Patent ID: 7339378

Claim:
A toroidal cavity nuclear magnetic resonance probe unit comprising: a cylindrical outer conductor including an opening at a first end to a central axis, and a hollow inside; a central conductor placed concentrically in the outer conductor; a membrane assembly disposed adhesively to the central conductor, and said membrane assembly interposed between the outer and central conductors; a first flow path, guiding a flow of fluid, extending from a first end of the central conductor toward a second end of the central conductor along the central axis, adjacent to a first side of the membrane assembly; and a cap connecting the first ends of the central and the outer conductor, wherein a sensing magnetic field is generated by applying a RF current between the outer and central conductors and wherein the probe unit is configured to enable real time and in situ detection of variations of characteristics as well as spatial distribution changes of a fluid passing through at least said first flow path and/or detect a chemical reaction in the membrane assembly, by nuclear magnetic resonance in real time and in situ.