Determination of water pH using absorption-based optical sensors: evaluation of different calculation methods

Hongliang Wang; Baohua Liu; Zhongjun Ding; Xiangxin Wang

doi:10.1117/12.2266904

10 February 2017 Determination of water pH using absorption-based optical sensors: evaluation of different calculation methods

Hongliang Wang, Baohua Liu, Zhongjun Ding, Xiangxin Wang

Author Affiliations +

Proceedings Volume 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016); 102502D (2017) https://doi.org/10.1117/12.2266904
Event: Fourth International Conference on Optical and Photonics Engineering, 2016, Chengdu, China

Abstract

Absorption-based optical sensors have been developed for the determination of water pH. In this paper, based on the preparation of a transparent sol–gel thin film with a phenol red (PR) indicator, several calculation methods, including simple linear regression analysis, quadratic regression analysis and dual-wavelength absorbance ratio analysis, were used to calculate water pH. Results of MSSRR show that dual-wavelength absorbance ratio analysis can improve the calculation accuracy of water pH in long-term measurement.

Citation Download Citation

Hongliang Wang, Baohua Liu, Zhongjun Ding, and Xiangxin Wang "Determination of water pH using absorption-based optical sensors: evaluation of different calculation methods", Proc. SPIE 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016), 102502D (10 February 2017); https://doi.org/10.1117/12.2266904

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