Capacitive transducers with curved electrodes

McIntosh, Robert; Mauger, Phillip E.; Patterson, Steven R.

doi:10.1109/jsen.2005.854137

Cited by 21 publications

(6 citation statements)

References 21 publications

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“…There are several suitable materials, which include silver/silver chloride (Ag/AgCl) [15], titanium nitride (TiN), platinum (Pt) [16] and iridium oxide (IrO2) [17]. Nonetheless, IrO2 has been proven to be one of the most promising and preferred materials for electrodes [18], [19] due to its high charge delivery capacity, low constant impedance over the entire frequency range for neural stimulation and biocompatibility [20].…”

Section: Electrode Designmentioning

confidence: 99%

Neural Electrode Array Based on Aluminum: Fabrication and Characterization

et al. 2013

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A unique neural electrode design is proposed with 3 mm long shafts made from an aluminum-based substrate. The electrode is composed by 100 individualized shafts in a 10 × 10 matrix, in which each aluminum shafts are precisely machined via dicing-saw cutting programs. The result is a bulk structure of aluminum with 65 ° angle sharp tips. Each electrode tip is covered by an iridium oxide thin film layer (ionic transducer) via pulsed sputtering, that provides a stable and a reversible behavior for recording/stimulation purposes, a 40 mC/cm2 charge capacity and a 145 Ω impedance in a wide frequency range of interest (10 Hz-100 kHz). Because of the non-biocompatibility issue that characterizes aluminum, an anodization process is performed that forms an aluminum oxide layer around the aluminum substrate. The result is a passivation layer fully biocompatible that furthermore, enhances the mechanical properties by increasing the robustness of the electrode. For a successful electrode insertion, a 1.1 N load is required. The resultant electrode is a feasible alternative to silicon-based electrode solutions, avoiding the complexity of its fabrication methods and limitations, and increasing the electrode performance.The work of A.C. Peixoto was supported in part by the Portuguese Foundation for Science and Technology under Grant SFRH/BD/89509/2012, and the FCT with the reference Project FCOMP 01 0124-EDER-010909 under Grant FCT/PTDC/SAU-BEB/100392/2008. The associate editor coordinating the review of this paper and approving it for publication was Prof. Carlo Morabito

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Section: Electrode Designmentioning

confidence: 99%

Neural Electrode Array Based on Aluminum: Fabrication and Characterization

et al. 2013

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“…In one circuit, a capacitor is placed in a bridge circuit with a reference capacitor and the bridge is actively nulled by current feedback to provide a linear output over a wide dynamic range [15], [16].…”

Section: B Electronicsmentioning

confidence: 99%

Fringing Field Capacitance Sensor for Measuring the Moisture Content of Agricultural Commodities

McIntosh

Casada

2008

IEEE Sensors J.

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A fringing field capacitive sensor is described for measuring the moisture content (MC) and temperature of agricultural commodities. Sensor performance was characterized by mounting the device on handheld probes and in acrylic canisters to determine the dielectric constant and MC of wheat and corn. The handheld probes demonstrated a promising capability to measure the MC of grain in hoppers, truck beds, and cargo holds. It is proposed that the sensors be supported on cables in grain silos and storage bins to acquire in situ data for grain storage management and control of aeration systems. The sensor is watertight and constructed with corrosion resistant materials which allow MC measurements to be made of industrial materials, chemicals, and fuels.

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“…Different reports on the design, characterization, operation and possible applications of such devices have been given by the author 1,2) and others [3][4][5][6][7] . A CMOS-compatible capacitive high temperature pressure sensor was reported 8) .…”

Section: Introductionmentioning

confidence: 99%

Conductivity Effect on the Capacitance Measurement of a Parallel-Plate Capacitive Sensor System

Anaraki

2016

ijp

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In this article design and operation of a parallel-plate capacitive sensor based on the dielectric capacitance and conductance change of the gap medium is reported. The designed system was used to determine characteristics of different water liquids as a result of the capacitance variations. The air gap capacitance is measured and then by filling the gap with a liquid the capacitance is monitored for different liquids. Proposed sensor is used for the distilled, tap, boiled, and salt water measurements and the capacitance results are compared. A big difference about 45.5µF in capacitance values for the salt and distilled water shows a high sensitivity, which can be used to recognize different water liquids. The experimental results are promising for water liquids and verify the successful operation of such a device as a liquid sensor, a useful method for checking the electrical quality of the water that is required for different applications.

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Capacitive transducers with curved electrodes

Cited by 21 publications

References 21 publications

Neural Electrode Array Based on Aluminum: Fabrication and Characterization

Neural Electrode Array Based on Aluminum: Fabrication and Characterization

Fringing Field Capacitance Sensor for Measuring the Moisture Content of Agricultural Commodities

Conductivity Effect on the Capacitance Measurement of a Parallel-Plate Capacitive Sensor System

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