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研究生:張日綱
研究生(外文):ZHANG,RI-GANG
論文名稱:電介質電容式之非侵入液位檢測
論文名稱(外文):Non-invasive liquid level detection with dielectric capacitive method
指導教授:尤芳銘
口試委員:黃志鵬尤芳銘卓國文李再成
口試日期:2012-07-16
學位類別:碩士
校院名稱:聖約翰科技大學
系所名稱:電腦與通訊工程系碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:55
中文關鍵詞:液體準位量測液體量測
外文關鍵詞:liquidlevel measurementliquid measurement
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目前在液體準位偵測上已有許多的研究,但大多數皆為侵入式或接觸式的偵測,其必須將偵測裝置放入液體中,故有可能因接觸面產生電化學變化而改變液體本身的本質或產生汙染現象,對於安全性液體如醫療用的液體則不適用於此種偵測方法,故本論文提出一種電介質電容式之非侵入液體準位偵測的方法與裝置,無須進行物理量的取樣,其過程使用微小的電場不至於破壞系統的結構與狀態,能即時且連續性研究物質內部的訊息,克服光學上渾濁樣品或有色樣品的量測限制,且在偵測時不影響待測液體的本質,可用於醫療性液體或隔離性與危險性的液體,此方法解決了侵入式或接觸式偵測方式所造成的不安全性問題。
本論文所提出的偵測原理,使用叉指式交錯電極感測液體之電介質所造成等效電容的變化,得知相關液體準位高低之輸出電壓大小值,而液體的準位高低形成其介質接觸感測板面積的大小變化,故可由輸出電壓值得知相關液體準位的高低。其架構裝置為振盪電路的信號源接於叉指式交错電極感測裝置的一側,其另一側經濾波及整流電路後產生峰值的輸出電壓。
本論文的實驗先量測同濃度的液體在不同準位時的輸出電壓值,得知輸出值大小與準位高低成線性比例的規律性關係,其次實驗同準位之不同濃度時的同種液體其輸出電壓值,得知皆在固定電壓範圍內折線變化之現象,為溶解物之分子團的結合與極性方向大小所影響,最後觀察不同液體的輸出變化,得知阻抗與相位差有所不同的表現之特徵區別。
由本實驗結果可得知在液體每增加單位高度下呈現線性等量變化,且本實驗架構簡單、低功率1.2mw(供給3V/0.4mA)、體積小(99.7mm*19.5mm*2.2mm)及成本低廉,在感應液體方面線性效果明顯,藉由各種不同的電介質可從其相位差及衰減量得知不同的液體種類,用於產業可提供一種無汙染、無化學反應的液體準位偵測方法,且此技術為絕緣式的低電壓隔離探測,安全可靠不會有漏電、電擊或引燃爆炸的危險產生,展望未來可和網路結合做線上監測節省人力、水資源管理、農業灌溉管理、灑水系統管理...等各方面的應用。

Have been many studies on the liquid level detection, but most are invasive or contact detection, it must detect the device into the liquid, it is possible electrochemical changes due to the contact surface change the nature of the liquid itself, or pollution phenomena security liquids such as liquid for medical use does not apply to such detection methods, this paper presents a dielectric capacitive non-invasive liquid level detection method and device, without physical sampling process uses a tiny electric field does not destroy the structure and state of the system, immediate and continuous research material within the message, to overcome the measurement limit of optically turbid samples or colored samples in the detection does not affect the nature of the liquid under test can be used for medical liquids or isolation and the risk of liquid, this method to solve the insecurity problem caused by the intrusive contact detection methods.
The proposed detection principle, the use of the interdigital type staggered electrode sensing liquid dielectric caused by the equivalent capacitance changes, that the liquid level size of the output voltage level of value, while the liquid quasi-bit level of the formation of medium contact with the sensor board area the size of the change, it may be the output voltage is worth to know related to the liquid level in the level. Its structure device connected to the source of the oscillation circuit interdigital staggered one side of the electrode sensing devices, the other side through the filter and rectifier circuit, the output voltage of the peak.
In this thesis, the first experimental measurements of the same concentration of the liquid in the different level when the output voltage value, to know the size of the output value and level height is linearly proportional to the regularity of relationship, followed by the experiments of the same species in different concentrations of the same level liquid, its output voltage value, that are within the range of fixed voltage line changes in the phenomenon, affected by the combination of the molecules of the solute and the size of the polarity, and finally observed the change of the output of different liquids, that the impedance and the phase difference be the difference between the different performance characteristics.
Can be learned by the experimental results of the linear equal amount of change in the height of the liquid for each additional unit, and the simple structure of this experiment, the low power of 1.2mW (supply 3V/0.4mA), small size (99.7mm * 19.5mm *2.2mm) and cost low, linear effect in the induction of liquid from the phase difference and attenuation to know the different types of liquid through a variety of different dielectric for industry can provide a non-polluting, no chemical reaction of the liquid level detection method, and this technology for the insulation of low voltage isolation detection, safe and reliable will not have leakage, electric shock or ignite an explosion hazard arose, Looking to the future and network combination for online monitoring to save on labor, water management, agricultural irrigation management sprinkler systems management and all aspects of the application.

論文摘要 I
英文摘要 III
目錄 VI
圖目錄 VIII
表目錄 X
第一章 緒論 1
1.1 研究動機與目的 1
1.2 文獻回顧 3
1.3 研究方法 5
1.4 實驗方法與實驗結果 5
1.5 論文架構 7
第二章 電容式非侵入液位偵測系統原理與分析 9
2.1 電容 9
2.1.1 導體、絕緣體與半導體 9
2.1.2 電容器介紹 9
2.1.3 影響電容的因素 12
第三章 實驗方法與系統架構 16
3.1 實驗設備、儀器與材料 16
3.2 實驗方法與實驗架構 19
第四章 實驗量測結果 26
4.1 相同濃度不同高度之液體實驗 26
4.2 不同濃度相同高度之液體實驗 27
4.3 阻抗和相位差觀察不同液體 28
第五章 結論與未來展望 31
附件 簡介感測器轉換原理與輸出形體 32
0.1 感測器 32
0.2 感測器的分類 33
參考文獻 38


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