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Non-Contact Radio-Frequency Blood Pressure Sensors
Two types of non-contact radio-frequency blood pressure (BP) sensors, which are developed using “homodyne continuous-wave radar” and “near-field self-injection-locked (NFSIL)” technologies, will be presented in this talk. Both sensors are used to detect the wrist pulse waveform of the radial artery. Then the reflected pulse transit time (RPTT) can be acquired from the measured time-domain pulse waveform and used to compute the BPs of the test subjects. By using the NFSIL BP sensor, as compared with the BPs measured by the commercial sphygmomanometer, the mean difference and standard deviation of the systolic and diastolic BPs of the subjects are 0.26±3.67 and 0.56±6.99 mmHg, respectively.