Optics-Based Strain Sensing System


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An optics-based strain sensing system is being developed for quazi-distributed strain sensing in locations and environments that are not accessible to conventional strain sensors. The system comprises an Optical Interrogator that has been designed and constructed by Southern Photonics [1], and optical fibre coupled Bragg grating strain sensors. It has been tested using commercial fibre Bragg gratings [2] that were attached to 2 samples of 316 grade stainless steel and cycled in strain and temperature using an Instron mechanical testing machine and temperature controlled cabinet. The results have been compared to the performance of conventional electrical resistance strain gauges. Pairs of fibre Bragg gratings were simultaneously interrogated at 1540 and 1550 nm centre wavelengths to demonstrate the ability of the system to use multiple sensors for quazi-distributed sensing and temperature compensation. The Optical Interrogator resolution is approximately 4 microstrains, accounting for longer term temperature drift, and it is capable of resolving dynamic strains at rates of up to 90 Hz.



Edited by:

B. J. Ruck and T. Kemmitt




K. J. Stevens et al., "Optics-Based Strain Sensing System", Materials Science Forum, Vol. 700, pp. 178-181, 2012

Online since:

September 2011




[1] http: /www. southernphotonics. com.

[2] http: /www. avensys. com.

[3] Fiber Bragg Gratings, R, Kashyap, 1st edition, Academic Press, London (1999).

[4] Fiber Bragg Gratings, A. Othonos and K. Kalli, Artech House, Boston (1999).

[5] Fiber Optic Sensors – An Introduction for Engineers and Scientists, ed. E. Udd, Wiley, (2006).

[6] P. Wagner, Development and characterization of optical strain sensors,. Report for the University of Applied Science, Darmstadt, 11 Feb. (2011).

[7] Y. Cheng, 3D microstructuring inside Foturan glass by femtosecond laser, Riken Review No. 50 (Jan. 2003).

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