JPS56108970A - Extraction of square root type impedance change detector - Google Patents
Extraction of square root type impedance change detectorInfo
- Publication number
- JPS56108970A JPS56108970A JP1111780A JP1111780A JPS56108970A JP S56108970 A JPS56108970 A JP S56108970A JP 1111780 A JP1111780 A JP 1111780A JP 1111780 A JP1111780 A JP 1111780A JP S56108970 A JPS56108970 A JP S56108970A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- impedance element
- oscillator
- extraction
- square root
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
PURPOSE:To detect the mechanical displacements stable against ambient temp. fluctuations as electric signals, amplify these signals with good stability and transmit the same to the outside. CONSTITUTION:The sensor parts 1 provided with the 1st and 2nd impedance element created between electrodes 11-12 and 12-13 are connected alternately to a variable frequency type oscillator 3 according to the switching periods of switches 21, and 22. In the 1st period, the signal of a frequency f1 corresponding to the capacity of the 1st impedance element is generated from the oscillator 3, and in the 2nd period, the signal of a frequency f2 corresponding to the capacity C2 of the 2nd impedance element is generated from the oscillator 3. In an arithmetic part 4, the duty cycle signal B associating to the frequencies f1, f2 is supplied to an extraction means 5'. In the means 5', the analog signal D of the value proportional to D= [(f1-f2)/(f1+f2)]<1/2> is outputted and the signal propotional to D is outputted from an output part 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1111780A JPS56108970A (en) | 1980-02-01 | 1980-02-01 | Extraction of square root type impedance change detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1111780A JPS56108970A (en) | 1980-02-01 | 1980-02-01 | Extraction of square root type impedance change detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56108970A true JPS56108970A (en) | 1981-08-28 |
Family
ID=11769060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1111780A Pending JPS56108970A (en) | 1980-02-01 | 1980-02-01 | Extraction of square root type impedance change detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56108970A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0303442A2 (en) * | 1987-08-10 | 1989-02-15 | Moore Products Co. | Multi-frequency capacitance sensor |
| EP0322193A2 (en) * | 1987-12-23 | 1989-06-28 | Tokyo Electric Co. Ltd. | Electronic weighing instrument of the electrostatic capacity type |
-
1980
- 1980-02-01 JP JP1111780A patent/JPS56108970A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0303442A2 (en) * | 1987-08-10 | 1989-02-15 | Moore Products Co. | Multi-frequency capacitance sensor |
| EP0322193A2 (en) * | 1987-12-23 | 1989-06-28 | Tokyo Electric Co. Ltd. | Electronic weighing instrument of the electrostatic capacity type |
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