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Vol. 174, Issue 7, July 2014, pp. 29-35

 

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Research of the Emulsion Concentration Sensor Based on the Long Period Fiber Grating
 

Baishun SU

School of computer science and technology, Henan Polytechnic University, Jiaozuo, 454000, China
Tel.: 0391-3987726, fax: 0391-3987726

E-mail: subaishun@163.com

 

 

Received: 20 April 2014 /Accepted: 30 June 2014 /Published: 31 July 2014

Digital Sensors and Sensor Sysstems

 

Abstract: The Emulsion is a hydraulic support's transmission medium and its concentration directly affects the working life and cost of the hydraulic support and the pillar, so strict testing for emulsion concentration is necessary. Aiming to the common methods of the emulsion concentration detection and development current situation of the fiber grating refractive index sensing technology at home and abroad, This paper puts forward a new detecting methods of emulsion concentration by the long period fiber grating and analyze long period fiber grating’s influential factor on the transmission spectrum on the basis of the coupled-mode theory. Finally the relationship between emulsion concentration and refractive index be get by Sensing characteristics and experiment with the characteristics of the refractive index of the emulsion, This wavelength-modulated optical fiber grating sensor has the characteristics of the simple structure, high sensitivity, anti-electromagnetism interference and corrosion resisting, which can realize the online inspection of the emulsion concentration. Test of the long period fiber grating shows that long period fiber grating can realize the emulsion detection and meet the sensitivity requirement. Transmission wavelength‘s change has good linear relationship with surrounding refractive index.

 

Keywords: Long period fiber grating, Emulsion, Resonance wavelength, Transmission spectra, Refractive index.

 

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