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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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Patent
28 Feb 1997
TL;DR: In this paper, the authors distinguish between frequency-modulated inductive sensor signals generated at a remote place and transmitted over signal conductors to an evaluation arrangement, where sensor signals are caused by eventual wheel influences, and are supplied to an input filter, by which they are prepared for the evaluation.
Abstract: The arrangement distinguishes between frequency-modulated inductive sensor signals generated at a remote place and transmitted over signal conductors to an evaluation arrangement. The sensor signals are caused by eventual wheel influences, and are supplied to an input filter, by which they are prepared for the evaluation. A frequency-to-voltage converter (FSU1, FSU2) with at least one coupled trigger (T12, T22) is connected to the signal conductors (SK). The threshold of the trigger lies below or above a signal level which settles in when the sensor is not influenced and when no noise is present. The trigger responds to an under- or overstepping of the threshold value. The output signal of the trigger is combined by an AND function with the output signal of a further trigger (T13, T23) which is connected at least indirectly to the output of the input filter, and which responds when the value falls below its predetermined threshold.

9 citations

Journal ArticleDOI
TL;DR: In this article, a computer-aided study of magnetic circuit/coil/target systems for proximity inductive sensors is presented, where a specific method for using the software and the results obtained by applying this method to four typical geometries of magnetic circuits are presented.
Abstract: The authors are concerned with the computer-aided study of magnetic circuit/coil/target systems for proximity inductive sensors: for this study software for computation of magnetic parameters is used. A specific method for using the software and the results obtained by applying this method to four typical geometries of magnetic circuits are presented. The parameters studied are: the geometry of the magnetic circuit, the geometry and position of the coils, the permeability mu of the magnetic circuits and targets and the saturation of the magnetic circuits.

9 citations

Journal ArticleDOI
TL;DR: In this article, a low-profile vacuum actuator (LPVAc) with an integrated inductive displacement sensor is proposed to assist the sit-to-stand transition in a wearable exosuit.
Abstract: Muscle weakness owing to stroke, spinal cord injuries, or aging can make a person’s life sedentary, temporarily as well as permanently. Such persons need to be motivated to break their sedentary postures and attempt independent motion. A key motivator in this aspect is the ability to easily transition from seated to standing posture. If this sit-to-stand transition (STSt) is easy, it will encourage further mobility. A soft wearable device that can assist the STSt, would fill this need perfectly. Such a device should be able to seamlessly assist during STSt and be unobtrusive during sitting. A major limitation that is currently holding back the development of soft exosuits in STSt-assist is the lack of low-profile soft actuators with high strain rate and force-to-weight ratio. Hence, we propose a novel low-profile vacuum actuator (LPVAc) with an integrated inductive displacement sensor that, can be rapidly fabricated, is lightweight (14g), and can provide high strain (65%) and a high force-to-weight ratio (285 times self-weight). The proposed actuator comprises a low-profile spring encased within a low-density polyethylene film with rapid vacuum actuation and passive quick return. The proposed inductive sensor has a sensitivity of $0.0022~\mu H/mm$ and the hysteresis is below 1.5% with an overall absolute average error percentage of 5.24%. The performance of the proposed integrated sensor in displacement control of the LPVAc is experimentally evaluated. The proposed actuator is integrated into a novel mono-articular STSt-assist exosuit for preliminary testing. Surface electromyography measurements of the gluteus maximus muscles during STSt indicate a mean muscle activity reduction of 45%. This supports the potential use of the proposed actuator in STSt-assist.

9 citations

Journal ArticleDOI
TL;DR: In this paper, a PD detection algorithm is implemented to obtain the accurate locations of PD sources by considering not only the time difference of pulses, but also pulse polarity, and the algorithm was then applied to an on-site, 345 kV XLPE cable.
Abstract: Even though a lot of research has been devoted to find partial discharge (PD) sources based on the time difference of pulses, it has been reported that studies have been unable to obtain precise locations in joints due to the errors caused by the attenuation or distortion of PD pulses. In this study, in order to reduce the issues, ‘Precise PD finding’ is developed to obtain the accurate locations of PD sources by considering not only the time difference of pulses, but also pulse polarity. Accordingly, a PD detection algorithm is implemented. An attachable inductive sensor is designed and fabricated and then applied to a real scaled 154 kV XLPE cable with a joint. From the experimental results, the algorithm was verified to successfully find the locations of PD sources. The algorithm was then applied to an on-site, 345 kV XLPE cable. Consequently, PD sources were detected in a normal straight joint box and confirmed through a disassembly investigation.

9 citations

Patent
30 Sep 2013
TL;DR: In this article, the capacitive sensor configuration for proximity detection by a playback device is described. But the authors do not consider the physical approach of an entity towards the playback device from one or more of the first and second directions.
Abstract: Embodiments of a capacitive sensor configuration for proximity detection by a playback device are provided. The playback device may include a capacitive proximity sensor configured to detect physical movement in a first direction, and a radio frequency (RF) antenna ground plane oriented at a relative angle to the capacitive proximity sensor. The capacitive proximity sensor may include a first metal electrode coupled to the RF antenna ground plane is coupled to the first metal electrode such that the capacitive proximity sensor may be further configured to detect physical movement in a second direction that is substantially the relative angle to the first direction. The playback device may be configured to determine based on a detection of physical movement by the capacitive proximity sensor, a physical approach of an entity towards the playback device from one or more of the first direction and the second direction.

9 citations


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