Hydrogel-coated fiber Bragg grating sensor for pH monitoring

被引：28
|
作者：
Pabbisetti, Vayu Nandana Kishore [1 ]
Madhuvarasu, Sai Shankar [1 ]
机构：
[1] Natl Inst Technol Warangal, Dept Phys, Warangal 506004, Telangana State, India
来源：
OPTICAL ENGINEERING | 2016年 / 55卷 / 06期
关键词：
fiber Bragg grating sensor; hydrogel; pH sensing; PHOTONIC CRYSTAL FIBER; SWELLABLE POLYMER MICROSPHERES; POLY(ACRYLIC ACID); SENSITIVITY;
D O I：
10.1117/1.OE.55.6.066112
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present a fiber-optic wavelength-modulated sensor for pH applications. Fiber Bragg grating (FBG) is functionalized with a stimulus-responsive hydrogel that induces a strain on FBG due to mechanical expansion of the gel in response to ambient pH changes. The gel is synthesized from the blends of poly (vinyl alcohol)/poly (acrylic acid). The induced strain results in a shift of FBG reflected peak that is monitored by an interrogator. The sensor system shows good linearity in the acidic pH range of 3 to 7 with a sensitivity of 12.16 pm/pH. In addition, it shows good repeatability and oscillator behavior, which proves it to be fit for pH sensing applications. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).
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页数：7
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