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US 4,105,971 AGranted
Permeability responsive oscillator for detecting phase transformations at various cooling rates
OwnerHarri Nevalaineninventor
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Abstract
A device for detecting phase transformations in a magnet material is disclosed. A sample is placed in a coil coupled to a harmonic oscillator and subjected to heat radiation means for simulating predetermined heating and cooling rates which result in phase transformations within the material being tested. The phase transformations are a function of changes in magnetic permeability which vary with temperature changes.
Claims11
A device for detecting phase transformations in a magnetic permeable material as a function of temperature change comprising:
- test sample holding means;
- heating means for automatically effecting a variety of elevated temperatures in the sample being tested;
- means for automatically and rapidly controlling the cooling rate of said test sample after it has been heated to said elevated temperature;
- means for detecting phase transformations of said sample being tested as a function of temperature by changes in the magnetic property of said test sample as said sample cools from its elevated temperature, said detecting means including a coil operatively coupled to said test sample, a harmonic oscillator operatively coupled to said coil, said coil constituting the frequency determining inductance of said oscillator;
- means for automatically sensing the temperature of said sample as it cools;
- whereby phase changes in the test sample cause changes of the magnetic properties of said magnetic permeable material which in turn cause changes in the oscillator frequency of said harmonic oscillator, said frequency being detected along with the temperature to yield information for use in preparing continuous cooling phase transformation diagrams.
3 more elements
Dependencies are inferred from the claim text.