Abstract
We report a strain sensing approach that utilizes wrinkled patterns on poly (dimethylsiloxane) (PDMS) as an optical grating to measure thermally-induced strain of different materials. The mechanism for the strain sensing and the effect of PDMS grating on strain sensing are discussed. By bonding the PDMS grating onto a copper or silicon substrate, the coefficient of thermal expansion (CTE) of the substrates can be deduced by measuring the diffraction angle change due to the change in PDMS grating periodicity when thermal strain is introduced. The measured CTEs agree well with the known reference values.
Original language | English (US) |
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Pages (from-to) | 11994-12001 |
Number of pages | 8 |
Journal | Optics Express |
Volume | 21 |
Issue number | 10 |
DOIs | |
State | Published - May 20 2013 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics