Abstract
This study introduces the basic principle of relative blood volume monitor (BVM) by comparing several ultrasonic travel time measuring methods, brings forth the high-precision ultrasonic travel time measuring method based on TDC-GP2 time measurement chip and MSP430 Single-chip Microcontroller (SCM), presents the configuration of hardware and software in the system, and illustrates the structure and time measurement principle of TDC-GP2 time measurement chip.
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