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href="http://www.cdcfah.com/cp/first-_yiqiyibiao/">儀器儀表</a>?<a href="http://www.cdcfah.com/cp/second-yiqiyibiao_gxyq/">光學(xué)儀器</a>?<a href="http://www.cdcfah.com/cp/third-gxyq_gpygdj/">光譜儀、光度計(jì)</a>?化工紫外可見分光光度計(jì)賣價推薦咨詢上海儀電分析儀器供應(yīng)</p><div id="3asol7a" class="leftbox clearfix"><h1>化工紫外可見分光光度計(jì)賣價推薦咨詢上海儀電分析儀器供應(yīng)</h1><div id="xwdf3qc" class="proBig"><div id="i2rl8t8" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="ktqxura" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="apbtash" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>化工紫外可見分光光度計(jì)賣價,紫外可見分光光度計(jì)</p><p><span>***更新：</span>2020-11-16 00:28:34</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="wlgtfh7" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海儀電分析儀器有限公司</a></p><p><span>聯(lián)系人：</span>薛馬駿</p><p><span>郵箱: </span>ydfxwx@qq.com</p><p><span>電話: </span>18001994173</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.inesa-a.com</p><p><span>手機(jī): </span>021-34530361</p><p><span>地址: </span>徐塘路88號7幢4層、9幢</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="lubdpbl" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="2xoqc7m" class="box"><p>紫外可見分光光度計(jì)的基本結(jié)構(gòu) <p> 紫外可見分光光度計(jì)的工作原理是由光源發(fā)出連續(xù)輻射光，化工紫外可見分光光度計(jì)賣價，經(jīng)單色器按波長大小色散為單色光，單色光照射到吸收池，一部分被樣品溶液吸收，未被吸收的光經(jīng)檢測器的光電管將光強(qiáng)度變化轉(zhuǎn)變?yōu)殡娦盘栕兓⒔?jīng)信號顯示系統(tǒng)調(diào)制放大后，顯示或打印出吸光度A（或透射比T），完成測定。 </p> <p> 一、光源 </p> <p> 光源是提供符合要求的入射光的裝置，紫外可見分光光度計(jì)可見光區(qū)常用的光源為鎢燈，紫外光區(qū)常用的光源為氫燈或氘燈。 </p> <p> 1.1．鎢燈 </p> <p> 鎢燈是常用的可見光光源，它可發(fā)射的波長為325~2500nm的連續(xù)光譜，其中適宜的使用波長范圍為320~1000nm，因此，也可用做近紅外光源。電能將鎢燈加熱到白熾時，發(fā)出的光強(qiáng)度在各波段的分布隨燈絲溫度而變化。燈絲的溫度取決于電源電壓。電源電壓的微小波動都會引起鎢光強(qiáng)度的很大變化。因此必須使用穩(wěn)壓電源供電，鎢燈工作電壓為12V，也可以使用12V的直流電源供電。鎢燈的壽命一般可達(dá)10000小時以上。 </p> <p> 目前很多光度計(jì)采用鹵鎢燈代替鎢燈，如7230G型，化工紫外可見分光光度計(jì)賣價、752PLUS型分光光度計(jì)等，化工紫外可見分光光度計(jì)賣價。鹵鎢燈具有較高的發(fā)光效率和較長的使用壽命。分光光度計(jì)是杜包斯克(Duboscq)和奈斯勒(Nessler)等人在1854年將朗伯-比爾定律應(yīng)用于定量分析化學(xué)領(lǐng)域。化工紫外可見分光光度計(jì)賣價</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="化工紫外可見分光光度計(jì)賣價,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594874577336/8128483.png"></div><p> 紫外可見分光光度計(jì)的發(fā)展分光光度法在分析領(lǐng)域中的應(yīng)用已經(jīng)有數(shù)十年的歷史，至今仍是應(yīng)用常用的分析方法之一。