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 0.014 degree, and a detection precision of 0.1 degree 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 0.1 degree 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.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 61475085 & 61405105), the Science and Technology Development Project of Shandong Province (No. 2014GGX101007), and the Fundamental Research Funds of Shandong University (No. 2014YQ011).
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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 Sens 7, 27–36 (2017). https://doi.org/10.1007/s13320-016-0335-7
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DOI: https://doi.org/10.1007/s13320-016-0335-7