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A Phase Shift Demodulation Technique: Verification and Application in Fluorescence Phase Based Oxygen Sensors

机译：相移解调技术：在基于荧光相的氧传感器中的验证和应用

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摘要

A phase shift demodulation technique based on subtraction capable of measuring 0.03 phase degree limit between sinusoidal signals is presented in this paper. A self-gain module and a practical subtracter act the kernel parts of the phase shift demodulation system. Electric signals in different phases are used to verify the performance of the system. In addition, a new designed optical source, laser fiber differential source (LFDS), capable of generating mini phase is used to further verify the system reliability. R-square of 0.99997 in electric signals and R-square of 0.99877 in LFDS are achieved, and 0.03 degree measurement limit is realized in experiments. Furthermore, the phase shift demodulation system is applied to the fluorescence phase based oxygen sensors to realize the fundamental function. The experimental results reveal that a good repetition and better than 0.02% oxygen concentration measurement accuracy are realized. In addition, the phase shift demodulation system can be easily integrated to other applications.
机译：本文提出了一种基于减法的相移解调技术，能够测量正弦信号之间的0.03相角极限。自增益模块和实用的减法器充当相移解调系统的内核部分。不同阶段的电信号用于验证系统的性能。此外，采用了一种新设计的光源，即能够产生微型相位的激光光纤差分光源（LFDS），可以进一步验证系统的可靠性。在电信号中实现了0.99997的R平方，在LFDS中实现了0.99877的R平方，在实验中实现了0.03度的测量极限。此外，将相移解调系统应用于基于荧光相的氧传感器以实现基本功能。实验结果表明，该方法具有良好的重复性和优于0.02％的氧浓度测量精度。此外，相移解调系统可以轻松集成到其他应用中。

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