Electricity: measuring and testing – Magnetic – Magnetometers
Reexamination Certificate
2008-05-13
2008-05-13
Aurora, Reena (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetometers
C324S260000
Reexamination Certificate
active
11318590
ABSTRACT:
A magnetic sensor10includes GMR elements11-18, and heating coils21-24serving as heat generating elements. The elements11-14and15-18are bridge-interconnected to constitute X-axis and Y-axis sensors, respectively. The heating coils21, 22, 23, and24are disposed adjacent to the elements11and12, the elements13and14, the elements15and16, and the elements17and18, respectively. The heating coils21-24, when electrically energized, heat mainly the adjacent elements. Therefore, the elements can be heated and cooled in a short period of time in which constant geomagnetism can be ensured. Data for compensation of temperature-dependent characteristic (ratio of change in sensor output value to variation in element temperature) is obtained on the basis of the temperatures of the elements before and after the heating, and the magnetic sensor outputs before and after the heating. Subsequently, the temperature characteristics of the elements are compensated on the basis of the data.
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Aurora Reena
Dickstein & Shapiro LLP
Yamaha Corporation
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