光纖浸液體感測器及光纖浸液體偵測系統FIBER-OPTIC SENSOR FOR LIQUID-IMMERSION DETECTION AND FIBER-OPTIC DETECTION SYSTEM FOR LIQUID-IMMERSION DETECTION

專利類型

發明

專利國別 (專利申請國家)

美國

專利申請案號

13/287,107

專利證號

US 8,731,342 B2

專利獲證名稱

光纖浸液體感測器及光纖浸液體偵測系統FIBER-OPTIC SENSOR FOR LIQUID-IMMERSION DETECTION AND FIBER-OPTIC DETECTION SYSTEM FOR LIQUID-IMMERSION DETECTION

專利所屬機關 (申請機關)

淡江大學學校財團法人淡江大學

獲證日期

2014/05/20

技術說明

所提出的反射式光纖感測器主要是由一般8度斜角APC端面光纖連接器及一塊透水-漫射反射材料，例如：美耐皿海綿（Melamine Sponge）。光纖連接頭APC端面與美耐皿海綿構成一個感測介面，因為美耐皿海綿本身內部結構的關係，乾與濕會讓APC端面與美耐皿海綿的介面處呈現不同的狀態，乾的接面因未浸水，內部結構較為乾燥也比較粗糙，產生任意角度漫射現象，因此讓反射光回到光纖的機率變大，OTDR所量到的脈衝高度(Pulse-Height)也隨之變高。然而，濕的美耐皿海綿因浸水後變得較綿密且呈現平滑光亮面，在APC端面與濕美耐皿海綿的介面處則呈現鏡面反射，因此APC端面8度斜角造成反射光不易返回到光纖內而產生較大損耗，OTDR所量到的脈衝高度也就下降了。在此美耐皿海綿扮演兩個重要角色：雜質濾水器及光波散光器(Lightwave Diffuser)。 The proposed reflective-type fiber-optic sensor is mainly made up of an FC connector with an 8-degree angled physical contact (APC) and a piece of permeable material with diffuse reflection such as melamine sponge. After water immersion, they instantly change into the specular reflection at this boundary. Owing to the diffuse reflection at the dry boundary, the pulse-height measured by the OTDR becomes higher while the incident light backscattered into the fiber becomes larger. However, under water immersion the wet boundary results in specular reflection; and the 8-degree APC end facet can largely suppress the reflected light back to the optical fiber, which leads to a large return loss to the sensor and reduces the pulse-height shown on OTDR. Here, the melamine sponge plays two key roles as a water impurity filter and a lightwave diffuser.

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連絡單位 (專責單位/部門名稱)

研究發展處

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26215656分機2561

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