Analysis of Temperature Dependence of Thermally Induced Transient Effect in Interferometric Fiber-optic Gyroscopes

Abstract

Thermal characteristics, such as diffusivity and temperature induced change in the fiber mode index of rotation sensing fiber coil are critical factors which determine the time varying, thermo-optically induced bias drift of interferometric fiber-optic gyroscopes (IFOGs). In this study, temperature dependence of the transient effect is analyzed in terms of the thermal characteristics of the fiber coil at three different temperatures. By applying an analytic model to the measured bias in the experiments, comprehensive thermal factors of the fiber coil could be extracted effectively. The validity of the model was confirmed by the fact that the extracted values are reasonable results in comparison with well known properties of the materials of the fiber coil. Temperature induced changes in the critical factors were confirmed to be essential in compensating the transient effect over a wide temperature range.

Discernibly Temperature-insensitive Pressure Sensitivity in Porous Random-Hole Optical Fibers

“…Comparison of the two spectra reveals an interesting feature; namely, that the signal is attenuated under the load condition, with the largest attenuation occurring around 700 nm by more than 3 dB. This loss is due to the fact that when the fiber is compressed by the object, the signal is not tightly confined resulting from the close adherence of the glass material in the pore band and experiences microbending losses [8][9][10]. This phenomenon may be exploited in making pressure sensors with this type of holey fibers [11][12][13][14][15].…”

Influence of parameters of open-loop fiber optic gyro elements on measurement precision

“…Наприклад, автори роботи [1] розробили модель, при-датну для компенсації теплового впливу на оптичну котушку ВОГ, а автори [2] на основі аналітичної моделі котушки ВОГ створили алгоритм компенса-ції температурної похибки. В роботах [3,4] компен-сацію похибок ВОГ проводять на основі алгоритму лінійного прогнозу похибки ВОГ, однак в основі прогнозу лежить врахування впливу температури на волоконний контур.…”

Thermal Sensitivity of Birefringence in Polarization-Maintaining Hollow-Core Photonic Bandgap Fibers

“…After decades of development, FOG has been successfully applied in various fields, including aircraft, satellite navigation, and attitude control [4][5][6][7][8]. The demand for highly stable FOG is growing in applications where the FOG is exposed to complex physical fields, because temperature fluctuations, magnetic fields, and irradiation result in additional non-reciprocal phase drift errors that degrade the stability of the FOG [9][10][11][12]. For a stable FOG, it is crucial to eliminate the effect of temperature fluctuations, which dominate among the factors that induce drift errors.…”