《传感器1-3章课后习题答案》由会员分享，可在线阅读，更多相关《传感器1-3章课后习题答案（7页珍藏版）》请在金锄头文库上搜索。
1、1. 传感器：能够感受规定的被测量并按照一定规律转换成可用输出信号的器件或装置。2. 按功能分：力敏，热敏，光，湿磁敏传感器；按工作原理：应变式，热变式，压电式。3. 静态特性：a线性度； b灵敏度；c重复性；d迟滞；e重复性，分辨力，测量范围和量程；4. 动态特性：传感器对随时间变化的输入量的响应特性。研究动态特性从时域和频域采用瞬态响应法和频率相应法来分析。5. 电阻应变效应：一根金属导线在其拉长时电阻增大，在受压缩短时电阻减小。6. 直流电桥：联接成环的四个电阻组成。减小或消除非线性误差的方法：提高桥臂比采用差动电桥a，半桥差动，；b，全桥差动，。7. 热输出特性：温度变化，总电阻相对变
2、化；虚假应变为8. 热补偿方法:a,单丝自补偿应变片；b，双丝组合式自补偿应变片；c，电路补偿法9. 电容式传感器：变间距型：极板1固定不动，极板2喂可动电极即动片，当动片随被测量变化而移动时，两级板间距随之发生变化，从而使电容量发生变化。变面积型电容传感器：测量范围大，可测量较大的线位移或角位移变介电常数型电容传感器10.非线性误差灵敏度差动式变间距型传感器单一型传感器11. 调频测量电路：把电容式传感器的电容作为振荡器谐振回路的一部分，与一个电感元件配合成一个振荡器谐振电路。电容量发生变化振荡频率产生相应变化，通过鉴频电路将频率转化为振幅变化，经放大器放大后进行显示，此法叫调频法。12.
3、电容式传感器边缘效应：当极板厚度与极板距离可比时，两级板边缘处的电力线出现分布不均匀的现象。措施：a，适当减小极间距，使电极直径或边长与间距比增大；b，电极做薄，使之与极间距相比减小；c，结构上增设等位环。13. 二极管双T型电路：e 是高频电源 , 它提供幅值为 Ui 的对称方波 , VD1 、 VD2 为特性完全相同的两个二极管 , R1 = R2 = R, C1 、 C2 为传感器的两个差动电容。当传感器没有输入时 , C1 = C2 。电路工作原理如下 : 当 e 为正半周时 , 二极管 VD1 导通、 VD2 截止 , 于是电容 C1 充电 ; 在随后负半周出现时 , 电容 C1 上
4、的电荷通过电阻 R1#, 负载电阻 RL 放电 , 流过 RL 的电流为 I1 。在负半周内 , VD2 导通、 VD1 截止 , 则电容 C2 充电 ; 在随后出现正半周时 , C2 通过电阻 R2, 负载电阻 RL 放电 , 流过 RL 的电流为 I2 。 根据上面所给的条件 , 则电流 I1 =I2, 且方向相反 , 在一个周期内流过 RL 的平均电流为零。 差动脉宽调制电路：以下是大学体验英语综合教程2(第三版)课后翻译答案Unit11. 任何年满18岁的人都有资格投票。(be eligible to, vote)Answer:Anyone over the age of 18 is
5、eligible to vote.2. 每学期开学前，这些奖学金的申请表格就会由学校发给每一个学生。(apply for, scholarship)Answer:A form to apply for these scholarships is sent by the university to every student before the start of every semester.3. 遵照医生的建议，我决定戒烟。(on the advice of)Answer:On the advice of my doctor, I decided to give up smoking.4.
