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Regular | Open Access

A portable analog lock-in amplifier for accurate phase measurement and application in high-precision optical oxygen concentration detection

Xi CHEN1, Jun CHANG1( ), Fupeng WANG1, Zongliang WANG2, Wei WEI1, Yuanyuan LIU1, Zengguang QIN1
School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan, 250100, China
School of Physics Science and Information Technology and Shandong Key Laboratory of Optical Communication Science and Technology, Liaocheng University, Liaocheng, 252059, China
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Abstract

A portable analog lock-in amplifier capable of accurate phase detection is proposed in this paper. The proposed lock-in amplifier, which uses the dual-channel orthometric signals as the references to build the xy coordinate system, can detect the relative phase between the input and x-axis based on trigonometric function. The sensitivity of the phase measurement reaches 0.014degree, and a detection precision of 0.1degree is achieved. At the same time, the performance of the lock-in amplifier is verified in the high precision optical oxygen concentration detection. Experimental results reveal that the portable analog lock-in amplifier is accurate for phase detection applications. In the oxygen sensing experiments, 0.058% oxygen concentration resulted in 0.1degree phase shift detected by the lock-in amplifier precisely. In addition, the lock-in amplifier is small and economical compared with the commercial lock-in equipments, so it can be easily integrated in many portable devices for industrial applications.

Keywords

Portable analog lock-in amplifierphase shift measurementhigh accuracyoptical oxygen detection

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Photonic Sensors
Volume 7 Issue 1,
March 2017
Pages 27-36
DOI: 10.1007/s13320-016-0335-7

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Cite this article:
CHEN X, CHANG J, WANG F, et al. A portable analog lock-in amplifier for accurate phase measurement and application in high-precision optical oxygen concentration detection. Photonic Sensors, 2017, 7(1): 27-36. https://doi.org/10.1007/s13320-016-0335-7

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Received: 22 April 2016
Revised: 07 September 2016
Published: 27 October 2016
© The Author(s) 2016.

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.