Temperature compensation of a flux drive gyromagnetic system
AssigneeRCA Corporation
InventorsHenry F. Inacker, Elmer L. Henderson
Life of this patent
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Abstract
A flux drive gyromagnetic system such as a gyromagnetic waveguide phase shifter is temperature compensated by measuring the flux change in the gyromagnetic material during a reverse in saturation magnetization, comparing that change to the change under reference conditions and modifying the drive used to set the gyromagnetic material to a non-saturated condition in accordance with the results of the comparison.
Claims6
A system for temperature compensation of a flux drive gyromagnetic system, said compensation system including:
- means for switching the gyromagnetic structure of said gyromagnetic system from a saturated condition in one direction to a saturated condition in an opposing direction;
- means for measuring the amount of flux change in said gyromagnetic structure during said switching;
- means for determining from said measured flux change and a reference value the amount of compensation to be used;
- and
- means for modifying the drive signal which is used to set the gyromagnetic structure to a desired non-saturated condition in accordance with the amount of compensation determined by said means for determining.
A method of compensating for the variation with temperature of the magnetization characteristics of the gyromagnetic material of a gyromagnetic structure, said method comprising:
- saturating said gyromagnetic material in a first direction;
- driving said gyromagnetic material to a saturated condition in an opposing direction;
- measuring the total flux change in said gyromagnetic material during said driving step;
- comparing the flux change measured in said measuring step with the flux change under reference conditions;
- and
- modifying the drive signal used to set said gyromagnetic material to a desired non-saturated condition in an inverse fashion to the determined relationship between said measured flux and said reference flux.
A method of compensating for temperature induced variations in the response of a gyromagnetic material, said method comprising:
- first driving said gyromagnetic material to a saturated condition in a first direction;
- second driving said gyromagnetic material to a saturated condition in an opposing direction;
- measuring the total flux change in said gyromagnetic material during said second driving step;
- determining a drive sensitivity for said gyromagnetic material, said drive sensitivity being equal to the flux change under reference conditions divided by the measured flux change;
- and
- driving said gyromagnetic material with a drive signal equal to said drive sensitivity times the drive signal which would be utilized under reference conditions to obtain a desired change in the magnetization of said gyromagnetic material, thereby compensating for the temperature variation of the response of the gyromagnetic material to a given drive signal.
Dependencies are inferred from the claim text.