CN202204940U - High temperature superconducting low-intensity magnetic measuring transducer - Google Patents
High temperature superconducting low-intensity magnetic measuring transducer Download PDFInfo
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- CN202204940U CN202204940U CN2011202969613U CN201120296961U CN202204940U CN 202204940 U CN202204940 U CN 202204940U CN 2011202969613 U CN2011202969613 U CN 2011202969613U CN 201120296961 U CN201120296961 U CN 201120296961U CN 202204940 U CN202204940 U CN 202204940U
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Abstract
A high temperature superconducting low-intensity magnetic measuring transducer comprises a high temperature superconducting part and a phase lock closed-loop circuit, wherein the phase lock closed-loop circuit consists of a directional coupler, a high frequency amplifier, a mixer, a low frequency amplifier, a high frequency oscillator, a radio frequency attenuator, an integrator and a feedback circuit, wherein the output of the high temperature superconducting part is sent to the high frequency amplifier through the directional coupler; the high frequency amplifier, the mixer, the low frequency amplifier and the integrator are sequentially connected in series; the output of the high frequency oscillator is divided into two paths; one path is connected with the input of the mixer, and the other one is connected with the directional coupler after being attenuated by the radio frequency attenuator; and the output of the integrator is fed back to the directional coupler through the feedback circuit. The high temperature superconducting low-intensity magnetic measuring transducer is high in slew rate, low in noise and high in sensitivity, stability and anti-jamming capability, thereby meeting the requirements on measurement of a weak magnetic field by a geophysical electromagnetic technique.
Description
Technical field
The utility model relates to a kind of high-temperature superconductor weak magnetic survey sensor, belongs to high temperature superconductor technology and is applied to geophysical survey weak magnetic signal field.
Background technology
The early 1980s, the low-temperature superconducting magnetometer that is used for telluric electromagnetic sounding uses the low-temperature superconducting technology, and the superconducting component in this low-temperature superconducting magnetometer must be worked under absolute temperature 4K.For this temperature conditions is provided, used liquid helium.And the liquid helium resource is deficient and expensive at nature, and cryogenic technique is complicated, can not generally use.Succeeding in developing of high temperature superconducting materia makes the superconducting component working temperature improve greatly.Yttrium barium copper oxygen superconductive material only needs absolute temperature 77K just can work.And this temperature just can realize with liquid nitrogen.Nitrogen is very abundant in the nature resource, and 78% is nitrogen in the air, and the manufacturing conditions of liquid nitrogen is easy to realize, and is cheap for manufacturing cost, hundreds of/one of liquid helium price just, and it is widely used.
In the geophysics electromagnetic method, traditional measurement magnetic field is as surveying Magnetic Sensor with inductive coil.Because the sensitivity of inductive coil changes with the frequency that receives signal, and is very low in low-frequency range sensitivity, and low-frequency range reflects the information of deep Earth exactly.Therefore heritage answers the low frequency signal signal to noise ratio (S/N ratio) of coil method measurement low.And high-temperature superconductor weak magnetic survey sensor with high temperature superconducting quantum interfering device as magnetic field strength transducer, very responsive to magnetic field, its highly sensitive and bandwidth, constant at each segment sensitive degree, LF-response is good.In geophysics electromagnetic method weak magnetic signal is measured, can improve the signal to noise ratio (S/N ratio) of low frequency signal, make measurement more accurate, improve depth of exploration.
The utility model content
In view of above-mentioned background, the purpose of the utility model provides a kind of high-temperature superconductor weak magnetic survey sensor that in the geophysics electromagnetic method, uses.This sensor has high pendulum rate, low noise, high sensitivity, high stability, high anti-jamming capacity.Satisfy the needs that are used for geophysical electricity magnetic survey Weak magentic-field.