6、公园位于县城的正中央。(be located in)Answer:The park is located right in the center of town.5. 这所大学提供了我们所需的所有材料和设备。(facilities)Answer:The university provides all the materials and facilities we desire.1. 他们花了多年的时间寻找内心的平静，但是收效甚微。(search for)Answer:They spent many years searching for peace of mind, but with litt
7、le success.2. 这种新药的成功研制已经使许多疾病的治疗发生了根本性的变革。(revolutionize)Answer:The successful development of the new drug has revolutionized the treatment of many diseases.3. 由于这个国家的经济不景气，这家公司濒于破产。(on the edge of)Answer:The company is on the edge of bankruptcy due to the economic depression in the country.4. 大学毕业
8、后他成为了一名护士。他认为护士这一职业可能很有发展前途。(rewarding)Answer:He became a nurse after college. He thought nursing could be a very rewarding career.5. 他像往常一样在文件上签了名。(just as)Answer:He signed his name on the paper just as he has always done it.Unit21. 警察们正忙着填写关于这场事故的各种表格。(fill out)Answer:The policemen are busy fi lli
9、ng out forms about the accident.2. 我想在还车之前把油箱加满。(fill up, fuel tank)Answer:I want to fi ll up the fuel tank before returning the car.3. 如果你要投诉，最好遵循正确的程序。(follow the procedure)Answer:If you want to make a complaint, youd better follow the correct procedure.4. 要不是约翰帮忙，我们绝不会这么快就完成实验。(without)Answer:We
10、couldnt have fi nished the experiment so soon without Johns help.5. 暴风雨之后，岸边的人们焦急地搜索湖面以期发现小船的踪迹。(scan for)Answer:After the storm, the people on the shore anxiously scanned the lake for any sign of the boat.1. 这个国家不大，但是在国际事务中它却发挥着重要作用。(play a role)Answer:This country is not big, but it plays an impor
11、tant role in international affairs.2. 正是在我叔叔的帮助下，我得以克服困难，按时完成了任务。(it is . that)Answer:It was with the help of my uncle that I overcame the difficulty and completed the assignment in time.3. 毕业时他决定留在北京，而他最好的朋友却选择了去西藏。(while)Answer:While he decided to stay in Beijing upon graduation, his best friend c
12、hose to go to Tibet.4. 在这次校园英语演讲比赛中，我们班的玛丽获得了第三名。(come in)Answer:In this Campus English Speaking Contest, Mary from our class came in third.5. 你应该知道学习弹钢琴需要有时间，有金钱，还要有毅力。(as well as)Answer:You should know that it takes time, money as well as perseverance to learn to play the piano.Unit31. 我发现量入为出地过日子
13、越来越难了。(increasingly)Answer:I find it increasingly difficult to live within my income.2. 现代政治家们都试图以电视讲话来影响普通百姓。(reach out)Answer:Modern politicians try to reach out to ordinary people in their TV speeches.3. 应该帮助学生对人生采取积极的态度。(adopt)Answer:Pupils should be helped to adopt a positive attitude to life.4
14、. 希望全班同学参加这些讨论。(participate in)Answer:Everyone in the class is expected to participate in these discussions.5. 如果你犯了罪就必须受到惩罚。(crime)Answer:If you commit a crime you must expect to be punished.1.儿子的死让老妇人变得麻木痴呆了。(numb)Answer:The old woman was numbed by her sons death.2.身处所有这些烦恼之中，他依然能保持乐观。(in the mids
15、t)Answer:In the midst of all troubles, he managed to remain cheerful.3. 虽有困难，他们还是设法坚持试验下去。(carry on)Answer:They managed to carry on their experiments in spite of the difficulties.4.我们必须淘汰不合格的申请人。(weed out)Answer:We have to weed out unqualified applicants.5. 医生要他减少抽烟。(cut down on)Answer:The doctor told him to cut down on smoking.Unit41.她在公共汽车站一直等到末班车进站。(come in)Answer:She waited at the bus stop until the last bus came in.2.如果我们能帮得上忙，尽管和我们联系。(contact)Answer:If there is any way we can be of assistance, please do not hesitate to contact us.3 .他需要多少船务人员才
