The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Yoshinori Matsumoto - One of the best experts on this subject based on the ideXlab platform.
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low voltage charge balanced capacitance voltage conversion circuit for one side Electrode Type fluid based inclination sensor
Solid-state Electronics, 2009Co-Authors: Asrulnizam Abd Manaf, Yoshinori MatsumotoAbstract:Abstract A low voltage detection circuit for a capacitance sensor is important for connection to a low voltage digital circuit interface. We studied two different charge-balanced capacitance–voltage (C–V) conversion circuits configurations; the operational amplifier and the inverter amplifier. Both capacitance detection circuits were designed using 0.35 μm CMOS circuitry technology. Both amplifiers used in the detection circuits were not affected by offset voltage. The current consumption for capacitance detection circuit was reduced from 250 μA at Vdd 3.3 V to 38 μA at Vdd 1.3 V by switching from an operational amplifier to an inverter amplifier. These circuits were packaged with one-side-Electrode-Type fluid-based inclination sensors on ceramic substrates. The size of the sensor is ∅ 4.0 mm × 1.0 mm and pure propylene carbonate was used as electrolyte. Changes in temperature did not affect the output voltage of the sensor between −10 °C and 50 °C. This results show that the inverter amplifier used in the detection circuit was not affected by offset voltage and the output voltage Vm is depends only on capacitor ratio. The capacitance detection circuit using the inverter amplifier shows a high-sensitivity of about 7 mV/deg over the operational amplifier at Vdd 1.3 V. The response time, resolution and minimum moving angle of sensor were 0.7 s, 0.86° and 0.4°, respectively, at Vdd 1.3 V for the inverter amplifier Type of capacitance detection circuit.
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characterization of miniaturized one side Electrode Type fluid based inclinometer
Sensors and Actuators A-physical, 2008Co-Authors: Asrulnizam Abd Manaf, K Nakamura, Yoshinori MatsumotoAbstract:Abstract In this study, electrical double-layer theory is applied to realize a one-side-Electrode-Type fluid-based inclinometer combined with complementary metal oxide semiconductor (CMOS) circuitry. Substrate penetration lithography was applied in the fabrication of high-aspect-ratio SU-8 container molds, and molds with heights 1.0 mm were fabricated. Polydimethylsiloxane (PDMS) was used as the container material, and Electrodes were fabricated on a ceramic substrate. Considering the electrical double-layer property, low surface tension, the dielectric constant and the problem of volatilization, methanol and propylene carbonate were tested as electrolytes. A charge-balanced capacitance–voltage ( C – V ) conversion circuit was designed as a detection circuit for this sensor and it was fabricated using 0.35 μm CMOS technology. The sensor part and detection circuit were integrated in one ceramic packaging for realize a miniaturization of inclination sensor system. To overcome the surface tension of the PDMS surface, silicone oil was injected in the container to cover the entire inner surface so that the movement of solution in the container became smooth. The linearity of the analog output of ±60° inclination for container dimensions of O 4.0 mm × 1.0 mm (diameter × thickness) was less than 6%/F.S. The minimum moving angle and response time were 0.4° and 0.9 s, respectively, when propylene carbonate was used as the electrolyte. The change in temperature did not affect the output voltage of the sensor between 0 and 50 °C. The effect of vibration was demonstrated in this paper.
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one side Electrode Type fluid based inclinometer combined with cmos circuitry
IEEE Sensors, 2007Co-Authors: Bin Abd A Manaf, K Nakamura, J Onishi, Yoshinori MatsumotoAbstract:In this study, electrical double layer theory is applied to realize one-side-Electrode-Type fluid-based inclinometer combined with CMOS circuitry. Charge-balanced capacitance-voltage conversion (C-V converter) circuit was designed as detection circuit and it was fabricated using 0.35 mum CMOS process. The sensor design and substrate penetration lithography method are demonstrated in sensor fabrication, and experiment to find a proper fluid for this application was implemented.
