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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
TL;DR: In this paper, a planar transformer is used for a two-coil proximity sensor, where the primary and secondary coils are fabricated on a micromachined membrane to protect the primary coil from the environment.
Abstract: Here we present results for a new inductive proximity sensor that makes use of two coupled coils, forming a planar transformer, fabricated on a micromachined membrane. Macroscopic proximity sensors based on eddy-current techniques are currently commercially available. However, their design is not conducive to scaling inductor. When such an inductor is scaled down and made planar, the inductance decreases while the resistance of the coil increases dramatically. This dictates that the sensor be operated at much higher frequencies for which the inductance of the coil dominates its resistance. In our new two-coil design a signal is applied across the primary coil and a significant sensitivity to the gap to the 'target' plate is seen in the phase difference between the primary and secondary output. This phase change is largely invariant with change in coil resistance (due to either temperature change or change due to scaling to IC levels), allowing operation at lower frequencies than that required for a single coil proximity sensor. By fabricating the transformer on the back side of a micromachined membrane, the coil is protected from the environment, while the deleterious effect of the silicon substrate on inductance is eliminated.

4 citations

Patent
09 Jun 2009
TL;DR: An inductive liquid-level sensor employs a central shaft supporting multiple independent electrical loops that may be interrogated to detect the proximity of the conductive element in the float rising and falling with changes in liquid height outside of the shaft as mentioned in this paper.
Abstract: An inductive liquid-level sensor employs a central shaft supporting multiple independent electrical loops that may be interrogated to detect the proximity of the conductive element in the float rising and falling with changes in liquid height outside of the shaft.

4 citations

Patent
06 Aug 2014
TL;DR: In this article, a two-dimensional magnetic field sensor device is considered, in which the first sensor element can be sensitive to a first magnetic field component (e.g., the Bx component), and the second sensor element is sensitive to the second magnetic field components, e.g. the Bz component.
Abstract: Embodiments relate to magnetic field sensor devices, systems and methods that can more accurately detect edges of a target. In one embodiment, a sensor device comprises a first magnetic field sensor element and a second magnetic field sensor element proximate a target, such as a toothwheel, to sense rotation of the target. The sensor device can be considered a two-dimensional magnetic field sensor in embodiments, in that the first magnetic field sensor element can be sensitive to a first magnetic field component (e.g., the Bx component), and the second magnetic field sensor element can be sensitive to a second magnetic field component (e.g., the Bz component). In other embodiments, sensor system 600 can be a three-dimensional magnetic field sensor. The sensor device can be arranged with respect to the target such that the signal from one or the other of the first and second magnetic field sensor elements can be used to determine a switching threshold depending on whether a detected edge is rising (i.e., transitioning from a gap to a tooth of the toothwheel) or falling (transitioning from a tooth to a gap of the toothwheel).

4 citations

Journal Article
TL;DR: In this paper, a three-coil inductive particle monitoring sensor was designed according to the coupling relation between particle in lubricating oil and the induction coil, and the results show that the detection resolution of ferromagnetic abrasive reaches 100 μm.
Abstract: The particles in lubricating oil reflect a lot of information of Mechanical operation Status,so the particle detection has a very important engineering application.Design a three-coil inductive particle monitoring sensor,according to the coupling relation between particle in lubricating oil and the induction coil.Basing on the sensor measurement principle,the detection circuits include drive circuit of amplitude and phase adjustment,pre-amplifier,precision rectifier circuit and the second stage filter amplifier circuit.The results show that:the detection circuits combine with the follow-up signal acquisition module and the LabVIEW NI data processing,the detection resolution of ferromagnetic abrasive reaches 100 μm.

4 citations

Patent
19 Sep 2012
TL;DR: In this article, an inductive proximity sensor and a method for calibrating the same is presented, the sensor including an oscillator having first and second inductor-capacitor circuits arranged such that an inductance of one of the inductors has substantially greater sensitivity to an external target than an inductances of the other inductors.
Abstract: The present invention relates to an inductive proximity sensor and a method for calibrating the same, the sensor including an oscillator having first and second inductor-capacitor circuits arranged such that an inductance of one of the inductor-capacitor circuits has substantially greater sensitivity to an external target than an inductance of the other inductor-capacitor circuit The sensor also includes an alternating current drive to each of the inductor- capacitor circuits that is in-phase and depends on differences in voltage across the inductor-capacitor circuits The sensor may be coupled to a calibration device that applies power and triggers a calibration routine within the sensor In response to the trigger signal, a calibration processor within the sensor executes the calibration routine and adjusts the inductor-capacitor circuits and provides an indication of successful calibration

4 citations


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