Method for controlling the thickness of a layer of material in a

Details Method for controlling the thickness of a layer of material in a Method for controlling the thickness of a layer of material in a

1991-09-11

1993-02-23

Snow, Walter E.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Ore/rock interface determination during cutting

324332, E21C 3524

Patent

active

051884267

ABSTRACT:
A method for 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), Mehdizadeh et al.
patent: 4753484 (1988-06-01), Stolarczyk et al.

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