JPH044268U - - Google Patents
Info
- Publication number
- JPH044268U JPH044268U JP4596790U JP4596790U JPH044268U JP H044268 U JPH044268 U JP H044268U JP 4596790 U JP4596790 U JP 4596790U JP 4596790 U JP4596790 U JP 4596790U JP H044268 U JPH044268 U JP H044268U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- detection
- output
- tuning
- oscillation
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
第１図は本考案に係るセラミツク共振器型静電
センサの検波増幅回路の一実施例を示す回路図、
第２図はバイアス回路を付加したセラミツク共振
器型静電センサとして一般的に考えられる回路図
、第３図は増幅回路の入力電圧と出力電圧との関
係を示すグラフ、第４図はＡＭ変調波の検波作用
を示す波形説明図、第５図は一般的な静電センサ
のブロツク図、第６図は静電センサにおける微小
静電容量の検出例を示す説明図である。
１……発振回路、２……同調回路（セラミツク
共振器）、３……検出部、４……検波回路、５…
…増幅回路、６……被検出体、７……インダクタ
ンス素子、８……整流ダイオード、１０……コン
デンサ、１１……抵抗器、１２……カツプリング
コンデンサ、１３……共通基線、１４……バイア
ス回路、１５……抵抗器、１６……可変抵抗器、
１７……入力端子、１８……演算増幅器、１９…
…帰環抵抗器、２０，２１，２２……抵抗器。
FIG. 1 is a circuit diagram showing an embodiment of a detection amplifier circuit of a ceramic resonator type electrostatic sensor according to the present invention;
Figure 2 is a circuit diagram generally considered as a ceramic resonator type electrostatic sensor with a bias circuit added, Figure 3 is a graph showing the relationship between the input voltage and output voltage of the amplifier circuit, and Figure 4 is AM modulation. FIG. 5 is a block diagram of a general electrostatic sensor, and FIG. 6 is an explanatory diagram showing an example of detecting minute capacitance in an electrostatic sensor. DESCRIPTION OF SYMBOLS 1... Oscillation circuit, 2... Tuning circuit (ceramic resonator), 3... Detection section, 4... Detection circuit, 5...
... Amplifier circuit, 6 ... Object to be detected, 7 ... Inductance element, 8 ... Rectifier diode, 10 ... Capacitor, 11 ... Resistor, 12 ... Coupling capacitor, 13 ... Common baseline, 14 ... Bias circuit, 15...resistor, 16...variable resistor,
17...Input terminal, 18...Operation amplifier, 19...
... Return resistor, 20, 21, 22... Resistor.
Claims (1)
回路と、外部静電容量の変化に対応させて前記発
振回路との同調点を変化させ、この同調点の変化
に対応するＡＭ変調波を出力するセラミツク共振
器からなる同調回路と、この同調回路から出力さ
れるＡＭ変調波を検波する検波回路と、検波回路
から出力される検波出力を増幅する増幅回路とを
有するセラミツク共振器形静電センサの検波増幅
回路であつて、前記検波回路には、検波出力レベ
ルを増幅回路のスレツシユホールド電圧より高め
るバイアス回路が設けられているセラミツク共振
器形静電センサの検波増幅回路。 An oscillation circuit that includes a built-in resonator and outputs an oscillation frequency signal, and a tuning point between the oscillation circuit and the oscillation circuit is changed in response to changes in external capacitance, and an AM modulated wave corresponding to the change in the tuning point is output. A ceramic resonator type electrostatic sensor having a tuning circuit made of a ceramic resonator, a detection circuit for detecting an AM modulated wave output from the tuning circuit, and an amplifier circuit for amplifying the detection output output from the detection circuit. 1. A detection amplification circuit for a ceramic resonator type electrostatic sensor, wherein the detection amplification circuit is provided with a bias circuit for raising a detection output level above a threshold voltage of the amplification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990045967U JP2530866Y2 (en) | 1990-04-27 | 1990-04-27 | Detection and amplification circuit of ceramic resonator type electrostatic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990045967U JP2530866Y2 (en) | 1990-04-27 | 1990-04-27 | Detection and amplification circuit of ceramic resonator type electrostatic sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH044268U true JPH044268U (en) | 1992-01-16 |
| JP2530866Y2 JP2530866Y2 (en) | 1997-04-02 |
Family
ID=31560624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990045967U Expired - Lifetime JP2530866Y2 (en) | 1990-04-27 | 1990-04-27 | Detection and amplification circuit of ceramic resonator type electrostatic sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2530866Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011226901A (en) * | 2010-04-20 | 2011-11-10 | Mitsutoyo Corp | Variable capacitance displacement gauge |
| CN113552424A (en) * | 2021-06-29 | 2021-10-26 | 中国人民解放军火箭军工程大学 | Weak static signal collection system of aeroengine gas circuit granule |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS586540A (en) * | 1981-07-02 | 1983-01-14 | Alps Electric Co Ltd | Static capacitance detecting circuit for video disc |
-
1990
- 1990-04-27 JP JP1990045967U patent/JP2530866Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS586540A (en) * | 1981-07-02 | 1983-01-14 | Alps Electric Co Ltd | Static capacitance detecting circuit for video disc |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011226901A (en) * | 2010-04-20 | 2011-11-10 | Mitsutoyo Corp | Variable capacitance displacement gauge |
| CN113552424A (en) * | 2021-06-29 | 2021-10-26 | 中国人民解放军火箭军工程大学 | Weak static signal collection system of aeroengine gas circuit granule |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2530866Y2 (en) | 1997-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |