5 January 1990 Interferometric Pressure-Sensing System Using Ion-Exchanged Glass Waveguides
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To implement a pressure transducer for avionic systems, the use of an integrated optic Mach-Zehnder interferometer in glass was considered. A previous study of planar waveguides and the experimental characterization of channel waveguides helped define the fabrication process and select the type of glass substrates to be used. Opto-mechanical stress analysis was used to predict the effect of pressure on waveguides. Phase sensitivity is found to be adjustable with variations in the loading configuration, waveguide path and mode polarization. The behavior of straight channel waveguides under stress was then verified experimentally. A near-zero-phase-imbalance interferometer operating at a wavelength of 810 nm was designed, fabricated and tested. Its intensity modulation response to pressure is stable with good contrast. But in order to directly access the phase modulation information, an imbalanced interferometer was designed for interconnection to a frequency-modulated laser source. Accurate pressure measurement, insensitive to spurious intensity fluctuations, could thus be performed.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
F. Seguin, F. Seguin, E. Johnstone, E. Johnstone, J. Lu, J. Lu, } "Interferometric Pressure-Sensing System Using Ion-Exchanged Glass Waveguides", Proc. SPIE 1177, Integrated Optics and Optoelectronics, (5 January 1990); doi: 10.1117/12.963348; https://doi.org/10.1117/12.963348

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