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Vibration signals produced by defects in motor rolling element bearings contain a series of high-frequency bursts while resonance frequencies are excited by near periodic impacts. For the modulated signals, spectral analysis using direct Fourier transform is not adequate to extract the bearing diagnostic frequencies related to the defect from the resonant frequencies because the crucial bearing diagnostic...
We present a 0.6 mm diameter, 20 μm thick epitaxially-sealed polysilicon disk resonator gyro (DRG). High Q (50,000) combined with electrostatic mode-matching and closed-loop quadrature null performed by dedicated electrode sets enables a scale-factor of 0.286 mV/(°/s) and Angle Random Walk (ARW) of 0.006 (°/s)/√Hz. Without precise control of temperature, the minimum Allan deviation is 3.29 °/hr.
This paper presents a new optic inspection method for detection of defects in the layer of Micro Electro Mechanical Systems (MEMS) after the bonding process. In testing MEMS, a piezo driven vibrator is used to vibrate the MEMS device at its natural resonance frequency in vacuum environment. The amplitude of the vibrated movement of the device is visually recorded and frame of the video is processed...
A new and miniaturized narrow bandpass filter (BPF) with very wide upper stopband is proposed. The filter consists of an open-loop resonator with the broadside coupled microstrip/slot hybrid unit and a microstrip open-loop resonator with short-circuited units, and the two resonators are edge-coupled to improve the performance of the filter. The effective area of designed filter is about 40.4×20 mm...
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