基于WSN技術(shù)的COD自動檢測系統(tǒng)設(shè)計

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摘要 無線傳感網(wǎng)絡(luò)（WSN）實現(xiàn)了數(shù)據(jù)的采集、處理和傳輸三種功能。它與通信技術(shù)、計算機技術(shù)共同構(gòu)成了信息技術(shù)的三大支柱。無線傳感網(wǎng)絡(luò)在商業(yè)和工業(yè)上被廣泛使用?；瘜W需氧量COD是用來表征水體受還原性物質(zhì)污染程度最常用的一個監(jiān)測指標。國內(nèi)外使用自動化檢測裝置來測量水質(zhì)COD，觀測水環(huán)境狀況。我國水環(huán)境形式不容樂觀，為了改善水環(huán)境質(zhì)量，就必須有先進的科技手段來實現(xiàn)對水污染的監(jiān)測。完善水環(huán)境監(jiān)測網(wǎng)絡(luò)，建立現(xiàn)代化的水環(huán)境監(jiān)測信息系統(tǒng)，設(shè)計安全可靠、智能環(huán)保、測量精度較高的COD自動檢測系統(tǒng)對于保護水環(huán)境具有非常重要的意義。
本文在對比國內(nèi)外檢測儀器特點的基礎(chǔ)上，設(shè)計了基于WSN技術(shù)的COD自動檢測系統(tǒng)，實現(xiàn)了自動測量、自動清洗、無線網(wǎng)絡(luò)傳輸?shù)裙δ堋；舅枷胧峭ㄟ^蠕動泵實現(xiàn)水樣的輸送，通過玻璃管液位計對溶液的體積進行測量，采用封閉消解法對水樣和試劑進行消解反應(yīng)，然后再驅(qū)動雙波長光電檢測裝置測出水質(zhì)測量COD值。同時，可以利用無線傳感網(wǎng)絡(luò)可以對COD檢測系統(tǒng)進行實時監(jiān)控以及COD測量數(shù)據(jù)的實時傳輸。本文重點討論了雙波長光電檢測技術(shù)的工作原理，以及雙波長光電檢測裝置硬件軟件的具體設(shè)計方案。總之，本次設(shè)計提高了以往COD檢測的可靠性和檢測精度，無線傳感網(wǎng)絡(luò)技術(shù)的應(yīng)用方便了數(shù)據(jù)的傳輸，取得了較為理想的測量效果，具有較強的應(yīng)用推廣價值。

關(guān)鍵詞: WSN COD檢測 封閉消解 雙波長光電檢測


The design of COD automatic detecting system based on WSN Technology

Abstract Wireless sensor networks (WSN) has achieved the data collection, processing and transmission of the three functions. It and communication technology, computer technology together constitute the three pillars of information technology. Wireless sensor networks are widely used in the commercial and industrial. Chemical oxygen demand (COD) is a most common monitoring indicator that is used to characterize the degree of water pollution by reducing substances. At home and abroad, automatic detection devices are widely used to measure water COD and observe water environment.China's water environmental situation is not optimistic, in order to improve the water quality of the environment, there must be an advanced technological means to achieve the pollution monitoring. Improve water environment monitoring network, the establishment of modern water environment monitoring information system design safe, reliable, intelligent environmental protection, high precision measurement of COD automatic detection system for the protection of the water environment has a very important significance.
On the basis of comparing detection equipment at home and abroad, COD automatic detection system is designed based on WSN technology, show automatic measurement, automatic cleaning, wireless network transmission and other functions. The basic idea is achieved through the delivery of a peristaltic pump water samples, using a closed digestion of water samples and reagents digestion reaction, driven dual-wavelength photoelectric detection device to measure water quality measured COD values. Meanwhile, you can take advantage of wireless sensor networks for real-time monitoring and measurement system for transferring data. In short, this design improves the detection accuracy and reliability of the previous COD testing, to obtain a more ideal measurement results, therefore it has a strong application value.

Key words WSN COD Detection Closed Digestion Dual-wavelength Photoelectric Detection


目 錄
第一章 緒論 1
1.1 課題研究的背景及意義 1
1.2 WSN技術(shù)的發(fā)展狀況 2
1.3 水質(zhì)中COD的檢測方法 3
1.4 國內(nèi)外COD檢測裝置的現(xiàn)狀 4
1.4.1 國內(nèi)COD檢測裝置發(fā)展狀況 5
1.4.2 國外COD檢測裝置發(fā)展狀況 6
第二章 基于WSN技術(shù)的COD自動檢測系統(tǒng)的總體設(shè)計 9
2.1 無線傳感網(wǎng)絡(luò)設(shè)計方案及分析 9
2.2 COD系統(tǒng)的設(shè)計方案及分析 10
2.2.1進樣計量系統(tǒng) 11
2.2.2 消解系統(tǒng) 12
2.2.3 檢測系統(tǒng) 13
2.2.4 控制系統(tǒng) 14
2.3 COD自動檢測系統(tǒng)的關(guān)鍵技術(shù) 14
第三章 系統(tǒng)硬件整體設(shè)計 18
3.1 無線傳感網(wǎng)絡(luò)方案設(shè)計 18
3.2 COD自動檢測系統(tǒng)整體設(shè)計 19
3.2.1 電源部分 19
3.2.2 主微控制器的選擇 20
3.2.3 數(shù)據(jù)存儲模塊 21
3.2.4液晶顯示模塊 22
3.2.5消解溫度測量模塊 22
3.2.6 數(shù)據(jù)通信接口 23
3.3 雙波長光電檢測裝置 24
3.3.1 雙波長光電檢測系統(tǒng)結(jié)構(gòu) 24
3.3.2 LED光源及驅(qū)動電路設(shè)計 25
3.3.3 光電檢測器件及檢測電路設(shè)計 26
第四章 系統(tǒng)軟件整體設(shè)計 29
4.1 軟件編程環(huán)境 29
4.2 WSN節(jié)點軟件設(shè)計 30
4.3 系統(tǒng)檢測軟件設(shè)計 31
4.4 溫度自動控制軟件設(shè)計 33
4.5 人機界面設(shè)計 35
第五章 總結(jié)與展望 38
5.1 工作總結(jié) 38
5.2 改進與展望 38
致 謝 40
參考文獻 41