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Proceedings Paper

Light addressable potentiometric sensor phase rapid detection method based on orthogonal detection
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Paper Abstract

The phase detection method of Light-addressable potentiometric sensor (LAPS) can realize accurate detection under the weak light intensity. Now available phase detection method has high algorithm complexity and is difficult to achieve. Aiming at this practical problem, a phase detection method based on orthogonal detection is proposed. This method takes the modulation signal of light source and its orthogonal signal as the reference, multiply with the LAPS signal, respectively. After that extracts the dc component through low-pass filtering and divide. Then could be able to obtain the phase information of the LAPS signal. In this paper, the sensitivity and linearity of H+ detection and the influence of the modulated light intensity on the LAPS detection system are analyzed by orthogonal detection phase detection method. The results show that at the frequency of 4KHz and the detection pH units of 4.00~10.01, with a sensitivity of 60.08 mV/pH and non-linear error of 0.013%, and the modulated light intensity has slight effect on LAPS phase detection. This method has low complexity, high accuracy and excellent sensitivity and linearity for LAPS detection.

Paper Details

Date Published: 20 December 2019
PDF: 6 pages
Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112090C (20 December 2019); doi: 10.1117/12.2542518
Show Author Affiliations
Xiaoguang Yan Sr., Xi'an Univ. of Posts and Telecommunications (China)
Dong Chen Sr., Xi'an Univ. of Posts and Telecommunications (China)
Xingyuan Tong Sr., Xi'an Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 11209:
Eleventh International Conference on Information Optics and Photonics (CIOP 2019)
Hannan Wang, Editor(s)

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