傳感器與檢測(cè)技術(shù)中英文獻(xiàn)-免費(fèi)閱讀
【正文】 電容的特征曲線表明，在空間的一段范圍內(nèi)，截面面積和相對(duì)介電常數(shù)的變化與電容量變化成線性關(guān)系。當(dāng)照射在半導(dǎo)體上的光強(qiáng)度增大，金屬電極間的阻抗就會(huì)降低。時(shí) C 的電阻 。 a) bonded strain gauges 耦合應(yīng)變儀 Using an adhesive, these gauges are bonded, or cemented, directly on to the surface of the body or structure which is being examined. 運(yùn)用黏合劑可將應(yīng)變儀與被檢測(cè)的結(jié)構(gòu)或部件的表面粘合或粘牢。觸頭表面的磨損將電位器的壽命限制為多少轉(zhuǎn)。 Potentiometers 電位器 A linear wirewound potentiometer consists of a number of turns resistance wire wound around a nonconducting former, together with a wiping contact which travels over the barwires. The construction principles are shown in figure which indicate that the wiper displacement can be rotary, translational, or a bination of both to give a helicaltype motion. The excitation voltage may be either . or . and the output voltage is proportional to the input motion, provided the measuring device has a resistance which is much greater than the potentiometer resistance. 傳感器與檢測(cè)技術(shù) 031040903 李 素妍 5 Hlsy： 20201012 繞線式電位器由許多繞在非導(dǎo)體骨架的電阻絲以及滑行在線圈上的觸頭組成。 電傳感器可分為兩大類(lèi)。 the presence of the transducer should not alter the measured in any way. c) Size. The transducer must be capable of being placed exactly where it is needed. d) There should be a linear relationship between the measured and the transducer signal. e) The transducer should have minimum sensitivity to external effects, pressure transducers,for example,are often subjected to external effects such vibration and temperature. f) The natural frequency of the transducer should be well separated from the frequency and harmonics of the measurand. a）高保真性：傳感 器輸出波形應(yīng)該真實(shí)可靠地再現(xiàn)被測(cè)量，并且失真很小。然后位移可以改變電參數(shù)，如電壓、電阻、電容或者感應(yīng)系數(shù)。 2020 湖北民族學(xué)院 信息工程學(xué)院 031040903 李素妍 [傳感器與檢測(cè)技術(shù) ] 課程作業(yè) 指導(dǎo)老師：廖紅華 傳感器與檢測(cè)技術(shù) 031040903 李 素妍 1 Hlsy： 20201012 Basic knowledge of transducers A transducer is a device which converts the quantity being measured into an optical, mechanical, ormore monlyelectrical signal. The energyconversion process that takes place is referred to as transduction. 傳感器是一種把被測(cè)量轉(zhuǎn)換為光的、機(jī)械的或者更平常的電信號(hào)的裝置。機(jī)械式和電子式元件合并形成機(jī)電式傳感設(shè)備或傳感器。 b）可測(cè)量最小的干擾，任何時(shí)候傳感器的出現(xiàn)不能改變被測(cè)量。 a） 變參數(shù)型，包括： i） 電阻式； ii） 電容式； iii） 自感應(yīng)式； iv） 互感應(yīng)式； These transducers all rely on external excitation voltage for their operation. b) selfgenerating types,which include i) electromagic ii) thermoelectric iii) photoemissive iv) piezoelectric types 這些傳感器的工作依靠外部電壓。結(jié)構(gòu)原理如圖，觸頭能夠轉(zhuǎn)動(dòng)、直線式運(yùn)動(dòng)或者兩運(yùn)動(dòng)合成的螺旋式運(yùn)動(dòng)。通常指的是生產(chǎn)商在說(shuō)明書(shū)中提及的 “壽命轉(zhuǎn)數(shù) ”，一個(gè)典型值為 20*1000000轉(zhuǎn)。 Examples of bonded gauges are i) fine wire gauges cemented to paper backing ii) photoetched grids of conducting foil on an epoxyresin backing iii) a single semiconductor filament mounted on an epoxyresin backing with copper or nickel leads. 耦合應(yīng) 變儀分為： i)粘合在絕緣紙背后的金屬細(xì)絲儀 ii)在環(huán)氧樹(shù)脂上粘貼導(dǎo)電箔片的光柵 iii） 在環(huán)氧樹(shù)脂上粘貼銅或鎳的半導(dǎo)體絲 Resistance gauges can be made up as single elements to measuring strain in one direction only, or a bination of elements such as rosettes will permit simultaneous measurements in more than one direction. 傳感器與檢測(cè)技術(shù) 031040903 李 素妍 7 Hlsy： 20201012 電阻應(yīng)變儀可作為單個(gè)元件僅在一個(gè)方向測(cè)量應(yīng)力，或者幾個(gè)元件的組合體可在幾個(gè)方向同時(shí)進(jìn)行測(cè)量。
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