隨著分光元器件及分光技術(shù)、檢測器件與檢測技術(shù)、大規(guī)模集成制造技術(shù)等的發(fā)展，以及單片機(jī)、微處理器、計(jì)算機(jī)和DSP技術(shù)的應(yīng)用，分光光度計(jì)的性能指標(biāo)不斷提高，并向自動化、智能化、高速化和小型化等方向發(fā)展。 </p> <p> 在分光元器件方面，經(jīng)歷了棱鏡、機(jī)刻光柵和全息光柵的過程，商品化的全息閃耀光柵已迅速取代一般刻劃光柵。在儀器控制方面，隨著單片機(jī)、微處理器的出現(xiàn)以及軟硬件技術(shù)的結(jié)合，從早期的人工控制進(jìn)步到了自動控制。在顯示、記錄與繪圖方面，早期采用表頭(電位計(jì))指示、繪圖儀繪圖，后來用數(shù)字電壓表數(shù)字顯示，如今更多地采用液晶屏幕或計(jì)算機(jī)屏幕顯示。在檢測器方面，早期使用光電池、光電管，后來更普遍地使用光電倍增管甚至光電二極管陣列。陣列型檢測器和凹面光柵的聯(lián)合應(yīng)用，使儀器的測量速度發(fā)生了質(zhì)的飛躍，且性能更加穩(wěn)定可靠，受到儀器用戶的青睞，在儀器構(gòu)型方面，從單光束發(fā)展為雙光束，現(xiàn)在幾乎所有高級分光光度計(jì)都是雙光束的，有些高精度的儀器采用雙單色器。環(huán)保紫外可見分光光度計(jì)生產(chǎn)廠家紫外分光光度計(jì)一般覆蓋190nm和380nm波長，通常利用氘燈照明。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="化工紫外可見分光光度計(jì)賣價,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396594849245086/5585171.png"></div><p> 使用紫外可見分光光度計(jì)時需要注意哪些方面？ </p> <p> 1、使用的吸收池必須潔凈，并注意配對使用。量瓶、移液吸管均應(yīng)校正、洗凈后使用。 </p> <p> 2、取吸收池時，手指應(yīng)拿毛玻璃面的兩側(cè)，裝盛樣品以池體的4/5為度，使用揮發(fā)性溶液時應(yīng)加蓋，透光面要用擦鏡紙由上而下擦拭干凈，檢視應(yīng)無溶劑殘留。吸收池放入樣品室時應(yīng)注意方向相同。用后用溶劑或水沖洗干凈，晾干防塵保存。 </p> <p> 3、供試品溶液濃度除各該品種已有注明外，其吸收度以在0.3～0.7之間為宜。 </p> <p> 4、測定時除另有規(guī)定外，應(yīng)以配制供試品溶液的同批溶劑為空白對照，采用1cm石英吸收池，在規(guī)定的吸收峰±2nm以內(nèi)，測幾個點(diǎn)的吸收度或由儀器在規(guī)定的波長附近自動掃描測定，以核對供試品的吸收峰位置是否正確，并以吸收度MAX的波長作為測定波長，除另有規(guī)定外吸收度MAX波長應(yīng)在該品種項(xiàng)下規(guī)定的測定波長±2nm以內(nèi)。 </p> <p> 5、供試品應(yīng)取2份，如為對照品比較法，對照品一般也應(yīng)取2份。平行操作，每份結(jié)果對平均值的偏差應(yīng)在±0.5%以內(nèi)。 </p> <p> 6、選用儀器的狹縫寬度應(yīng)小于供試品吸收帶的半寬度，否則測得的吸收度值會偏低，狹縫寬度的選擇應(yīng)以減少狹縫寬度時供試品的吸收度不再增加為準(zhǔn)，對于大部分被測品種，可以使用2nm縫寬。<span style="display:none;"></span> </p><p style="text-indent:25px">紫外分光光度計(jì)檢測器是將光信號轉(zhuǎn)變?yōu)殡娦盘柕难b置。測量吸光度時，并非直接測量透過吸收池的光強(qiáng)度，而是將光強(qiáng)度轉(zhuǎn)換成電流進(jìn)行測量，這種光電轉(zhuǎn)換器件稱為檢測器，又叫接受器。常用的檢測器有光電池、光電管、光電倍增管及光電二極管陣列檢測器等。光電池價格便宜，但長時間曝光，會使靈敏度降低。光電管的靈敏度比光電池高；光電倍增管不*靈敏度比普通光電管高，而且響應(yīng)速度快，目前中、高性能分光光度計(jì)中一般采用它作為檢測器。光電二極管陣列檢測器是紫外可見分光光度計(jì)檢測的一個重要進(jìn)展。為了測量吸光值，分光光度計(jì)制造商通常使用光電倍增管（photo-multiplier tubes，PMTs）和光敏二極管。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="化工紫外可見分光光度計(jì)賣價,紫外可見分光光度計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><p> 光譜范圍紫外可見光譜區(qū)通常指190nm～780nm的波長范圍，但實(shí)際的分光光度計(jì)設(shè)計(jì)中，經(jīng)常將波長向長波方向拓展，進(jìn)入短波近紅外區(qū)。在120多種國外產(chǎn)品中，有52種波長≤900nm，其中≤800nm的*11種。而>900nm的有72種，占了多數(shù)。固定光柵型受硅陣列探測器的限制，1100nm是其波長的上限。掃描光柵型使用分立光電器件，波長的擴(kuò)展更為靈活。 </p> <p> 波長的準(zhǔn)確性：*有16種偏差超過1nm，其余大多在01～1之間。