Method and apparatus for measuring the degree of polarization of polarized gas
AssigneeHellspin Polarisierte Gase GmbH
InventorsTino Grossmann, Werner Heil, Daniela Rohe, Reinhard Surkau, Elke Aidam, Michael Ebert, Ernst-Wilhelm Otten
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Abstract
The invention relates to a method for determining the degree of polarization (P) of a nuclear spin polarized gas, in particular 3He, 129Xe, in which the nuclear spin polarized gas is placed in a container, comprising determining the magnetic field Bd of the pola gas by measuring the magnetic dipole field emerging therefrom and then determining from Bd the degree of polarization of the gas.
Claims26
A method of determining the degree of polarisation of a nuclear spin polarised gas in a container comprising displacing said container and a magnetic field sensor relative to each other, measuring said magnetic field before and after movement of the container and the magnetic field sensor to obtain measurable magnetic field signals, detecting the magnetic field Bd as a function of the difference between the measurable magnetic field signals, and determining the degree of polarisation of the gases from the detected magnetic field Bd.
A method of determining the degree of polarisation of a nuclear spin polarised gas in a container, comprising applying a high frequency magnetic field pulse to the gas to reverse the polarisation of the gas, measuring the magnetic field before and after application of the high-frequency magnetic field pulse to obtain measurable magnetic field signals, detecting the magnetic field Bd such that the difference between the measurable magnetic field signals is twice the value of the magnetic field Bd, and determining the degree of polarisation of the polarised gas from the detected measurable magnetic field Bd.
Apparatus for determining the degree of polarisation of a nuclear spin polarised gas comprising a magnetic field sensor and a container containing a nuclear spin polarised gas, said magnetic field sensor and container being displaceable relative to each other so that the magnetic field can be determined in at least two locations, and magnetic field applying means arranged to apply a magnetic field to the container.
Apparatus for determining the degree of polarisation of a nuclear spin polarised gas comprising a magnetic field sensor a container containing a nuclear spin polarised gas, and a high frequency magnetic field pulse transmitter arranged to apply a time variant, magnetic field to said container which reverses the polarisation of said gas.
Dependencies are inferred from the claim text.