Abstract: The invention concerns a nuclear resonance well logging tool for insertion into a borehole with a permanent magnet which is magnetized perpendicularly to its axis and with means to transmit and to detect high frequency signals whereby the transmission and detection coils are orthogonal. The arrangement is configured for CW operation. The permanent magnet or the transmission and detection coil arrangement may rotate around the axis in order to modulate the nuclear resonance signals.

Abstract: A thermometry system comprising an implantable element having temperature dependent NMR properties, apparatus for applying an RF field to the implantable element, and apparatus for sensing the temperature dependent NMR response of the implantable element and for providing an output indication of temperature of the implantable element.

Abstract: Nuclear magnetic resonance sensing apparatus includingone or more magnets operative to generate a static magnetic field in a region remote therefrom containing materials sought to be analyzed, the one or more magnets defining a longitudinal axis, the static magnetic field having a static field direction substantially perpendicular to the longitudinal axis and having generally uniform amplitude along the azimuth with respect to the longitudinal axis in the remote region;apparatus for generating a variable magnetic field in said remote region in a direction substantially parallel to the static magnetic field;apparatus for generating a radio frequency magnetic field in the remote region for exciting nuclei of the materials sought to e analyzed and having a radio frequency magnetic field direction substantially perpendicular to both the longitudinal axis and to the static field direction; andapparatus for receiving nuclear magnetic resonance signals from the excited nuclei and for providing an output indication o