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

Xiaoguang Yan Sr.; Dong Chen Sr.; Xingyuan Tong Sr.

doi:10.1117/12.2542518

20 December 2019 Light addressable potentiometric sensor phase rapid detection method based on orthogonal detection

Xiaoguang Yan Sr., Dong Chen Sr., Xingyuan Tong Sr.

Proceedings Volume 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019); 112090C (2019) https://doi.org/10.1117/12.2542518
Event: Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 2019, Xi'an, China

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.

Citation Download Citation

Xiaoguang Yan Sr., Dong Chen Sr., and Xingyuan Tong Sr. "Light addressable potentiometric sensor phase rapid detection method based on orthogonal detection", Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112090C (20 December 2019); https://doi.org/10.1117/12.2542518

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KEYWORDS

Modulation

Signal detection

Phase shift keying

Light sources

Control systems

Sensors

Optical sensors

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