電大傳感器與檢測技術(shù)_自學(xué)考試試卷200410小抄參考

1、專業(yè)好文檔高等教育自學(xué)考試全國統(tǒng)一命題考試傳感器與檢測技術(shù) 試卷(課程代碼2202)本試卷共6頁，滿分100分，考試時間150分鐘。總 分題 號一二三四五核分人題 分2412242416復(fù)查人得 分一、單項選擇題(本大題共12小題，每小題2分共24分)在每小題列出的四個備選項中只有一個是符合題目要求的，請將其代碼填寫在題后的括號內(nèi)。錯選、多選或未選均無分。1屬于傳感器動態(tài)特性指標(biāo)之一的是 【 】 a靈敏度 b固有頻率 c線性度 d重復(fù)性2采用直流放大器對微弱的、變化緩慢的信號進行放大時，影響測量精度的主要原因是 【 】 a零點漂移 b信號微弱 c放大倍數(shù)不足 d噪聲干擾3變極距型電容式位移傳感

2、器的初始極距=0.1mm，為保證測量的線性度，應(yīng)使被測位移量滿足 【 】 a0.1mm b0.1mm c0.1mm d0.1mm4電荷放大器是一個具有反饋電容的高增益運算放大器。該運算放大器的輸入阻抗應(yīng) 【 】 a109 c1012 5在相同工作條件下，對同一被測物理量進行多次連續(xù)測量所得結(jié)果的一致性越好，說明該傳感器的 【 】 a線性度越好 b靈敏度越高 c重復(fù)性越好 d穩(wěn)定性越好6固體半導(dǎo)體攝像機的感光部分是 【 】 a光電轉(zhuǎn)換及放大元件 b電荷耦臺器件 c熱電元件 d光導(dǎo)攝像管7有源濾波器由運算放大器和 【 】 arc網(wǎng)絡(luò)組成 brl網(wǎng)絡(luò)組成 clc網(wǎng)絡(luò)組成 drlc網(wǎng)絡(luò)組成8發(fā)光二極管

3、顯示器的英文縮寫為 【 】 alcd bled cbcd dcrt9靜電屏蔽的作用在于消除靜電荷對測量儀器產(chǎn)生的 【 】 a高次諧波干擾 b放電干擾 c靜電場干擾 d漏電流干攏10由rlc串聯(lián)網(wǎng)絡(luò)組成的帶通濾波器的中心頻率為500hz，帶寬為200hz，則品質(zhì)因數(shù)為 【 】 a0.4 b0.8 c2.5 d511已知一信號的直流分量為零，交流分量的幅值不為零，則該信號的 【 】 a方差等于均方值 b方差等于零 c均值等于均方值 d均方值等于零12信號x(t)與信號y(t)為頻率相同、幅值不同、相位差恒定的兩個周期信號，則其互相關(guān)函數(shù)rxy ()與這兩個信號的 【 】 a頻率無關(guān)，相位差無關(guān) b

4、頻率有關(guān)，相位差有關(guān) c頻率無關(guān)相位差有關(guān) d頻率有關(guān)，相位差無關(guān)二、填空題(本大題共12小題，每小題1分，共12分)請在每小題的空格中填上正確答案。錯填、不填均無分。13用表格法進行傳感器輸出線性化處理的實質(zhì)是_線性補償。14對傳感器輸入相同幅值、不同頻率的正弦信號，測量傳感器的輸出特性，這種試驗是對傳感器進行_標(biāo)定。15電位計式位移傳感器的電阻靈敏度與電位計電阻元件的有效長度成反比，與電位計的總電阻成_。16用電渦流位移傳感器測量旋轉(zhuǎn)軸的轉(zhuǎn)速，其測速齒輪必須用_材料制成。17硅芯片式流速傳感器的輸出信號與流速的_成線性關(guān)系。18磁柵式位移傳感器的磁頭在動或不動的情況下都有感應(yīng)電動勢輸出的是

