电大传感器与检测技术期末考试试题、试卷小抄参考.doc

专业好文档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.xy()>1 B.xy()=1 C.0<xy()<1 D.xy()=0二、填空题(本大题共5小题，每小题2分，共10分)1.运算100%是计算传感器_的公式。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)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()计算a0和a1。脉冲数ni1020304050位移值xi(mm)0.10.20.30.40.52.图示串联式测温电路，其中Rt=R01+(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10k，若测温范围为 0400，输出电压U0的范围是1V5V，试计算工作电压E和常值电阻Rs各取多少?()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()=Asinc()，求图2所示信号y(t)的频谱，并画出其幅值谱图。(sincx=)"If we don't do that it will go on and go on. We have to stop it; we need the courage to do it."His comments came hours after Fifa vice-president Jeffrey Webb - also in London for the FA's celebrations - said he wanted to meet Ivory Coast international Toure to discuss his complaint.CSKA general director Roman Babaev says the matter has been "exaggerated" by the Ivorian and the British media.Blatter, 77, said: "It has been decided by the Fifa congress that it is a nonsense for racism to be dealt with with fines. You can always find money from somebody to pay them."It is a nonsense to have matches played without spectators because it is against the spirit of football and against the visiting team. It is all nonsense."We can do something better to fight racism and discrimination."This is one of the villains we have today in our game. But it is only with harsh sanctions that racism and discrimination can be washed out of football."The (lack of) air up there Watch mCayman Islands-based Webb, the head of Fifa's anti-racism taskforce, is in London for the Football Association's 150th anniversary celebrations and will attend City's Premier League match at Chelsea on Sunday."I am going to be at the match tomorrow and I have asked to meet Yaya Toure," he told BBC Sport."For me it's about how he felt and I would like to speak to him first to find out what his experience was."Uefa has opened disciplinary proceedings against CSKA for the "racist behaviour of their fans" during City's 2-1 win.Michel Platini, president of European football's governing body, has also ordered an immediate investigation into the referee's actions.CSKA said they were "surprised and disappointed" by Toure's complaint. In a statement the Russian side added: "We found no racist insults from fans of CSKA."Baumgartner the disappointing news: Mission aborted.The supersonic descent could happen as early as Sunda.The weather plays an important role in this mission. Starting at the ground, conditions have to be very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. It will climb higher than the tip of Mount Everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.The balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform.Below, the Earth becomes the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he'll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end.Skydiver preps for the big jumpWhen he jumps, he is expected to reach the speed of sound - 690 mph (1,110 kph) - in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him completely.If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it's not needed. Instead, he plans to deploy his 270-square-foot (25-square-meter) main chute at an altitude of around 5,000 feet (1,524 meters).In order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds.Even if everything goes as planned, it won't. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters).cause there