Interferometric Fiber Optic Gyroscope

Thermal Sensitivity

Temperature gradients across the optical coil introduce asymmetric changes in the refractive index of the fiber, which creates a false rotation signal. This phenomenon represents a major source of bias drift and requires careful symmetric winding during assembly. Modifying the physical housing or using dual-wavelength sources helps stabilize the sensor against these external thermal fluctuations.

Scale Calibration

Calibration of the scale factor involves rotating the sensor on a precision rate table at known velocities to verify the output linearity. Testing is performed across the entire operating temperature range to map any remaining thermal dependence. The resulting calibration matrix is then stored in the sensor’s non-volatile memory to correct the output in real time.

Precision Threshold

Shot noise from the optical detector sets the fundamental limit on the angle random walk of the sensor. High-performance models minimize this noise by using low-noise superluminescent diodes.