Title:
【発明の名称】精密容量性トランスデューサ回路と方法
Document Type and Number:
Japanese Patent JP2936286
Kind Code:
B2
Abstract:
A method and means for determining the deflection of a movable element in a transducer by measurement of capacitance. The result is independent of extraneous capacitance between the transducer terminals and the environment, of the magnitude of the transducer capacitance, and of scaling factors within the measurement circuits. The difference and sum of differential capacitances are determined, preferably independently of their individual values, using switching techniques and a common measurement circuit. The ratio of differential capacitances is determined by causing the measurement signal for one capacitance to be inversely proportional to the magnitude of the other capacitance.
Inventors:
KYADOERU RABATO MAAUIN
Application Number:
JP50288990A
Publication Date:
August 23, 1999
Filing Date:
January 25, 1990
Export Citation:
Assignee:
DORETSUSA NAGANO INC
International Classes:
G08C19/10; G01D5/241; G01R27/26; (IPC1-7): G08C19/10
Domestic Patent References:
| JP5316696B2 |
Attorney, Agent or Firm:
Sanada Yuzo (2 outside)