Magnetic substance having sharp permeability transition temperat

Details Magnetic substance having sharp permeability transition temperat Magnetic substance having sharp permeability transition temperat

1978-02-27

1980-06-24

Swisher, S. Clement

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01K 738

Patent

active

042089115

ABSTRACT:
A magnetic material which includes an impurity metal of relatively large atomic diameter such as zinc, titanium, zirconium, yttrium, or cadmium introduced uniformly therein in amount sufficient to distort its crystalline structure to alter its anisotrophy so that the permeability of the substance remains substantially constant with changes in temperature up to the permeability transition temperature and; there being also introduced uniformly therein further metallic atoms which achieve a desired transition temperature within an accuracy of at least 0.1.degree. C. such material being utilized in an apparatus adapted to be interrogated to disclose whether its temperature is above or below the transition temperature within at least 0.1.degree. C., the signal propagating properties of the material altering drastically at such temperature, the material having an output which is inherently digital and directly compatible with digital information processing and control without A/D conversion.

REFERENCES:
patent: 3054044 (1962-09-01), Shevel

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