Boots – shoes – and leggings
Patent
1984-03-05
1986-08-19
Chin, Gary
Boots, shoes, and leggings
364508, 73602, 73599, G01N 2900, G06F 1520
Patent
active
046073418
ABSTRACT:
A method which determines at least one property of a material by measuring the ultrasonic absorption in this material. In carrying out this method, the material is subjected to an ultrasonic wave having an intensity varying in time. Such a method can be performed by measuring a temperature modulation, produced by absorption of the ultrasonic wave in a probed region of the material, at a surface area corresponding to this probed region, by measuring the ultrasonic power over the probed region, and by calculating the ultrasonic absorption in this probed region from the measured surface temperature modulation and the measured ultrasonic power for the purpose of determining at least one property of the material. Of course, the calculated ultrasonic absorption is representative of this material property. The method can also be carried out by subjecting the material to an external cause for varying its ultrasonic absorption, by measuring a relative variation, due to the external cause, of the temperature modulation at a surface area of the material corresponding to a region of this material subjected to the ultrasonic wave, and by measuring a variation of attenuation of the ultrasonic wave in the material due to the external cause. Thereafter, the ultrasonic absorption in the material is calculated from the measured relative variation of the temperature modulation and from the measured attenuation in order to determine at least one property of the material.
REFERENCES:
patent: 3858437 (1975-01-01), Jarzynski et al.
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patent: 4454585 (1984-06-01), Ele
patent: 4543827 (1985-10-01), Tominaga et al.
Journal of Metals, Sep. 1979, Edmund G. Henneke, II, et al., Virginia Polytechnic Institute and State University, Blacksburg, Va. "Thermography--An NDI Method for Damage Detection", pp. 11-15.
K. L. Reifsnider et al., Engineering Science and Mechanics Department Virginia Polytechnic Institute and State University, Blacksburg, Virginia 240 61, "The Mechanics of Vibrothermography", pp. 249-276.
Canadian Patents and Development Limited
Chin Gary
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