Microelectromechanical systems (MEMS) vibratory gyroscopes are used in a wide range of applications. Gyroscopes which have long-term stability and high-reliability even when they are used in harsh environments such as in a wide range of temperatures will be useful for automotive systems and robotics applications.We report a deformation-robust gyroscope, which has three sets of symmetrically arranged folded beams (SAF), which cancel and/or dissipate deformation or internal stress over a wide range of temperatures. In addition, we found that a triangularly supported one-sided open frame by the SAF separated spurious modes from the drive and sensing modes.
A proposed method of secondary phase modulation for open-loop fiber-optic gyroscopes is examined in general terms. To detect the rotation rate of a system through a beat-frequency channel, we employ linearly combined signals with different frequencies for the optical phase modulation. We find that the proper combinations of the modulation frequencies can optimize the sensitivity of gyroscopes. With this method we can employ a high-frequency band for optical phase modulations while keeping relative a lower-frequency band of the detection channel. The theoretically derived result is experimentally confirmed by using a lithium-niobate (LiNbO(3)) optical phase modulator. We also discuss the combination setup with an optical integrated-circuit device and digital signal processing.
Fiber optic gyroscopes (FCGs) are developed for industrial and consumer applications.The bias error, which is determined by electrical circuits rather than the optical system, varies between 0.01 and 36 deg/hr depending on the construction of the electrical system. The scale factor error at each input rate is less than 0.5% in the temperature range of -30 to 85°C. These FOGs are compact, highly reliable, and need only a +12V D.C. power source. They are ready for mass production.
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