Abstract: Systems and methods for pre-tuning a main Nuclear Quadrupole Resonance (NQR) probe using a forward sensing probe include a determination of an amount of resonance detuning of the forward sensing probe caused by a moving object entering a field of view of the forward sensing probe. The amount of resonance detuning is used to pre-tune the main probe such that when the moving object enters a field of view of the main probe, the main probe will move back into tune while delivering optimal power to the object for measurement and identification of a material therein.

Abstract: Systems and methods for pre-tuning a main Nuclear Quadrupole Resonance (NQR) probe using a forward sensing probe include a determination of an amount of resonance detuning of the forward sensing probe caused by a moving object entering a field of view of the forward sensing probe. The amount of resonance detuning is used to pre-tune the main probe such that when the moving object enters a field of view of the main probe, the main probe will move back into tune while delivering optimal power to the object for measurement and identification of a material therein.

Abstract: In some embodiments, a near-field sensor comprises an antenna system, transmit circuitry configured to transmit pulses via the antenna system, and receive circuitry configured to receive interrogation signals in response to transmitted pulses. The antenna system can include a first conductive path having one or more loops coupled together, and a second conductive path having one or more loops coupled together, wherein the first and second conductive path are electrically isolated from each other within the antenna system. The transmit circuitry can include a matching network to dissipate energy stored in the transmit circuitry following transmission of a pulse. The receive circuitry can include a suppression network configured to dissipate residual energy within the receive circuitry resulting from transmission of the pulse.