CN1062214A - Frequency-converting measuring system for micro-changing of small capacitance - Google Patents
Frequency-converting measuring system for micro-changing of small capacitance Download PDFInfo
- Publication number
- CN1062214A CN1062214A CN 91110701 CN91110701A CN1062214A CN 1062214 A CN1062214 A CN 1062214A CN 91110701 CN91110701 CN 91110701 CN 91110701 A CN91110701 A CN 91110701A CN 1062214 A CN1062214 A CN 1062214A
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- circuit
- pass filter
- low
- unidirectional
- high frequency
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention belongs to the electronic surveying field, relate to the little capacitance measuring device that diminishes of a kind of frequency conversion, be used for measuring the subtle change of little electric capacity.Partly form by transfiguration control frequency type high frequency multi-resonant oscillating circuit, unidirectional differentiating circuit A, quartzy high frequency multi-resonant oscillating circuit, unidirectional differentiating circuit B, bistable circuit, low-pass filter circuit A, Shi Mite circuit, unidirectional differentiating circuit C, monostable circuit, low-pass filter circuit B, record display terminal etc., be mainly used in the measuring equipment that adopts capacitive transducer.
Description
The invention belongs to the electronic surveying field.
The method of traditional measurement differential capacitance is a bridge method.Through investigation, the inventor does not also find to use the precedent of the principle of the invention.This method possesses practicality, and its maximum characteristics are high sensitivity.
Frequency-converting measuring system for micro-changing of small capacitance can be widely used in the measurement mechanism of capacitive transducer.
The former substantially of frequency conversion differential capacitance measuring system is: by signal of transfiguration control frequency type high frequency multi-resonant oscillating circuit output, the output signal of this signal and another quartzy high frequency multi-resonant oscillating circuit is added in resetting and the set end of a differential input bistable circuit simultaneously respectively, the output of bistable circuit connects a low-pass filter circuit, the output of low-pass filter circuit connects the single-shot trigger circuit of the special input of a band application rice again, connect a low-pass filter circuit afterwards again, connect the record display terminal after the low-pass filter circuit again.
Figure is the former block diagram of frequency-converting measuring system for micro-changing of small capacitance.Among the figure, the transfiguration control is type high frequency multi-resonant oscillating circuit (1), unidirectional differentiating circuit A(2 frequently), quartzy high frequency multi-resonant oscillating circuit (3), unidirectional differentiating circuit B(4), bistable circuit (5), low-pass filter circuit A(6), Shi Mite circuit (7), unidirectional differentiating circuit C(8), monostable circuit (9), low-pass filter circuit B(10), record display terminal (11).
The novel measuring system of this kind can be applicable in the measurement device relevant with vibration, ripple and pressure change such as typhoon forecast instrument, earth-quake predictor. Its advantage is highly sensitive.
Claims (1)
- The little capacitance measuring device that diminishes of a kind of frequency conversion, it is characterized in that: the transfiguration control output of type high frequency oscillator frequently and the output of another quartzy high frequency oscillator are added to resetting of bistable circuit and set end behind differential, the output of bistable circuit is again through low-pass filter circuit, the Shi Mite circuit, differentiating circuit, monostable circuit and low-pass filter circuit are handled, and just obtain differential capacitance information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91110701 CN1062214A (en) | 1991-11-16 | 1991-11-16 | Frequency-converting measuring system for micro-changing of small capacitance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91110701 CN1062214A (en) | 1991-11-16 | 1991-11-16 | Frequency-converting measuring system for micro-changing of small capacitance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1062214A true CN1062214A (en) | 1992-06-24 |
Family
ID=4910230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91110701 Pending CN1062214A (en) | 1991-11-16 | 1991-11-16 | Frequency-converting measuring system for micro-changing of small capacitance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1062214A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100394202C (en) * | 2006-01-24 | 2008-06-11 | 东北大学 | High voltage alternate driver circuit for determining micro capacitance |
| CN102750828A (en) * | 2012-07-24 | 2012-10-24 | 苏州工业园区七星电子有限公司 | Crossing vehicle flow monitoring system |
| CN104050758A (en) * | 2013-03-14 | 2014-09-17 | 鸿富锦精密工业(武汉)有限公司 | Shipment detection system |
| CN107167673A (en) * | 2017-05-10 | 2017-09-15 | 南京大学 | A kind of sensor of detectable charge variation feature |
-
1991
- 1991-11-16 CN CN 91110701 patent/CN1062214A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100394202C (en) * | 2006-01-24 | 2008-06-11 | 东北大学 | High voltage alternate driver circuit for determining micro capacitance |
| CN102750828A (en) * | 2012-07-24 | 2012-10-24 | 苏州工业园区七星电子有限公司 | Crossing vehicle flow monitoring system |
| CN104050758A (en) * | 2013-03-14 | 2014-09-17 | 鸿富锦精密工业(武汉)有限公司 | Shipment detection system |
| CN104050758B (en) * | 2013-03-14 | 2017-01-18 | 青岛申坤伟业工贸有限公司 | shipment detection system |
| CN107167673A (en) * | 2017-05-10 | 2017-09-15 | 南京大学 | A kind of sensor of detectable charge variation feature |
| CN107167673B (en) * | 2017-05-10 | 2020-06-12 | 南京大学 | Sensor capable of detecting charge change characteristics |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |