A NOVEL TECHNIQUE FOR OPTICAL-FIBER PH SENSING BASED ON METHYLENE-BLUE ADSORPTION

被引：70

作者：

DEBOUX, BJC

LEWIS, E

SCULLY, PJ

EDWARDS, R

机构：

[1] Optical Fiber Sensors Research Group, School of Electrical and Electronic Engineering, Liverpool John Moores University, Liverpool L3 3AF, England

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 1995年 / 13卷 / 07期

关键词：

D O I：

10.1109/50.400705

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A novel fiber optic pH sensor is reported. The sensor is based upon surfacic adsorption of methylene blue dye, producing absorption in the evanescent field surrounding the sensing fiber. The sensor is based upon a 200 mu m diameter Plastic Clad Silica (PCS) fiber which has its cladding removed in order to expose its core. The linear range of operation is between pH 3 and pH 9 and its response time is considerably shorter than indicator based probes which measure spectral changes of pH sensitive chemicals. Effects of measurand ionic strength are shown to be negligible which is a further important advantage of this sensor Over other optical fiber pH sensors. The sensor design is sufficiently flexible to allow it to be configured in probe (reflective) or in-line (transmissive) form, The latter allows the application of time domain reflectometry technique which may be used to achieve multipoint (distributed) sensing.

引用

页码：1407 / 1414

页数：8

共 15 条

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