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Inductive sensor

About: Inductive sensor is a research topic. Over the lifetime, 2282 publications have been published within this topic receiving 21984 citations.


Papers
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Proceedings ArticleDOI
01 Oct 2012
TL;DR: An electric power sensor that measures near-field voltage and current waveforms through the insulation layer on a power cord is presented in this paper, where the power sensor performs auto calibration to estimate miss-alignments between the sensors and the wires in the cord.
Abstract: An electric power sensor that measures near-field voltage and current waveforms through the insulation layer on a power cord is presented. To measure the line current, we examined Hall, giant magneto-resistive (GMR) and inductive sensors and found that for sensing 60 Hz current through its magnetic field, the inductive probe resulted in the best performance. To measure the voltage waveform, we developed a near-field electric dipole antenna that consisted of two strips of copper approximately 3 mm long. The voltage and current sensors were then calibrated and uncertainties due to the placement of the sensors over power cords were determined. A method was developed to enable the power sensor to perform auto calibration to estimate miss-alignments between the sensors and the wires in the cord. Power measurement accuracy of better than 5% was achieved.

15 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed and evaluated a built-in position sensor for an electrostatic motor called a dual excitation multiphase electrostatic drive, which operates on a similar principle to typical capacitance-type linear encoders.
Abstract: This paper proposes and evaluates a built-in position sensor for an electrostatic motor called a dual excitation multiphase electrostatic drive. The built-in sensor operates on a similar principle to typical capacitance-type linear encoders. The sensor system superimposes a high-frequency sensor signal onto a low-frequency driving signal so that it can share the same electrodes with driving operation of the motor. This paper analyses the sensor principle based on a capacitance network model of the motor that allows us to evaluate the linearity error of the proposed sensor system. The sensor was implemented on a prototype motor to evaluate its performance. The experimental results confirmed that the sensor can work successfully by sharing the same electrodes with the driving operation. The linearity error was found to be 24 ?m when no driving signal was applied. As the driving signal was applied, the linearity error was found to increase up to 48 ?m.

15 citations

Proceedings ArticleDOI
03 Apr 2012
TL;DR: This study presents a high efficiency inductive power link aiming for the implanted biomedical devices which utilizes the resonance phenomenon which enables maximum energy transfer between objects which are at resonance.
Abstract: This study presents a high efficiency inductive power link aiming for the implanted biomedical devices. Improving the efficiency of the inductive link is critical, since the overall efficiency of a remote powering system is dominated by the inductive link. Therefore, the proposed system utilizes the resonance phenomenon which enables maximum energy transfer between objects which are at resonance. In this study, the resonance is created between 4 spiral coils which are implemented on the internal and external units; each formed by two concentric coils. The system operates with 72% power efficiency at 10–12 MHz band at 10 mm distance which is a reasonable distance for powering implanted devices. Moreover, the characterization of the resonant inductive link with respect to distance and frequency is performed.

15 citations

Patent
13 Mar 1984
TL;DR: In this paper, a filter network is inserted between the output of the loop oscillator and the sensing circuitry to improve performance when cross-talk occurs due to mutual interference between a number of inductive loop detectors forming part of a total installation.
Abstract: An inductive loop presence detector, more especially a vehicle detector, including a loop oscillator having an inductive loop connected as a frequency determining element of the oscillator, which inductive loop may be buried in a roadway to sense the presence of vehicles, and sensing circuitry to detect changes in the loop oscillator frequency due to vehicle movements in the vicinity of the loop, with a filter network inserted between the output of the loop oscillator and the sensing circuitry to improve performance when cross-talk occurs due to mutual interference between a number of inductive loop detectors forming part of a total installation The filter network can be a phase-locked loop incorporating a low pass filter to attenuate high frequency components due to cross-talk

15 citations

Patent
08 Dec 1999
TL;DR: In this paper, a sensor is a conventional inductance (5) in an oscillatory circuit with a second coil (8), a test coil with its own oscillator circuit, which can be activated for the purpose of testing the sensor, over a predetermined interval.
Abstract: The sensor is a conventional inductance (5), in an oscillatory circuit. It has a second coil (8), a test coil with its own oscillatory circuit, which can be activated for the purpose of testing the sensor, over a predetermined interval.

15 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202321
202242
202140
202082
201997
201871