其中突出的是Varian的Cary100/300，它們在6561nm處的波長準(zhǔn)確性達(dá)到了002nm的水平。波長重復(fù)性大于05nm的*7種，01～05nm之間的占了多數(shù)，共有68種，還有相當(dāng)數(shù)量的產(chǎn)品達(dá)到了優(yōu)于01nm的水平。如Agilent的8453(002)、Beckman的DU7000series(005)、Camspec的M400T/PC(005)、GBC的Centra10/20/40(004)、Hitachi的U3010/3310(005)、PerkinElmer的Lambda系列(002～005)、ScincoCO的S-1100/3130/3150(002)、Shimadzu的MS1500(001)和UV1201(003)、Varian的Cary系列(0008～0025)等。雖然從原理上，固定光柵型的設(shè)計(jì)結(jié)構(gòu)固定、簡單，易于實(shí)現(xiàn)好的波長準(zhǔn)確性和重復(fù)性，但掃描光柵的設(shè)計(jì)制造工藝已十分成熟。紫外分光光度計(jì)儀器使用一定周期后，由維修工程師或在工程師指導(dǎo)下定期開啟儀器外罩對內(nèi)部進(jìn)行除塵工作。化工紫外可見分光光度計(jì)賣價</p><p style="text-indent:25px">紫外可見分光光度計(jì)在開機(jī)前將樣品室內(nèi)的干燥劑取出，儀器自檢過程中禁止打開樣品室蓋?；ぷ贤饪梢姺止夤舛扔?jì)賣價</p><p style="text-indent:25px">國統(tǒng)局?jǐn)?shù)據(jù)顯示，2019年上半年儀器儀表大行業(yè)規(guī)模以上企業(yè)4927個，營收規(guī)模4002億元，營收同比增長7.57%；收入總額為361億元，同比增長2.87%，比主營收入低4.70個百分點(diǎn)；一些中低檔產(chǎn)品已具有規(guī)模優(yōu)勢和國際市場競爭力。中國已成為分光光度計(jì)，氣相色譜，原子吸收，食品安全等產(chǎn)品的生產(chǎn)和出口大國，其他儀器設(shè)備等產(chǎn)品的出口也開始取得突破。儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷售，計(jì)算機(jī)軟件開發(fā)及銷售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營活動】儀器儀表、電子元器件及相關(guān)的系統(tǒng)集成的生產(chǎn)、服務(wù)及銷售，計(jì)算機(jī)軟件開發(fā)及銷售，從事貨物進(jìn)出口及技術(shù)進(jìn)出口業(yè)務(wù)?！疽婪毥?jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營活動】產(chǎn)品普遍運(yùn)用于工業(yè)、農(nóng)業(yè)、交通、科技、環(huán)保、**、文教衛(wèi)生、大家生活等各個領(lǐng)域，在旺盛市場需求的帶動下和我國宏觀調(diào)控政策的引導(dǎo)下，我國儀器儀表行業(yè)的發(fā)展有了長足的進(jìn)步空間。儀器儀表在工業(yè)發(fā)展中具有重要作用，這也使得儀器儀表得到快讀發(fā)展。各行各業(yè)對儀器儀表的市場需求也在不斷提升，銷售企業(yè)正在發(fā)展中尋求技術(shù)創(chuàng)新和質(zhì)量提升。儀器儀表的質(zhì)量、性能關(guān)系到工業(yè)安全，必須重視?；ぷ贤饪梢姺止夤舛扔?jì)賣價</p><p style="text-indent:25px">上海儀電分析儀器有限公司專注技術(shù)創(chuàng)新和產(chǎn)品研發(fā)，發(fā)展規(guī)模團(tuán)隊(duì)不斷壯大。公司目前擁有專業(yè)的技術(shù)員工，為員工提供廣闊的發(fā)展平臺與成長空間，為客戶提供高質(zhì)的產(chǎn)品服務(wù)，深受員工與客戶好評。誠實(shí)、守信是對企業(yè)的經(jīng)營要求，也是我們做人的基本準(zhǔn)則。公司致力于打造***的分光光度計(jì)，氣相色譜，原子吸收，食品安全。公司深耕分光光度計(jì)，氣相色譜，原子吸收，食品安全，正積蓄著更大的能量，向更廣闊的空間、更寬泛的領(lǐng)域拓展。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2003790.html</p></div></div></div></div></div><div id="zjln2jv" class="page-right twoColRt"><div id="rl7h88j" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="g3gd7yj" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="zoqnuli" class="recomPic 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