Wire member and method of fabricating same

• US 20030111257A1
• Filed: 11/01/2002
• Published: 06/19/2003
• Est. Priority Date: 11/05/2001
• Status: Active Grant

• Current Assignee: Jeol Resonance Inc. (JEOL Limited)
• Original Assignee: JEOL Limited
• Inventors: Tanaka, Ryoji, Kida, Jun
• Granted Patent: US 7,049,505 B2
• Time in Patent Office: Days
• US Class Current: 174/128.1
• CPC Class Codes: G01R 33/34007 Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
• CPC Class Codes: G01R 33/46 NMR spectroscopy
• CPC Class Codes: Y10T 29/49004 including measuring or testing of device or component part
• CPC Class Codes: Y10T 29/49075 including permanent magnet or core
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing
• CPC Class Codes: Y10T 29/49169 Assembling electrical component directly to terminal or elongated conductor
• CPC Class Codes: Y10T 29/49194 Assembling elongated conductors, e.g., splicing, etc.

Abstract

A wire member adapted to be used in a detection coil of an NMR spectrometer'"'"'s probe. The wire member comprises a sleeve made of a copper tube having a high electrical conductivity, strands made of platinum, and a thin film of gold or rhodium formed on the surface of the sleeve by plating. The strands are mounted inside the sleeve and have a cross section to cancel the magnetic susceptibility due to the sleeve. The thin film cancels the total magnetic susceptibility of the sleeve and strands.

Claims

1. A wire member for use in a detection coil that detects an NMR (nuclear magnetic resonance) signal from a sample, said wire member comprising:

at least one first wire component made of a first metal having a high electrical conductivity;

at least one second wire component made of a second metal having a magnetic susceptibility opposite in sign to magnetic susceptibility of said first wire component, said second wire component being disposed close and parallel to said first wire component; and

a thin film made of a third metal formed on at least one surface of said first and second wire components, said third metal having a magnetic susceptibility opposite in sign to a total magnetic susceptibility of said first and second wire components.

2. The wire member of claim 1, wherein said first wire component has a tubular shape and holds said second wire component therein, and wherein said thin film is formed on a surface of said first wire component.

3. The wire member of claim 1, wherein said first metal is copper, said second metal is platinum, and said third metal is one of platinum and rhodium.

4. The wire member of claim 1, wherein said first metal has a diamagnetic susceptibility, said second metal has a paramagnetic susceptibility, and said third metal has one of a diamagnetic susceptibility and a paramagnetic susceptibility.

5. A method of fabricating a wire member for use in a detection coil that detects an NMR signal from a sample, said method comprising the steps of:

preparing at least one first wire component made of a first metal having a high electrical conductivity and at least one second wire component made of a second metal having a magnetic susceptibility opposite in sign to magnetic susceptibility of said first wire component;

placing said first and second wire components close and parallel to each other; and

forming a thin film of a third metal on at least one surface of said first and second wire components, said third metal having a magnetic susceptibility opposite in sign to a total magnetic susceptibility of said first and second wire components.

6. A method of fabricating a wire member as set forth in claim 5, wherein said first wire component has a tubular shape and holds said second wire component therein, and wherein said thin film is formed on a surface of said first wire component by plating or evaporation.

7. A method of fabricating a wire member as set forth in claim 5, wherein said first metal is copper, said second metal is platinum, and said third metal is one of platinum and rhodium.

8. A method of fabricating a wire member as set forth in claim 5, wherein said first metal has a diamagnetic susceptibility, said second metal has a paramagnetic susceptibility, and said third metal has one of a diamagnetic susceptibility and a paramagnetic susceptibility.

9. A method of fabricating a wire member as set forth in claim 5, wherein said first and second components are formed by separate process steps, cut to desired lengths, and then assembled.