Ivan A Greenwood

Title: The Innovations of Ivan A Greenwood

Introduction

Ivan A Greenwood is a notable inventor based in Stamford, CT (US). He has made significant contributions to the field of optical gyroscopes, holding a total of 7 patents. His work has advanced the technology used in navigation and motion sensing.

Latest Patents

One of Greenwood's latest patents is an optical gyroscope. This invention utilizes a light source signal that is amplitude modulated by a phase-modulated sinusoid. The signal passes through two directional couplers, forming two beams that propagate through an optic-fiber coil in opposite circular directions. An optical phase modulator at one end of the coil introduces a phase modulation of fixed frequency and amplitude to the first beam as it enters the coil and to the counterpropagating beam as it exits. The resulting counterpropagating beams produce a signal at a photodetector that reflects the rotation rate. An electronic control unit connected to the photodetector generates a digital signal output as a frequency, which measures the rotation rate. Additionally, a feedback loop is established by connecting a signal from the control unit to the amplitude-modulated light source to null the phase shift caused by the rotation rate.

Another significant patent is for an auxiliary DC field coil designed to improve the rate bias instability of magnetic resonance gyroscopes. This invention features auxiliary coils mounted adjacent to the coils that produce the DC H.sub.o field for the gyro spin generators. The auxiliary coils create an inhomogeneous H.sub.o field, which reduces rate bias shifts due to readout lamp plasma shifts. Alternatively, these shifts can be minimized by introducing a temperature differential between the two absorption cells used in the gyro.

Career Highlights

Ivan A Greenwood is currently employed at The Singer Company, where he continues to innovate and develop new technologies. His work has been instrumental in enhancing the performance and reliability of gyroscopic systems.

Collaborations

Throughout his career, Greenwood has collaborated with notable colleagues, including James H Simpson and Donald S Bayley. Their combined expertise has contributed to the advancement of various projects and patents.

Conclusion

Ivan A Greenwood's contributions to the field of optical gyroscopes and magnetic resonance gyroscopes have made a lasting impact on technology. His innovative patents and collaborations highlight his dedication to advancing the field of motion sensing and navigation.