Journal of Sensor Technology and Application 传感器技术与应用, 2019, 7(3), 75-85 Published Online July 2019 in Hans. http://www.hanspub.org/journal/jsta https://doi.org/10.12677/jsta.2019.73009
Fingertip Real-Time Blood Pressure Monitor Based on Phototransistor
Anyi Yuan, Xuelei Li, Xiaofeng Zhao*
Key Laboratory of Electronics Engineering, College of Heilongjiang Province, Heilongjiang University, Harbin Heilongjiang
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Received: Jun. 14, 2019; accepted: Jul. 1, 2019; published: Jul. 8, 2019
Abstract
In this paper, a fingertip real-time blood pressure monitor is designed and fabricated with photo-transistor, which consists of the signal processing circuit and fingertip clamp. The optical signal generating/collecting unit comprises a LED and two phototransistors. According to the various light-absorption of flowing blood, the phototransistor is used for collecting the optical signal ab-sorbed by the blood flowing through the fingertip. Based on the photo electric effect, when the phototransistor receives different optical signals, the base current changes correspondingly, which causes the output voltage of the circuit to change, and able to monitor the electrocardio signal. The signal processing circuit completes the amplification, filtering, A/D conversion of the output signal of the differential structure composed of two phototransistors. On the basis of the relationship between blood pressure and pulse trapping, the data are processed by the micropro-cessor, and the dynamic change of blood pressure is analyzed and displayed. Finally, the test and analysis of the fingertip real-time blood pressure monitor proves its feasibility. The result shows that the blood pressure monitor is able to achieve real-time blood pressure measurement, as well as possesses the characteristics of real-time and portability.
Keywords
Photo Transistor, Real-Time Blood Pressure Monitor, The Pulse Signal Processing Circuit
基于光敏三极管的指端动态血压监测仪
袁安怡，李学磊，赵晓锋*
黑龙江大学，黑龙江省普通高等学校电子工程重点实验室，黑龙江 哈尔滨
收稿日期：2019年6月14日；录用日期：2019年7月1日；发布日期：2019年7月8日
*
通讯作者。
文章引用: 袁安怡, 李学磊, 赵晓锋. 基于光敏三极管的指端动态血压监测仪[J]. 传感器技术与应用, 2019, 7(3): 75-85. DOI: 10.12677/jsta.2019.73009
基于光敏三极管的指端动态血压监测仪
