20 December 2013 Ultraprecise measurement of low-coherence interferometry spectrum
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Proceedings Volume 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 90440N (2013) https://doi.org/10.1117/12.2037131
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China
Abstract
A demodulation algorithm for Low-coherence Interferometry is proposed. The demodulation includes a Lithium Niobate wedge, which index is tunable via optics-electric property. This method is based on the theorem that second harmonic term is orthogonal with the fundamental term in Fourier transform. An alternative external electric field is imposed on the wedge and tune the position of Low-coherence Interferometry is proposed. For every point on the CCD camera, the variation of the detected light power is Fourier transformed and obtains the ratio between second-harmonic term and fundamental term. This paper demonstrate theoretically that proposed demodulation method can enhance the accuracy of pressure sensing for more than 35 times.
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Xuezhi Zhang, Tiegen Liu, Junfeng Jiang, Kun Liu, "Ultraprecise measurement of low-coherence interferometry spectrum", Proc. SPIE 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 90440N (20 December 2013); doi: 10.1117/12.2037131; https://doi.org/10.1117/12.2037131
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