Probe coil for detecting NQR-responsive materials in large volumes

摘要

A coil assembly ( 11 ) comprising two coil sections ( 13 a and 13 b). Each of the sections ( 13 ) consists of a combinat of a spiral coil ( 15 ) having a variable coil pitch arranged in a saddle shape configuration. The saddle shape has a central port ( 17 ) and a pair of outer coextending portions ( 19 ). The coil sections ( 13 ) are located opposite each other with the central p( 17 ) of the respective sections disposed in parallel spaced apart relationship and the corresponding coextending portions ( 19 ) of respective sections disposed in coplanar alignment with each other so that the sections combine to circumscribe a scanned volume within which the target substance is to be disposed.