The magnetic flux required for obtaining a magneto plethysmogram (MPG)is generated by a permanent magnet placed on the wrist surface such that the generated flux couples with the blood flow in the radial artery. The technique of optimal design of the MPG sensor head is presented in the seminar. To attain the optimization, first the U-shaped sensor head is simulated using the COMSOL Multiphysics finite element method. Simulation is carried out by varying the distance between the open ends of the U-shaped probe. To validate the simulation results, experiments were conducted by fabricating and testing the prototype probes of varying distances between the pole faces, on 20 volunteers of different age and gender. The experimental results validate the results obtained from the simulation study.

Using the optimized sensor head, an MPG system is developed for the real time, noncontact, noninvasive measurement of hemoglobin concentration. The basic principle of modulated magnetic signature of blood, is validated with clinical trial. Clinical validation with data from 64 patients is carried out at the institute hospital of New Rummy Game, using the MPG system. Linear regression analysis using the least square method, exhibited a standard deviation of 0.64 g/dL. Results from the clinical validation establish the practicability of the proffered MPG system.