The Development of a Portable Noninvasive Blood Glucose Measuring Instrument

A portable instrument of noninvasive blood glucose measurement based on DSP(Digital Signal Processor)is developed,with the method of COEM(Conservation of Energy Metabolism).It calculates the blood glucose concentration using parameters as the oxyhemoglobin saturation,blood flow volume,pulse frequency,etc.These parameters are worked out by the humidity,temperature and decrement of double-wavelength ray,which are detected by an integrated sensor.The principle of system,hardware and software composition,algorithm implementation are introduced.In the clinical trials,comparing with the measuring results of AUTOLAB18 biochemical analyzer,the correlation coefficient of the instrument is 0.87.The absolute error is in the range of ±0.5 mmol/L.Experimental results show that the method of COEM is feasible.The instrument using the proposed method has character of rapid detection,high-precision results,reliable performance and be of some significance in diabetes testing.