本文選題：熒光猝滅法 + 溶解氧　； 參考：《東南大學(xué)》2015年碩士論文

【摘要】：現(xiàn)今,隨著我國對水污染治理問題的日益關(guān)注,檢測水質(zhì)成為其中的一項(xiàng)關(guān)鍵技術(shù)。溶解氧是衡量水質(zhì)的一個(gè)重要指標(biāo),在水污染治理、魚類養(yǎng)殖業(yè)等領(lǐng)域起著十分重要的作用,國內(nèi)外主要的溶解氧檢測方法有三種：碘量法、Clark氧電極法和熒光猝滅法。本文的研究基于熒光猝滅效應(yīng),其目的是設(shè)計(jì)一個(gè)工作性能穩(wěn)定且準(zhǔn)確度較好的溶氧儀測試樣機(jī),主要是完成硬件電路設(shè)計(jì)和軟件數(shù)據(jù)處理算法兩個(gè)方面的工作。測試樣機(jī)由主機(jī)和探頭兩個(gè)部分組成：探頭實(shí)現(xiàn)信號的采集和處理以解算得到水中的溶解氧值和溫度值;主機(jī)實(shí)現(xiàn)人機(jī)交互功能,實(shí)時(shí)顯示溶解氧值。系統(tǒng)硬件電路集成方面的工作主要是實(shí)現(xiàn)主機(jī)與探頭之間的協(xié)同工作以及系統(tǒng)的便攜性要求：主機(jī)與探頭之間的通信,獨(dú)立直流電源的設(shè)計(jì),機(jī)械外殼的設(shè)計(jì)以及程序的固化。同時(shí),為了能夠更簡便的測量出水中的溶解氧,文中對鎖相環(huán)電路檢測熒光壽命進(jìn)行了探討。軟件算法處理的目的是提高測試樣機(jī)的準(zhǔn)確度以及穩(wěn)定性：通過實(shí)驗(yàn)分析得到熒光壽命值、熒光猝滅系數(shù)與水中溫度的函數(shù)關(guān)系,進(jìn)行溫度補(bǔ)償；與標(biāo)準(zhǔn)儀器進(jìn)行對比實(shí)驗(yàn)以調(diào)整測試樣機(jī)完成標(biāo)定工作。文中實(shí)現(xiàn)測試樣機(jī)的溫度補(bǔ)償和標(biāo)定工作后,對測量數(shù)據(jù)進(jìn)行了最后的數(shù)字濾波處理,濾掉隨機(jī)脈沖干擾以及改善測量數(shù)據(jù)的平滑度。最終,測試樣機(jī)的測量精度為0.1mg/L。
[Abstract]:Nowadays, with the increasing concern of water pollution control in China, water quality detection has become one of the key technologies. Dissolved oxygen (do) is an important index to measure water quality. It plays an important role in water pollution control, fish culture and other fields. There are three main dissolved oxygen detection methods at home and abroad: iodine method, Clark oxygen electrode method and fluorescence quenching method. Based on the fluorescence quenching effect, the purpose of this paper is to design a test prototype of oxygen dissolving instrument with stable performance and good accuracy, mainly to complete the hardware circuit design and the software data processing algorithm. The test prototype is composed of two parts: the signal is collected and processed by the probe to calculate the dissolved oxygen value and the temperature value in the water, and the man-machine interaction function is realized by the host computer, and the dissolved oxygen value is displayed in real time. The main work of the system hardware circuit integration is to realize the cooperative work between the host and the probe and the portable requirement of the system: the communication between the host and the probe, the design of the independent DC power supply, the design of the mechanical shell and the solidification of the program. At the same time, in order to measure dissolved oxygen in water more easily, the fluorescence lifetime of PLL circuit is discussed in this paper. The purpose of the software algorithm processing is to improve the accuracy and stability of the test prototype. Through the experimental analysis, the value of fluorescence lifetime, the function relationship between fluorescence quenching coefficient and temperature in water are obtained, and the temperature compensation is carried out. Compare with the standard instrument to adjust the test prototype to complete the calibration work. After the temperature compensation and calibration of the test prototype are realized, the final digital filtering is carried out to filter the random pulse interference and improve the smoothness of the measured data. Finally, the precision of the test prototype is 0.1 mg / L.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X853

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