For achieving the above object, the utility model adopts following technical scheme:
A kind of high-temperature superconductor weak magnetic survey sensor comprises high-temperature superconductive device and phase-locked closed-loop circuit, and high-temperature superconductive device is delivered to the phase-locked closed-loop circuit as receiving by the sensor of measuring magnetic field with the external magnetic field signal that receives, and it is characterized in that:
The phase-locked closed-loop circuit is by directional coupler, radio-frequency amplifier, frequency mixer, low-frequency amplifier, high frequency oscillator, radiofrequency signal attenuator, and integrator, feedback circuit are formed, wherein:
The output of high-temperature superconductive device is delivered to radio-frequency amplifier through directional coupler;
Radio-frequency amplifier, frequency mixer, low-frequency amplifier, integrator are connected in series successively;
The output of high frequency oscillator is divided into two-way, and one the tunnel connects the input of frequency mixer, and another road connects directional coupler after the decay of radiofrequency signal attenuator;
The output of integrator feeds back to directional coupler through feedback circuit.
Further:
High-temperature superconductive device adopts the high-temperature superconductor radio frequency quantum interfering device of band coplanar resonator, in whole phase-locked closed-loop circuit, uses as the nulling device.
The offset signal frequency of high-temperature superconductor radio frequency quantum interfering device be 0.3GHz to 1GHz, and use the frequency conversion mode to join humorous.
Radio-frequency amplifier is by being formed by the cascade of three grades of radio-frequency amplifier AC coupling.
The radiofrequency signal attenuator is combined by fixed attenuator and adjustable attenuator and forms.
Adopt the coaxial shielding cable to be connected between high-temperature superconductor radio frequency quantum interfering device and the radio-frequency amplifier; Directional coupler, radio-frequency amplifier, frequency mixer are contained in the magnetic shielding box, all add shielding box between high frequency oscillator, radiofrequency signal attenuator, radio-frequency amplifier at different levels.
The phase-locked closed-loop circuit production is on double-sided circuit galley, and each components and parts, lines and solder joint are placed on the same one side of double-sided circuit galley, and another side all keeps as big face ground.
The beneficial effect of the utility model is:
Have high pendulum rate, low noise, high sensitivity, high stability, high anti-jamming capacity, satisfy the needs that are used for geophysical electricity magnetic survey Weak magentic-field.
Description of drawings
Fig. 1 is the theory diagram of high-temperature superconductor magnetometer;
Fig. 2 is a radiofrequency signal attenuator schematic diagram;
Fig. 3 is the schematic diagram of radio-frequency amplifier;
Fig. 4 is the low-frequency channel schematic diagram.
Embodiment
The utility model provides a kind of high-temperature superconductor weak magnetic survey sensor, comprises high-temperature superconductive device shown in Figure 1 and phase-locked closed-loop circuit, and high-temperature superconductive device is delivered to the phase-locked closed-loop circuit as receiving by the sensor of measuring magnetic field with the external magnetic field signal that receives.
This phase-locked closed-loop circuit is by directional coupler, radio-frequency amplifier, frequency mixer, low-frequency amplifier, high frequency oscillator, radiofrequency signal attenuator, and integrator, feedback circuit are formed.Wherein: the output of high-temperature superconductive device is delivered to radio-frequency amplifier through directional coupler; Radio-frequency amplifier, frequency mixer, low-frequency amplifier, integrator are connected in series successively; The output of high frequency oscillator is divided into two-way, and one the tunnel connects the input of frequency mixer, and another road connects directional coupler after the decay of radiofrequency signal attenuator; The output of integrator feeds back to directional coupler through feedback circuit.
High-temperature superconductive device adopts the high-temperature superconductor radio frequency quantum interfering device of band coplanar resonator as the sensor probe of measuring magnetic field, in whole phase-locked closed-loop circuit, uses as the nulling device.The offset signal frequency of high-temperature superconductor radio frequency quantum interfering device be 0.3GHz to 1GHz, and use the frequency conversion mode to join humorous.Relation according to the voltage modulated degree of depth and magnetic flux sensitivity is selected suitable carrier frequency to superconducting quantum interference device.Be generally more than the 100MHz, select carrier current frequency to be: 0.3GHz is to 1GHz.