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Low voltage charge-balanced capacitance-voltage conversion circuit for one-side-Electrode-Type fluid-based inclination sensor
2007 International Semiconductor Device Research Symposium, 2007Co-Authors: A. Bin Abd Manaf, Yoshinori MatsumotoAbstract:Low voltage detection circuit for capacitance sensor is important to connect low voltage digital circuit interface. We demonstrated two configuration Types of charge-balanced capacitance-voltage (C-V) conversion circuit by using operational-amplifier (op-amp) and inverter-amplifier (inv-amp). These circuits were packaged with one-side-Electrode-Type fluid- based inclination sensor on ceramic substrate. Performances of these circuits were evaluated. This inclination sensor system could be combined with digital circuit by the inv- amp charge-balanced C-V conversion circuit at Vdd = 1.3 V.
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Development and evaluation of capacitance detection ASIC for three-axis common Electrode Type capacitive accelerometer
IEEJ Transactions on Sensors and Micromachines, 2001Co-Authors: Yoshinori Matsumoto, Shoji Kawahito, Makoto IshidaAbstract:A capacitance detection CMOS ASIC has been developed for three-axis common Electrode Type capacitive accelerometers. The ASIC contains an analog output switched capacitor circuit and a digital output 2nd order deltasigma modulator. The circuits were driven by three or six phase clocks for three-axis detection. The characteristics of the circuits were evaluated by a variable capacitor and a three-axis capacitive accelerometer. A novel compensation method was proposed to reduce the sensitivity dependence on Z-axis acceleration. The three-axis output voltages of the switched capacitor circuits were proportional to three-axis accelerations. The offset and sensitivity of the 2nd order delta-sigma modulator can be calibrated by outer voltages. The sensitivities of 1.5V/G and 20kHz/G were obtained respectively when the circuits were combined with a commercial available three-axis capacitive accelerometer.
Asrulnizam Abd Manaf - One of the best experts on this subject based on the ideXlab platform.
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One-Side-Electrode-Type Fluidic-Based Capacitive Pressure Sensor
IEEE Sensors Journal, 2015Co-Authors: Mohd Norzaidi Mat Nawi, Asrulnizam Abd Manaf, Mohamad Faizal Abd Rahman, Mohd Rizal Arshad, Othman SidekAbstract:This paper presents the development of a novel one-side-Electrode-Type fluidic-based capacitive pressure sensor. A pressure sensor using a one-side-Electrode and an implementation of electrical double layer capacitance concept was proposed. Mechanical analysis of the membrane was carried out using the finite-element analysis in terms of deflection and Mises stress. A sensor with a circular membrane radius of 3.2 mm, membrane thickness of 0.8 mm, microchannel thickness of 0.5 mm, and microchannel width of 0.5 mm was fabricated using polydimethylsiloxane. The validation was made between the analytical and experimental results for fluid mechanisms inside the sensor. This showed that the displacement for all Types of liquid, including methanol, ethanol, and silicon oil was linearly aligned. Methanol was chosen as an electrolyte due to its liquid properties, such as low surface tension and dielectric permittivity. From the experimental results, the operating frequency, response time, and sensitivity of the sensor were 1.2 kHz, 0.12 s, and 0.77 pF/kPa, respectively. The effects of vibration, temperature, and lifetime were also discussed in this paper.
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One side Electrode Type fluidic based capacitive pressure sensor
2013 IEEE SENSORS, 2013Co-Authors: Mohd Norzaidi Mat Nawi, Asrulnizam Abd Manaf, Mohamad Faizal Abd Rahman, Mohd Rizal Arshad, Othman SidekAbstract:This paper presents the novel fluidic based capacitive pressure sensor. The electrical double layer capacitor (EDLC) concept was applied as a sensing method. The methanol was selected as an electrolyte due to its liquid properties such as low surface tension and dielectric permittivity. The circular membrane and microchannel were fabricated using PDMS material and the one side Electrode was fabricated on the printed circuit board (PCB). PDMS was used as an insulator on the Electrode to allow the formation of the ionic layer. The value of capacitance depends on the liquid movement inside the microchannel. The result of membrane deflections for PDMS membrane with dimension 2.8mm×2.8mm×1.5mm deviated compared to the simulation where it was assumed that the simulation model is was linear. From the experimental results, the operating frequency, response time and sensitivity of the sensor were 1.2 kHz, 0.21 s and 0.033 pF/kPa, respectively.
