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This work presents the parasitic feed-through capacitance in a MEMS capacitive gyroscope with push-pull configuration. The push-pull configuration was adopted for driving the gyroscope resonator differentially to nullify the linear acceleration effect. The drive mode oscillator of the gyroscope was analyzed theoretically and experiments were carried out to quantize the parasitic feed-through level...
In this work, we present a new microfluidic particle-analyzing device with a spatially coplanar-electrode design. To achieve effective particle analysis, 4 coplanar electrodes were designed and fabricated on glass substrates. Different from traditional cross-channel electrodes in impedance sensing, the coplanar design can be achieved without precise alignment issue, which is the major obstacle of...
In most of ionic field-effect bio-sensors currently available in the literature, the major role of flow rectification or switching is played by electrostatic gatings through a single electrode. In this paper, however, we propose a paradigm for ionic field-effect sensing devices, where both the hydrodynamic and the electrostatic behaviors are leveraged by employing a double-gate configuration. Ultrahigh...
Security-conscious users are very careful with software they allow their phone to run. They are much less careful with the choices they make regarding accessories such as headphones or chargers and only few, if any, care about cyber security threats coming from the phone's protective case. We show how a malicious smartphone protective case can be used to detect and monitor the victim's interaction...
To realize a next generation strategy for Japanese agriculture and livestock husbandry, especially aiming at developing a high effective electronic management system for cow rearing farmers. We developed a rumen pH sensor which can implement a real-time monitoring of pH value in cow rumen with low power consumption and high accuracy. The prototype of pH sensor was fabricated and packaged, which can...
Mathematical model of a sensing device based on piezo resonator with changeable electrode gap is further developed. Dependences of resonance frequency and conductivity of the piezoelectric sensing device on parameters of movable electrode formed by a cylindrical surface for which one of hyperbole branches serves as guide are obtained. Grading characteristics in the form of dependence of frequency...
Neuro feedback is a type of biofeedback phenomena that shows the activity on the human brain through Electroencephalogram (EEG). EEG measure the electrical activity of the human brain by electrodes placed on different parts of the brain cortex. Since the human brain has complex circular firing wave patterns, EEG allows us to non-invasively measure the electrical activity of the brain waves. The intensities...
Low-cost sensors to determine aqueous solutions are mostly constructed as an electrochemical cell with a two-electrode-system. Such a two-electrode-system can be realized with multiple geometric arrangements and shapes of the electrodes. The decision which arrangement and shape is best for the current application depends primarily on interference liability. In real applications criteria like producibility,...
In this paper we address the detection of Alzheimer's disease based solely on EEG recordings. We assume that the state of Alzheimer's disease can be described by a latent manifold, captured by the EEG sensors and apply alternating diffusion to reveal this common underlying manifold from multiple EEG sensors. We show that based on a small number of EEG electrodes, a new representation can be obtained,...
Developing MEMS sensors with a high strain sensing range (up to 0.6) and a stepwise sensing mechanism could enable widespread downstream applications, by allowing intimate, mechanically conformable integration with soft biological tissues. Most approaches to date focus on challenges to associate the sensing mechanism with high peak strains under large deformation. By designing and characterizing test...
Artificial neuron is one of the fundamental computing unit in brain-inspired artificial neural network. The standard CMOS based artificial neuron designs to implement non-Unear neuron activation function typically consist of large number of transistors, which inevitably causes large area and power consumption. There is a need for novel nanoelectronic device that can intrinsically and efficiently implement...
Wearable technologies are changing the way we deal with health and fitness in our daily life. Nevertheless, while MEMS-enabled inertial sensors have conquered the consumer market, physiological monitoring has still to face barriers due to the complexity and costs of physical interfaces (e.g. electrodes), the degree of intuitiveness of the interaction and the processing required to reach satisfying...
In this paper, we explore the feasibility of developing a sensor-driven rehabilitation game for people suffering from dysphagia. This study utilizes the skin-like electronics for unobtrusive, comfortable, continuous recording of surface electromyograms (EMG) during swallowing and use them for driving game-based, user-controlled feedback. The experimental study includes the development and evaluation...
This paper presents preliminary experimental results on a novel dual-mass MEMS gyroscope with mechanical amplification of amplitude. A side-by-side comparison between proposed dual-mass and conventional single-mass gyroscopes is presented and the effect of amplitude amplification on the scale factor and noise characteristics is discussed. The dual-mass gyroscope demonstrated a scale factor of 0.465...
As the demand for interactive displays continues to increase, capacitive touch systems (CTSs) with stylus-based drawing have become indispensable [1–4]. Passive styli are widely used because of their low-cost implementation, but have low SNR and limited drawing expressions [1]. Active styli have gained interest to solve these problems [4]. The pressure of an active stylus can be expressed using a...
From the extremely high intensity visible light emitted during an arc flash event, human delicate eye structures may be damaged by the sudden brightness unless appropriate personal protective equipment is worn. Though it is certain that high intensity visible light will be emitted during an arc flash event, there is limited research that provides quantitative light intensity estimation during different...
We report the fabrication and use of carbon fiber (CF) arrays with 8 recording electrodes having individual diameters of 8–10 μm (9–10 times smaller than conventional sensors and state of art) for electrochemical recording of dopamine from deep brain regions in a minimally invasive and high density manner. Accordingly, key advancements demonstrated are (1) radical reduction in size and (2) potential...
CMOS-integrated capacitance based cell sensing has shown promising results for the monitoring cell volume growth. The process utilizes the direct correlation between cell health and measured capacitance. Prior sensors have used charge based capacitance measurement, which has limitations in offset correction, range and resolution. An alternative approach to monitoring small changes in the electrode...
We designed, fabricated, and experimentally demonstrated a dynamically balanced z-axis MEMS vibratory gyroscope utilizing the concentrated suspension architecture. This architecture allows for a high degree of structural symmetry (degeneracy of modes), potentially enabling high precision Rate Gyroscopes (RG) and Rate Integrating Gyroscopes (RIG). The full dynamic balance of the design is enabled by...
This paper reports an improved-sensitivity resonant accelerometer with fishbone-shaped resonators of higher vibration modes. Different from conventional resonant accelerometer integrating with low-order vibrating resonators, our prototype utilizes higher-mode fishbone-shaped resonators based on the principle that higher vibration modes have a higher frequency sensitivity. The proposed fishbone-shaped...
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