Abstract
A strain profile measurement technique using a chirped fibre Bragg grating (CFBG) sensor by implementing an integration of differences (IOD) method is reported in this paper. Using the IOD method the spatial distribution of strain along the length of the CFBG is extracted from its power reflectance spectra. As a proof of concept demonstration, the developed technique is applied to measure the polymerisation shrinkage strain profile of a photo-cured polymer dental composite which exhibits a non-uniform strain distribution attributed to the curing lamp characteristics. The result from the CFBG technique is compared with that of an FBG array embedded in the dental composite and is correlated with the degree of conversion of the material which also depends on the curing lamp intensity distribution. This technology will have significant impact and applications in a range of medical, materials and engineering areas where strain or temperature gradient profile measurement is required in smaller scales.
Highlights
A strain profile measurement technique using a chirped fibre Bragg grating (CFBG) sensor by implementing an integration of differences (IOD) method is reported in this paper
Direct FBG peak wavelength shift compensation alone cannot be used to discern between temperature and strain effects and a temperature compensation technique would be needed to eliminate this spike, which is not considered in this study
A maximum of 200 με difference is observed in the polymerisation shrinkage (PS) strain between the two experiments which could be due to the difference in the embedment depth of the CFBG
Summary
A strain profile measurement technique using a chirped fibre Bragg grating (CFBG) sensor by implementing an integration of differences (IOD) method is reported in this paper. The result from the CFBG technique is compared with that of an FBG array embedded in the dental composite and is correlated with the degree of conversion of the material which depends on the curing lamp intensity distribution. This technology will have significant impact and applications in a range of medical, materials and engineering areas where strain or temperature gradient profile measurement is required in smaller scales. The true and real-time shrinkage mapping of polymer biomaterials and the subsequent understanding of the PS evolution across the material and its dependence on the curing excitation method or material composition is still an unsolved problem. To transition further into the spatial PS regime, FBG arrays are u sed[17], but it is not viable to scale up the number of FBGs since the excess optical fibres in the materials would affect the characteristics properties of the material itself
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