High-Speed Measurement of Refractive Index Using Dielectric Multilayer Films Deposited on Optical Fiber End

被引:0
|
作者
Kim, Kyung-Su [1 ]
Mizuno, Yosuke [1 ]
Nakamura, Kentaro [1 ]
机构
[1] Tokyo Inst Technol, Precis & Intelligence Lab, Yokohama, Kanagawa 2268503, Japan
来源
22ND INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS, PTS 1-3 | 2012年 / 8421卷
关键词
Band-pass filter; dielectric multilayer films; optical fiber sensor; refractive index sensor; high-speed measurement; HIGH-SENSITIVITY; SENSOR; GRATINGS;
D O I
10.1117/12.974464
中图分类号
TP7 [遥感技术];
学科分类号
081102 ; 0816 ; 081602 ; 083002 ; 1404 ;
摘要
We have recently developed a refractive index (RI) sensor using a band-pass filter (BPF) composed of dielectric multilayer films deposited on an optical fiber end. An optical spectrum analyzer was, however, conventionally employed in this sensor to obtain the reflection wavelength, which limited the total measurement speed due to its second-order sweep time. In this study, we enhance its measurement speed by use of a high-speed demodulator where the optical wavelength information is converted into electrical voltage using the linear slopes of the reflection spectra. The response time of the sensor, which is influenced by the dynamic behavior of the sample liquid, is found to be as short as several tens of micro-seconds. We also compare its RI sensitivity with that of a simple Fresnel-based RI sensor.
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页数:4
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