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摘要:
脉搏蕴含人体丰富的血流信息,检测脉搏并推导出人体心血管系统健康状态正成为研究的热点。本文利用热注射法合成得到尺寸为3 nm的PbS量子点,在金叉指电极表面通过旋涂的方法构筑PbS量子点光电探测器。基于已制备的PbS量子点光电探测器研制了数据可视化的脉搏检测系统。运用光电容积脉搏波描记法,对同一测试者不同运动状态以及不同测试者同一运动状态进行测量,经过电路处理将测得的数据显示在电子显示屏上。结果表明,探测器在15.2 μW cm−2光强度照射下,其响应度(
R )和探测率(D *)在−3 V偏压下分别为0.33 A/W和1.33×1012 Jones。将其应用于测量脉搏电路中,系统能够有效接收并测得人体脉搏信号。上述结果表明基于PbS量子点光电探测器的脉搏检测系统在灵敏度、稳定性以及可靠性均满足应用要求。-
关键词:
- 硫化铅量子点 /
- 光电探测器 /
- 光电容积脉搏波描记法 /
- 脉搏波测量
Abstract:As the pulse contains rich blood flow information of the humanbody, detecting the pulse and declucing the health status of human cardiovascular system are becoming a hot spot. In this study, PbS quantum dots with a size of 3 nm were synthesized using the hot injection method, and a PbS quantum dot photodetector was constructed on the surface of gold forked fingers electrode through spin coating. Based on the prepared PbS quantum dot photodetector, a data visualization pulse detection system was developed. Using the optoelectronic capacitance pulse wave recording method, we measured the same tester under different exercise states and different testers under the same exercise state, and displayed the measured data on the electronic display screen through circuit processing. The results show that under the illumination of 15.2 μW cm−2 light intensity, its responsivity (
R ) and light detection rate (D *) are 0.33 A/W and 1.33×1012 Jones under −3 V bias voltage, respectively. When used in the pulse measurement circuit, the system can effectively receive and measure the human pulse signal. It can be concluded that the pulse detection system based on the PbS quantum dot photodetector meets the application requirements in terms of sensitivity, stability, and reliability.-
Key words:
- PbS QDs /
- photoelectric detector /
- photoplethysmography /
- pulse detection sensor
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图 2 PbS光电探测器各项测试结果。(a) 所制备材料的XRD数据图;(b) PbS量子点的TEM图,插图为PbS量子点的直径大小分布直方图;(c) PbS光电探测器的SEM图;(d) PbS光电探测器的SEM-EDS图;
Figure 2. Performance test results of photodetector. (a) XRD data of PbS quantum dots; (b) TEM of PbS quantum dots, the illustration is a histogram showing the distribution of diameter sizes of PbS quantum dots, (c) SEM of PbS photodetectors, (d) SEM-EDS of PbS photodetector
图 3 (a) PbS量子点光电探测器在不同光功率密度下的电流-电压(I-V)图;(b) −3 V偏压下PbS量子点光电探测器在不同光功率密度下的电流-时间(I-T)图;(c) PbS量子点光电探测器在
9390 μW cm−2光强下的响应时间图;(d) PbS光电探测器件在不同光功率密度下的响应度曲线图和比探测率曲线图Figure 3. (a) Current-voltage (I-V) diagram of PbS quantum dot photodetector at different optical power densities, (b) current-time (I-T) diagram of PbS quantum dot photodetector at different optical power densities when bas is −3 V, (c) response time of PbS quantum dot photodetector at
9390 μW cm−2 light intensity, (d) responsivity curve and specific detection rate curve of PbS photodetector at different optical power densities表 1 两种系统脉搏检测结果统计表
Table 1. Statistical table of pulse test results of the two systems
(Unit: times/minute) 名称 第一次测试 第二次测试 第三次测试 PbS量子点光电探测器 63 73 68 gladstone 64 70 73 -
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