Other

University of Michigan

Kulah, Haluk

Ozyurt Okutucu, Tuba

Koyuncuoglu, Aziz

Ciftlik, Ata Tuna

Haluk Kulah

Ata Tuna Ciftlik

Ozge Zorlu

Khalil Najafi

Tayfun Akin

Mehmet Serhan Ardanuc

Nebil Goksu

Levent Beker

Mustafa Kangul

Eren Aydin

Furkan Gokce

Aziz Koyuncuoglu

Tuba Ozyurt Okutucu

A method of an open loop characterization of an electrostatic MEMS based resonator with a varying gap, the method including: converting, via a trans-impedance amplifier circuit, an output current signal of the resonator into a voltage; multiplying the output current signal converted into the voltage, by means of a multiplier circuit, with an AC signal or with a different signal at a frequency of the resonator and carrying a second harmonic signal to a main tone; and measuring a frequency response of a signal cleared of frequencies apart from the main tone using a network analyzer.

Characterization and driving method based on the second harmonic, which is enhancing the quality factor and reducing the feedthrough current in varying gap electrostatic MEMS resonators

This invention is related with electrical energy conversion device, which uses built-in potential of metal-to-metal junctions from repeating movements with random frequencies, speeds and amplitudes at the medium of the device. The device using the method does not rely on a resonant frequency, besides, it can convert the kinetic energy to electrical energy even at low frequencies. Furthermore, its application to the real life situations is economic and beneficial because of the efficient working principle and simple structure. Unique design of the device enables direct wiring of the outputs of identical or similar devices together for the purpose of power scaling without the need of using another device, which may cause energy losses and increase the total cost. This device also does not require a dummy voltage source or a precharge at the beginning of energy harvesting.

Method of energy harvesting using built-in potential difference of metal-to-metal junctions and device thereof

The invention is related to a totally implantable cochlear implant having a transducer which is a piezoelectric vibration energy harvester to be mounted on the ossicular chain or the tympanic membrane to detect the frequency of oscillations and generate the required voltage to stimulate the relevant auditory nerves. The invention enables patients' continuous access to sound, since it eliminates the outside components of conventional cochlear implants. The invention also eliminates the problem of battery need, since the transducer generates voltage required to stimulate auditory nerves from the vibrations of ossicular chain. The transducer is fabricated using Microelectromechanical Systems (MEMS) fabrication techniques. The invention incorporates of two main parts, a transducer acting both as a frequency detector and an energy harvester, and electrodes to stimulate the auditory nerve inside the cochlea.

Energy harvesting cochlear implant

This dielectrophoretic micro cell chromatography device with concentric electrodes and spiral microfluidic channels, produced according to MEMS technology subject to this invention; is composed of 4 groups of effect electrodes, inlet electrodes, spiral zone and central span, having exterior upper electrode (), interior sub electrode with 3D geometry (), upper inlet electrode (), sub inlet electrode (), spiral zone (), central span (), constant reading point and Insulating wafer () as the main components.

Dielectrophoretic cell chromatography device with spiral microfluidic channels and concentric electrodes, fabricated with MEMS technology

Laterally oscillating gravimetric sensing device embeddable under micro-fluidic channels and fabricated with micro-electro mechanical systems (MEMS) technology, which detects biological cells and analytes by measuring the change of mass attached on its surface is composed of four main groups, namely a resonator that can be placed onto the basis of the channel, components of the resonator bio-activation, a micro fluidic channel, and the microfabrication techniques, and its main components are the proof mass (), comb fingers fixed to proof mass (), folded spring beams (), channel floor and mechanical soil (), stationary electrodes (), comb fingers attached to the stationary electrodes (), golden film deposited onto the mass (), immobilized biologic recognition molecules (), and micro fluidic channel placed on resonator structure ().

Microfluidic-channel embeddable, laterally oscillating gravimetric sensor device fabricated with micro-electro-mechanical systems (MEMS) technology

A method and a micro power generator for generating electrical power from low frequency, vibrational energy includes a frequency up-conversion process. The generator is preferably an electromagnetic, vibration-to-electrical power generator which can efficiently scavenge energy from low frequency external vibrations. The generator up-converts low frequency environmental vibrations to a much higher frequency through a mechanical frequency up-converter, and hence provides efficient energy conversion even at low frequencies. This mechanical frequency up-conversion process can be realized in a number of ways. A magnetic method is described as an example. After frequency up-conversion, voltage is induced on coils mounted on resonators by electromagnetic induction. Due to the movement of the coils on their respective resonating cantilevers with respect to the magnet, voltage is generated on the coils and energy conversion is realized.

Method and micro power generator for generating electrical power from low frequency vibrational energy

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Ankara, Turkey

Haluk Kulah