| CPC A61B 5/243 (2021.01) [A61B 2562/0223 (2013.01); A61B 2562/046 (2013.01); A61B 2562/166 (2013.01)] | 26 Claims |
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1. A magnetic field measuring apparatus comprising:
an external container;
an internal container storing a liquid refrigerant, disposed inside the external container, and including a neck portion having a first diameter and a body portion having a second diameter greater than the first diameter, wherein a space between the internal container and the external container is maintained in a vacuum state;
a SQUID sensor module mounting plate disposed below the internal container;
a plurality of SQUID sensor modules mounted below the SQUID sensor module mounting plate;
a 4K heat shielding portion formed of a conductive mesh disposed to surround the SQUID sensor module mounting plate and the plurality of SQUID sensor modules;
a main thermal anchor cooled by the refrigerant and disposed on a lower surface of the internal container;
a ring-shaped auxiliary thermal anchor coupled to a side surface of the SQUID sensor module mounting plate with the 4K heat shielding portion interposed therebetween and fixing the 4K heat shielding portion; and
a litz wire connecting and cooling the main thermal anchor and the auxiliary thermal anchor.
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26. A magnetic field measuring apparatus comprising:
an external container; and
an internal container storing a liquid refrigerant and inserted into the external container,
wherein the internal container comprises:
a neck portion into which a baffle insert is inserted; and
a body portion having an increased diameter as compared with the neck portion, and
wherein the neck portion includes an internal cylinder portion and an external cylinder portion disposed to surround the internal cylinder portion,
the internal cylinder portion is separated into auxiliary internal cylinders disposed to be vertically spaced apart from each other, and
thermal anchors are each inserted between the separated auxiliary internal cylinders,
wherein each of the thermal anchors comprises:
a first cylinder portion having a cylindrical shape; and
a first washer portion having a washer shape and connected to an external side of the first cylinder portion from a center of the first cylinder portion,
wherein an external side surface of the first cylinder portion is screw-coupled to an internal side surface of a corresponding auxiliary internal cylinder.
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