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US 2001/0011155 A1Published application
Method and apparatus for detecting a magnetically responsive substance
OwnerUri Rapoportinventor
Life of this patent
Estimating the term…
Abstract
Method and apparatus for detecting in a sample a substance which responds to an applied magnetic field, such as a paramagnetic substance. The sample is placed in an applied magnetic field, and the effect of the sample on a performance characteristic such as resonance frequency of an electrical conductor is correlated to the presence of the substance. The method and apparatus may be adapted for qualitative and quantitative determination.
Claims48
A method for detecting in a sample the presence of a substance that is either paramagnetic, diamagnetic, or ferromagnetic, the method comprising
- (a) providing a first conductor in operative relation to the sample;
- (b) applying an electromagnetic signal to said first conductor, said signal not inducing any substantial physical or chemical change in the sample;
- (c) determining a baseline value of the resonance frequency of said first conductor while in operative relation to the sample and with the electromagnetic signal applied to said first conductor,
- (d) applying a magnetic field to the sample,
- (e) determining a measured value of the resonance frequency of said first conductor while in operative relation to the sample, and with the electromagnetic signal applied to the said first conductor and with the magnetic field applied to the sample;
- and
- (f) correlating the difference between the measured value of the resonance frequency and the baseline value of the resonance frequency to the presence of the substance to be detected.
4 more elements
A method for detecting in a sample the presence of a substance that is either paramagnetic, diamagnetic, or ferromagnetic, the method comprising
- (a) providing a first conductor in operative relation to the sample;
- (b) applying an electromagnetic signal to said first conductor, said signal not inducing any substantial physical or chemical change in the sample;
- (c) determining a baseline value of the resonance frequency of said first conductor while in operative relation to the sample and with the electromagnetic signal applied to said first conductor,
- (d) applying a magnetic field to the sample,
- (e) determining a measured value of the resonance frequency of said first conductor while in operative relation to the sample, and with the electromagnetic signal applied to said first conductor and with the magnetic field applied to the sample;
- (f) repeating step (e) one or more times over a period of time, and
- wherein the sample is a resin undergoing a physical change of state and any change in the resonance frequency of the conductor indicates the progress of the change of physical state of the resin.
4 more elements
A method of detecting in a sample the presence of a substance that is either paramagnetic, diamagnetic, or ferromagnetic, the method comprising
- (a) providing a first conductor in operative relation to the sample;
- (b) applying an electromagnetic signal to said first conductor, said signal not inducing any substantial physical or chemical change in the sample;
- (c) applying a magnetic field to the sample;
- (d) determining a measured value of the resonance frequency of said first conductor while in operative relation to the sample, and with the electromagnetic signal applied to said first conductor and with the magnetic field applied to the sample;
- (e) repeating step (d) one or more times over a period of time;
- and
- (f) correlating any change in the measured value of the resonance frequency over time to a change in the amount of the substance to be detected.
4 more elements
A method for detecting in a sample the presence of a substance that is either paramagnetic, diamagnetic, or ferromagnetic, the method comprising
- (a) providing a first conductor in operative relation to the sample;
- (b) applying an electromagnetic signal to said first conductor, said signal not inducing any substantial physical or chemical change in the sample;
- (c) determining a baseline value of the resonance frequency of said first conductor while in operative relation to the sample and with the electromagnetic signal applied to said first conductor;
- (d) placing the sample in operative relation to a second conductor;
- (e) applying an electromagnetic signal to the second conductor, said signal not inducing any substantial physical or chemical change in the sample;
- (f) determining a baseline value of the resonance frequency of said second conductor while in operative relation to the sample;
- (g) applying a magnetic field to the sample;
- (h) determining a measured value of the resonance frequency of said second conductor while in operative relation to the sample, and with the magnetic field applied to the sample;
- and
- (i) correlating the differences between the baseline value of the resonance frequency of the first conductor, the baseline value of the resonance frequency of the second conductor, and the measured value of the resonance frequency of the second conductor to the presence of the substance to be detected.
