Dewar flask for hyperthermia superconducting magnetic detection

Abstract

The invention aims to provide a Dewar bottle used in high-temperature superconductor magnetic detection. The Dewar bottle comprises an insulation layer, a vacuum layer and a Dewar layer, and is characterized in that: one wall of the Dewar bottle is provided with a shielding film consisting of conductive material through vapor deposition; in addition, different walls of the Dewar bottle are respectively provided with a shielding film consisting of conductive material through vapor deposition; moreover, different walls can be provided with different or identical conductive material through vapor deposition. The invention has the advantages that: magnetic shielding effect is obviously improved along with stable operation of magnetic detection and stable signal; the coated Dewar bottle can complete normal magnetic detection in a laboratory without a shielding chamber, thereby reducing cost and workload; moreover, the invention gives an enormous impetus to the industrialization of high-temperature superconductor magnetic detecting devices.

Description

technical field [0001] The invention relates to a Dewar for magnetic detection, in particular to a Dewar for magnetic detection used in high-temperature superconducting magnetocardiographs, multi-channel new magnetographs, high-temperature superconducting geomagnetic measurements, high-temperature superconducting SQUID weak magnetic signal detection, etc. bottle. Background technique [0002] With the continuous update of superconducting materials and the increasingly sophisticated processing technology of microelectronic devices, high-temperature superconducting SQUID magnetic detection sensors with higher sensitivity and wider bandwidth have been manufactured, which broadens our research on the field of magnetic signals, but in The space around us is full of strong electromagnetic signals, such as high-voltage lines, substations, radio stations, television stations, radar stations, electromagnetic wave transmission towers and electronic instruments, medical equipment, offi...

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Problems solved by technology

[0004] Status: We are now using high-temperature superconducting SQUID magnetic signal detection. One situation is to conduct magnetic detection test research in the laboratory without shielding or in the field in a natural environment. The Dewar bottle is in direct contact with the real environment, and electromagnetic interference Many, the magnetic field environment changes greatly, which seriously affects the normal operation of the high-temperature superconducting SQUID. The second case is that the Dewar bottle is not equipped with a magnetic shielding device in a professional magnetic shielding room. In this case, the magnetic signal The detection has a relatively good improvement, but the cost of an ordinary magnetic shielding room is very expensive, and after the magnetic shielding room is built, it is not easy to move. If we change the environment or conduct magnetic detection tests in the field, it is still To use a Dewar bottle without a magnetic shielding device does not solve the problem of electromagnetic interference; the third situation is what we often use now, wrapping the Dewar bottle with aluminum foil with good conductivity. This method is relatively simple. However, it is not easy to wrap it with a film, it is easy to be damaged, and it is easy to connect badly at the film interface, so the shielding efficiency of the magnetically shielded Dewar bottle wrapped in this way is relatively low, and even the shielding effect cannot be achieved, and it is easy to wear during use; use The simple wrapped Dewar is used in a magnetic shielding room, the effect will be better, but some practical problems still cannot be solved

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