A New Method to Obtain Frequency Offsets in NQR Multi-Pulse Sequences

A new method to improve the signal to noise ratios in multi-pulse nuclear quadrupole resonance (NQR) sequences was developed. In this method, called TONROF, the transmitter frequency is set on-resonance, while the receiver frequency is offset. Experimental results of using TONROF in conjunction with the SSFP sequence with RDX sample are presented. Elevated signal levels were obtained without losses in transmission efficiency. The results are compared with those obtained with the typically used off-resonance version of SSFP, called strong off-resonance comb (SORC) sequence.