臺灣博碩士論文加值系統

本論文提出一種光波導式酸鹼值感測器用來檢測測試溶液的酸鹼值。此酸鹼值感測器是利用溶液中的酸鹼指示劑，作為光功率的吸收；不同的酸鹼值對光功率的吸收程度不同，由測量光功率的損耗就可以得到相對應的酸鹼值。此感測器以光纖作為光輸入及訊號輸出，可以應用於即時檢測酸鹼值的變化。
本實驗分別量測兩種酸鹼指示劑作為光吸收材料的待測溶液，酸鹼指示劑分別為酚紅，其濃度為50mg/L；酚酞，其濃度為50mg/L，利用光源輸入到光波導感測器測量光功率值。酸鹼指示劑濃度會影響酸鹼值的測量，酚紅濃度每增加"10mg/L" 變化為"0.24μW" ；酚酞濃度的變化為每增加"10mg/L" 變化為"6.5×" 〖"10" 〗^"-2" "μW" ，因此必須控制酸鹼指示劑的濃度，避免無意義的測量。溫度也會改變溶液的酸鹼值，在20°C~60°C的溫度變化，酸鹼值為4的標準溶液，上升0.09pH，每1度約上升"2.25×" 〖"10" 〗^"-3" "pH" ；酸鹼值為7的標準溶液，下降為0.07pH，每1度約下降"1.75×" 〖"10" 〗^"-3" "pH" ；酸鹼值為10的標準溶液，下降為0.28pH，每1度約下降"7×" 〖"10" 〗^"-3" "pH" 。
　　實驗使用LED綠光光源，測量加入酚紅指示劑的待測溶液，並擷取其520nm波長，酸鹼值在pH7-9的光功率變化為"0.5μW/pH" 。測量加入酚酞指示劑的待測溶液，酸鹼值在pH8-11的光功率變化為"7.5×" 〖"10" 〗^"-2" "μW/pH" 。而白光光源(500-1400nm)，測量加入酚酞指示劑的待測溶液，在波長520nm下的酸鹼值在pH6-12的光功率變化為"6nW/pH" ；在波長560nm下的酸鹼值在pH6-12的光功率變化為"13nW/pH" 。

This paper presents an optical waveguide-type pH sensor to detect the pH of the test solutions. This pH sensor uses an acid-base indicator as the absorption of optical power. Measuring optical power loss can get the corresponding pH value, because a different pH value solution has different absorption. This sensor, using optical fibers as the optical input and output can be applied immediately to detect changes in pH values.
In this study, we use two different acid-base indicators as optical absorption materials. There are phenol red and phenolphthalein. The concentrations are all 50mg/L. Optical light of a light source is inputted into optical waveguide-type pH sensor, and the optical power is measured by an optical detector. The concentration of an acid-base indicator can affect pH value. Optical power changes to "0.24μW" as additional increasing of 10mg/L phenol red; and "6.5×" 〖"10" 〗^"-2" "μW" as additional increasing of 10mg/L phenolphthalein. Therefore; to avoid meaningless measurements, we have to control the concentration of acid-base indicator. The temperature also changes the pH value. The changed value is "2.25×" 〖"10" 〗^"-3" "pH/°C" in 20°C~60°C for standard solution of pH4. For standard solution of pH7 and pH10, the changed values are "1.75×" 〖"10" 〗^"-3" "pH/°C" and "7×" 〖"10" 〗^"-3" "pH/°C" , respectively.
Two kinds of light sources are also used to study the pH values. One is LED green light source, and the other is white light source (500~1400nm). The change of optical power is "0.5μW/pH" in pH7-9 for phenol red indicator, and "7.5×" 〖"10" 〗^"-2" "μW/pH" in pH8-11 for phenolphthalein indicator, under the wavelength of 520nm testing. The optical powers vary "6nW/pH" and "13nW/pH" at the wavelength of 520nm, and 560nm, respectively, in pH6-12 where phenolphthalein indicator included.

摘要 i
Absctract ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 viii
第一章 緒論 1
1.1. 前言 1
1.2. pH感測器簡介 1
1.2.1. 金屬/金屬氧化物電極pH感測器 2
1.2.2. 導電聚合物pH感測器 2
1.2.3. ISFET pH感測器 4
1.2.4. 光纖pH感測器 5
第二章 原理 8
2.1. 系統檢測原理簡介 8
2.2. pH值 8
2.3. 酸鹼指示劑 8
2.4. 比爾-朗伯定律 11
第三章 設計與製作 14
3.1. 系統架構與設計 14
3.2. 酚紅吸收曲線 15
3.3. 酚酞吸收曲線 16
3.4. 光纖 18
3.5. 光源1 18
3.6. 光源2 19
3.7. 光頻譜分析儀 20
3.8. pH sensor 21
3.9. 12軸對光調整微移平台 21
第四章 實驗結果與討論 24
4.1. 實驗溶液製作 24
4.2. 酚紅濃度影響 24
4.3. 酚酞濃度影響 25
4.4. 溫度影響 26
4.5. 酚紅實驗結果 28
4.6. 酚紅穩定度與重複性 29
4.7. 酚酞實驗結果 31
4.8. 酚酞穩定度與重複性 31
4.9. 酚酞在白光光源 33
4.10. 酚酞在白光光源的穩定度與重複性 34
第五章 結論與未來研究方向 37
5.1. 酚紅酸鹼指示劑濃度的影響： 37
5.2. 酚酞酸鹼指示劑濃度的影響： 37
5.3. 溫度對pH值影響： 37
5.4. 酚紅在綠光光源的變化： 38
5.5. 酚酞在綠光光源的變化： 38
5.6. 酚酞在白光光源的變化： 38
5.7. 未來工作 38
參考文獻 39
表附錄 41

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