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Article Abstract
A low-cost polyethylene terephthalate fluidic sensor (PET-FS) is demonstrated for the concentration variation measurement on fluidic solutions. The PET-FS consisted of a triangular fluidic container attached with a birefringent PET thin layer. The PET-FS was injected with the test liquid solution that was placed in a common path polarization interferometer by utilizing a heterodyne scheme. The measured phase variation of probe light was used to obtain the information regarding the concentration change in the fluidic liquids. The sensor was experimentally tested using different concentrations of sodium chloride solution showing a sensitivity of 3.52 ×10 deg./refractive index unit (RIU) and a detection resolution of 6.25 × 10 RIU. The estimated sensitivity and detection resolutions were 5.62 × 10 (deg./RIU) and 6.94 × 10 RIU, respectively, for the hydrochloric acid. The relationship between the measured phase and the concentration is linear with an R-squared value reaching above 0.995.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8587519 | PMC |
| http://dx.doi.org/10.3390/s21217410 | DOI Listing |
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