Wireless NIRS Instrument With RF Technology For Monitoring Muscle Oxygen

Athletic sports have influence on the human body, and blood oxygen in the muscle is an important index to reflect the physical status. Near-infrared spectroscopy(NIRS) which has been developed rapidly in recent years can monitor the oxygenation of local tissue and organ continuously, noninvasively and in real time. By combining the short-haul wireless communication technology with NIRS, we designed a NIRS wireless instrument for muscle oxygen monitoring based on RF. The instrument is portable and the subjects are given much freedom. We can monitor the muscle oxygen of the athlete in distance.This dissertation describes the design of the whole system scheme, the hardware and the software. And it gives the detailed introduction to every subsystem including light driver of three wave lengths, detector, amplifier and filter, data acquisition, AD conversion, data wireless communication, serial communication and data receiving on PC. The temporal resolution of the system is 400 ms and the wireless communication distance is above 30 meters.By the performance tests, cuff ischemia experiment and in-vivo experiment, the system property and accuracy of measurement has been validated. The performance tests include the long time stability test and dark-noise detection, then the safety and stability of system are insured. In cuff ischemia experiment, it simulates the changeless blood volume condition. The change of Blood volume(Bv), HbO2 and Hb measured by system is accordant with the real physiology status. At last the result of the in-vivo incremental load experiment shows that the muscle oxygen change is highly correlated with load. So we can prove that the system which is applied on athletes is valid.