An optical fiber pH sensor based on sodium alginate

Wei Wu; Xinyue Huang; Lei Xiaofeng

doi:10.1117/12.2666756

4 April 2023 An optical fiber pH sensor based on sodium alginate

Wei Wu, Xinyue Huang, Lei Xiaofeng

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126176X (2023) https://doi.org/10.1117/12.2666756
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

A fiber optical Mach-Zehnder interferometer sensor for pH sensing has been proposed in this work. Single-Mode Fiber (SMF) and No-Core Fiber (NCF) are symmetrically spliced to form a SMF-NCF-SMF-NCF-SMF Mach-Zehnder interference structure. Sodium Alginate (SA) and Poly (diallyldimethylammonium chloride) (PDDA) are alternatively deposited on the sensing region to form the sensing coating via a Layer-By-Layer (LbL) self-assembly technique. The thickness and morphology of the SA/PDDA sensing coating are characterized by using Scanning Electron Microscopy (SEM). The images showed that uniform, granular, and continuous film with a thickness of 431.7 nm was obtained. The sensor exhibits a liner and fast response in the range of pH 3-9. The sensitivity of sensor is 0.99nm/pH, the response time and the recovery time are 12s and 16s respectively. This indicated that the highly sensitive and good potential for environmental analysis and process control.

Citation Download Citation

Wei Wu, Xinyue Huang, and Lei Xiaofeng "An optical fiber pH sensor based on sodium alginate", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126176X (4 April 2023); https://doi.org/10.1117/12.2666756

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