Sensor signal processing apparatus
AssigneeYamatake Corporation
InventorsTakashi Masuda, Yasuhide Yoshikawa
Life of this patent
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Abstract
A sensor signal processing apparatus includes a sensor section, power supply section, switching section, and CPU. The characteristics of the sensor section change in accordance with a change in physical quantity to be measured. The power supply section supplies powers of two systems having different polarities to the sensor section. The switching section is connected between the power supply section and the sensor section to switch combinations of powers of the two systems from the power supply section while preventing mixing of powers of the two systems. The CPU obtains the ratio between the differences between a plurality of signals output from the sensor section for every switching operation of the switching section.
Claims16
A sensor signal processing apparatus comprising:
- sensor means whose characteristics change in accordance with a change in physical quantity to be measured, wherein said sensor means comprises two sensor elements;
- power supply means for supplying powers of two systems having different polarities to said sensor means;
- switching means, connected between said power supply means and said sensor means, for sequentially switching four combinations of connections between powers of the two systems from said power supply means and said sensor elements while preventing mixing of powers of the two systems such that first to fourth signals are output from the sensor elements, wherein each of the first to fourth signals correspond to one of the four combinations of connections of said switching means;
- and
- arithmetic means for obtaining a first difference between the first and second signals output from said sensor elements, and a second difference between the third and fourth signals output from said sensor elements, and then obtains a ratio between the first and second differences to substantially eliminate at least one of a circuit-based error and an element-based error.
A sensor signal processing apparatus comprising:
- sensor means whose characteristics change in accordance with a change in physical quantity to be measures, said sensor means comprising a first and second sensor element;
- power supply means for supplying powers of a first and second system having different polarities to said sensor;
- switching means for switching first to fourth combinations of connections between said first/second system and said first/second sensor elements;
- and
- arithmetic means for obtaining a ratio of two differences based on four signals output from said sensor means for every switching operation of said switching means corresponding to the first and fourth combinations,
- wherein power of the first system is supplied to the first sensor element and power of the second system is supplied the second sensor element in the first combination,
- wherein power of the first system is supplied to the second sensor element and power of the second system is supplied to the first sensor element in the second combination,
- wherein power of the first system is supplied to the first sensor element in the third combination, and
- wherein power of the second system is supplied to the first sensor element in the fourth combination.
Dependencies are inferred from the claim text.