HONEYWELL DCS卡件 38001680-100 siemens PLC HONEYWELL DCS 80363969-100 DCS 51304362-350 DCS 51309204-175 /MCTLPA02
HONEYWELL DCS卡件 38001680-100 siemens PLC HONEYWELL DCS 80363969-100 DCS 51304362-350 DCS 51309204-175 /MCTLPA02
HONEYWELL DCS卡件 38001680-100 siemens PLC HONEYWELL DCS 80363969-100 DCS 51304362-350 DCS 51309204-175 /MCTLPA02
電荷耦合器件(Charge-Coupled Device,CCD),又稱圖像傳感器,是一種大規(guī)模集成電路光學(xué)器件,是在MOC集成電路技術(shù)基礎(chǔ)上發(fā)展起來的新型半導(dǎo)體傳感器。
電荷耦合器件的突出特點是以電荷作為信號,而不同于其他大多數(shù)器件是以電流或者電壓為信號。 所以CCD的基本功能是電荷的存儲和電荷的轉(zhuǎn)移。它存儲由光或電激勵產(chǎn)生的信號電荷,當(dāng)對它施加特定時序的脈沖時,其存儲的信號電荷便能在CCD內(nèi)作定向傳輸。CCD工作過程的主要問題是信號電荷的產(chǎn)生,存儲,傳輸,和檢測。
CCD的工作原理:
CCD的尺寸是說感光器件的面積大小,這里就包括了CCD和CMOS.感光器件的面積大小,CCD/CMOS面積越大,捕獲的光子越多,感光性能越好,信噪比越低。CCD/CMOS是數(shù)碼相機(jī)用來感光成像的部件,相當(dāng)于光學(xué)傳統(tǒng)相機(jī)中的膠卷。
CCD上感光組件的表面具有儲存電荷的能力,并以矩陣的方式排列。當(dāng)其表面感受到光線時,會將電荷反應(yīng)在組件上,整個CCD上的所有感光組件所產(chǎn)生的信號,就構(gòu)成了一個完整的畫面。
現(xiàn)在市面上的消費(fèi)級數(shù)碼相機(jī)主要有2/3英寸、1/1.8英寸、1/2.7英寸、1/3.2英寸四種。CCD/CMOS尺寸越大,感光面積越大,成像效果越好。1/1.8英寸的300萬像素相機(jī)效果通常好于1/2.7英寸的400萬像素相機(jī)(后者的感光面積只有前者的55%)。而相同尺寸的CCD/CMOS像素增加固然是件好事,但這也會導(dǎo)致單個像素的感光面積縮小,有曝光不足的可能。但如果在增加CCD/CMOS像素的同時想維持現(xiàn)有的圖像質(zhì)量,就必須在至少維持單個像素面積不減小的基礎(chǔ)上增大CCD/CMOS的總面積。目前更大尺寸CCD/CMOS加工制造比較困難,成本也非常高。因此,CCD/CMOS尺寸較大的數(shù)碼相機(jī),價格也較高。感光器件的大小直接影響數(shù)碼相機(jī)的體積重量。超薄、超輕的數(shù)碼相機(jī)一般CCD/CMOS尺寸也小,而越專業(yè)的數(shù)碼相機(jī),CCD/CMOS尺寸也越大。
如果分解CCD,你會發(fā)現(xiàn)CCD的結(jié)構(gòu)為三層,*層是“微型鏡頭”,第二層是“分色濾色片”以及第三層“感光層”.
APPLIED MATERIALS 0015-00423 BULB,150W,AUXILLARY
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APPLIED MATERIALS 0015-09117 MOTOR THROTTLE VALVE
APPLIED MATERIALS 0015-09123 MODIFIED DIN RAIL SYSTEM AC
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APPLIED MATERIALS 0015-09336 PULLEY,MOD,.2500 BORE, Z
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