Patent ID: 6191583
Filing Date: 2001-02-20
Classification: G01R

Abstract:
A toroid cavity detector adapted to be placed in an externally applied magnetic field comprising:a cylindrically shaped housing having side walls along an elongated axis extending between first and second end portions that extend generally perpendicular to said elongated axis such that a toroid cavity is formed that is adapted to receive a sample therein, the first and second end portions being sufficiently spaced apart that said first and second end portions are disposed in fringe portions of said externally applied magnetic field;an insulated conductor extending through said second end, extending through said toroid cavity generally parallel to the elongated axis of said toroid cavity and coupled to said housing at said first end;a pulse generator for supplying a pulsed signal to said conductor such that a time variable magnetic field internal to said toroid cavity is developed when said pulsed signal is supplied to said conductor, said time variable magnetic field being at least partially oriented perpendicular to said externally applied magnetic field; anda receiver for processing a sample response to said externally applied magnetic and said time variable magnetic fields.