For isolating the radiofrequency signal of uplink and downlink, lead between quantum interfering device and the radio-frequency amplifier in the high temperature ultra radio frequency and use directional coupler.
For the output power that makes the radiofrequency signal oscillator adapts to the requirement of different high-temperature superconductor radio frequency quantum interfering devices to signal, use a fixing attenuator and an adjustable attenuator combination, as the radiofrequency signal attenuator.Make it can guarantee attenuation amplitude, can guarantee adjustable variation range again.
Radio-frequency amplifier is by being formed by the cascade of three grades of radio-frequency amplifier AC coupling.
Be the raising detection efficiency, and the detecting signal phase place, reduce radio-frequency amplifier gain requirement, use double balanced mixer to the modulation signal demodulator.
Supply with the rf bias signal of high-temperature superconductor radio frequency quantum interfering device and the high-frequency local oscillation signal of frequency mixer and use same radiofrequency signal oscillator as oscillation source, and synchronously.Oscillation source adopts voltage controlled oscillator, adjusts its voltage and obtains different frequency, leads the work of quantum interfering device device to adapt to different high temperature ultra radio frequencies.
Adopt low noise, wide band operational amplifier as low-frequency amplifier.With the high-frequency signal after the mixing of integrator elimination frequency mixer.
The phase-locked closed-loop circuit production is considered the specific inductive capacity of printed circuit board material on double-sided circuit galley, the distributed capacitance between high-frequency loss and printed wiring selects for use the two-sided copper clad plate of PVF as high-frequency circuit galley.Its copper thickness is 35 μ m, and insulation thickness 0.93mm, specific inductive capacity are 2.7.For reducing line impedance, prevent the coupling noise between principal vertical line, adopt big plane ground connection: each components and parts, lines and the solder joint in the circuit is placed on one side; And another side all keeps as big face ground.
The shielding measure of strictness below the utility model adopts:
Forming the high frequency prime amplifier of high-temperature superconductor magnetometer by directional coupler, radio-frequency amplifier, frequency mixer, is a broadband, high-gain, low noise, small-signal radio-frequency amplifier.They are arranged at apart from the nearer position of superconduction probe as independent parts.
The high temperature ultra radio frequency is led and is adopted 50 Ω coaxial shielding cables to be connected between quantum interfering device and the high frequency prime amplifier; Whole high frequency preamplifier circuit is shielded in the special aluminium alloy shield assembly, this device no any slit except that lid.For avoiding crosstalking between the high frequency prime amplifier each several part, the oscillator of high-frequency circuit all adds shielding box between attenuator, radio-frequency amplifier at different levels.
Use directional coupler.In order to isolate the radiofrequency signal of uplink and downlink.The resonant tank that only uses a cable that the high temperature ultra radio frequency is led in the quantum interfering device is connected with the high frequency prime amplifier; Realization is injected into radiofrequency signal with the high temperature ultra radio frequency and leads in the resonant tank of quantum interfering device coupling, is transferred to external magnetic field signal modulated in this resonant tank in the high frequency prime amplifier simultaneously.An end that indicates RFIN links to each other with the resonant tank that the high temperature ultra radio frequency is led quantum interfering device, and an end that indicates RFOUT links to each other with radio-frequency amplifier, and an end that indicates CPL links to each other with radio-frequency signal source.
The utility model system design is used for being fit to field test.The high temperature ultra radio frequency is led quantum interfering device and is placed in a non-magnet material and the low temperature resistant shaft-like probe; This probe placement is in being equipped with the special no magnetic Dewar of liquid nitrogen during work, and the high frequency prime amplifier is arranged at apart from the nearer position of superconduction probe as independent parts.All the other electronic circuits of system constitute the main frame of instrument, various plugs, switch, adjustment knob are installed on the instrument panel, reach indicating gauge and pilot lamp.
