生物信息检测及仪器试验指导书

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生物信息检测及仪器

实验指导书

重庆大学生物工程学院生物医学工程系二OO九年十月

目录

试验一压力传感器静态特性测试······································································2试验二张力传感器动态特性测试······································································5试验三热敏电阻特性及补偿方法······································································6试验四电子体温计······························································································9试验五心电图机性能指标测试········································································12试验六生物电位放大器的测试········································································15试验七科氏音传感器及接口电路····································································17试验八红外光电传感器及接口电路································································19试验九心电遥测仪的研究················································································21试验十光耦合器件的测试与应用····································································23试验十一科氏音、脉博波、心电的时相关系··················································25试验十二设计红外光电传感器及接口电路····················································27试验十三生物电位浮地放大器的设计、制作················································29试验十四综合试验：生物医学信息遥测························································33

1

试验一压力传感器静态特性测试

一、试验目的及内容

通过试验，了解半导体压力传感器的原理，把握其静态特性的测试方法及基本参数的计算。本试验要求测量PT14M2型压力传感器的静特性。二、主要试验器材

1、PT14M2型生物压力传感器2、血压计3、数字电压表4、电池、导管等三、基本原理

PT14M2型是采用全套固态传感器新技术制造的内调整扩散硅力敏电阻全桥型压力传感器。

当固体材料受到力的作用时，电阻值将发生变化，电阻的变化由几何尺寸的变化和电阻率的变化引起。电阻的相对变化为：

?RR?(1?2?)??(??)

?其中μ值为0.2~0.4，ε为材料的应用，???为电阻率的相对变化。（1+2

μ）为几何尺寸的变化（应变片灵敏度系数），反映应变片特性的重要指标是灵敏度系数，它是电阻相对变化值与应变之比。

即：k?(?RR)/??1?2??(??)/??170

?PT14M2型压力传感器内部电路图如图1所示。五芯插头、插座管脚图如图2所示。

2

在桥路输入端加上适当的桥压。工作时，使应变片受力后电阻发生变化，电桥失去平衡，在桥路输出端得到一个与输入压强成正比的电信号，输出电压与桥臂的电阻相对变化的关系，经推证为：

?u0?(?RR)*E?K*P*E

式中：E为桥路电源电压；P为压强；K为静态灵敏度。

12345图2

PT14M2的主要性能指标为：

量程：-50mmHg~+300mmHg；非线性与滞后：≤0.2%FS；输出灵敏度：22.5mv/5v；电源电压：3~12VDC；固有频率：≥10KHz四、压力传感器的静态特性

当输入电压为恒定值且不随时间变化时，压力传感器的输出电压也为某一恒定值。此输出电压与输入电压的关系称为压力传感器的静态特性。在静态条件下，利用一定精度等级的设备对传感器进行循环往复的测试，即可得到一组输入-输出数据。各被测量值的正行程和反行程的输出值的平均值的

3

连线称为其静态校准曲线。表征传感器的静态特性的指标主要有：线性度、滞后、重复性、灵敏度。五、试验步骤

1、静态特性测试原理图如图3所示：

图3静态特性测试原理图

（1）按图3连接测试系统

（2）利用血压计球对测试系统加压，加压范围为：0~200mmHg，不得超过220mmHg以免损坏传感器。在加压过程中，观测血压计的读数和数字电压表的输出值。然后每增加20mmHg计录一次读数和输出电压值。

（3）加压到200mmHg时，开始减压，每减少20mmHg记录一输出电压值，直到输入压强为零。

（4）重复（2）、（3）步骤三次，记录结果填入表1中，“↑〞为加压“↓〞为减压。六、报告要求

1、利用表1测得的数据，用座标纸描出静