2018年电大传感器与检测技术期末考试试题、试卷全参考 下载本文

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专业好文档 内部文件,版权追溯 内部文件,版权追溯 内部文件,版权追溯 传感器与检测技术试题(5)

一、单项选择题(本大题共10小题,每小题2分,共20分)在每小题列出的四个选项中只有一个选项是符合题目要求的,请将正确选项前的字母填在题后的括号内。 1.属于传感器动态特性指标的是( ) A.迟滞 B.过冲量 C.稳定性 D.线性度

2.传感器能感知的输入变化量越小, 表示传感器的( ) A.线性度越好 B.迟滞越小 C.重复性越好 D.分辨力越高

3.我国省、部一级计量站使用的一等标准测力机所允许的测量误差为( ) A.±0.1% B.±0.01% C.±0.001% D.±0.0001% 4.感应同步器的作用是测量( ) A.电压 B.电流 C.位移 D.相位差

5.下列测力传感器中,属于发电型测力传感器的是( ) A.自感式传感器 B.磁电感应式传感器 C.电容式传感器 D.应变式传感器 6.视觉传感器的扫描部的主作用是( ) A.聚成光学图像信号

B.将光学图像信号转换成电信号

C.将二维图像信号转换为时间序列一维信号 D.抽出有效信号

7.热敏电阻式湿敏元件能够直接检测( ) A.温度 B.温度差 C.相对湿度 D.绝对湿度

8.在采样保持环节中,采样开关被断开的时间称为( ) A.采样时间 B.保持时间 C.采样周期 D.缓冲时间 9.封装在光电隔离耦合器内部的是( )

A.一个发光二极管和一个发光三极管 B.一个光敏二极管和一个光敏三极管 C.两个发光二极管或两个光敏三极管 D.一个发光二极管和一个光敏三极管 10.已知信号x(t)与信号y(t)完全不相关,则该二信号的互相关系数满足( ) A.ρxy(τ)>1 B.ρxy(τ)=1 C.0<ρxy(τ)<1 D.ρxy(τ)=0

二、填空题(本大题共5小题,每小题2分,共10分)

?y?ymaxmin100%是计算传感器________的公式。 1.运算

2.当环境湿度改变时,必须对电容式传感器重新进行静态________。 3.要使直流电桥平衡,必须使电桥相对臂电阻值的________相等。

4.红外图像传感器通常由红外敏感元件和电子________电路组成。 5.在热电偶中,当引入第三个导体时,只要保持其两端的温度相同,则对总热电动势无影响。

这一结论被称为热电偶的________定律。

三、问答题(本大题共5小题,每小题4分,共20分)

?L??Lmax专业好文档 1.压电式传感器往往采用多片压电晶片串联或并联方式,当采用多片压电晶片并联方式时,

适合于测量何种信号?

2.就某一确定的差动变压器式位移传感器而言,当激励电压的幅值恒定时,其输出电压的幅

值和相位分别取决于被测位移的哪些信息? 3.简述半导体P-N结温度传感器的工作机理。

4.热电型红外光导摄像管与可见光光导摄像管在电路中所采用的前置放大器有何差别?为什

么?

5.有源滤波器与无源滤波器相比有哪些优点?

四、计算题(本大题共2小题,每小题15分,共30分)

1.某位移传感器在校准时测得的数据如下表,若该传感器的线性表达式为x=a0+a1n,试用最

??小二乘法(脉冲数ni ?(ai?1N0?a1ni?xi)220 10 )计算a0和a1。 30 40 50 0.1 0.2 0.3 0.4 0.5 位移值xi(mm) 2.图示串联式测温电路,其中Rt=R0[1+?(t-t0)]为感温热电阻,Rs为常值电阻,E为工作电

压,U0为输出电压,?=0.02/℃.当给定温度为0℃,Rt的电阻值为10kΩ,若测温范围为 0℃~400℃,输出电压U0的范围是1V~5V,试计算工作电压E和常值电阻Rs各取多

ERtU0?Rt?Rs) 少?(

五、应用题(本大题共2小题,每小题10分,共20分) 1.用微型计算机、模/数转换(A/D)板、滤波器、电荷放大器、压电式力传感器和打印机组成一个测力系统,

试画出该测力系统的方框图。 1. 图1所示矩形函数x(t)的频谱为

??X(ω)=Aτsinc(2),求图2所示信号y(t)的频谱,并画出其幅值谱图。

sinx(sincx=x)

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