Method and apparatus for measuring the thickness of a layer of g

Details Method and apparatus for measuring the thickness of a layer of g Method and apparatus for measuring the thickness of a layer of g

1989-08-30

1991-12-10

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324635, 324644, G01V 308, G01V 310, G01V 312, G01R 2704

Patent

active

050721720

ABSTRACT:
A method of determining the thickness of a layer of material, such as soil, wood, ice or coal, that utilizes a microstrip antenna as a thickness measuring sensor. The sensor is positioned over the layer and a value for a parameter of the antenna such as conductance or resonant frequency is measured. The value is compared to a calibration table of values and the thickness of the layer is determined by interpolation. Alternatively, the value is compared to a control value to initiate a decision process. The decision could be that a layer of ice is building up on a wing of an aircraft or that an explosive device is buried under a layer of soil.

REFERENCES:
patent: 4623835 (1986-11-01), Mehdizadch et al.
Hansen et al., "Input Inpedance and Mutal Coupling of Rectangular Microstrip Patch Antennas with a Dielectric Cover", 1986 Microwaves Enbitions and Publishers Ltd., pp. 360-365.
Chang et al., "An Analysis of a Resonant Loop as an Electromagnetic Sensor of Coal Seam Thickness", Proceedings of URSI Conference on Propagation in Non Ionized Media, 5/1977, pp. 1-6.

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