A fiber bend based humidity sensor with a wide linear range and fast measurement speed

Jinesh Mathew; Yuliya Semenova; Gerald Farrell

doi:10.1016/j.sna.2011.11.029

A fiber bend based humidity sensor with a wide linear range and fast measurement speed

Jinesh Mathew, Yuliya Semenova, Gerald Farrell

School of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

A fast relative humidity sensor is presented which can operate over a wide humidity range, based on a bent single mode optical fiber. We discuss the selection of a suitable hygroscopic coating and also the influence of bend radius on sensor performance. A sensor fabricated using an agarose coating with a bend radius of 16.75 mm shows a linear response in the range 25-90% RH. The measured response time of the sensor is about 50 ms, which is significantly faster than other optical humidity sensors. The humidity sensitivity of the sensor is wavelength dependent and high sensitivity is observed at higher wavelengths. This sensor offers the advantages of simple structure and low cost and its response is reversible in nature.

Original language	English
Pages (from-to)	47-51
Number of pages	5
Journal	Sensors and Actuators, A: Physical
Volume	174
Issue number	1
DOIs	https://doi.org/10.1016/j.sna.2011.11.029
Publication status	Published - Feb 2012

Keywords

Agarose
Humidity sensor
Macro bend
Single mode fiber

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10.1016/j.sna.2011.11.029

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abstract = "A fast relative humidity sensor is presented which can operate over a wide humidity range, based on a bent single mode optical fiber. We discuss the selection of a suitable hygroscopic coating and also the influence of bend radius on sensor performance. A sensor fabricated using an agarose coating with a bend radius of 16.75 mm shows a linear response in the range 25-90% RH. The measured response time of the sensor is about 50 ms, which is significantly faster than other optical humidity sensors. The humidity sensitivity of the sensor is wavelength dependent and high sensitivity is observed at higher wavelengths. This sensor offers the advantages of simple structure and low cost and its response is reversible in nature.",

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A fiber bend based humidity sensor with a wide linear range and fast measurement speed

Abstract

Keywords

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