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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
17 Oct 2011
TL;DR: In this article, the authors presented several examples of inductive wear debris sensor, which can detect, count or classify wear debris, but the detectable particle size is mainly limited by the background noise.
Abstract: This review paper has presented several examples of inductive wear debris sensor. Many of these have important applications in industry. Thus, when monitoring the oil system which operates under extremely severe conditions and various features (size and type) need to detect, it is worth considering the use of inductive wear debris sensor. Based on the electromagnetic field analysis for the coil and particles, three structures of such sensors, classified by the number of coils, are available, and they all can detect, count or classify wear debris. However, the detectable particle size is mainly limited by the background noise. Accordingly, to enhance the sensor performance, the signal processing methods are necessary.

19 citations

Proceedings ArticleDOI
01 Nov 2008
TL;DR: In this article, the authors developed an ultra low power integrated circuit control module that will be incorporated into a micro machined pill-sized medical implant that continuously monitors blood-sugar levels for patients with Diabetes mellitus.
Abstract: We have developed an ultra low power integrated circuit control module that will be incorporated into a micro machined pill-sized medical implant that continuously monitors blood-sugar levels for patients with Diabetes mellitus. The circuit converts a piezoresistive sensor signal to an inter-pulse interval suited for digital transmission through a wire-less inductive link. Instead of a full analog-to-digital conversion, this analog-to-analog conversion is much simpler and more power conservative. The circuit is entirely asynchronous, requiring no energy consuming clock and operates on sub-threshold currents. A first prototype, produced with the STM 90 nm CMOS process, consumes 1.7muW. A compact on-chip resistive element is employed in a feedback loop to cancel 1/f-noise and offsets in both the sensor and the initial amplification stage. The resistive element is implemented using the quantum effect of gate-leakage, achieving an equivalent resistance of several GOmega with minimal consumption of layout space. The effectiveness of this noise reduction has been asserted in a 62 hour recording with fixed input. The measured noise spectrum appears completely white down to the minimal frequency of the recording, i.e. 4.5muHz. The standard deviation of single pulse intervals (dynamic range from 4.3ms to 15.4 ms) restricts the reconstruction of the sensor value to an accuracy equivalent to 4.41 bits. Averaging over the samples during 1 second increases this accuracy to 7.84 bits. Longer averaging will further improve that figure at the cost of longer periods of active power consumption of the implant, which will be woken up only once every 5 minutes.

19 citations

Journal ArticleDOI
TL;DR: A flexible dual-mode proximity sensor has been designed and implemented, which is capable of combining capacitive-resistive detection in this paper, and shows that R-C dual modes sense effectively which can enlarge the sensing distance compared with the single mode proximity sensor.
Abstract: A flexible dual-mode proximity sensor has been designed and implemented, which is capable of combining capacitive-resistive detection in this paper. The capacitive type proximity sensor detecting is defined as mode-C, and the resistive type proximity sensor detecting is defined as mode-R. The characteristics of the proximity sensor are as follows: (1) the theoretical mode is developed which indicates that this proximity sensor can reflect proximity information accurately; (2) both sensing modes are vertically integrated into a sandwich-like chip with an 8 mm × 12 mm unit area. The thickness of a mode-R sensing material (graphene nanoplatelets) and mode-C dielectric (the mixture of carbon black and silicone rubber) is 1 mm and 2.5 mm, respectively; (3) for mode-R, the linearity of temperature-resistance curve can achieve 0.998 in the temperature range from 25 °C to 65 °C. And for mode-C, various materials can be successfully detected with fast response and high reversibility. Meanwhile, the study compensated the influence of object temperature to ensure mode-C properly works. A cooperative sensing test shows that R-C dual modes sense effectively which can enlarge the sensing distance compared with the single mode proximity sensor. The fabrication of this sensor is convenient, and the integrity of a flexible sandwich-like structure based on dual modes is beneficial to form arrays, which is suitable to be used in skin-like sensing applications.

19 citations

Journal ArticleDOI
TL;DR: In this article, an alternative four-layer screen-returned PCB coil has been presented, which uses very few turns to preserve its high bandwidth at the expense of even tougher determination of its self-inductance.
Abstract: Accurate measurement of current through a silicon carbide (SiC) device is especially challenging, because of its fast switching speed. Its accompanied current sensor must hence have a high-bandwidth and a high-noise immunity. It must also not interfere with operation of the device. Due to these, the printed-circuit-board (PCB) Rogowski current sensor is particularly suitable, but normally requires many layers. With only four layers, the existing Rogowski coils are not yet capable of shielding ambient voltage and magnetic noises simultaneously. Moreover, their computed and measured self-inductances are usually very different with errors as high as 45% reported in the literature. To resolve these issues, an alternative four-layer screen-returned PCB coil has been presented. The described coil uses very few turns to preserve its high bandwidth at the expense of even tougher determination of its self-inductance. An alternative piecewise modelling method has therefore been proposed for finding its self-inductance, needed for designing its theoretical bandwidth. These, together with a non-inverting integrator, permit current through an SiC device to be measured accurately, as demonstrated experimentally.

19 citations

Patent
09 Apr 1992
TL;DR: The operational fitness of a vehicle-mounted magnetic sensor for detecting buried magnets which identify zones of operation of the vehicle can be tested from time to time by an electromagnet installed in proximity to the sensor as mentioned in this paper.
Abstract: The operational fitness of a vehicle-mounted magnetic sensor (90) for detecting buried magnets which identify zones of operation of the vehicle can be tested from time to time by an electromagnet (92) installed in proximity to the sensor. The electromagnet is a small coil of wire mounted near the sensor, such as a Hall effect device, which when energized, generates a test magnetic field. The analog output (102) of the sensor is compared with preestablished values when the electromagnet is energized to verify the proper operation of the sensor; it is also compared with preestablished values when sensing buried magnets to confirm operation of the sensor, the strength of the buried magnet, and the alignment of the sensor with respect to the magnet. A threshold detector (97) senses the output of the sensor to indicate when a magnetic field is detected, and the peak analog output of the sensor is stored and compared to a reference after the sensor passes the magnet. The sensors are normally tested whenever the vehicle is initially powered up or after the vehicle has been stopped for a predetermined time.

19 citations


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