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low voltage charge balanced capacitance voltage conversion circuit for one side Electrode Type fluid based inclination sensor
Solid-state Electronics, 2009Co-Authors: Asrulnizam Abd Manaf, Yoshinori MatsumotoAbstract:Abstract A low voltage detection circuit for a capacitance sensor is important for connection to a low voltage digital circuit interface. We studied two different charge-balanced capacitance–voltage (C–V) conversion circuits configurations; the operational amplifier and the inverter amplifier. Both capacitance detection circuits were designed using 0.35 μm CMOS circuitry technology. Both amplifiers used in the detection circuits were not affected by offset voltage. The current consumption for capacitance detection circuit was reduced from 250 μA at Vdd 3.3 V to 38 μA at Vdd 1.3 V by switching from an operational amplifier to an inverter amplifier. These circuits were packaged with one-side-Electrode-Type fluid-based inclination sensors on ceramic substrates. The size of the sensor is ∅ 4.0 mm × 1.0 mm and pure propylene carbonate was used as electrolyte. Changes in temperature did not affect the output voltage of the sensor between −10 °C and 50 °C. This results show that the inverter amplifier used in the detection circuit was not affected by offset voltage and the output voltage Vm is depends only on capacitor ratio. The capacitance detection circuit using the inverter amplifier shows a high-sensitivity of about 7 mV/deg over the operational amplifier at Vdd 1.3 V. The response time, resolution and minimum moving angle of sensor were 0.7 s, 0.86° and 0.4°, respectively, at Vdd 1.3 V for the inverter amplifier Type of capacitance detection circuit.
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characterization of miniaturized one side Electrode Type fluid based inclinometer
Sensors and Actuators A-physical, 2008Co-Authors: Asrulnizam Abd Manaf, K Nakamura, Yoshinori MatsumotoAbstract:Abstract In this study, electrical double-layer theory is applied to realize a one-side-Electrode-Type fluid-based inclinometer combined with complementary metal oxide semiconductor (CMOS) circuitry. Substrate penetration lithography was applied in the fabrication of high-aspect-ratio SU-8 container molds, and molds with heights 1.0 mm were fabricated. Polydimethylsiloxane (PDMS) was used as the container material, and Electrodes were fabricated on a ceramic substrate. Considering the electrical double-layer property, low surface tension, the dielectric constant and the problem of volatilization, methanol and propylene carbonate were tested as electrolytes. A charge-balanced capacitance–voltage ( C – V ) conversion circuit was designed as a detection circuit for this sensor and it was fabricated using 0.35 μm CMOS technology. The sensor part and detection circuit were integrated in one ceramic packaging for realize a miniaturization of inclination sensor system. To overcome the surface tension of the PDMS surface, silicone oil was injected in the container to cover the entire inner surface so that the movement of solution in the container became smooth. The linearity of the analog output of ±60° inclination for container dimensions of O 4.0 mm × 1.0 mm (diameter × thickness) was less than 6%/F.S. The minimum moving angle and response time were 0.4° and 0.9 s, respectively, when propylene carbonate was used as the electrolyte. The change in temperature did not affect the output voltage of the sensor between 0 and 50 °C. The effect of vibration was demonstrated in this paper.
Olfat Mohammed - One of the best experts on this subject based on the ideXlab platform.
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Repeatability of wire and surface Electrodes in gait.
American journal of physical medicine & rehabilitation, 2003Co-Authors: Ross Bogey, Kay Cerny, Olfat MohammedAbstract:Muscle forces are not directly measurable without invasive methods (i.e., tendon force transducers). Techniques such as dynamic electromyography are therefore required to obtain insight into the role of muscles during motion. There is controversy about the choice of recording Electrode Type. Surface Electrodes are noninvasive and allow recording over a large area yet may allow intramuscular crosstalk. Indwelling Electrodes also have been used in gait analysis. This Electrode Type is able to analyze the electrical activity of small or deep muscles. Despite the advantages of intramuscular Electrodes for some applications, this Electrode Type is often rejected because of the need for skin penetration and for specialized personnel to acquire the data. The reliability of the wire electromyographic signal has also been questioned. The objective of this study was to determine if there were differences in the test-retest reliability of surface vs. intramuscular Electrodes in gait analysis. Surface and intramuscular electromyographic data were obtained from the soleus muscle in 18 adults with no history of neuromuscular disease as they performed self-selected speed walking. A statistical criterion (variance ratio) was used to measure the reproduction of phasic patterns of muscle activity with both wire and surface Electrodes on repeat-day testing of the soleus muscle. Each Electrode Type was remarkably consistent. Mean variance ratio values for wire Electrodes (mean = 187) were slightly lower than mean surface electromyographic variance ratio values (mean = 199). These differences did not approach statistical significance (P = 0.768). The study results show that the dynamic electromyographic signal obtained with wire Electrodes is, at minimum, as repeatable as surface electromyograms.
