Design details and characterization of all digital closed-loop interferometric fiber optic gyroscope with superluminescent light emitting diode |
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Authors: | O?uz ?elikel Sait Eren San |
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Institution: | (1) Department of Physics, Gebze Institute of Technology (GYTE), 41400 Gebze-Kocaeli, Turkey;(2) TUBITAK (Ulusal Metroloji Enstitüsü) UME Optics Laboratory, Fiber Optic Metrology Division, P.O. Box 54, 41470 Gebze-Kocaeli, Turkey |
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Abstract: | This paper describes the design details and the characterization of an all digital closed-loop (ADCL) interferometric fiber
optic gyroscope (IFOG) Prototype with sine wave biasing modulation and SLED emiting at 1288.9 nm, constructed in TUBITAK UME.
Electronic feedback section of ADCL-IFOG is composed of 16 bit AD7714YN ADC, 14 bit-LTC1667CG DAC, fully controlled and synchronized
by 89C51 microcontroller. The averaged sensitivity of the ADCL-IFOG prototype in unit of error voltage applied to the phase
modulator was calculated as 132.65 μV/(°/h) which equals to a scale factor of 7.53888 (°/h)/mV with a standard deviation of
0.85% for a range of 1–15270 (°/h) rotation rate, corresponding to a range of Sagnac phase shifts varying from 0.00115 to
17.57448 (°). The maximum peak to peak noise and the bias stability of the prototype were determined as 4.97 and 1.48 (°/h)
at 23.0°C, respectively. The variation of the noise and bias stability on a temperature range of 23.0–42.0°C was observed. |
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Keywords: | all digital closed-loop IFOG open-loop IFOG Sagnac phase SLED scale factor bias modulation |
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