Mixed sensor
A sensor and shrinking part technology, applied in instruments, magnetic field measurement using electromagnetic devices, magnetic field measurement using superconducting devices, etc., can solve the problems of difficult low-frequency magnetic field detection, weak magnetic flux detection by gradient coils, and inability to capture the magnetic field to be measured. , to achieve the effect of high magnetic flux and improve transmission efficiency
Inactive Publication Date: 2017-02-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and propose a new hybrid sensor. The hybrid sensor of the present invention combines a superconducting ring and a highly sensitive superconducting gradient coil, which can solve the problem that the gradient coil detects weak magnetic flux and cannot capture the sensor to be tested. Magnetic field, it is difficult to realize the detection of low-frequency magnetic field more efficiently, and realize the detection of low-frequency magnetic field
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[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0018] Such as figure 1 Shown: An embodiment of the sensor of the present invention comprising: a superconducting ring and a superconducting gradient coil. The square loop 7 and the constriction 8 form a superconducting ring, which is used to capture the magnetic flux of the magnetic field to be measured.
[0019] Such as figure 2 As shown, the superconducting ring is composed of at least one square loop 7 and at least one constriction 8 . Use superconducting wires to enclose an area of 1cm 2 A square loop, one of the sides is a constriction with a length of 7um and a width of 2um.
[0020] Such as image 3 As shown, the superconducting gradient ladder coil is a first-order gradient coil wound with superconducting wire, and is composed of a receiving coil 5 and a compensation coil 6. The winding directions of the receiving coil 5 and th...
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The invention provides a mixed sensor. The mixed sensor is composed of a superconducting ring and a superconducting gradient coil. The superconducting ring is a square loop (7) with a retracting part (8); the superconducting ring is composed of the square loop (7) and the retracting part (8); the retracting part (8) is located at one edge of the square loop (7); the retracting part (8) and other three edges of the square loop (7) are located on the same plane; and one edge of the square loop with the retracting part is connected with the other three edges to form the superconducting ring. The superconducting ring is vertically arranged in a magnetic field to be detected; and the superconducting gradient coil is parallel to the retracting part of the superconducting ring and is distributed at one side of the retracting part of the superconducting ring. The superconducting gradient coil is composed of a receiving coil and a compensation coil which are located on the same plane. Each turn of coil of the receiving coil and the compensation coil is wound in the same direction; winding directions of the receiving coil and the compensation coil are opposite; the receiving coil and the compensation coil have the equal diameter and equal number of turns; and the receiving coil and the compensation coil are connected through double stranded wires.
Description
technical field [0001] The invention relates to a hybrid sensor. Background technique [0002] Superconducting quantum interference device (SQUID) has the advantages of high sensitivity and low noise in detecting weak magnetic fields. SQUID has high sensitivity to DC and AC signals, and the sensitivity is almost independent of frequency. It can be applied to biomagnetic measurements. Non-destructive testing, geodesy and other fields. According to the superconducting material used, SQUID can be divided into low-temperature superconducting SQUID and high-temperature superconducting SQUID. Currently the best high temperature SQUID magnetic field sensitivity can reach 10f T / Hz 1 / 2 , while the low temperature SQUID magnetic field sensitivity can generally reach 1f T / Hz 1 / 2 . In the Tesla range, only low-temperature superconducting SQUIDs can measure extremely low signals in a sufficiently low noise range, and high-temperature superconducting SQUIDs are undetectable. The main...
Claims
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Login to View More IPC IPC(8): G01R33/022G01R33/035
CPCG01R33/022G01R33/0358
Inventor 魏欣然张晓东吴秋晨于阳王明
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI