Seawater pH sensor based on the long period grating in a single-mode-multimode-single-mode structure

被引：9
作者：
Wang, Ke [1 ]
Klimov, Denis [1 ]
Kolber, Zbigniew [1 ]
机构：
[1] Monterey Bay Aquarium Res Inst, Moss Landing, CA 95039 USA
来源：
OPTICAL ENGINEERING | 2009年 / 48卷 / 03期
关键词：
long period grating; pH; hydrogel; critical period; FIBERS;
D O I：
10.1117/1.3093625
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A pH sensor is developed based on the long-period grating (LPG) inscribed into a single-mode-multimode-single-mode (SMS) structure in order to measure the pH in seawater. The LPG is formed by using a focused CO2 laser at LPG's critical period (1 mm). The transmission characteristics are similar to that of a multimode fiber. However, the SMS structure has a higher sensitivity because mode coupling only happens between the fundamental mode and higher-order modes in the SMS structure. The pH-sensitive hydrogel is made by the thermal cross-link of poly vinyl alcohol and poly acrylic acid. This sensor has been utilized in seawater pH sensing in the range of 6-8. Experiments have confirmed that the sensor is sensitive and repeatable. c 2009 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3093625]
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页数：4
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