Patent ID: 8324897

Claim:
A nuclear magnetic resonance (NMR) measurement method comprising: synchronizing a transmit signal synthesizer and a sampling counter, wherein the transmit signal synthesizer generates at least a carrier-frequency component of an NMR radio-frequency (RF) transmit signal; incrementing a signal sampling count generated by the sampling counter and digitally sampling a received NMR signal at a sampling frequency f s lower than a carrier frequency f c of the carrier-frequency component of the transmit NMR signal and a received NMR signal, wherein the received NMR signal is generated by an NMR sample in response to the transmit signal; storing a value of the sampling count indicating the transmit phase of the transmit signal with reference to a time of synchronizing the transmit signal synthesizer and sampling counter; digitally downconverting the received NMR signal; and performing a phase correction to the digitized downconverted NMR signal according to the stored value of the sampling count.