Fabry-Perot liquid refractive index sensor based on polymethyl methacrylate

Yujie Fu; Lanting Ji; Shuqing Yang; Xiaoxue Bai; Chi Wu

doi:10.1117/12.2625951

27 March 2022 Fabry-Perot liquid refractive index sensor based on polymethyl methacrylate

Yujie Fu, Lanting Ji, Shuqing Yang, Xiaoxue Bai, Chi Wu

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169AK (2022) https://doi.org/10.1117/12.2625951
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Liquid refractive index (RI) is one of the important optical parameters closely related to density, concentration, and temperature. The measurement of liquid RI is widely used in chemistry, medicine, physics, and biology research. A Fabry- Perot interferometer-based liquid RI sensor by using PMMA polymer material is proposed and demonstrated experimentally. The influence of cavity length and reflectivity on the sensor sensitivity is theoretically investigated. A long cavity length gives rise to a small free space range. In the experiment, high reflectivity of F-P cavity is made by evaporating metal film (aluminum film). An open F-P interferometer is realized by punching a hole in the PMMA plate, which is convenient for liquid exchange and in situ measurement. Experimental results show that the FSR the F-P cavity is about 5 nm with a fringe contrast of 3 dB. The designed sensor is compact, low-cost, easy fabrication and flexible replacement. Keywords: Fabry-Perot interferometer, Refractive index sensor, polymethyl methacrylate.

Citation Download Citation

Yujie Fu, Lanting Ji, Shuqing Yang, Xiaoxue Bai, and Chi Wu "Fabry-Perot liquid refractive index sensor based on polymethyl methacrylate", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169AK (27 March 2022); https://doi.org/10.1117/12.2625951

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KEYWORDS

Sensors

Reflectivity

Liquids

Refractive index

Polymethylmethacrylate

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Fabry–Perot interferometers

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