AUTOMATIC TUNING APPARATUS AND METHOD FOR SUBSTANCE DETECTION USING NUCLEAR QUADRUPOLE RESONANCE AND NUCLEAR MAGNETIC RESONANCE

摘要

Apparatus for tuning a system for detecting a target substance through the u se of nuclear quadrupole resonance (NQR) or nuclear magnetic resonance (NMR). The apparatus tunes an RF coil (34) which is employed to excite the substance under test. The tuning apparatus (36) includes a series of fixed value capacitors (93) switched in the tuning circuit by controllable switches (94). A programmable controller (21) is employed to control the switching and thereby the tuning of the coil .