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Digital integrating fiber-optic gyroscope with electronic phase tracking.

K Toyama, K A Fesler, B Y Kim

|September 25, 2009

Summary

This summary is machine-generated.

A new method precisely measures optical phase shifts in interferometers using digital pulses and a closed-loop system. This technique achieves high accuracy for fiber-optic gyroscopes.

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Area of Science:

Optics and Photonics
Optical Engineering
Sensor Technology

Background:

Interferometers are crucial for precise measurements.
Accurate demodulation of optical phase modulation is essential for sensor performance.
Existing methods may have limitations in linearity and accuracy.

Purpose of the Study:

To introduce a novel demodulation scheme for interferometers employing optical phase modulation.
To enhance the precision and linearity of optical phase shift measurements.
To validate the scheme's performance in a fiber-optic gyroscope.

Main Methods:

A novel demodulation scheme mixing square digital pulses with photodetector current.
Utilizing an electronic closed-loop system to adjust pulse spacing for phase tracking.
Implementing a look-up table for correcting minor deviations in phase tracking.

Main Results:

The optical phase shift is tracked with a deviation less than 0.007 radians.
The demodulation scheme demonstrates high accuracy and stability.
An experimental fiber-optic gyroscope showed a linear scale factor consistent with theoretical predictions.

Conclusions:

The novel demodulation scheme offers a precise and reliable method for optical phase shift measurement.
The technique significantly improves the performance of interferometric sensors like fiber-optic gyroscopes.
This approach provides a foundation for advanced optical sensing applications.