Meandering winding test circuit
First Claim
1. A test circuit comprising:
- a meandering primary winding having extended portions for imposing a spatially periodic magnetic field of at least two spatial wavelengths in a test substrate; and
a sensing winding array of sensing elements, with a sensing element positioned every half wavelength of at least two spatial wavelengths between respective adjacent extended portions of the primary winding for sensing response of the test substrate to the imposed magnetic field, the sensing elements including an individual sensing coil at least every other half wavelength, each individual sensing coil having separate output connectors.
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Accused Products
Abstract
A meandering winding magnetometer (MWM) includes a meandering primary winding and at least one sensing winding or coil on a membrane to be pressed against a test surface. The membrane may be supported on a flexible carrier which is translatable into a probe. Abutments in the probe press the carrier against the test surface but allow the carrier and membrane to conform to the test surface. One MWM circuit includes meandering primary and secondary windings. The return leads from the secondary winding return to connector pads in close alignment with the test array, while leads from the primary winding are spaced at least one wavelength from the array. In another MWM circuit, individual sensing loops are positioned within the meandering primary winding. The MWM circuit may be provided on an adhesive tape which may be cut to length.
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Citations
12 Claims
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1. A test circuit comprising:
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a meandering primary winding having extended portions for imposing a spatially periodic magnetic field of at least two spatial wavelengths in a test substrate; and a sensing winding array of sensing elements, with a sensing element positioned every half wavelength of at least two spatial wavelengths between respective adjacent extended portions of the primary winding for sensing response of the test substrate to the imposed magnetic field, the sensing elements including an individual sensing coil at least every other half wavelength, each individual sensing coil having separate output connectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A test circuit comprising:
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a meandering primary winding having extended portions for imposing a spatially periodic magnetic field in a test substrate; a meandering sensing winding including extended portions positioned between extended portions of the meandering primary winding to one side of the primary winding for sensing response of the test substrate to the imposed magnetic field; and single loop sensor coils positioned between extended portions of the meandering primary winding to the other side of the primary winding for sensing response of the test substrate to the imposed magnetic field.
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Specification