Rf spectrometer employing modulation of a dc magnetic field to excite resonance

Claim 2

In a radiofrequency spectrometer, means for exciting radiofrequency resonance simultaneously of a plurality of resonance lines in a sample of matter under investigation immersed in a polarizing magnetic field, means for receiving a composite resonance signal emanating from the sample and containing the simultaneously excited plural resonance lines signals characteristic of the sample of matter under analysis, the improvement wherein said means for exciting radiofrequency resonance simultaneously of the plural resonance lines includes means for irradiating the sample with radiofrequency energy, and means for time varying the intensity of the polarizing magnetic field to produce a spectrum of alternating magnetic fields impinging upon the sample, said alternating magnetic fields having a bandwidth wide enough to cover the to be examined plural resonance lines of the sample, to excite simultaneous resonance of the plural resonance lines of the sample under analysis wherein said means for time varying the intensity of the polarizing magnetic field includes, means for modulating the intensity of the polarizing field with noise energy.

Claim 3

In a radiofrequency spectrometer, means for exciting radiofrequency resonance simultaneously of a plurality of resonance lines in a sample of matter under investigation immersed in a polarizing magnetic field, means for receiving a composite resonance signal emanating from the sample and containing the simultaneously excited plural resonance lines signals characteristic of the sample of matter under analysis, the improvement wherein, said means for exciting radiofrequency resonance simultaneously of the plural resonance lines includes means for irradiating the sample with radiofrequency energy, and means for time varying the intensity of the polarizing magnetic field to produce a spectrum of alternating magnetic fields impinging upon the sample, said alternating magnetic fields having a bandwidth wide enough to cover the to be examined plural resonance lines of the sample, to excite simultaneous resonance of the plural resonance lines of the sample under analysis wherein said means for time varying intensity of the polarizing magnetic field includes, means for pulse modulating the intensity of the polarizing magnetic field with a random or pseudorandom pulse sequence.

Claim 4

In a radiofrequency spectrometer, means for exciting radiofrequency resonance simultaneously of a plurality of resonance lines in a sample of matter under investigation immersed in a polarizing magnetic field, means for receiving a composite resonance signal emanating from the sample and containing the simultaneously excited plural resonance lines signals characteristic of the sample of matter under analysis, the improvement wherein, said means for exciting radiofrequency resonance simultaneously of the plural resonance lines includes means for irradiating the sample with radiofrequency energy, and means for time varying the intensity of the polarizing magnetic field to produce a spectrum of alternating magnetic fields impinging upon the sample, said alternating magnetic fields having a bandwidth wide enough to cover the to be examined plural resonance lines of the sample, to excite simultaneous resonance of the plural resonance lines of the sample under analysis wherein said means for time varying intensity of the polarizing magnetic field includes, means for pulse modulating the intensity of the polarizing magnetic field with a random or pseudorandom pulse sequence.

Claim 5

The apparatus of claim 2 wherein said pulses have an amplitude Hp defined approximately by the relation: where gamma is the gyromagnetic ratio for the sample, and t is the pulse length, and where the pulse length t is much shorter than the average period between pulses.

Claim 6

In a method of radiofrequency spectroscopy the steps of, immersing a sample under investigation in a polarizing magnetic field, irradiating the sample with radiofrequency energy, and time varying the intensity of the polarizing magnetic field in such a manner as to produce a spectrum of alternating magnetic fields to impinge upon the sample, said magnetic field having a bandwidth wide enough to cover the to be examinEd plural resonance lines of the sample to excite simultaneous resonance of the plural resonance lines of the sample under analysis wherein the step of time varying the intensity of the polarizing magnetic field includes the step of, modulating the intensity of the polarizing magnetic field with noise energy.

Claim 7

In a method of radiofrequency spectroscopy the steps of, immersing a sample under investigation in a polarizing magnetic field, irradiating the sample with radiofrequency energy, and time varying the intensity of the polarizing magnetic field in such a manner as to produce a spectrum of alternating magnetic fields to impinge upon the sample, said magnetic field having a bandwidth wide enough to cover the to be examinEd plural resonance lines of the sample to excite simultaneous resonance of the plural resonance lines of the sample under analysis wherein the step of time varying the intensity of the polarizing magnetic field includes the step of, modulating the intensity of the polarizing magnetic field with noise energy.

Claim 8

In a method of radiofrequency spectroscopy the steps of, immersing a sample under investigation in a polarizing magnetic field, irradiating the sample with radiofrequency energy, and time varying the intensity of the polarizing magnetic field in such a manner as to produce a spectrum of alternating magnetic fields to impinge upon the sample, said magnetic field having a bandwidth wide enough to cover the to be examined plural resonance lines of the sample to excite simultaneous resonance of the plural resonance lines of the sample under analysis wherein the step of time varying the intensity of the polarizing magnetic field includes the step of pulse modulating the intensity of the polarizing magnetic field with a random or pseudo random pulse sequence.

Claim 9

In a method of radiofrequency spectroscopy the steps of, immersing a sample under investigation in a polarizing magnetic field, irradiating the sample with radiofrequency energy, and time varying the intensity of the polarizing magnetic field in such a manner as to produce a spectrum of alternating magnetic fields to impinge upon the sample, said magnetic field having a bandwidth wide enough to cover the to be examined plural resonance lines of the sample to excite simultaneous resonance of the plural resonance lines of the sample under analysis wherein the step of time varying the intensity of the polarizing magnetic field includes the step of pulse modulating the intensity of the polarizing magnetic field with a random or pseudo random pulse sequence.

Claim 10

In a method of radiofrequency spectroscopy the steps of, immersing a sample under investigation in a polarizing magnetic field, irradiating the sample with radiofrequency energy, and time varying the intensity of the polarizing magnetic field in such a manner as to produce a spectrum of alternating magnetic fields to impinge upon the sample, said magnetic field having a bandwidth wide enough to cover the to be examined plural resonance lines of the sample to excite simultaneous resonance of the plural resonance lines of the sample under analysis wherein the step of time varying the intensity of a polarizing magnetic field includes the step of, pulse modulating the intensity of the polaring magnetic field with a pseudorandom pulse sequence wherein the pulses have an amplitude Hp defined approximately by the relation: where gamma is the gyromagnetic ratio for the sample, t is the pulse length, and where the pulse length is much shorter than the average period between pulses.

Claim 11

In a method of radiofrequency spectroscopy the steps of, immersing a sample under investigation in a polarizing magnetic field, irradiating the sample with radiofrequency energy, and time varying the intensity of the polarizing magnetic field in such a manner as to produce a spectrum of alternating magnetic fields to impinge upon the sample, said magnetic field having a bandwidth wide enough to cover the to be examined plural resonance lines of the sample to excite simultaneous resonance of the plural resonance lines of the sample under analysis wherein the step of time varying the intensity of a polarizing magnetic field includes the step of, pulse modulating the intensity of the polaring magnetic field with a pseudorandom pulse sequence wherein the pulses have an amplitude Hp defined approximately by the relation: where gamma is the gyromagnetic ratio for the sample, t is the pulse length, and where the pulse length is much shorter than the average period between pulses.