The principle of work of the utility model high-temperature superconductor weak magnetic survey sensor: when external magnetic field changes through superconducting ring; Be added to high temperature superconducting quantum interfering device coupling resonance loop on high-frequency signal modulated; Modulated signal is sent into frequency mixer detection demodulation, behind the integrator integration after radio-frequency amplifier amplifies; Obtain a magnitude of voltage with the proportional relation of flux change amount; This magnitude of voltage feeds back to after through the conversion of feedback circuit voltage-to-current on the coil with the superconducting ring coupling, in superconducting ring, produce one with outer flux change amount equal and opposite in direction, magnetic flux in the opposite direction, it is zero making the interior flux change of superconducting ring like this.This magnitude of voltage of integrator output has just reacted the size through the flux change amount of superconducting ring, and the area of superconducting ring is known, just can correspondence obtain magnetic field value.
Following introductory section element circuit.
Like Fig. 2, voltage controlled oscillator POS1025 output signal is through GSE fixed attenuator decay 20dB, the circuit decay of forming through R5 and R6, the adjustable attenuator through forming again by diode D1 and D2, make the POS1025 attenuated output signal arrive-more than the 70dBm.And receive the end that indicates CPL of directional coupler to this signal, this signal is injected in the superconducting quantum interference device.The signal of voltage controlled oscillator POS1025 output is simultaneously also directly received the local oscillator end of frequency mixer.
Use double balanced mixer TFM-2, frequency of operation DC-1000MHz, local oscillator excitation level 7dBm, the gain of radio-frequency amplifier is greater than 45dB.
Like Fig. 3, radio-frequency amplifier is three grades of amplifications.The triode that first order A1 adopts is the BFT66 that Siemens Company produces, and is operated in the common emitter state, changes quiescent point through the resistance that changes base stage, to obtain high-gain, low noise.Second level A2 adopts the MAR-6 fixed gain amplifier.Third level A3 adopts the high isolation of RF-2301, fixed gain isolated amplifier, isolates frequency mixer local oscillation signal crosstalking along the amplifier forward end.Three grades of about 55dB of full gain; The about 500MHz of bandwidth, the noise that is folded to input end is less than
When the high temperature superconducting quantum interfering device superconducting ring is passed through in magnetic field; The high-frequency signal that is added on the superconducting ring is modulated; Modulated high-frequency signal is added to signal through the output terminal of directional coupler the first order of radio-frequency amplifier; Process first order amplifying signal passes through the amplification of second, third grade again, and amplifying signal is added to the input end of frequency mixer, carries out synchronous detection with voltage controlled oscillator POS1025 output signal here.The low frequency signal of frequency mixer output is sent into low-frequency channel.
Select for use low noise, wide band operational amplifier op07 to amplify as low frequency; Integrator is selected suitable integration constant (900s).Like Fig. 4, low-frequency channel comprises two-stage amplifier and one-level integrator.A4 and R13, R14, R15 form first order low-frequency amplifier; A5 and R16, R17, R19, R20, R21, R22 form second level low-frequency amplifier, and R19, R20, R21 can adjust the DC level of signal; A6 and R23, R24, C13 form integrator.
Send into the signal of low-frequency channel, amplify through two-stage, again after the integrator integration; The A7 of leading up to output, the one tunnel sends into the feedback circuit of being made up of A9, and the output voltage signal behind A9 one to one reverse the amplification feeds back to the input end of high-temperature superconductive device; This voltage signal by the coil in the high-temperature superconductive device convert to one with external magnetic field equal and opposite in direction, magnetic field in the opposite direction; Counteracting is through the magnetic field of superconducting ring, and this feedback quantity is exactly the output of integrator, has represented the size in magnetic field.
A8 is a triangular wave oscillator, the triangular wave of output 200Hz.This signal injects a known field signal when debugging high temperature superconducting quantum interfering device duty.
The above embodiments do not constitute any type of restriction to the desired protection domain of the utility model; Claims of the utility model have covered all modifications and change; Therefore, making various modifications to the foregoing description all belongs in the protection domain of the utility model with changing.
