u2212 5 in absorbance peak to peak within a 10 hz bandwidth however a 3 0 u00d7 10 u2212 5 absorbance peak to peak baseline noise level within a 10 hz bandwidth is difficult to obtain with the low light power levels that are used by some battery powered hand held non invasive blood chemicals measurement devices one solution involves data averaging to increase the s n ratio the averaged value of u03b4a as defined by the equation below is used in further calculation to extract blood glucose concentration in equation 6 m is the number of heartbeats during the time interval of the pulsatile measurement however this approach requires long data acquisition time due to the fact that the rate of heartbeat is in the order of one per second for example 25 seconds would be needed for increasing the s n ratio by a factor of five and 100 seconds would be needed for increasing the s n ratio by a factor of ten in comparison current commercial blood drawing glucose meters can determine blood glucose level within 5 seconds furthermore long detection time will significantly increase measurement errors due to finger movement light power drift device temperature change etc thus there is a need for new techniques to measure blood glucose levels quickly and accurately the time dependent detector photocurrent output i d t shown in fig1 can be expressed as the sum of a small time dependent cyclic photocurrent u03b4i t corresponding to the heartbeat a noise current n t and a constant baseline photocurrent i b i d t i b u03b4i t n t 7 applying common logarithm to both side of the equation 8 one obtains fig3 which is generally indicated.