CN103312370A - Inhibition device and inhibition method of ringing trailing signal of drug detector - Google Patents
Inhibition device and inhibition method of ringing trailing signal of drug detector Download PDFInfo
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- CN103312370A CN103312370A CN2012100619050A CN201210061905A CN103312370A CN 103312370 A CN103312370 A CN 103312370A CN 2012100619050 A CN2012100619050 A CN 2012100619050A CN 201210061905 A CN201210061905 A CN 201210061905A CN 103312370 A CN103312370 A CN 103312370A
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- circuit module
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- ringing
- control switch
- transmitter
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Abstract
The invention relates to a trailing signal inhibition device and an inhibition method, and especially relates to an inhibition device and an inhibition method of a ringing trailing signal of a drug detector. The inhibition device comprises a transmitter and an antenna and is characterized in that: one end of an elimination ringing circuit module is connected with a wire connecting the transmitter and the antenna; and the other end of the elimination ringing circuit module is grounded. The elimination ringing circuit module is made in the following manner: one end of an impedance load is grounded and the other end of the impedance load is connected with one end of a control switch; the other end of the control switch is connected with one end of an impedance conversion circuit module; and the other end of the impedance conversion circuit module is connected with the wire connecting the transmitter and the antenna. The inhibition device and inhibition method of the invention have the following advantages: the one elimination ringing circuit module is added to immediately change the discharging loop and reduce the discharging time constant from the moment when the transmission pulse ends; energy in the antenna is released quickly; and the effect of the ringing on the echo signal is reduced.
Description
Technical field
The present invention relates to a kind of hangover signal suppressing device and inhibition method, relate in particular to a kind of drug detecting instrument ring hangover signal suppressing device and inhibition method, belong to illicit drugs inspection instrument field; Behind the high-power transmitter transmitted pulse, to make antenna discharge rapidly the energy of storage and change rapidly accepting state restraining device and inhibition method in a kind of illicit drugs inspection instrument emitting-receiving system of transmit-receive sharing.
Background technology
Transmitter and receiver is time-sharing work in the drug detecting instrument, finishes when transmitted pulse one in theory, and receiver just should get started reception, and the echo-signal that receives of receiver is the strongest like this.And in fact after driving pulse emission stops, because inductance characteristic and the Q value of antenna are very high, this just makes the energy that stores in the antenna not discharge at once, but slowly disappearance in the certain hour that continues.After transmitted pulse stopped, still delay transmitted in one section duration internal antenna, owing to bell signal floods echo-signal fully, thereby the receiver state of reaching capacity can't normally be received.Can therefore how to eliminate the bell signal in the detectable signal, be the key technology that determines realize illicit drugs inspection.
Summary of the invention
In order to solve the problems of the technologies described above a kind of drug detecting instrument ring hangover signal suppressing device and the inhibition method of the invention provides, purpose is to change at once discharge loop and reduce discharge time constant from transmitted pulse finish time, energy in the antenna is discharged as early as possible, thereby reduce the ring effect to the impact of echo-signal.
For reaching a kind of drug detecting instrument ring of above-mentioned purpose the present invention hangover signal suppressing device, comprise transmitter and antenna, between transmitter and antenna, is connected the other end ground connection of elimination ringing circuit module with an end of eliminating the ringing circuit module; Eliminating the ringing circuit module is made of following structure: an end ground connection of impedance load, the other end of impedance load is connected with an end of control switch, the other end of control switch is connected with the impedance inverter circuit module, and the impedance inverter circuit module other end is connected between transmitter and the antenna.
Described control switch is that the Darlington multiple tube consists of Q switching.
The equivalence of impedance inverter circuit module is 1/2nd wavelength transmission lines.
The inhibition method of a kind of drug detecting instrument ring hangover signal suppressing device, it is characterized in that control switch during the transmitter transmitted pulse for disconnecting, behind the end-of-pulsing control switch at once controlled closure until control finishes to return to normality.
Advantageous effect of the present invention: increase an elimination ringing circuit module, effect is exactly to change at once discharge loop and to reduce discharge time constant from transmitted pulse finish time, energy in the antenna is discharged as early as possible, thereby reduce the ring effect to the impact of echo-signal.
