COIL COMPRISING A WINDING COMPRISING A MULTI-AXIAL CABLE

• US 20130134964A1
• Filed: 05/20/2011
• Published: 05/30/2013
• Est. Priority Date: 05/26/2010
• Status: Abandoned Application

• Current Assignee: Acreo Swedish ICT AB
• Original Assignee: Imego Aktiebolag (Government of Sweden)
• Inventors: Blomgren, Jakob, Prieto-Astalan, Andrea, Johansson, Christer, Ahrentorp, Fredrik, Jonasson, Christian
• Application Number:
  US13/699,079
• Publication Number:
  US 20130134964A1
• Time in Patent Office: Days
• US Class Current: 324/201
• CPC Class Codes: G01R 33/16 Measuring susceptibility G01R33/1238 takes precedence
• CPC Class Codes: G01R 35/00 Testing or calibrating of apparatus covered by the other groups of this subclass
• CPC Class Codes: H01F 2027/2833 using coaxial cable as wire
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 5/00 Coils superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00

Abstract

The present invention relates to a coil comprising a winding (45). The winding comprises a multi-axial cable with one shielding layer connected to ground.

Claims

1. A coil comprising a winding, wherein said winding comprises a multi-axial cable with one shielding layer connected to ground.

2. The coil of claim 1, wherein said multi-axial cable is coaxial.

3. The coil of claim 1, wherein said multi-axial cable is triaxial.

4. The coil of claim 1, wherein said coil is an excitation coil in a coil system for susceptometry.

5. The coil of claim 1, wherein said coil is a detection coil in a coil system for susceptometry.

6. The coil of claim 1 for operation in a frequency to 100 MHz, at least 10 MHz.

7. The coil of claim 3, wherein a second shielding layer is connected to a current source voltage.

8. The coil of claim 1, wherein one or several shielding layers of said multi-axial cable is divided in several sections, with each section directly connected to the ground.

12. The device of claim 1 for operation in a frequency to 100 MHz, at least 10 MHz.

9. A device for detecting a dynamic magnetic response or changes in a dynamic magnetic response of a magnetic material or at least one magnetic particle in a carrier fluid, said detection comprising measuring said magnetic particle'"'"'s characteristic magnetic relaxation in said carrier fluid under influence of an external magnetic field, said device comprising means for generating said magnetic field, at least two substantially identical detection coils connected in a gradiometer coupling to detection electronics for measuring the induced voltage that is dependent on the dynamic magnetic properties of a sample in the detection coils, characterized in that said excitation coil and and/or detection coils comprise a winding and said winding comprises a multi-axial cable with at least one shielding layer connected to ground.

10. The device of claim 9, wherein said multi axial cable is coaxial.

11. The device of claim 9, wherein said multi-axial cable is triaxial.

13. The device of claim 11, wherein a second shielding layer is connected to a current source voltage.

14. The device according to claim 9, wherein said field is sinusoidal magnetic field or a pulsed magnetic field.

15. A method of calibrating a device according to claim 9, the method comprising:

a first step of measuring the system response with an empty sample holder,

a second step of computing difference in signal when the empty sample holder is in the first coil to when the sample holder is in the second coil,

a third step of measuring the system with a sample containing a material with a known and preferably frequency independent magnetic susceptibility;

calibrating the system with respect to amplitude and phase changes due to the device itself.

16. A method of calibrating a device according to claim 9, the method comprising:

measuring a signal with no excitation current present, as a background signal,

subtracting said measured signal from a measurement signal to derive magnetic properties of the sample

calibrating with respect to amplitude and phase changes due to device.