Probe head for nuclear magnetic resonance measurements
First Claim
1. A probe head for nuclear magnetic resonance measurements, wherein at least two different kinds of nuclei are excited by means of radio frequency irradiation within a constant magnetic field, the probe head comprising:
- a pick-up coil cooperating with a sample, said pick-up coil being connected to a first input for feeding a signal of a higher radio frequency to said pick-up coil for exciting a first kind of nuclei and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said first kind of nuclei, said coil being, further, connected to a second input for feeding a signal of a lower radio frequency to said pick-up coil for exciting a second kind of nuclei and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said second kind of nuclei, a radio frequency line being also connected to said pick-up coil, said radio frequency line having an electrical length corresponding to an integer multiple of a quarter wave length of said higher radio frequency; and
a series capacitor being interconnected between said radio frequency line and said pick-up coil.
1 Assignment
0 Petitions
Accused Products
Abstract
A probe head is used for nuclear resonance measurements during which two different kinds of nuclei are excited by means of radio frequency irradiation in a constant magnetic field. The probe head is provided with a pick-up coil receiving a sample under investigation. The pick-up coil is connected to a first input for feeding a signal of higher frequency for exciting a first kind of nuclei and/or for receiving a resonance signal emitted by the first kind of nuclei. The pick-up coil, further, is connected to a second input for feeding a signal of a lower frequency for exciting a second kind of nuclei and/or for receiving a resonance signal emitted by the second kind of nuclei. The pick-up coil, moreover, is connected to a radio frequency line the electrical length of which corresponds to an integer multiple of a quarter of the wave length of the higher frequency. A series capacitor is interconnected between the radio frequency line and the pick-up coil.
-
Citations
26 Claims
-
1. A probe head for nuclear magnetic resonance measurements, wherein at least two different kinds of nuclei are excited by means of radio frequency irradiation within a constant magnetic field, the probe head comprising:
-
a pick-up coil cooperating with a sample, said pick-up coil being connected to a first input for feeding a signal of a higher radio frequency to said pick-up coil for exciting a first kind of nuclei and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said first kind of nuclei, said coil being, further, connected to a second input for feeding a signal of a lower radio frequency to said pick-up coil for exciting a second kind of nuclei and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said second kind of nuclei, a radio frequency line being also connected to said pick-up coil, said radio frequency line having an electrical length corresponding to an integer multiple of a quarter wave length of said higher radio frequency; and
a series capacitor being interconnected between said radio frequency line and said pick-up coil. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A probe head for nuclear magnetic resonance measurements, wherein at least two different kinds of nuclei are excited by means of radio frequency irradiation within a constant magnetic field, the probe head comprising;
-
a pick-up coil cooperating with a sample, said pick-up coil being connected to a first input for receiving a signal of a first radio frequency and operative to excite a first kind of nuclei, and/or for receiving a resonance signal emitted by said nuclei of said first kind of nuclei, said pick-up coil being further connected to a second input for receiving a signal of a second radio frequency lower than said first radio frequency and operative to excite a second kind of nuclei, and/or for receiving a resonance signal emitted by said nuclei of said second kind of nuclei, a radio frequency line connected to said pick-up coil, said radio frequency line having an electrical length corresponding to an integer multiple of a quarter wave length of said first radio frequency; and
a series capacitor interconnected between said radio frequency line and said pick-up coil, said series capacitor being dimensioned such that a radio frequency voltage of said second radio frequency has opposite polarity at terminal ends of said pick-up coil.- View Dependent Claims (7, 8, 9, 10)
-
-
11. A probe head for nuclear magnetic resonance measurements, wherein at least two different kinds of nuclei are excited by means of radio frequency irradiation within a constant magnetic field, the probe head comprising:
-
