毕业论文
摘 要
心脏的每一次搏动都会导致手指皮肤毛细血管产生一次充盈和收缩，该血脉变化信号可用于检测心率。本课题设计了一种基于反射式光电传感器的心率测试仪，由反射式光电传感器提取出手指皮肤处的微弱脉搏信号并加以处理，使心率的测量显得更简便更精确。 本设计主要由六部分组成，包括测量电路、放大电路、滤波整形电路、倍频电路、控制电路和计数译码显示电路。该设计的首要任务是测量电路中传感器的选取，其次就是信号的放大及滤波整形电路的设计，关键点是计数译码显示电路中计数和译码确定取消
方式的选择。 该设计利用外置恒流源电路的反射式光电传感器，将人体的脉搏信号转变为可处理的电信号，再将所得电信号经过电压放大、滤除高频、A/D转换和倍频等处理得到数字脉冲信号，gsm模块
接着在由555定时器组成的闸门控制电路的控制下，经过计数器、译码器的处理，最终将心率测试结果用数码管显示出来。
变压器防盗锁
利用Mulitisim仿真软件，可以对此心率测试仪实现仿真。本设计只需要被测人把手指放在传感器内不足10秒钟就可以精确测量出心率值，测量结果用三位七段数码管显示。本设计在仿真实验中，当输入1Hz正弦信号时，经过6次测试，心率平均值为60次/分钟，最大误差1.67%；当输入2Hz正弦信号时，经过6次测试，心率平均值为119次/分钟，最大误差1.68%。仿真结果满足课题要求的当心率大于50次/分钟时，误差小于5%，仿真实验成功，所设计心率测试仪达到预期目的。
【关键词】心率测试仪 反射式传感器屏式电脑 Mulitisim仿真软件 数字脉冲信号大体积混凝土降温
ABSTRACT
The heart beat of each time will cause the capillaries of finger skin have a filling and shrinkage, the changes of blood signal can be used for the detection of heart rate, which causes the finger skin producing the weak vibration. The vibration signal can be used to t宠物垫
est the heart rate This topic designs a heart rate tester which is based on reflecting photoelectric sensor, By reflecting photoelectric sensor extracts the pulse signal from finger skin and process it, at last making the heart rate measurement appears more simple and precise.
This design mainly by six parts, including measuring circuit, amplifying circuit, filtering plastic circuit, times frequency circuit, control circuit and count decode display circuit. As for the design , the selection of sensor is the primary task in the measurement circuit, followed by signal amplifier and filtering plastic circuit design, the key point is that the count of the counter decoder circuit and the choice of the ways of decoding.
This design uses reflecting photoelectric sensor whose outer is constant current source circuit, this design makes the human body pulse signal into the electrical signals which can be handled, and then through the electrical signal voltage amplifier, filtering hf, A/D conversion and frequency doubling processing get digital pulse signal, and then process it under the control of the gate control circuit which is composed by 555 timing device, foll
owed by the counter, decoder, eventually display the heart rate test results with A digital tube.
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