High temperature superconducting magnetic field weakening measurement sensor

Abstract

The invention relates to a high-temperature superconductivity weak magnetic measuring transducer. The high-temperature superconductivity weak magnetic measuring transducer provided by the invention comprises a high-temperature superconductivity device and a phase-locked closed-loop circuit, wherein the phase-locked closed-loop circuit comprises a directional coupler, a high-frequency amplifier, amixer, a low-frequency amplifier, a high-frequency oscillator, a radio frequency signal attenuator, an integrator and a feedback Circuit, wherein the output of the high-temperature superconductivity device is transmitted 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, wherein one path is connected with the input of the mixer and the other path is connected with the directional coupler after being attenuated by the radio frequency signal attenuator; and the output of the integrator is fed back to the directional coupler through the feedback circuit. The high-temperature superconductivity weak magnetic measuring transducer provided by the invention has the advantages of high slew rate, low noise, high sensitivity, high stability and high interference resistance and meets the requirements for measuring a weak magnetic field by utilizing a geophysical electromagnetic method.

Description

technical field [0001] The invention relates to a high-temperature superconducting weak magnetic measurement sensor, which belongs to the field of high-temperature superconducting technology applied to geophysical measurement of weak magnetic signals. Background technique [0002] In the early 1980s, low-temperature superconducting magnetometers used for magnetotelluric sounding used low-temperature superconducting technology. The superconducting elements in this low-temperature superconducting magnetometer must work at an absolute temperature of 4K. To provide this temperature condition, liquid helium is used. However, liquid helium resources are scarce and expensive in nature, and low-temperature technology is complicated, so it cannot be widely used. The successful development of high-temperature superconducting materials has greatly increased the operating temperature of superconducting components. The yttrium-barium-copper-oxygen superconducting material only needs an...

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Problems solved by technology

Therefore, the signal-to-noise ratio of low-frequency signals measured by the traditional induction coil method is low.

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