CN103278697A - Wave detection method for improving detection sensitivity and stability of capacitance fuze and detection circuit - Google Patents
Wave detection method for improving detection sensitivity and stability of capacitance fuze and detection circuit Download PDFInfo
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- CN103278697A CN103278697A CN2013101659810A CN201310165981A CN103278697A CN 103278697 A CN103278697 A CN 103278697A CN 2013101659810 A CN2013101659810 A CN 2013101659810A CN 201310165981 A CN201310165981 A CN 201310165981A CN 103278697 A CN103278697 A CN 103278697A
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Abstract
The invention discloses a wave detection method for improving detection sensitivity and stability of a capacitance fuze and a capacitance detection circuit for the capacitance fuze based on the wave detection method, which are suitable for the condition that the wave detection mode is the triode wave detection. The method comprises the following step of serially connecting a resistor between an emitter of a triode of a triode wave detection circuit and a wave detection voltage output end, wherein the resistor is used for increasing the input impedance of the wave detection circuit. The method and the circuit have the advantages that by increasing the input impedance of the wave detection circuit, the stability of the outputted wave detection voltage of the wave detection circuit and the sensitivity of the change of coupling capacitance are improved; and the implementation is simple, and the practical effect is good.
Description
Technical field
The present invention relates to the electric capacity fuze Detection Techniques, be specifically related to a kind of demodulation method that improves existing electric capacity fuze detection sensitivity and degree of stability, and a kind of electric capacity fuze capacitive detection circuits of this demodulation method of application.
Background technology
The electric capacity influence fuse utilize bullet and target near the time distribution changes in capacitance and the detection of a target.When fuse during near target, the interelectrode electric capacity of fuse will change, and this changes in capacitance amount be detected as echo signal be used, and can control fried point, realize the predetermined height of burst.The raising of the electric capacity fuze height of burst and reliability depends on that the electric capacity fuze detector is to playing sensitivity and the stability that the small capacitance variation detects between electrode in the order motion process.
Summary of the invention
In view of this, the invention provides a kind of demodulation method that improves electric capacity fuze detection sensitivity and degree of stability, can improve electric capacity fuze detection sensitivity and stability, thereby improve the height of burst and the reliability of electric capacity influence fuse.
This improves the demodulation method of electric capacity fuze detection sensitivity and degree of stability, be applicable to that the detection form is the situation of triode detection, its solution is, in the triode detection circuit, between the emitter of triode and detecting circuit output terminal, be connected in series the resistance that is used for improving detecting circuit input impedance.
The present invention also provides a kind of electric capacity fuze capacitive detection circuits based on above-mentioned demodulation method, can improve electric capacity fuze detection sensitivity and stability, thereby improves the height of burst and the reliability of electric capacity influence fuse.
This electric capacity fuze capacitive detection circuits is made up of pierce circuit, detecting circuit and two coupling electrodes, and pierce circuit is connected with two coupling electrodes respectively one to one with detecting circuit; Described detecting circuit comprises resistance R 1～resistance R 4, capacitor C 1, diode D1 and triode Q2;
The base stage of triode Q2 connects wherein the negative electrode of a coupling electrode and diode D1, simultaneously by resistance R 1 ground connection; The collector of triode Q2 connects power Vcc by resistance R 2; Capacitor C 1 and resistance R 3 backs in parallel one end ground connection, the other end connects the anode of diode D1, connects the emitter of triode Q2 simultaneously by resistance R 4; Resistance R 4 is drawn detecting circuit output terminal Ud with the junction of capacitor C 1.
Beneficial effect:
For the triode detection circuit, it is lower at first to analyze the input impedance that detecting circuit sensitivity is low, the reason of degree of stability difference is detecting circuit.So, by adjusting the input impedance of detecting circuit, can improve the degree of stability of detecting circuit output detecting circuit and the susceptibility that coupling capacitance is changed.
