Simultaneous measurement of temperature and velocity maps by inversion recovery tagging method

A new method, called the inversion recovery (IR) tagging method, for simult aneous measurement of temperature and velocity maps of flowing fluid has be en developed. The present method employs a set of tagging pulses which acts as an inversion pulse of the conventional IR method, based on the temperat ure dependence of the spin-lattice relaxation of water proton in a fluid, a nd has the advantage of being able to compensate the reduction of the NMR s ignal intensity due to flow motion and to reduce the total time to measure these maps. First, the accuracy of the temperature measurement of stagnant doped water in a differentially heated cell using the conventional IR metho d, as the basic sequence of the IR tagging method, has been evaluated. The accuracy was within 10% of the temperature difference Delta T = 17.2 degree s C and the measurable temperature resolution was within +/-0.5 degrees C. Then temperature and velocity maps of the flowing doped-water through a coo led pipe were measured simultaneously by the IR tagging method, and the acc uracy of temperature measurement was evaluated. The accuracy obtained using the present method was within 15% of the temperature difference Delta T = 15 degrees C. (C) 2000 Elsevier Science Inc. All rights reserved.