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GÜNDAY, ABDURRAHMAN

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GÜNDAY

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ABDURRAHMAN

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    A method for distributed sensing of temperature, strain and weight formations employing the acoustic velocity and bulk modulus of fused silica
    (Elsevier, 2022-02-01) Günday, Abdurrahman; GÜNDAY, ABDURRAHMAN; Mühendislik Fakültesi; Elektrik Elektronik Mühendisliği Bölümü; AAH-5448-2021
    This investigation presents a novel method for simultaneous measurements of temperature, strain and weight formations depending on Brillouin scattering mechanism exploiting the relations between these measurands and both the acoustic velocity and Bulk modulus of fused silica. To this end, a distributed sensing model has been constructed and the linear and polynomial equations related to the temperature and strain dependencies and sensitivities of acoustic velocity and Bulk modulus have been obtained. Furthermore, utilizing weights suspended at the end of the fiber in the sensing rig used in the model, strain formations occurring along the sensing fiber have been analyzed and second-order formula between strain and weight has been derived. Therefore, about 1 g change of the weight causes ~11 mu epsilon strain variation along the sensing fiber. For weight variations in the range of 0 - 1000 g, weight dependencies of the acoustic velocity and Bulk modulus have been achieved as 0.21 m/s (g)(-1) and 5.77 MPa (g)(-1), respectively. Moreover, weight sensitivities of the acoustic velocity and Bulk modulus in the same range of the weight variations have been computed as ~ -5.76 x 10(-7)%(g)(-1) and ~ -1.11 x 10(-6)%(g)(-1) for the spatial resolution of 1.55 m, respectively.
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    Influence of temperature on detectable minimum rotation rate in i-fogs using er-doped sfss
    (Slovak Univ Technology, 2022-04-01) GÜNDAY, ABDURRAHMAN; YILMAZ, GÜNEŞ; Sağ, Emirhan; Mühendislik Fakültesi; Elektrik ve Elektronik Mühendisliği Bölümü; 0000-0002-2030-4357; 0000-0001-8972-1952; AAH-5448-2021; AAH-4182-2021
    In this study, an interferometric fiber optic gyroscope (I-FOG) model exploiting the double-pass backward (DPB) erbiumdoped superfluorescent fiber source (SFS) with both thin-film filter (TFF) and fiber bragg grating (FBG) reflectors has been constructed and the effects of temperature variations on mean wavelength and detectable minimum rotation rate (DMRR) have been theoretically analyzed. the simulations corresponding with the relations between these parameters for temperature variations in the range of -60 degrees C to + 90 degrees C, have been performed using Matlab 2021b. DMRR variations have been found as 6.01 ppm/K and 3.83 ppm/K for the system with TFF, whilst they are 15.31 ppm/K and 1.58 ppm/K for the system with FBG.