Sample head for nuclear resonance measurements

Details Sample head for nuclear resonance measurements Sample head for nuclear resonance measurements

1991-01-17

1993-07-20

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

052297241

ABSTRACT:
A sample head for performing nuclear magnetic resonance measurements on a first kind of nuclei (.sup.1 H) and, further, on a second (.sup.15 N) or a third (.sup.31 P) kind of nuclei within a magnetic field (B) is disclosed. A measuring coil coacts with a sample under analysis and generates a nuclear magnetic resonance within the sample or receives a nuclear magnetic resonance signal from the sample. Terminals are provided for transmitting to or receiving from the measuring coil high-frequency signals having frequencies corresponding to the particular nuclear magnetic resonance frequency of the specific kinds of nuclei (.sup.1 H, .sup.15 N, .sup.31 P), respectively. A high-frequency line is connected to the measuring coil at one end thereof. The line has an electric length which is an integer multiple of a quarter wavelength corresponding to the first, higher frequency. Switching means are associated to the line for switching its electrical length according to two distinct modes of operations where the second and the third, lower frequencies have different values below the first, higher frequency. By actuating the switching means, the line acts as an inductance or as a capacitance, respectively, connected in series with the measuring coil.

REFERENCES:
patent: 4446431 (1984-05-01), McKay
patent: 4728896 (1988-03-01), Bendall et al.
patent: 4801885 (1989-01-01), Meissner et al.
patent: 4952879 (1990-08-01), Van Vaals et al.
patent: 4996482 (1991-02-01), Fujito
patent: 5038105 (1991-08-01), Codrington et al.
Review of Scientific Instruments, vol. 47, No. 12, Dec. 1976, pp. 1486 to 1488, "Single coil probe with transmission-line tuning for nuclear magnetic double resonance"-Author V. R. Cross, R. K. Hester, and J. S. Waugh.
Journal of Magnetic Resonance 43 (1981), pp. 339 to 416 "A Multinuclear Double-Tuned Probe for Applications with Solids or Liquids Utilizing Lumped Tuning Elements" Authors: F. David Doty, Ruth R. Inners, and Paul D. Ellis.
Review of Scientific Instruments, vol. 51 (7), Jul. 1980, pp. 887 to 890 "A single-coil triple resonance probe for NMR experiments" Authors: S. Kan, M. Fan, and J. Courtieu.

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