毕业论文___心率测试仪设计.doc

设计（论文）题目： (此文PAPERPASS查重为17.5% 知网查重为15.7% )  摘 要 本课题设计了一种的。设计主要由部分组成，包括测量电路、放大电路、滤波整形电路、计数显示电路。，其次就是信号的放大及电路的设计，关键点是计数电路中计数方式的选择。，将人体的脉搏为可处理的电信号，利用Mulitisim仿真软件，可以此心率仿真。本只人把手指放在传感器内秒钟就可以精确测量出，测量结果用三位显示【关键词】 反射式传感器 Mulitisim仿真软件 数字脉冲信号  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 test 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, followed by the counter, decoder, eventually display the heart rate test results with A digital tube. Using Mulitisim simulation software can realize the simulation about the heart rate tester. This design only needs to the man putting his finger in the sensor less than 10 seconds to measure the value of