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Repeatability of wire and surface Electrodes in gait.
American Journal of Physical Medicine & Rehabilitation, 2003Co-Authors: Ross Bogey, Kay Cerny, Olfat MohammedAbstract:ABSTRACT Bogey R, Cerny K, Mohammed O: Repeatability of wire and surface Electrodes in gait. Am J Phys Med Rehabil 2003;82:338–344. Muscle forces are not directly measurable without invasive methods (i.e., tendon force transducers). Techniques such as dynamic electromyography are therefore required to obtain insight into the role of muscles during motion. There is controversy about the choice of recording Electrode Type. Surface Electrodes are noninvasive and allow recording over a large area yet may allow intramuscular crosstalk. Indwelling Electrodes also have been used in gait analysis. This Electrode Type is able to analyze the electrical activity of small or deep muscles. Despite the advantages of intramuscular Electrodes for some applications, this Electrode Type is often rejected because of the need for skin penetration and for specialized personnel to acquire the data. The reliability of the wire electromyographic signal has also been questioned. The objective of this study was to determine if there were differences in the test-retest reliability of surface vs. intramuscular Electrodes in gait analysis. Surface and intramuscular electromyographic data were obtained from the soleus muscle in 18 adults with no history of neuromuscular disease as they performed self-selected speed walking. A statistical criterion (variance ratio) was used to measure the reproduction of phasic patterns of muscle activity with both wire and surface Electrodes on repeat-day testing of the soleus muscle. Each Electrode Type was remarkably consistent. Mean variance ratio values for wire Electrodes (mean = 187) were slightly lower than mean surface electromyographic variance ratio values (mean = 199). These differences did not approach statistical significance (P = 0.768). The study results show that the dynamic electromyographic signal obtained with wire Electrodes is, at minimum, as repeatable as surface electromyograms.
Shinichi Yokota - One of the best experts on this subject based on the ideXlab platform.
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A study on a soft microgripper using MEMS-based divided Electrode Type flexible electro-rheological valves
Mechatronics, 2015Co-Authors: Kazuhiro Yoshida, Noboru Tsukamoto, Joon-wan Kim, Shinichi YokotaAbstract:Abstract This paper presents a novel soft microgripper whose finger consists of a hydraulic rubber actuator and an ER valve to manipulate tools and objects on an in-pipe working micromachine flexibly. The microgripper can also manipulate fragile objects such as biological cells safely. The electro-rheological fluid (ERF) flow into the hydraulic rubber actuator is controlled by the ER valve through its apparent viscosity increase due to the applied electric field. The ER valve in this study is a proposed divided Electrode Type flexible ER microvalve (DE-FERV) which has axially divided parallel plate Electrode pairs in a flexible tube and has high bending flexibility and high axial rigidity. The hydraulic rubber actuator has plural walls inside to restrict the radial expansion and axially extends by the inner pressure increase. The microfinger is composed of a hydraulic rubber actuator and a DE-FERV on the side and bends by the extension of the hydraulic rubber actuator. To miniaturize the soft microgripper, MEMS fabrication process was developed and applied. A 2.8 mm long DE-FERV was designed and successfully fabricated with the Electrode total length of 2.8 mm, width of 1 mm, and gap height of 0.1 mm. The pressure change ratio up to 6.3 was shown experimentally. A 3 mm long hydraulic rubber actuator was fabricated by molding process and attached to the DE-FERV. Based on air pressure tests, it was estimated that the microgripper will be able to grasp 0.4 mm wide objects with a grasping force 2.4 mN.