Claims (7)
1. a high-temperature superconductor weak magnetic survey sensor comprises high-temperature superconductive device and phase-locked closed-loop circuit, and high-temperature superconductive device is delivered to the phase-locked closed-loop circuit as receiving by the sensor of measuring magnetic field with the external magnetic field signal that receives, and it is characterized in that:
The phase-locked closed-loop circuit is by directional coupler, radio-frequency amplifier, frequency mixer, low-frequency amplifier, high frequency oscillator, radiofrequency signal attenuator, and integrator, feedback circuit are formed, wherein:
The output of high-temperature superconductive device is delivered to radio-frequency amplifier through directional coupler;
Radio-frequency amplifier, frequency mixer, low-frequency amplifier, integrator are connected in series successively;
The output of high frequency oscillator is divided into two-way, and one the tunnel connects the input of frequency mixer, and another road connects directional coupler after the decay of radiofrequency signal attenuator;
The output of integrator feeds back to directional coupler through feedback circuit.
2. high-temperature superconductor weak magnetic survey sensor as claimed in claim 1 is characterized in that:
High-temperature superconductive device adopts the high-temperature superconductor radio frequency quantum interfering device of band coplanar resonator, in whole phase-locked closed-loop circuit, uses as the nulling device.
3. high-temperature superconductor weak magnetic survey sensor as claimed in claim 2 is characterized in that:
The offset signal frequency of high-temperature superconductor radio frequency quantum interfering device be 0.3GHz to 1GHz, and use the frequency conversion mode to join humorous.
4. like the described high-temperature superconductor weak magnetic survey of one of claim 1-3 sensor, it is characterized in that:
Radio-frequency amplifier is by being formed by the cascade of three grades of radio-frequency amplifier AC coupling.
5. like the described high-temperature superconductor weak magnetic survey of one of claim 1-3 sensor, it is characterized in that:
The radiofrequency signal attenuator is combined by fixed attenuator and adjustable attenuator and forms.
6. like the described high-temperature superconductor weak magnetic survey of one of claim 1-3 sensor, it is characterized in that:
Adopt the coaxial shielding cable to be connected between high-temperature superconductor radio frequency quantum interfering device and the radio-frequency amplifier; Directional coupler, radio-frequency amplifier, frequency mixer are contained in the magnetic shielding box, all add shielding box between high frequency oscillator, radiofrequency signal attenuator, radio-frequency amplifier at different levels.
7. high-temperature superconductor weak magnetic survey sensor as claimed in claim 6 is characterized in that:
The phase-locked closed-loop circuit production is on double-sided circuit galley, and each components and parts, lines and solder joint are placed on the same one side of double-sided circuit galley, and another side all keeps as big face ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202969613U CN202204940U (en) | 2011-08-16 | 2011-08-16 | High temperature superconducting low-intensity magnetic measuring transducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202969613U CN202204940U (en) | 2011-08-16 | 2011-08-16 | High temperature superconducting low-intensity magnetic measuring transducer |
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| Publication Number | Publication Date |
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| CN202204940U true CN202204940U (en) | 2012-04-25 |
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| CN2011202969613U Expired - Lifetime CN202204940U (en) | 2011-08-16 | 2011-08-16 | High temperature superconducting low-intensity magnetic measuring transducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288999A (en) * | 2011-08-16 | 2011-12-21 | 中国地质科学院地球物理地球化学勘查研究所 | High-temperature superconductivity weak magnetic measuring transducer |
-
2011
- 2011-08-16 CN CN2011202969613U patent/CN202204940U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288999A (en) * | 2011-08-16 | 2011-12-21 | 中国地质科学院地球物理地球化学勘查研究所 | High-temperature superconductivity weak magnetic measuring transducer |
| CN102288999B (en) * | 2011-08-16 | 2013-05-15 | 中国地质科学院地球物理地球化学勘查研究所 | High-temperature superconductivity weak magnetic measuring transducer |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120425 Effective date of abandoning: 20130515 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20120425 Effective date of abandoning: 20130515 |
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| RGAV | Abandon patent right to avoid regrant |