Therefore the present invention has increased the resistance R 4 that is connected in series between the emitter of triode Q2 and detecting circuit output terminal, adopts this very simply circuit optimization mode, effectively raises the input impedance of detecting circuit.
Only there be several millivolts beating through the improved capacitance probe detecting circuit of the present invention, compare with the wave detector before not transforming, when carrying out same push pedal experiment, the detecting circuit of transforming the back capacitance probe exchanges variable quantity and can reach about 100mv, the former electric capacity fuze of remolding sensitivity has improved 5-6 doubly, and degree of stability has also improved about 10 times simultaneously.
Description of drawings
Fig. 1 is the capacitance probe theory diagram.
Fig. 2 is capacitance probe circuit diagram before a kind of adjustment.
Fig. 3 is the capacitance probe circuit diagram of the present invention after adjusting.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
The theory diagram of electric capacity fuze detector is made up of pierce circuit, detecting circuit and two coupling electrodes etc. as shown in Figure 1.Pierce circuit is connected with two coupling electrodes respectively one to one with detecting circuit, and two coupling electrodes form the front end transducing part that capacitance variations is surveyed.Pierce circuit produces oscillating voltage to be responded to by coupling electrode, forms voltage in detecting circuit, is called detecting circuit U
dThe circuit form of the amplitude of this detecting circuit and oscillating voltage, electrode position, detecting circuit and component parameter etc. are relevant.
The circuit diagram of a kind of electric capacity fuze detector that the applicant uses at present as shown in Figure 2.Wherein the detection form of detecting circuit is the triode detection circuit, utilizes the PN junction of base-emitter-base bandgap grading of triode Q2 to finish the detection task.Find through using, the oscillating voltage that the detecting circuit of this circuit is come by the coupling electrode induction influences bigger, there be tens millivolts beating in detection post-detection voltage, and the detection sensitivity that changes for small capacitance is lower, this electric capacity fuze detector is when push pedal is tested, sheet metal target for the 1.5m*1.5m of 0.5m place size, detecting circuit after the detection exchanges variable quantity only 20mv, thereby its consequence of bringing is: one comes the height of burst more on the low side, relatively could effectively detect target to nearer distance; Two come the fluctuation of detecting circuit can have influence on the reliability of electric capacity fuze.
For further improving detection sensitivity and the reliability of existing electric capacity fuze, need improve from the stability of detecting circuit itself and to the reaction sensitivity aspect that small capacitance changes.
Find that by analysis detecting circuit sensitivity is low, the reason of poor reliability is that original detecting circuit exists the lower problem of input impedance when utilizing triode detection.So, by adjusting the detecting circuit of original capacitance probe wave detector part, adjust the input impedance of wave detector, reduce oscillator to the influence of wave detector part, thereby than existing capacitance probe, improve the degree of stability of wave detector output detecting circuit and the susceptibility that coupling capacitance is changed greatly, and then improve the overall sensitivity of capacitance probe.
Therefore, the invention provides the electric capacity fuze detector of a kind of high sensitivity and degree of stability, its circuit diagram as shown in Figure 3.Than the electric capacity fuze detection circuit shown in Fig. 2, between the emitter of triode Q2 and detecting circuit output terminal, increased the resistance R 4 that is connected in series, be equivalent to adjust the input impedance of detecting circuit, after increasing this resistance, improve the degree of stability of detecting circuit output detecting circuit and the susceptibility that coupling capacitance is changed greatly, and then improve the overall sensitivity of capacitance probe.Choosing of R4 resistance do not have specific (special) requirements, as long as make the input impedance of grounded emitter circuit and the input impedance of preceding grade coupled level reach matching relationship.
