Show simple item record

dc.contributor.advisorPratap, Rudra
dc.contributor.authorPatil, Nishad
dc.date.accessioned2007-06-18T09:55:23Z
dc.date.accessioned2018-07-31T05:46:03Z
dc.date.available2007-06-18T09:55:23Z
dc.date.available2018-07-31T05:46:03Z
dc.date.issued2007-06-18T09:55:23Z
dc.date.submitted2006
dc.identifier.urihttps://etd.iisc.ac.in/handle/2005/291
dc.description.abstractDesign and analysis of polysilicon and single crystal silicon gyroscopes have been carried out. Variations in suspension design have been explored. Designs that utilize in-plane and out-of-plane sensing are studied. Damping plays an important role in determining the sense response. Reduction in damping directly affects sensor performance. The various damping mechanisms that are prevalent in gyroscopes are studied. Perforations on the proof mass are observed to significantly reduce the damping in the device when operated in air. The effects of perforation geometry and density have been analyzed. The analysis results show that there is a two orders of magnitude reduction in damping of thick gyroscope structures with optimized perforation design. Equivalent circuit lumped parameter models have been developed to analyze gyroscope performance. The simulation results of these models have been compared with results obtained from SABER, a MEMS specific system level design tool from Coventor-ware. The lumped parameter models are observed to produce faster simulation results with an accuracy comparable to that of Coventorware Three gyroscopes specific to the PolyMUMPS fabrication process have been designed and their performance analyzed. Two of the designs sense motion out-of-plane and the other senses motion in-plane. Results of the simulation show that for a given damping, the gyro design with in-plane modes gives a resolution of 4◦/s. The out-of-plane gyroscopes have two variations in suspension. The hammock suspension resolves a rate of 25◦/s in a 200 Hz bandwidth while the design with folded beam suspension resolves a rate of 2◦/s in a 12 Hz bandwidth. A single crystal silicon in-plane gyroscope has been designed with vertical electrodes to sense Coriolis motion. This design gives an order of magnitude higher capacitance change for a given rotation in comparison to conventional comb-finger design. The effects of process induced residual stress on the characteristic frequencies of the polysilicon gyroscopes are also studied. The in-plane gyroscope is found to be robust to stress variations. Analysis results indicate that the tuning fork gyroscope with the hammock suspension is the most susceptible to compressive residual stress, with a significant drop in sensitivity at high stress values.en
dc.language.isoen_USen
dc.publisherIndian Institute of Science
dc.rightsI grant Indian Institute of Science the right to archive and to make available my thesis or dissertation in whole or in part in all forms of media, now hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.
dc.subjectMicroelectromechanical Systemsen
dc.subjectDetectorsen
dc.subjectGyroscopesen
dc.subjectDampingen
dc.subjectEquivalent Circuit Modelen
dc.subjectSimulink Modelen
dc.subjectSABER Validationen
dc.subjectSingle Crystal Silicon (SCS) Gyroscopeen
dc.subjectMEMS Gyroscopeen
dc.subjectGuided Beamen
dc.subjectPolysilicon Gyroscopeen
dc.subjectPolyMUMPS Fabricationen
dc.subject.classificationElectronic Engineeringen
dc.titleDesign And Analysis Of MEMS Angular Rate Sensorsen
dc.typeThesisen
dc.degree.nameMSc Enggen
dc.degree.levelMastersen
dc.degree.grantorIndian Institute of Science
dc.degree.disciplineFaculty Of Engineeringen


Files in this item

This item appears in the following Collection(s)

Show simple item record