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Actuators Making Use of Electro-Rheological Fluids: Movable Electrode Type ER Actuators:
Journal of Intelligent Material Systems and Structures, 1999Co-Authors: Yutaka Kondoh, Shinichi YokotaAbstract:By employing ER fluids as working fluids in fluid power systems, direct interface can be realized between electric signals and fluid power without the need for mechanical moving parts like spools in control valves. In this paper, first, novel hydraulic actuators with ER fluids and with movable Electrodes (METERA: Movable Electrode-Type ER Actuator) are proposed, which are classified into a linear Type (L-METERA) and a rotary-Type (R-METERA). Secondly, a design method of L-METERA is described and a small sized L-METERA is fabricated, whose size is 40 mm x 18 mm x 16 mm. Thirdly, a design method of R-METERA is described and a small sized R-METERA is fabricated, whose size is 067 mm x 53 mm. Principles of METERA are confirmed with the fabricated METERA.
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IROS - Movable Electrode-Type ER actuators (proposal of linear-Type and rotary-Type METERA)
Proceedings 1999 IEEE RSJ International Conference on Intelligent Robots and Systems. Human and Environment Friendly Robots with High Intelligence and, 1Co-Authors: Yutaka Kondoh, Shinichi YokotaAbstract:By employing ER fluids as working fluids in fluid power systems, a direct interface can be realized between electric signals and fluid power without the need for mechanical moving parts like spools in control valves. In the paper, first, hydraulic actuators with ER fluids and with movable Electrodes (METERA: movable Electrode-Type ER actuator) are proposed, which are classified into a linear Type (L-METERA) and a rotary-Type (R-METERA). Secondly, a design method of L-METERA is described and a small sized L-METERA is fabricated, whose size is 40 mm/spl times/18 mm/spl times/16 mm. Thirdly, a design method of R-METERA is described and a small sized R-METERA is fabricated, whose size is /spl phi/67 mm/spl times/53 mm. Principles of METERA are confirmed with the fabricated METERA.
K Nakamura - One of the best experts on this subject based on the ideXlab platform.
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characterization of miniaturized one side Electrode Type fluid based inclinometer
Sensors and Actuators A-physical, 2008Co-Authors: Asrulnizam Abd Manaf, K Nakamura, Yoshinori MatsumotoAbstract:Abstract In this study, electrical double-layer theory is applied to realize a one-side-Electrode-Type fluid-based inclinometer combined with complementary metal oxide semiconductor (CMOS) circuitry. Substrate penetration lithography was applied in the fabrication of high-aspect-ratio SU-8 container molds, and molds with heights 1.0 mm were fabricated. Polydimethylsiloxane (PDMS) was used as the container material, and Electrodes were fabricated on a ceramic substrate. Considering the electrical double-layer property, low surface tension, the dielectric constant and the problem of volatilization, methanol and propylene carbonate were tested as electrolytes. A charge-balanced capacitance–voltage ( C – V ) conversion circuit was designed as a detection circuit for this sensor and it was fabricated using 0.35 μm CMOS technology. The sensor part and detection circuit were integrated in one ceramic packaging for realize a miniaturization of inclination sensor system. To overcome the surface tension of the PDMS surface, silicone oil was injected in the container to cover the entire inner surface so that the movement of solution in the container became smooth. The linearity of the analog output of ±60° inclination for container dimensions of O 4.0 mm × 1.0 mm (diameter × thickness) was less than 6%/F.S. The minimum moving angle and response time were 0.4° and 0.9 s, respectively, when propylene carbonate was used as the electrolyte. The change in temperature did not affect the output voltage of the sensor between 0 and 50 °C. The effect of vibration was demonstrated in this paper.
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one side Electrode Type fluid based inclinometer combined with cmos circuitry
IEEE Sensors, 2007Co-Authors: Bin Abd A Manaf, K Nakamura, J Onishi, Yoshinori MatsumotoAbstract:In this study, electrical double layer theory is applied to realize one-side-Electrode-Type fluid-based inclinometer combined with CMOS circuitry. Charge-balanced capacitance-voltage conversion (C-V converter) circuit was designed as detection circuit and it was fabricated using 0.35 mum CMOS process. The sensor design and substrate penetration lithography method are demonstrated in sensor fabrication, and experiment to find a proper fluid for this application was implemented.