Specifically, the electric capacity fuze detection circuit after the adjustment specifically is made up of pierce circuit, detecting circuit and two coupling electrodes.Pierce circuit is connected with two coupling electrodes respectively one to one with detecting circuit.Detecting circuit comprises resistance R 1～R4, capacitor C 1, diode D1 and triode Q2; The base stage of triode Q2 connects wherein a coupling electrode, connects the negative electrode of diode D1, simultaneously by resistance R 1 ground connection; The collector of triode Q2 connects power Vcc by resistance R 2; Capacitor C 1 and resistance R 3 backs in parallel one end ground connection, the other end connects the anode of diode D1, connects the emitter of triode Q2 simultaneously by resistance R 4; Resistance R 4 is drawn detecting circuit output terminal U with the junction of capacitor C 1
d
Only there be several millivolts beating through the improved capacitance probe detecting circuit of the present invention, when same sheet metal for the 1.5m*1.5m of 0.5m place size carries out the push pedal experiment, detecting circuit after the detection exchanges variable quantity and can reach about 100mv, the former electric capacity fuze of remolding sensitivity has improved 5-6 doubly, and degree of stability has also improved about 10 times simultaneously.
In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. demodulation method that improves electric capacity fuze detection sensitivity and degree of stability, be applicable to that the detection form is the situation of triode detection, it is characterized in that, in the triode detection circuit, between the emitter of triode and detecting circuit output terminal, be connected in series the resistance that is used for improving detecting circuit input impedance.
2. an electric capacity fuze capacitive detection circuits is made up of pierce circuit, detecting circuit and two coupling electrodes, and pierce circuit is connected with two coupling electrodes respectively one to one with detecting circuit; It is characterized in that described detecting circuit comprises resistance R 1～resistance R 4, capacitor C 1, diode D1 and triode Q2;
The base stage of triode Q2 connects wherein the negative electrode of a coupling electrode and diode D1, simultaneously by resistance R 1 ground connection; The collector of triode Q2 connects power Vcc by resistance R 2; Capacitor C 1 and resistance R 3 backs in parallel one end ground connection, the other end connects the anode of diode D1, connects the emitter of triode Q2 simultaneously by resistance R 4; Resistance R 4 is drawn detecting circuit output terminal U with the junction of capacitor C 1
d
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101659810A CN103278697A (en) | 2013-05-08 | 2013-05-08 | Wave detection method for improving detection sensitivity and stability of capacitance fuze and detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101659810A CN103278697A (en) | 2013-05-08 | 2013-05-08 | Wave detection method for improving detection sensitivity and stability of capacitance fuze and detection circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061122A (en) * | 1990-10-25 | 1992-05-13 | 深圳远大通讯公司 | Diode-triode mixture detector |
| JPH0969879A (en) * | 1995-08-30 | 1997-03-11 | Hitachi Ltd | Method for testing insulation resistance/capacitance in subscriber line and subscriber circuit |
| CN102109302A (en) * | 2009-12-24 | 2011-06-29 | 中国船舶重工集团公司第七一○研究所 | Multifunctional composite fuze circuit of fire extinguishing bullet |
| CN203337739U (en) * | 2013-05-08 | 2013-12-11 | 北京理工大学 | Capacitance detection circuit enhancing detection sensitivity and stability and used for capacitance fuse |
-
2013
- 2013-05-08 CN CN2013101659810A patent/CN103278697A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061122A (en) * | 1990-10-25 | 1992-05-13 | 深圳远大通讯公司 | Diode-triode mixture detector |
| JPH0969879A (en) * | 1995-08-30 | 1997-03-11 | Hitachi Ltd | Method for testing insulation resistance/capacitance in subscriber line and subscriber circuit |
| CN102109302A (en) * | 2009-12-24 | 2011-06-29 | 中国船舶重工集团公司第七一○研究所 | Multifunctional composite fuze circuit of fire extinguishing bullet |
| CN203337739U (en) * | 2013-05-08 | 2013-12-11 | 北京理工大学 | Capacitance detection circuit enhancing detection sensitivity and stability and used for capacitance fuse |
Non-Patent Citations (2)
| Title |
|---|
| 佚名: "三极管检波电路", 《互联网》 * |
| 崔占忠等: "电容近炸引信的探测灵敏度", 《兵工学报》 * |
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Application publication date: 20130904 |