MEMS gyroscopes are being used in a variety of applications such as camcorders, vehicle stability control and game controllers. Sometimes they are used in harsh environments such as high levels of high-frequency noise. If the frequency of the noise coincides with the natural frequency of the gyroscope, the output of the latter is corrupted. Experiments were performed to demonstrate the effects of noise on MEMS gyroscopes. The focus of this research is to investigate a passive approach to attenuate the effects of noise on MEMS gyroscopes using microfibrous cloth. The candidate materials are made by intermingling and fusing micro metal fibers together using cellulose in wet-lay papermaking technique and sintering of the resulting product to remove the cellulose and bonds the metallic fibers. In this regard, four types of nickel microfibrous material were fabricated using three diameters of nickel fibers. The Delany-Bazley analytical acoustical model was used to determine the optimum acoustical properties of the material. The properties were then used to calculate the absorption coefficients of the microfibrous media. Enclosures were then designed and fabricated from these materials to evaluate the noise attenuation effects on MEMS gyroscopes. Acoustical tests performed in a reverberation room show up to 90% reduction in the amplitude of the effects of noise. The results from simulation modeling and from these experimental evaluations are presented and discussed.

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