Patent ID: 7372272
Filing Date: 2008-05-13
Classification: G01R

Abstract:
1. A NMR apparatus having a magnetic unit for generating a static magnetic field, a NMR probe having a transmitter coil for radiating an electromagnetic wave to a sample inserted in the magnetic unit and a receiver coil for detecting a signal generated from the sample and an electromagnetic wave transceiver apparatus electrically connectable to either the transmitter coil or receiver coil in the NMR probe, said electromagnetic wave transceiver apparatus comprising: an intermediate frequency generator for preparing an intermediate wave; a transmission frequency converter for preparing, on the basis of an intermediate frequency of the intermediate wave, an electromagnetic wave to be radiated from said transmitter coil; a reception frequency converter for processing a signal received by said NMR probe; an analog-digital converter for converting an output of said reception frequency converter into a digital signal; an IQ (in-phase & quadrature-phase) detector for performing detection on the basis of an output of said analog-digital converter and delivering a detection signal; a phase locked loop for synchronizing a clock frequency for said analog-digital converter with the frequency from said intermediate frequency generator; and a switch interposed between said analog-digital converter and said reception frequency converter to select either an input from said intermediate frequency generator or an input from said reception frequency converter.