a pick-up coil cooperating with a sample, said pick-up coil being connected to a first input for receiving a signal of a first radio frequency and operative to excite a first kind of nuclei, and/or for receiving a resonance signal emitted by said nuclei of said first kind of nuclei, wherein said first kind of nuclei is protons (1H), and having a first resonance frequency proportional to a predetermined magnetic field strength, wherein at a constant magnetic field of 13.8 Tesla field strength, said first resonance frequency is about 800 MHz, said pick-up coil being further connected to a second input for receiving a signal of a second radio frequency lower than said first radio frequency and operative to excite a second kind of nuclei, and/or for receiving a resonance signal emitted by said nuclei of said second kind of nuclei, wherein said second kind of nuclei is phosphor (31P) and has a second resonance frequency proportional to said predetermined magnetic field strength, and wherein said second resonance frequency is about 324 MHz, a radio frequency line connected to said pick-up coil, said radio frequency line having an electrical length corresponding to an integer multiple of a quarter wave length of said first radio frequency; and
a series capacitor interconnected between said radio frequency line and said pick-up coil. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A probe head for nuclear magnetic resonance measurements, wherein at least two different kinds of nuclei are excited by means of radio frequency irradiation within a constant magnetic field, the probe head comprising:
-
a pick-up coil cooperating with a sample, a first input for feeding a signal of a first radio frequency to said pick-up coil for exciting a first kind of nuclei, and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said first kind of nuclei, wherein said first kind of nuclei is phosphor (31P) and has a first resonance frequency proportional to a predetermined magnetic field strength, wherein at a constant magnetic field of 11.8 Tesla field strength, said first resonance frequency is about 202 MHz, a second input for feeding a signal of a second radio frequency to said pick-up coil for exciting a second kind of nuclei, and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said second kind of nuclei wherein said second kind of nuclei is silicon (29Si) and has a second resonance frequency proportional to said predetermined magnetic field strength, and wherein said second resonance frequency is about 99 MHz, a radio frequency line also connected to said pick-up coil, said radio frequency line having an electrical length corresponding to an integer multiple of a quarter wave length of said first radio frequency; and
a series capacitor interconnected between said radio frequency line and said pick-up coil. - View Dependent Claims (17, 18, 19, 20, 21)
-
-
22. A probe head for nuclear magnetic resonance measurements, wherein at least two different kinds of nuclei are excited by means of radio frequency irradiation within a constant magnetic field, the probe head comprising:
-
a pick-up coil cooperating with a sample, said pick-up coil being connected to a first input used for feeding a signal of a first radio frequency to said pick-up coil for exciting a first kind of nuclei, and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said first kind of nuclei, wherein said first kind of nuclei is phosphor (31P) and has a first resonance frequency proportional to a predetermined magnetic field strength, and wherein at a constant magnetic field of 11.8 Tesla field strength, said first resonance frequency is about 202 MHz, said pick-up coil being further connected to a second input used for feeding a signal of a second radio frequency lower than said first radio frequency to said pick-up coil for exciting a second kind of nuclei, and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said second kind of nuclei, wherein said second kind of nuclei is aluminum (27Al) and has a second resonance frequency proportional to said predetermined magnetic field strength, and wherein said second resonance frequency is about 122 MHz, a radio frequency line also connected to said pick-up coil, said radio frequency line having an electrical length corresponding to an integer multiple of a quarter wave length of said higher radio frequency; and
a series capacitor interconnected between said radio frequency line and said pick-up coil. - View Dependent Claims (23, 24, 25)
-
-
26. A probe head for nuclear magnetic resonance measurements, wherein at least two different kinds of nuclei are excited by means of radio frequency irradiation within a constant magnetic field, the probe head comprising:
-
a pick-up coil cooperating with a sample, said constant magnetic field having a predetermined direction and said sample being rotated within said field under an angle of 54°
44′
relative to said direction,said pick-up coil being connected to a first input used for feeding a signal of a first radio frequency to said pick-up coil for exciting a first kind of nuclei, and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said first kind of nuclei, said coil being further connected to a second input used for feeding a signal of a second radio frequency lower than said first radio frequency to said pick-up coil for exciting a second kind of nuclei, and/or for receiving from said pick-up coil a resonance signal emitted by said nuclei of said second kind of nuclei, a radio frequency line connected to said pick-up coil, said radio frequency line having an electrical length corresponding to an integer multiple of a quarter wave length of said first radio frequency; and
a series capacitor interconnected between said radio frequency line and said pick-up coil.
-
Specification