Simultaneous Self-Contained Temperature and Angular Velocity Measurement in Interferometric Fiber-Optic Gyroscopes

Interferometric fiber-optic gyroscopes (IFOGs) are sensitive to ambient temperature variations, which can introduce drift in the measured angular velocity. To mitigate such effects, accurate access to real-time temperature information is essential. This article proposes a self-contained multiparameter measurement method that enables simultaneous acquisition of temperature and angular velocity without relying on external sensors. The approach utilizes a multiplexing four-state modulation scheme to embed temperature-related information in the output signal, which is then extracted and used to adjust the signal processing accordingly. Both simulation and experimental results confirm the effectiveness of the proposed method across a wide thermal range, with temperature measurement achieving a root-mean-square error (RMSE) of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.3722~^{\circ } $ </tex-math></inline-formula>C. Temperature correction is carried out using the real-time measured temperature, and experimental results demonstrate improved stability, with the 100-s averaged standard deviation reduced from <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.252~^{\circ } $ </tex-math></inline-formula>/h to <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.023~^{\circ } $ </tex-math></inline-formula>/h by a factor of 10.9, and the maximum deviation suppressed from <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.819~^{\circ } $ </tex-math></inline-formula>/h to <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.097~^{\circ } $ </tex-math></inline-formula>/h by a factor of 8.4. As the method operates entirely within the existing IFOG modulation and detection framework, it offers a practical solution for improving system performance in thermally dynamic environments.