AI Article Synopsis
- An optical fiber interferometric refractometer has been developed to measure alcohol gas concentration and low refractive index solutions (RI range of 1.33-1.38).
- The refractometer utilizes a single-mode thin-core structure with an air cavity that enhances sensitivity, especially for alcohol gas concentration.
- The study also explores the impact of cavity size on sensitivity, leading to the introduction of graphene to further enhance detection performance, resulting in high linear sensitivity measurements for different sensor structures.
Article Abstract
An optical fiber interferometric refractometer for alcohol gas concentration and low refractive index (RI) solution (with 1.33-1.38 RI range) measurement is theoretically and experimentally demonstrated. The refractometer is based on a single-mode thin-core single-mode (STS) interferometric structure. By embedding a suitably sized air cavity at the splicing point, high-order cladding modes are successfully excited, which makes the sensor more suitable for low RI solution measurement. The effect of the air cavity's diameter on the sensitivity of alcohol gas concentration was analyzed experimentally, which proved that RI sensitivity will increase with an enlarged diameter of the air cavity. On this basis, the air cavity is filled with graphene in order to improve the sensitivity of the sensor; and the measured sensitivity of the alcohol gas concentration is -1206.1 pm/%. Finally, the characteristics of the single-cavity structure, graphene-filled structure and double-cavity structure sensors are demonstrated, and the linear RI sensitivities are -54.593 nm/RIU (refractive index unit), -85.561 nm/RIU and 359.77 nm/RIU, respectively. Moreover, these sensor structures have the advantages of being compact and easily prepared.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6567200 | PMC |
| http://dx.doi.org/10.3390/s19102319 | DOI Listing |
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