Two-stage superconducting quantum interference device amplification device, method and SQUID magnetic sensor
A technology of superconducting quantum interference and amplifying device, applied in the field of SQUID magnetic sensor amplifying device and double-stage superconducting quantum interfering device amplifying device, can solve problems such as poor working stability, achieve noise suppression, and solve multi-valued working point effect on sex and job stability
Active Publication Date: 2016-12-07
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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[0012] In view of the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a double-stage superconducting quantum interference device amplification device, method and SQUID magnetic sensor, which is used to solve the multi-valued nature of the working point in the existing double-stage SQUID amplification technology , the problem of poor job stability
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[0076] This embodiment provides a two-stage superconducting quantum interference device amplifying device, such as Figure 8a As shown, the dual-stage superconducting quantum interferometer amplification device 800 includes: a modulation module 810, a first-stage superconducting quantum interference device 820, a shaping conversion module 830, and a second SQUID magnetic flux with self-reset and hysteresis transmission characteristics. Voltage conversion module 840, demodulation module 850.
[0077] The modulation module 810 converts a fixed frequency square wave modulation signal into a modulated magnetic flux. A specific implementation manner is to generate a square wave modulation signal with a fixed frequency, convert the square wave modulation signal into a modulation current, and convert the modulation current into a modulation magnetic flux. The frequency of the square wave modulation signal can be determined according to the actual circuit response capability, such as 1k~...
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The invention provides a two-stage superconducting quantum interference device amplification device, a method and an SQUID magnetic sensor. The amplification device comprises a modulation module which converts a square wave modulation signal of fixed frequency into modulation magnetic flux, a first-stage superconducting quantum interference device which detects an external magnetic flux signal to acquire measured magnetic flux, and at the same time modulates the voltage output of the measured magnetic flux into a modulated voltage signal through coupled modulation magnetic flux, a shaping conversion module which converts and shapes the modulated voltage signal to output an adjustment magnetic flux signal, a second SQUID magnetic flux-voltage conversion module with self-resetting and transmission characteristic hysteresis, and a demodulation module. The second SQUID magnetic flux-voltage conversion module comprises a second-stage superconducting quantum interference device which is coupled to the shaping conversion module, responds to the adjustment magnetic flux signal, and outputs an adjustment voltage signal corresponding to the amplification. The demodulation module uses the square wave modulation signal to demodulate the adjustment voltage signal, and outputs a two-stage amplified detection voltage signal corresponding to the measured magnetic flux. According to the invention, the problems of work point multi valuedness and work stability of a two-stage SQUID amplification technology are solved.
Description
Technical field [0001] The invention belongs to the technical field of magnetic sensors, and relates to an amplifying device for a SQUID magnetic sensor, in particular to a dual-stage superconducting quantum interferometer amplifying device and method, and a SQUID magnetic sensor. Background technique [0002] Magnetic sensors based on Superconducting Quantum Interference Device (SQUID) are the most sensitive magnetic detectors currently known, and are widely used in the detection of weak magnetic fields such as biological magnetic fields, earth magnetic field anomalies, and extremely low field nuclear magnetic resonance. Field, its detection sensitivity has reached Feite (10 -15 Tesla). SQUID magnetic sensor is an important magnetic sensor device in extreme detection and scientific research, and has high scientific research and application value. [0003] The SQUID device is the core magnetic sensor in the SQUID magnetic sensor. Usually a DC SQUID device (the SQUID mentioned bel...
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Inventor 王永良徐小峰孔祥燕谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI