NMR measurement method

Abstract

There is disclosed an NMR measurement method and NMR apparatus in which the temperature of the NMR detection coil or the RF irradiation coil hardly varies if pulsed RF power is applied to the coil during NMR measurements. The apparatus includes the detection coil or the RF irradiation coil, a first RF power application means for applying RF power of a frequency necessary for measurement of NMR signals, a second RF power application means for applying RF power of a frequency not affecting the measurement of NMR signals, and a control means for controlling the two power application means such that the sum of the RF power applied to the coil from the first application means and the RF power applied to the coil from the second application means is kept almost constant.

1 . An NMR measurement method comprising the step of: 
 applying RF power of a frequency not affecting measurement of an NMR signal to a detection coil or the RF irradiation coil complementarily.    
   
   
       2 . The NMR measurement method set forth in  claim 1 , wherein said detection coil or the RF irradiation coil has a resonance mode which is different from a resonance mode at a measurement frequency for the NMR signal and which does not affect the measurement of the NMR signal.  
   
   
       3 . The NMR measurement method set forth in  claim 1 , wherein said frequency not affecting the measurement of the NMR signal is shifted from the measurement frequency for the NMR signal by a given frequency and can resonate in the same resonance mode as the measurement frequency for the NMR signal.  
   
   
       4 . The NMR measurement method set forth in any one of  claims 1  to  3 , wherein the total amount of RF power applied to the detection coil or the RF irradiation coil is controlled to be almost constant irrespective of whether the RF power of the frequency necessary for the measurement of the NMR signal is applied or not.