- 期刊
低造價溶氣感測器之研發
Research and Development of Low-Cost Dissolved Oxygen Sensor
摘要
由於水中溶氧量及其變化為判斷任一種水體水質優劣的重要指標之一，尤其是從事生物生產的養殖水體。為了確保水產物的順利收成，養殖過程中建立持續的水質監測系統是必要的；由於水體內溶氧有分佈不均現象，尤其在近底泥層處，因此需要多量的感測器以便進行多處同步監測。然而國內使用之溶氧感測器至今均仰賴國外進口產品，僅感測頭部份的單價即約需0.5~2萬元間，故建立一個養殖空間之監測系統，單在溶氧感測器購入即為一龐大費用；因此本研究探討溶氧感測器的設計與製作原理，研發出低造價溶氧感測器。以電池原理之電氣化學反應作為設計基礎，根據氧化還原反應所產生之電壓大小與水中氧氣量成正比，可推測水中的溶氧量。共探討五個設計變化模組，分別改變電極材料、透氣膜、感測面積、電流導線長度及導線材質等五個變因，共製作約100個感測器，分別求得增氧與耗氧過程之檢量線斜率、相關係數、靈敏度、材料單價等，並以市售美製Oxygard溶氧感測器之資料作為對照組，比較其優缺點，以判斷不同設計模組的特徵及適用性。結果得知，適用的自製低造價溶氧感測器使用電極材料是以Ag+Zn電極組合，透氣膜採用PE保鮮膜，電解液使用1M KCl(下標 (aq))，感測器外殼為委外精緻加工之耐撞硬管材質，以一般電線5(上標 m)長度作為電流導線等組合而成，製作一個感測器的材料成本約為300元。日後，可提供養殖業者不同的產品選擇，且擴大應用至不同水域之溶氧水質監測目的。
並列摘要
In order to ensure the successful cultivation of aquaculture, it is necessary to establish the water quality monitoring system. Because it is often an non-uniform distribution of dissolved oxygen in water quality, we need many sensors to detect the distribution. Since the dissolved oxygen sensor is very expensive, it would cost abundant expenditure to establish a monitoring system for cultivation. Therefore, the study focuses on developing a lower cost dissolved oxygen sensor by using the principle of fabrication and design. The basic principle of a dissolved oxygen sensor is Galvanic cell. The voltages magnitude and the dissolved oxygen is direct ratio according to oxidation-reduction react ion. The study has five factors, which are difference of metal electrode, material of membrane, measured membrane area, wire length and material. Trend line slope, related coefficient, sensitivity, according to increasing oxygen and reducing oxygen process device from experiment obtained, that determined the suitability and characteristic for each factors. Finally, the artificial dissolved oxygen sensor's materials include Ag+Zn electrode, P.E. membrane, KCl solution, manufactured acrylic tube and general wire 5 meter. It cost about NT 300 dollars totally. The results of the study can provide the aquaculture industry more economic products in future and they are applicable to different type of water.