A Coriolis Vibrating Gyro Made of a Strong Piezoelectric Material

Parent, Arnaud; Traon, O. Le; Masson, Stève; Foulgoc, B. Le

doi:10.1109/icsens.2007.4388541

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…We may call this “open loop sensitivity”. This value is comparable with values obtained from other PZT gyroscopes [ 31 ] but is much lower than the values from conventional quartz gyroscopes; this is because the quartz material has a quality factor of

, whereas the PZT material is 75 [ 28 ]. Although a high quality factor is favorable for sensitivity, it is unfavorable for the control input for tuning the device operating frequency.…”

Section: Discussionsupporting

confidence: 81%

Design, Fabrication, and Modeling of a Novel Dual-Axis Control Input PZT Gyroscope

Chang

Chen

2017

Sensors

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Conventional gyroscopes are equipped with a single-axis control input, limiting their performance. Although researchers have proposed control algorithms with dual-axis control inputs to improve gyroscope performance, most have verified the control algorithms through numerical simulations because they lacked practical devices with dual-axis control inputs. The aim of this study was to design a piezoelectric gyroscope equipped with a dual-axis control input so that researchers may experimentally verify those control algorithms in future. Designing a piezoelectric gyroscope with a dual-axis control input is more difficult than designing a conventional gyroscope because the control input must be effective over a broad frequency range to compensate for imperfections, and the multiple mode shapes in flexural deformations complicate the relation between flexural deformation and the proof mass position. This study solved these problems by using a lead zirconate titanate (PZT) material, introducing additional electrodes for shielding, developing an optimal electrode pattern, and performing calibrations of undesired couplings. The results indicated that the fabricated device could be operated at 5.5±1 kHz to perform dual-axis actuations and position measurements. The calibration of the fabricated device was completed by system identifications of a new dynamic model including gyroscopic motions, electromechanical coupling, mechanical coupling, electrostatic coupling, and capacitive output impedance. Finally, without the assistance of control algorithms, the “open loop sensitivity” of the fabricated gyroscope was 1.82 μV/deg/s with a nonlinearity of 9.5% full-scale output. This sensitivity is comparable with those of other PZT gyroscopes with single-axis control inputs.

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, whereas the PZT material is 75 [ 28 ]. Although a high quality factor is favorable for sensitivity, it is unfavorable for the control input for tuning the device operating frequency.…”

Section: Discussionsupporting

confidence: 81%

Design, Fabrication, and Modeling of a Novel Dual-Axis Control Input PZT Gyroscope

Chang

Chen

2017

Sensors

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“…In [Barbour & Schmidt, 2001] authors covered all technologies, that were trending in the early 2000s. There are also quite non-standard developments that are based on completely different principles of gyroscope operation, for example, Maglev gyro [Zhen, et al, 2013], Coriolis Vibrating Gyro (CVG) [Parent, et al, 2007].…”

Section: Introductionmentioning

confidence: 99%

Geodesy, Cartography, and Aerial Photography

Lopatin¹,

Heger²

2021

ISTCGCAP

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The aim of the work is to develop an automated measuring system in a mechanical gyrocompass with the help of specially developed hardware and software in order to facilitate the operation of the device and minimize observer errors. The developed complex provides automation only for the time method, as for the method of the turning point it is necessary to constantly contact the motion screw of the total station. The project is based on an integrated system, the hardware part of which contains a single-board computer, camera, and lens. The main software is a developed motion recognition algorithm with the help of image processing. This algorithm was created using the Python programming language and the open-source computer vision library OpenCV. With the help of the hardware, a video image of the gyroscope's reference scale is obtained, and with the help of the software, the moving light indicator and its position relative to the scale are identified in this image. The result of the study is a functioning automatic measurement system, which determines the value of the azimuth of the direction with the same accuracy as manual measurements. The system is controlled remotely via a computer and wi-fi network. To test the system, a series of automatic and manual measurements were performed simultaneously at the same point for the same direction. Based on the results obtained, it can be stated that the accuracy of the system is within the limits specified by the manufacturer of the device for manual measurements. The application of computer vision technology, namely the tracking of a moving object in the image for gyroscopic measurements can give a significant impetus to the development of automation systems for a wide range of measuring instruments, which in turn can improve the accuracy of measurement results. The developed system can be used together with the Gyromax AK-2M gyrocompass of GeoMessTechnik for carrying out automated measurements, training of new operators. With the help of the developed model, it is possible to avoid gross errors of the observer, to facilitate the measurement process which will not demand the constant presence of the operator near the device. In some dangerous conditions, this is a significant advantage.

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“…The multi-axis motion detection mechanisms rely on various sensing types. It can be piezoelectric [10][11], thermal [12], capacitive [13], piezoresistive [14], etc. However, piezoelectric inertial sensors are being known to offer important advantages compared to their counterparts.…”

Section: Introductionmentioning

confidence: 99%