7 more elements
A method for detecting in a sample the presence of a substance that is either paramagnetic, diamagnetic, or ferromagnetic, the method comprising
- (a) providing a first conductor in operative relation to the sample;
- (b) applying an electromagnetic signal to said first conductor, said signal not inducing any substantial physical or chemical change in the sample;
- (c) determining a baseline value of the resonance frequency of said first conductor while in operative relation to the sample and with the electromagnetic signal applied to said first conductor;
- (d) placing the sample in operative relation to a second conductor;
- (e) applying an electromagnetic signal to the second conductor, said signal not inducing any substantial physical or chemical change in the sample;
- (f) determining a baseline value of the resonance frequency of said second conductor while in operative relation to the sample;
- (g) applying a magnetic field to the sample;
- (h) determining a measured value of the resonance frequency of said second conductor while in operative relation to the sample, and with the magnetic field applied to the sample;
- (i) repeating step (h) one or more times over a period of time;
- and
- (j) correlating any change in the measured value of the resonance frequency of the second conductor over time within a change in the amount of the substance to be detected.
8 more elements
A method for detecting in a sample the presence of a substance that is either paramagnetic, diamagnetic, or ferromagnetic, the method comprising
- (a) providing a first conductor in operative relation to the sample;
- (b) applying an electromagnetic signal to said first conductor, said signal not inducing nay substantial physical or chemical change in the sample;
- (c) determining a baseline value of the resonance frequency of said first conductor while in operative relation to the sample and with the electromagnetic signal applied thereto,
- (d) applying a magnetic field to the sample,
- (e) determining a measured value of the resonance frequency of said first conductor while in operative relation to the sample, and with the electromagnetic signal applied to said first conductor and with the magnetic field applied to the sample;
- (f) repeating step (e) one or more times over a period of time, and
- wherein the sample is undergoing a physical change of state and any change in the measured resonance frequency of the conductor indicates the progress of the change of physical state of the sample.
4 more elements
A method for determining the crystal polarization of a sample comprising:
- (a) providing a first conductor in operative relation to the sample;
- (b) applying an electromagnetic signal to said first conductor, said signal not inducing any substantial physical or chemical change in the sample;
- (c) determining a baseline value of the resonance frequency of said first conductor while in operative relation to the sample and with the electromagnetic signal applied to said first conductor,
- (d) applying a magnetic field to the sample,
- (e) determining a measured value of the resonance frequency of said first conductor while in operative relation to the sample, and with the electromagnetic signal applied to the said first conductor and with the magnetic field applied to the sample,
- (f) changing the orientation of the axis of the magnetic field and the orientation of the sample with respect to one another,
- (g) determining a measured value of the resonance frequency of said first conductor while in operative relation to said sample, and with the magnetic field applied to the sample in said changed orientation with respect to one another,
- (h) correlating the difference between the values of the resonance frequency as measured in step (e) and step (g) with the crystal polarization of the sample.
5 more elements
An apparatus for detecting in a sample the presence of a substance that is either paramagnetic, diamagnetic, or ferromagnetic, the apparatus comprising
- a first conductor in operative relation to the sample;
- a means for applying an electromagnetic signal to said first conductor, said signal not inducing any substantial physical or chemical change in the sample;
- a means for applying a magnetic field to the sample;
- and
- a means for measuring the resonance frequency of said first electrical conductor while in operative relation to the sample and with the electromagnetic signal applied to said first conductor, the measured value of the resonance frequency being a function of the presence in the sample of the substance to be detected.
2 more elements
An apparatus for detecting in a sample the presence of a substance that is either paramagnetic, diamagnetic, or ferromagnetic, said apparatus comprising,
- a first conductor positionable in operative relation to the sample;
- a means for applying an electromagnetic signal to said first conductor, said signal not inducing any substantial physical or chemical change to the sample;
- a means for applying a magnetic field to the sample when the sample is in operative relation to said first conductor;
- a means for measuring the resonance frequency of said first electrical conductor;
- a second conductor positionable in operative relation to the sample;
- a means for applying an electromagnetic signal to said second conductor;
- and
- a means for measuring the resonance frequency of said second conductor, whereby the measured value of the resonance frequency of said first conductor and the measured value of the resonance frequency of said second conductor can be correlated with the presence in the sample of the substance to be detected.
5 more elements
Dependencies are inferred from the claim text.