5、_磁頭。19氣敏元件表面吸附被測氣體時，它的_將發(fā)生變化。20亮度式溫度傳感器和比色式溫度傳感器都屬于_式溫度傳感器。21不能準(zhǔn)確預(yù)測未來瞬時值，也無法用確切的數(shù)學(xué)關(guān)系式描述的信號稱為_ _。22自功率譜是描述隨機信號在_域的特征函數(shù)。23若在時域?qū)⑿盘枆嚎s，則在頻域其頻譜將_。24對機械結(jié)構(gòu)施加某種預(yù)定要求的作用力，使之發(fā)生振動，稱之為_。三、問答題(本大題共6小題，每小題4分共24分)25現(xiàn)有數(shù)字電壓表、放大器、信號發(fā)生器、功率放大器、振動臺、標(biāo)準(zhǔn)傳感器、被標(biāo)定的傳感器等。請設(shè)計一個用比較法對被標(biāo)定傳感器進行動態(tài)標(biāo)定的系統(tǒng)，并簡要說明標(biāo)定原理。26在采用壓電式傳感器的測量系統(tǒng)中，電荷放大器

6、的作用是什么?27說明人工視覺系統(tǒng)中圖像輸入部分的功能。28簡述結(jié)露傳感器在磁帶錄像機中的應(yīng)用情況。29簡述利用算術(shù)平均值法進行數(shù)字濾波時的過程，并寫出計算公式。 30說明如圖所示的周期矩形信號x(t)與非周期矩形信號x1(t)在頻譜結(jié)構(gòu)上的差異和關(guān)系。四、計算題(本大題共3小題。每小題8分。共24分)31一壓電式加速度傳感器，其靈敏度為：k150pc/(ms-2)，與其相接的電荷放大器靈敏度為：k20.006v/pc，記錄儀靈敏度為：k320mm/v (1)求系統(tǒng)總靈敏度k0 (2)若記錄儀記錄到的曲線高度為57mm，求此時所對應(yīng)的加速度。321下圖給出了一種測溫范圍為0100的測溫電路，其

7、中r1=10(1+0005t)k ,感溫?zé)犭娮?；r0 =10k，工作電壓e=10v，m，n兩點的電位差為輸出電壓。計算該測溫電路的平均靈敏度。 題32圖33已知鉑銠鉑熱電偶在冷端為0時的熱電動勢如下表，寫出該熱電偶在冷端為20時的熱電動勢表(自40至100)。t()20406080100e(t,0)(mv)0.1130.2350.3640.5000.643五、應(yīng)用題（本大題共2小題，每題8分，共16分）34. 一霍爾傳感器和帶齒圓盤組成轉(zhuǎn)速測量裝置，經(jīng)放大器和記錄儀，其輸出信號如記錄紙圖所示。 (1)若齒輪齒數(shù)為z=14，求被測轉(zhuǎn)速為每分鐘多少轉(zhuǎn)? (2)用金屬鋁作為帶齒圓盤，是否可行，為什么

8、?35分析以下有關(guān)濾波器的問題 (1)推導(dǎo)圖示濾波器的頻率特性表達(dá)式。 (2)畫出幅頻特性示意圖。(3)指出該電路具有何種濾波作用?if we dont 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 fas celebrations - said he wanted to meet ivory coast

9、 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 mon

10、ey 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.

11、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 fifas anti-racism taskforce, is in london for the football associations 150th anniversary celebrations and will attend citys premi

12、er 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 its about how he felt and i would like to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedings against cskafor the racis

13、t behaviour of their fans duringcitys 2-1 win.michel platini, president of european footballs governing body, has also ordered an immediate investigation into the referees actions.cska said they were surprised and disappointed by toures complaint. in a statement the russian side added: we found no r

14、acist 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 hum

15、idity 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

16、 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

17、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, hell 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 shal

18、low 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