Method and device for analyzing and measuring physical parameter

Details Method and device for analyzing and measuring physical parameter Method and device for analyzing and measuring physical parameter

1987-02-05

1989-10-17

Lall, Parshotam S.

Boots, shoes, and leggings

364557, 364563, 73601, 378 89, G01N 2141, G06F 1520

Patent

active

048751758

ABSTRACT:
A method and a device are used to analyze and measure by means of radiometry physical parameters of a layered material. These parameters include the absorptivity B, the diffusivity A of the surface layer and the thermal resistance R of the interface between the two layers. A sample of the material is excited by means of a flux of thermal energy amplitude modulated at a high frequency and a low frequency. The parameters are computed from the measured phase shift and amplitude of the resulting thermal signal. The method and the device are applicable to non-destructive testing of industrial products.

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G. Busse, "Optoacoustic Phase Angle Measurement for Probing a Metal", Nov. 15, 1979, pp. 759-760.
G. Busse, "Thermal Wave Remote and Nondestructive Inspection of Polymers", Applied Physics Letters, Aug. 15, 1983, pp. 355-357.
Aithal et al, "Photoacoustic Characterization of Subsurface Defects in Plasma-Sprayed Coatings", Thin Solids Films, Sep. 1984, pp. 153-158.
Lopatkin et al, "Laser Modulation Photothermal Radiometer--a New Method for Measuring Weak Absorption in Bulk Materials and Coatings", Feb. 1985.

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