毕业设计(论文)
基于压电传感器的心率计
计算机设计与模拟
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2010 年 6 月摘 要
脉搏波呈现的形态、强度、速度和节奏的综合信息可以反映人体心血管系统中许多生理疾病的血流特征。本文根据人体脉搏信号的特点，设计了脉搏波动频率测量系统。基于压电传感器的心率计主要由测量电路、放大电路、滤波整形电路、计数显示电路、控制电路和电源电路六部分组成。传感器的选择是设计中的首要任务，其次是信号的放大和计数电路的设计，关键是计数电路中计数方法的选择。显示电路可以借助传统的设计模块作为参考。利用压电传感器，将人体的脉搏通过压电陶瓷片转换为可处理的电信号，经过集成运算放大器、滤波电路、整形电路等模块，在555时基电路、数码显示、控制、计数等电路元件的配合下，利用Multisim2001模拟软件，可实现此心率计的模拟设计。根据各电路模块的功能特点，有多种方案可供选择。在设计过程中，我们利用所掌握的理论知识对各种方案进行比较，并要求选择最佳方案，完成整体设计并实现利用Multisim模拟每个模块的2001软件。
本设计任务详细分析了压电传感器应用于心率测量的原理和优点，阐述了其他配合电路的组成和工作特点，得到了不同测量数据和技术参数条件下的模拟结果，实现了本项目的预期结果。关键词：压电传感器、控制电路、计数器、 Multisim2001仿真软件
AThe shape, intensity, speed, and rhythm of pulse signals mostly reflect the physical and pathological characters of heart-blood system in human bodies. According to the characteristics of the human pulse signals, a pulse fluctuation frequency measurement system is designed. The design of piezoelectric sensors on the basis of heart rate, the main principle behind the structure from the six components, including: measuring circuit, amplifier, filter plastic circuit, counts show circuit, control circuits, power supply circuits. The selection of these sensors is the primary task in the design, followed by the signal is enlarged and the number of circuit design, the key point is counting circuit in the counting method choice. Show circuit can use the traditional design module as a reference. Use of piezoelectric sensors, will feel the pulse of the human body through the piezoelectric ceramics can handle the conversion to electrical signals, through integrated operational amplifiers, filter circuits, such as plastic circuit module, in 555 at-circuit, digital display, control, counting and other circuit elements , Coupled with the use Multisim2001 simulation software, can achieve this rate of simulation design. Each circuit module, according to t