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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.


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Journal ArticleDOI
TL;DR: In this article, the authors presented an improved design of a wireless inductive sensor with novel compressive parts and its integration with a suitable mechanical device, which can be used as a seat occupancy detector with adjustable weight threshold.
Abstract: The objective of this paper is to present an improved design of a wireless inductive sensor with novel compressive parts and its integration with a suitable mechanical device. The proposed system can be used as a seat occupancy detector with adjustable weight threshold. It consists of a sensor (inductor, steel springs, and ferrite plate), an antenna, and a mechanical device for transferring the scaled weight to the sensor. The sensor is designed in such a way that the weight applied to its surface causes the built-in springs to compression, and as a result, the reduction of the distance between the inductor and the ferrite plate, which in turn changes in the sensor’s inductance, and consequently the antenna-sensor resonant frequency, which is used as the electric output. The mechanical device, which serves as a weight converter, has also been developed. The prototype of the system is fabricated and experimentally tested in order to confirm its functionality and performance. A three-segment linear characteristic is obtained with the following sensitivities: 0.9 MHz/kg for the weights of 0–20 kg, 1.86 MHz/kg for the weights of 20–40 kg, and 0.19 MHz/kg for the weights of 40–50 kg. These results show that the developed system can detect the presence of weight and, therefore, can be used for seat occupancy detection in a vehicle safety restraint and airbag systems. It can also be used as the indicator in the airbag safety restraint systems when the occupant’s weight exceeds the defined weight threshold for the airbag activation.

14 citations

01 Jan 2015
TL;DR: The paper describes an improved direct inductive sensor to microcontroller interface by incorporating external MOSFET transistors which results in increased resolution for a given time base and can be used to interface inductive sensors with lower inductance.
Abstract: The paper describes an improved direct inductive sensor to microcontroller interface by incorporating external MOSFET transistors. In such a way, the measured discharging time interval can be increased (through the discharging time constant) which results in increased resolution for a given time base. The experimental results show that the resolution of the measurements can be significantly improved in comparison to the basic low pass filter and high pass filter topology. Moreover, such circuit can be used to interface inductive sensors with lower inductance.

14 citations

Patent
01 Jun 2015
TL;DR: In this article, a passive radio frequency identification (RFID) sensor is provided, which includes an inductive loop, a processing module, and a wireless communication module, including a tuning module that may vary a reactive component impedance coupled to the inductive loops in order to change a system impedance.
Abstract: A passive radio frequency identification (RFID) sensor is provided. This passive RFID sensor includes an inductive loop, a processing module, and a wireless communication module. The inductive loop has an inductive loop impedance that may vary with an environment in which the inductive loop is placed. The processing module couples to the inductive loop and has a tuning module that may vary a reactive component impedance coupled to the inductive loop in order to change a system impedance. The system impedance includes both the inductive loop impedance and the reactive component impedance. The tuning module then produces an impedance value representative of the reactive component impedance. A memory module may store the impedance value which may then later be communicated to an RFID reader via the wireless communication module. The RFID reader may then exchange the impedance value representative of the reactive components of impedance with the RFID reader such that the RFID reader or another external processing unit may process the impedance value in order to determine environmental conditions at the inductive loop. These environmental conditions may include but are not limited to temperature, humidity, wetness, or proximity of the RFID reader to the passive RFID sensor.

14 citations

Patent
07 Sep 2005
TL;DR: An integrated fluxgate-induction sensor is formed of a combined fluxgate sensor and induction sensor using a common core as discussed by the authors, which provides for a compact magnetic sensor system capable of sensing magnetic fields which oscillate from zero frequency to 10 kHz and higher.
Abstract: An integrated fluxgate-induction sensor is formed of a combined fluxgate sensor and induction sensor using a common core. The sensor may be in serial operation where it switches between a fluxgate mode for measuring static magnetic fields and an induction mode for measuring alternating magnetic fields. Additionally, the sensor may be used in an interleaved operation where the sensor operates from the fluxgate mode during the transition period where its core is changing from a high permeability state to a low permeability state or vice versa, while the sensor operates in the induction mode when the core is in its high permeability state. The resulting sensor provides for a compact magnetic sensor system capable of sensing magnetic fields which oscillate from zero frequency to 10 kHz and higher.

14 citations

Journal ArticleDOI
TL;DR: In this article, the effect of microstructural variations, particularly decarburisation, on the signal from an electromagnetic sensor used to detect ferrite formation from austenite below the Curie temperature was reported.

14 citations


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