27 May 2011 High pressure measurement by fat long period grating sensor on a single mode optical fiber
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Abstract
We report fabrication of a high pressure optical fiber sensor by using a fat long period fiber grating (FLPFG) for downhole applications. The pressure sensitivity of the bare optical fiber is low so we have designed a mechanical transducer for increasing the pressure sensitivity and possibility of installation the sensor in downhole. The pressure along the longitudinal direction changes the physical characteristic of the FLPFG and result in shifting the resonance wavelength. The FLPFG sensor has been installed on transducer and the pressure sensitivity of the fiber sensor has been measured. Since the temperature changes can affect the FLPFG output, the high pressure vessel was isolated and the temperature was kept constant during the experiment. Pressure sensitivity of the FLPFG sensors has been measured by increasing the pressure from 1500 psi to 10000 psi in steps of 700 psi which is equal to -1.04 pm/psi. With a 10 pm resolution for the wavelength shift detection our OSA, detection limit of our device at room temperature for pressure measurement is calculated to be 10 psi.
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M. I. Zibaii, M. Kheiri, S. Nori, J. Sadeghi, H. Pourbeyram, H. Latifi, M. H. Ghezelaiagh, "High pressure measurement by fat long period grating sensor on a single mode optical fiber", Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 80823I (27 May 2011); doi: 10.1117/12.889044; https://doi.org/10.1117/12.889044
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