Long period grating-based refractive index sensor for chloride concentration measurement

C. Chung Chun Lam; M. Rajesh; T. Sun; K. T. V. Grattan; S. K. T. Grattan; S. E. Taylor; P. A. M. Basheer

doi:10.1117/12.786552

16 May 2008 Long period grating-based refractive index sensor for chloride concentration measurement

C. Chung Chun Lam, M. Rajesh, T. Sun, K. T. V. Grattan, S. K. T. Grattan, S. E. Taylor, P. A. M. Basheer

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70045M (2008) https://doi.org/10.1117/12.786552
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

Effective devices for the monitoring of chloride ions are required in industry this work reports on the development of a reflective long period grating-based senor for the measurement of chloride ions in solution. The device is based around a long period fibre grating (LPG)-based Michelson interferometer where the sensor was calibrated and evaluated in the laboratory using sodium chloride solutions, over a wide range of concentrations, from 0.01 M to 4.00 M. The grating response yields shifts in the spectral characteristic of the interferometer, due to the change of refractive index of the solution surrounding it. The work was stimulated by the need for the more effective measurement of the ingress water-borne ions in structural concrete. It was found that the sensitivity of the device could be enhanced over that obtained from a bare LPG by coating the LPG-based interferometer with gold nanoparticles. Devices using this approach were also evaluated and their performance cross-compared.

Citation Download Citation

C. Chung Chun Lam, M. Rajesh, T. Sun, K. T. V. Grattan, S. K. T. Grattan, S. E. Taylor, and P. A. M. Basheer "Long period grating-based refractive index sensor for chloride concentration measurement", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70045M (16 May 2008); https://doi.org/10.1117/12.786552

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