.…”

Section: Estimation Of Emissivity Of Solids and Evaluation Of The Objmentioning

confidence: 99%

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Quantitative characterization of vapour adsorption on solid surfaces and estimation of emissivity of solids using infrared thermography

Vainer¹

2008

Proceedings of the 2008 International Conference on Quantitative InfraRed Thermography

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The process of adsorption of water-vapour molecules on uneven (irregular) surfaces of some solid materials at room temperature is registered by infrared camera. The pronounced "thermal flame" ("thermal fire") phenomenon developing on the samples' surfaces is exhibited and quantitatively represented. This thermal effect ranged within an order of magnitude. 3-µm-wavelength emissivities of different fabrics are obtained experimentally with the presented non-standard reflection-based method that needs for a narrow-spectral-range infrared camera. An analytical relationship between the amount of adsorbate and the measurable excess of adsorbent temperature is derived. Exclusively high sensitivity of the FPA-based infrared method as applied to the examination of initial stages of adsorption of gaseous molecules on solid surfaces is discovered. It is shown that the method makes it possible to control an incipient molecular film of 1/300-monolayer effective thickness precipitated on the exposed surface of a bulky material and of 1/600-monolayer thickness in the case of the adsorption on a thin-film adsorbent (with a double-faced surface).

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Section: Evaluation Of the Irt Methods Threshold Sensitivitymentioning

confidence: 99%

Section: "Thermal Flame" ("Thermal Fire") Phenomenonmentioning

confidence: 99%

Section: Estimation Of Emissivity Of Solids and Evaluation Of The Objmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative characterization of vapour adsorption on solid surfaces and estimation of emissivity of solids using infrared thermography

Vainer¹

2008

Proceedings of the 2008 International Conference on Quantitative InfraRed Thermography

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“…A lot of methods are devised for testing of fabric porosity, friability, downiness, hairiness, etc. Certain efforts have been made to incorporate properly the IR cameras into these tests (Mikolajczyk et al, 1998;Zimniewska et al, 2003). The physical principle brought to light in the present work allows establishing a hierarchy of any Downloaded by [North Dakota State University] at 16:26 04 November 2014 tested fabrics (Table 1).…”

Section: Fabricmentioning

confidence: 97%

“…A heating of fabric due to its mechanical deformation (Mikolajczyk et al, 1998) was also put to the test and eliminated from consideration as negligible for our experiments. As a result, we came to recognize that this phenomenon is most likely to be conditioned by heat generation accompanying the adsorption of water vapour by the fabric surface (the adsorption heat release).…”

Section: "Thermal Flame" ("Thermal Fire") Phenomenonmentioning

confidence: 99%

Quantitative characterization of vapour adsorption on solid surfaces and estimation of emissivity of solids using narrow-band short-wave infrared thermography

Vainer

2008

Quantitative InfraRed Thermography Journal

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Advantages of the short-wave (2.5-3 µm) narrow-band infrared thermography are represented. The process of adsorption of water-vapour molecules on uneven surfaces of solid materials (fabrics) at room temperature is registered by the FPA-based infrared camera fulfilling the above-mentioned requirements. The pronounced "thermal flame" ("thermal fire") phenomenon developing on the specimens' surfaces is exhibited and quantitatively represented. This thermal effect ranged within an order of magnitude. 3-µm-wavelength emissivities of different fabrics are obtained experimentally with the presented non-standard reflection-based method that needs for a narrow-band infrared system. An analytical relationship between the amount of adsorbate and the measurable excess of adsorbent temperature is derived. It is shown that the FPA-based infrared thermography makes it possible to control an incipient molecular film of 1/300-monolayer effective thickness precipitated on the exposed surface of a bulky material and of 1/600-monolayer thickness in the case of the adsorption on a thin-film adsorbent (with a double-faced surface).

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Focal plane array based infrared thermography in fine physical experiment

Vainer¹

2008

J. Phys. D: Appl. Phys.

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By two examples of dissimilar physical phenomena causing thermophysical effects, the unique capabilities of one of the up-to-date methods of experimental physics—focal plane array (FPA) based infrared (IR) thermography (IRT), are demonstrated distinctly. Experimenters inexperienced in IRT can grasp how this method provides a means for combining real-time visualization with quantitative analysis. A narrow-band short-wavelength IR camera was used in the experiments. It is discussed and stated that IRT is best matched and suited to the next two test conditions—when a heated specimen is thin and when heat is generated in the immediate region of a surface of a solid. The first prerequisite is realized in the search for directional patterns of combined low-power radiation sources with the use of the IRT-aided method. The second one is realized in studies of water vapour adsorption on uneven (irregular) surfaces of solid materials. With multiple swatches taken from a set of different fabrics and used as experimental samples, a sharp distinction between adsorptivities of their surfaces is strikingly illustrated by IRT time-domain measurements exhibiting the associated thermal effect ranging within an order of magnitude. It is justified that the described IRT-aided test can find practical implementation at least in the light industry. Emissivities of different fabrics are evaluated experimentally with the described reflection method based on the narrow spectral range of IRT. On the basis of direct IR observations, attention is paid to the need for close control over the surface temperature increase while the adsorption isotherms are being measured. Sensitivity of the FPA-based IRT method, as applied to examine the kinetics of initial stages of adsorption of gaseous molecules on the solid surface, is evaluated analytically and quantitatively. The relationship between the amount of adsorbate and the measurable excess of adsorbent temperature is found. It is discovered that the method makes it possible to control nano-quantities of the adsorbed matter, namely, it is sensitive to an incipient molecular film of 1/300-monolayer effective thickness.

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Thermovision method in stress analysis of textile materials

Cited by 3 publications

References 0 publications

Quantitative characterization of vapour adsorption on solid surfaces and estimation of emissivity of solids using infrared thermography

Quantitative characterization of vapour adsorption on solid surfaces and estimation of emissivity of solids using infrared thermography

Quantitative characterization of vapour adsorption on solid surfaces and estimation of emissivity of solids using narrow-band short-wave infrared thermography

Focal plane array based infrared thermography in fine physical experiment

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