基于PbS量子点光电探测器的脉搏检测系统研究

Research on pulse detection system based on PbS quantum dot photodetector

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15.2μW·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1.33×10^(12) 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。

As the pulse contains rich blood flow information of the human body,detecting the pulse and deducing 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 finger 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,the same tester was measured under different exercise states and different testers were measured under the same exercise state.The measured data was displayed on the electronic display screen through circuit processing.The results show that under the illumination of 15.2μW·cm^(-2) light intensity,its responsivity(R)and light detection rate(D^(*))are 0.33 A/W and 1.33×10^(12) Jones under−3 V bias voltage,respectively.When used in a 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 regarding sensitivity,stability,and reliability.