Automatic magnetic field measuring apparatus using NMR principle

Details Automatic magnetic field measuring apparatus using NMR principle Automatic magnetic field measuring apparatus using NMR principle

1987-03-18

1988-12-13

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a magnetometer

G01R 3324

Patent

active

047913681

ABSTRACT:
An external magnetic field is first measured with a certain degree of accuracy using an ancillary (for example, Hall effect) magnetic field measurement device. This measured value is used to calculate an estimate of the nuclear magnetic resonance frequency of a substance placed in the magnetic field. Thereafter, the magnetic field is more accurately determined by varying a bias magnetic field over a range and measuring the variation of the inductance characteristics of a high-frequency coil surrounding the substance which is transmitting at the estimated NMR resonance frequency. By strategically choosing the range of values of bias coil current which produce the bias magnetic field, the invention repeatedly narrows the range in which the magnetic resonance effect can occur so as to derive successively more accurate estimations of the bias coil current occurring at the resonance point, until a predetermined accuracy is attained. The result of the magnetic field measurement is computed from the estimated NMR frequency and the resonance point current, and is rapidly displayed.

REFERENCES:
Toyota, Electronic Measurement, Chapter 4, Section 4.9.1.e "Nuclear Magnetic Resonance"; 1966; (Figure 4.100).

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