20xx年電大傳感器與檢測技術(shù)期末考試試題與答案小抄參考-閱讀頁
2024-11-03 11:31本頁面
【正文】 指示溫度為 210℃，后來發(fā)現(xiàn)由于工作上的疏忽把補(bǔ)償導(dǎo)線 BA ??和 ，相互接錯了，問：爐溫的實(shí)際溫度 t 為多少度 ? 解：實(shí)際溫度應(yīng)為 270℃，因為接反后不但沒有補(bǔ)償?shù)?，還抵消了 30℃，故應(yīng)該加上 60℃。 2．壓電式傳感器測量電路的作用是什么 ?其核心是解決什么問題 ? 答：壓電式傳感器測量電路的作用是將壓電晶體產(chǎn)生的電荷轉(zhuǎn)換為電壓信號輸出，其核心是要解決微弱信號的轉(zhuǎn)換與放大，得到足夠強(qiáng)的輸出信號。 解：此加速度計的靈敏度為 091 30 ???K mV/g 標(biāo)定系統(tǒng)框圖如下： 電 壓放 大 器阻 抗變 換 器加 速度 計晶 體 管毫 伏 表 第七章 光電傳感器 1．光電效應(yīng)有哪幾種 ?與之對應(yīng)的光電元件各有哪些 ? 答：光電效應(yīng)有外光電效應(yīng)、內(nèi)光電效 應(yīng)和光生伏特效應(yīng)三種。 2．常用的半導(dǎo)體光電元件有哪些 ?它們的電路符號如何 ? 答：常用的半導(dǎo)體光電元件有光敏二極管、光敏三極管和光電池三種。 答：光敏二極管、三極管及光電池的測量電路如下圖所示。 5．光電傳感器由哪些部分組成 ?被測量可以影響光電傳感器的哪些部分 ? 答： 光電傳感器通常由光源、光學(xué)通路和光電元件三部分組成，如圖所示。光電傳感器設(shè)計靈活，形 式多樣，在越來越多的領(lǐng)域內(nèi)得到廣泛的應(yīng)用。 一是 光源本身是被測物，它發(fā)出的光投射到光電元件上，光電元件的輸出反映了光源的某些物理參數(shù)，如圖 a 所示。如圖 b 所示。反射光的強(qiáng)弱取決于被測物表面的性質(zhì)和狀態(tài)，因此可用于測量工件表面粗糙度、紙張的白度等；四是從恒定光源發(fā)射出的光通量在到達(dá)光電元件的途中受到被測物的遮擋，使投射到光電元件上的光通量減弱，光電元件的輸出反映了被測物的尺寸或位置。這種傳感器可用于工件尺寸測量、振動測量等場合。t do that it will go on and go on. We have to stop it。s celebrations said he wanted to meet Ivory Coast international Toure to discuss his plaint. 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 Islandsbased Webb, the head of Fifa39。s 150th anniversary celebrations and will attend City39。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 City39。s governing body, has also ordered an immediate investigation into the referee39。s plaint. 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 daytoday weather lives. It will climb higher than 專業(yè)好文檔 16 the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ 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 bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。s not needed. Instead, he plans to deploy his 270squarefoot (25squaremeter) 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 won3
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