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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>湖北省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>北京正規(guī)便攜式紅外CO分析儀哪家強(qiáng)</p><p><span>***更新：</span>2020-05-26 13:30:21</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="l8nogxz" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">中船重工安譜（湖北）儀器有限公司</a></p><p><span>聯(lián)系人：</span>李雪</p><p><span>郵箱: </span>lx@hzgli.com</p><p><span>電話: </span>19171399710</p><p><span>傳真: </span>0571_</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>0571-86094492</p><p><span>地址: </span>高新區(qū)蘭臺(tái)路13號(hào)</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="87ryk72" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="kjgi2e3" class="box"><p><p> 中船重工安譜（湖北）儀器有限公司研發(fā)生產(chǎn)的GFC-500A便攜式紅外CO分析儀采用非分光紅外光譜技術(shù)，基本原理是CO分子對(duì)特定紅外光具有吸收效應(yīng)，基本關(guān)系符合Beer-Lambert定律。該儀器通過設(shè)計(jì)穩(wěn)定可靠的多次反射吸收池來提高檢測(cè)靈敏度，并采用氣體濾波技術(shù)增強(qiáng)復(fù)雜環(huán)境下的抗干擾能力。 </p> <p> 非分光紅外氣體濃度探測(cè)技術(shù) ，紅外氣體濃度檢測(cè)基于氣體分子對(duì)紅外光的選擇吸收，即氣體分子只能吸收那些能量正好等于它某兩個(gè)能級(jí)的能量之差的光子。不同氣體分子因?yàn)槠洳煌Y(jié)構(gòu)所決定的不同能級(jí) 而吸收不同頻率的光子。當(dāng)一束紅外光通過充有氣體的氣室時(shí)，氣體分子吸收光能量，吸收關(guān)系遵循Lambert-Beer 定律。如果氣體吸收譜線在入射光源光譜范圍內(nèi)，那么光通過氣體以后，在相應(yīng)譜線處會(huì)發(fā)生光強(qiáng)的衰減。非分光紅外技術(shù)采用單光束雙波長的探測(cè)方法，北京正規(guī)便攜式紅外CO分析儀哪家強(qiáng)。紅外光源發(fā)出單束紅外光通過測(cè)量氣室，北京正規(guī)便攜式紅外CO分析儀哪家強(qiáng)，在探測(cè)器端設(shè)置 2 個(gè)**的探測(cè)單元，且表面附有的濾光片窗口，北京正規(guī)便攜式紅外CO分析儀哪家強(qiáng)，分別為探測(cè)窗口和參考窗口。探測(cè)窗口透射頻帶位于 CO 氣體吸收中心，參考窗口透射頻帶遠(yuǎn)離該區(qū)域且不被其他氣體吸收 </p> <p> <br /> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="北京正規(guī)便攜式紅外CO分析儀哪家強(qiáng)" src="http://tyunfile.71360.com/UploadFile/anpuyq/637127165230781250/5801846.png"></div><p> 在煤礦井下、化工廠、鋼鐵冶金等行業(yè)中都有大量的cO生成，日常生活的天然煤氣也含有大量的cO。特別是當(dāng)井下發(fā)生煤層氣泄漏或在特殊煤層地質(zhì)條件下，可能使礦井CO氣體涌出局部積聚而超標(biāo)，因此檢測(cè)C0對(duì)維護(hù)工業(yè)安全生產(chǎn)、預(yù)防中毒和保障工人生命安全具有重要的意義。本文通過分析cO濃度紅外檢測(cè)技術(shù)原理和方法，給出了其硬件實(shí)現(xiàn)的系統(tǒng)方案。紅外熱釋電紅外探測(cè)器輸出的原始信號(hào)為mv 級(jí)，為了提高測(cè)量精度需要對(duì)信號(hào)進(jìn)行放大和濾波，信號(hào)調(diào)理電路如圖1，由于測(cè)量信號(hào)和參考信號(hào)的調(diào)理電路結(jié)構(gòu)是完全一致的，圖1只給出其中一路的調(diào)理電路，放大器選用‘幾C2254，它具有輸入噪聲小、輸入阻抗高、開環(huán)增益大等特點(diǎn)。輸入信號(hào)首先經(jīng)過隔直電容cl，濾除原始信號(hào)中的受溫度影響較大的直流電壓，得到類似正弦的交流信號(hào)，輸出信號(hào)為一平滑穩(wěn)定的正弦信號(hào)，其直流偏置為事先設(shè)定的+1．65V。． </p> <p> <br /> </p> <p> <br /> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="北京正規(guī)便攜式紅外CO分析儀哪家強(qiáng)" src="http://tyunfile.71360.com/UploadFile/anpuyq/637127161010039062/4427614.png"></div><p> BP神經(jīng)網(wǎng)絡(luò)簡介誤差反向傳播(ErrorBackPropagation，BP)神經(jīng)網(wǎng)絡(luò)是20世紀(jì)80年代中后期由Rumelhart、McClelland等科學(xué)家成立的ParallelDistributedProcession小組提出的[30]，它能學(xué)習(xí)和儲(chǔ)存大量輸入-輸出模式的映射關(guān)系，已經(jīng)證明，BP神經(jīng)網(wǎng)絡(luò)不再局限在處理簡單的線性問題上，更具有實(shí)現(xiàn)任何復(fù)雜的非線性映射的能力，而且無需事前揭示描述這種映射關(guān)系的數(shù)學(xué)模型或方程，特別適合求解內(nèi)部機(jī)制復(fù)雜的問題。解決了多層神經(jīng)網(wǎng)絡(luò)的學(xué)習(xí)問題，極大地促進(jìn)了神經(jīng)網(wǎng)絡(luò)的發(fā)展，成為目前應(yīng)用*****的神經(jīng)網(wǎng)絡(luò)模型之一。在Lambert-Beer定律中的吸收系數(shù)&是一個(gè)非常復(fù)雜的量，它受環(huán)境溫度、壓強(qiáng)、氣體種類、入射光波長等因素的影響，并且是非線性關(guān)系，無法獲得準(zhǔn)確的解析式，如果在測(cè)量co2氣體濃度時(shí)將環(huán)境溫度、壓強(qiáng)等看成理想狀態(tài)，吸收系數(shù)&考慮成定值，貝IJ失去了在實(shí)際應(yīng)用中的意義。與大多數(shù)紅外co2氣體濃度測(cè)量裝置采用**小二乘法對(duì)不同環(huán)境下co2氣體的測(cè)量結(jié)果進(jìn)行直線、多項(xiàng)式或**擬合不同，本論文考慮到BP神經(jīng)網(wǎng)絡(luò)在解決非線性問題上具有獨(dú)特的優(yōu)越性，決定采用這一種新型的建模方案來建立一個(gè)“三輸入-單輸出”模型。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" 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