NMR magnetometer probe with a tuneable cavity in its center and a double central cylindrical member

A spin coupling nuclear magnetic resonance magnetometer probe without forbidden axis, said probe comprising:

• at least two liquid samples contained in at least two bottles,
• said bottles being placed in a very high frequency resonant cavity, which is constituted by a central conductor and an outer conductive wall, said central conductor comprising a first section having a first end adapted to be connected to a central conductor of coaxial cable and a second end, and a second section having a first end and a second end connected to the outer conductive wall by a short circuit, at least one regulatable capacitor connected between said second end of said first section and said first end of said second section, said regulatable capacitor permitting the regulation of the resonant frequency of the cavity, the probe also comprising at least two windings for sampling and reinjecting a signal at the Larmor frequency defined by the magnetic field in which the probe is located and by the gyromagnetic ratio of the samples used, said two windings surrounding at least part of the samples,