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A multi-band operational MEMS microphone inspired by the hearing organ of Ormia ochracea is presented The novel feature is that the device has both integrated capacitive and piezoelectric sensing capability. Similar to our previous designs, the new design works as a bi-directional microphone and has four separate resonance frequencies below 10 kHz, with intended application for human speech recognition...
A new bio-inspired multi-band directional MEMS microphone based on the hearing properties of the fly Ormia ochracea is presented, together with the behavioral influence of 3D-printed housings. The multi-user foundry fabricated microphone operates on four frequency bands, all below 10 kHz and acts as a pressure gradient directional microphone with figure of eight polar pattern, or as an omni-directional...
We report on a new design approach for X-Y symmetric resonator, that can be mechanized as rate (RG) or rate-integrating gyroscope (RIG), with a single digit as-fabricated frequency split between the two mechanical out-of-phase operational modes. We explore concentration of critical mechanical elements (shuttle-spring-anchor modules) close to the center of the die to mitigate the effect of the fabrication...
We propose a room temperature, all electrical driving and detecting, very sensitive bolometer using a doubly clamped microelectromechanical (MEMS) resonator, which can be excited and detected by using piezoelectric effect. The device detects the shift in the resonance frequency caused by heating and works as a very sensitive bolometer. The preliminary device showed a frequency responsivity about 100...
A prompt and accurate bulk system islanding detection capability is essential for real-time operation to maintain system reliability. This paper introduces and proposes two islanding detection methods, “Frequency Standard Deviation” and “Relative Phase Angle Change Rate” based on PMU measurement. The detailed analysis and explanation of the approaches to the design of islanding scheme is provided...
A compact E plane of 10 dB rectangular waveguide directional coupler with different lengths of branch waveguide operating at the center frequency of 340 GHz is presented. The coupler is fabricated using the micro-fabrication technology of deep reactive ion etching (DRIE). The S-parameter is measured by the two-port vector network analyzer and the result is consistent with that of simulation, which...
A dual polarized aperture array consisting of Octagonal Ring Antennas (ORA) operating in the AA-mid frequency range between 400 MHz and 1.4 GHz has been developed for the Square Kilometre Array. A finite array with the aperture size of 1m × 1m had been fabricated. The subarray elements of the finite array are connected to self-developed LNAs or commercially available LNAs. The noise temperature of...
High volume millimeter wave applications are emerging. With the speed improvement of CMOS, sub-millimeter wave operation of CMOS circuits appears to be possible. In traditional millimeter and sub-millimeter wave systems, discrete Schottky diodes are widely utilized. This paper reviews the high frequency performance of junction and Schottky diodes fabricated in CMOS without any process modification,...
In lightweight metal processing, the metal cleanliness is a crucial process parameter for part manufacturing and recycling. On-line ultrasonic methods to evaluate the cleanliness of molten metals by counting the number and measuring the size of inclusions in molten metals are highly desired. In this study, a particle flow simulation system using water has been constructed in order to establish the...
The authors have designed a versatile digital meter for resistivity measurement of biological fluids. Resistivities are measured from 50 to 1600 Omega -cm, and the measuring frequency is manually selected from 10 Hz to 100 kHz. A built-in self-test circuit assures proper operation. The resistivity is displayed on an LCD readout.<<ETX>>
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