Analisis flowmeter berbasis resonansi magnetik inti crossed-coils

The aims of the research are to study the feasibility of NMR apparatus as a flowmeter through the response of magnetic resonance signal of a fluid flowing to the velocities. This research is as a part of a programme to develop a blood pressure measuring apparatus that appropriate to use as a medical need. Furthermore, the purpose of invention are to determine the characteristics of the nuclear magnetic resonance flowmeter crossed – coils. The research relates to a method for magnetized a fluid flowing by a static magnetic field and excited by a RF field. The measurement magnetic resonance signal of flowing fluid using Free Induction Decay (FID) method. Two NMR apparatus had been analyzed, that are NMR I apparatus using hard pulse or non selective pulse and NMR II apparatus using soft pulse or selective pulse for excite 1 H spin system. The results showed that NMR I apparatus is not appropriate as the flowmeter alternative, whereas NMR II apparatus provide the linearity of the magnetic resonance signal to velocities enhancement. Therefore, it was concluded that NMR II apparatus with 100 mT static magnet field and 4 MHz selective pulse is appropriate to be used as a blood pressure measuring apparatus