Description of drawings
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is the operating time figure of control switch of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
A kind of drug detecting instrument ring hangover signal suppressing device comprises transmitter 1 and antenna 2, is connected the other end ground connection of elimination ringing circuit module 3 with an end of eliminating ringing circuit module 3 between transmitter 1 and antenna 2; Eliminating ringing circuit module 3 is made of following structure: an end ground connection of impedance load 4, the other end of impedance load 4 is connected with an end of control switch 5, the other end of control switch 5 is connected with impedance inverter circuit module 6, and impedance inverter circuit module 6 other ends are connected between transmitter 1 and the antenna 2.
Control switch 5 consists of Q switching for the Darlington multiple tube; The equivalence of impedance inverter circuit module is 1/2nd wavelength transmission lines.
The inhibition method of a kind of drug detecting instrument ring hangover signal suppressing device, control switch 5 during transmitter 1 transmitted pulse for disconnecting, behind the end-of-pulsing control switch 5 at once controlled closure until control finishes to return to normality.
The characteristic that presents impedance when opening a way according to the Ideal Transmission Line terminal at input:
Z
in(x)＝-jZ
0ctan(βx)
Z wherein
0Be transmission line characteristic impedance, β=2 π/λ, the starting point O of x coordinate are transmission-wire terminal, are coordinate direction towards transmission line input direction.When x=λ/2, β x=π is Z then
In(x)=and ∞, namely terminal is opened a way, and the impedance that input presents is infinitely great (open circuit).On the other hand, original antenna circuit has very high Q value, and the signal of launching and receive is become resonance condition (impedance is approximately 0), and the duration of transmitted pulse, this impedance inverter circuit does not consist of impact substantially concerning former emission and receiving circuit.And work as transmitted pulse from t
0To t
1During emission, control switch is not worked, control switch was closed at once when the transmitter transmitted pulse finished, the discharge loop of antenna changes into by this impedance transformation road module discharge like this, because another termination impedance load of switch, be the traveling wave state at transmission line like this, the energy on the antenna just discharges fast by this loop, thereby has shortened the duration of pulse ringing.
Claims (4)
1. drug detecting instrument ring hangover signal suppressing device comprises transmitter and antenna, it is characterized in that being connected the other end ground connection of elimination ringing circuit module with an end of eliminating the ringing circuit module between transmitter and antenna; Eliminating the ringing circuit module is made of following structure: an end ground connection of impedance load, the other end of impedance load is connected with an end of control switch, the other end of control switch is connected with the impedance inverter circuit module, and the impedance inverter circuit module other end is connected between transmitter and the antenna.
2. a kind of drug detecting instrument ring hangover signal suppressing device according to claim 1 is characterized in that described control switch is that the Darlington multiple tube consists of Q switching.
3. a kind of drug detecting instrument ring hangover signal suppressing device according to claim 1 is characterized in that the equivalence of impedance inverter circuit module is 1/2nd wavelength transmission lines.
4. with the inhibition method of a kind of drug detecting instrument ring hangover signal suppressing device claimed in claim 1, it is characterized in that control switch during the transmitter transmitted pulse for disconnecting, behind the end-of-pulsing control switch at once controlled closure until control finishes to return to normality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100619050A CN103312370A (en) | 2012-03-09 | 2012-03-09 | Inhibition device and inhibition method of ringing trailing signal of drug detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100619050A CN103312370A (en) | 2012-03-09 | 2012-03-09 | Inhibition device and inhibition method of ringing trailing signal of drug detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103312370A true CN103312370A (en) | 2013-09-18 |
Family
ID=49137208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100619050A Pending CN103312370A (en) | 2012-03-09 | 2012-03-09 | Inhibition device and inhibition method of ringing trailing signal of drug detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103312370A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109417519A (en) * | 2016-06-22 | 2019-03-01 | 株式会社电装 | Ring suppression circuit |
| CN109479038A (en) * | 2016-07-29 | 2019-03-15 | 株式会社电装 | Ring suppression circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101155286A (en) * | 2007-08-31 | 2008-04-02 | 康佳集团股份有限公司 | I2S ringing wipe circuit |
-
2012
- 2012-03-09 CN CN2012100619050A patent/CN103312370A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101155286A (en) * | 2007-08-31 | 2008-04-02 | 康佳集团股份有限公司 | I2S ringing wipe circuit |
Non-Patent Citations (1)
| Title |
|---|
| 周新建等: "NQR探测系统振铃拖尾抑制方法研究", 《核电子学与探测技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109417519A (en) * | 2016-06-22 | 2019-03-01 | 株式会社电装 | Ring suppression circuit |
| CN109479038A (en) * | 2016-07-29 | 2019-03-15 | 株式会社电装 | Ring suppression circuit |
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Application publication date: 20130918 |