Title:
SENSOR SIGNAL PROCESSING CIRCUIT
Document Type and Number:
Japanese Patent JP3969027
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve sensor measurement accuracy and obtain quick responsivity.
SOLUTION: This sensor signal processing circuit is provided with a capacitance-type sensor part with characteristics which changes as a whole according to changes in a physical quantity to be measured, an electric power source part with at least two types of A.C. power sources with different polarities or phases, and an arithmetic part connected to the output side of the sensor part for performing arithmetic processing for obtaining the difference, ratio, etc., of signals due to sensor capacitance. The sensor signal processing circuit is provided with a part for synchronously detecting output signals of the arithmetic part by two types of A.C. signals with different polarities or phases, and measurement and responsivity in measuring physical quantities are heightened by the sensor signal processing circuit.
Inventors:
Yasuo Masuda
Yasuhide Yoshikawa
Yasuhide Yoshikawa
Application Number:
JP2001225618A
Publication Date:
August 29, 2007
Filing Date:
July 26, 2001
Export Citation:
Assignee:
YAMATAKE CORPORATION
International Classes:
G01L13/06; G01D5/24; G01L9/12; G01P15/125; (IPC1-7): G01L13/06; G01L9/12; //G01D5/24
Domestic Patent References:
| JP2001033330A |
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