The Development Of High Performance Human Health Detection System Based On Bioelectrical Impedance Technology

The analysis of human body composition has a significant meaning.Clinically,it can help track the effect of therapeutic regimens and diagnose some diseases in early time,which can improve the possibility of recovery.And in the fitness domain,more effective suggestions can be made on the design of diet and exercise planning with results of human body composition.Because of simplicity in use,safety,low cost and possibility of long term monitor,bioelectrical impedance technology has an advantage in human body composition analysis.With the development of bioelectrical impedance technology,the human body composition analyzer based on this technology is becoming more and more broadly used in various occasions.However,these human composition analyzers have various levels of performances.Some of these human composition analyzers have the problem of low precision or difficulty in operation.In this paper we proposed a scheme of high performance human composition analyzer measuring module based on the experience of testing existing bioelectrical impedance module.The human composition analyzer proposed in this paper is based on the multi-segment method and the multi-frequency stimulus method working with eight electrodes.The high performance human consists of the micro control unit,the constant-current source signal generator unit,the front-end measuring unit?the measuring voltage processing unit,the RS232 communication unit and the power unit.With the company of upper control module,the measuring module can make up a human health detection system which can perform a complete human composition analysis independently.In this paper,we select best schemes of the system's circuits and programs unit by unit through theoretical study,simulation and experiment.All in all,the high performance human health detection system can perform a fast,steady and accurate bioelectrical impedance measurement.In this paper,the measuring module,the control module and the power module will be tested as an integral system.The measurement result of resistance network and human body can help evaluate the performance of the system.According to the experiment result,the high performance human composition analyzer using improved schemes has a good measuring repeatability and accuracy.When working in low frequencies,the high performance human composition analyzer can give similar results to the commercial product.