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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
01 Oct 2020-Sensors
TL;DR: A method to incorporate a thin uniform-thickness layer of conductive or magnetically permeable target material into the wide range of prosthetic liner products that people with limb amputation commonly use to create a consistent calibration result over the entire surface is presented.
Abstract: Liner-to-socket distance measurement using inductive sensing may be an effective means to continuously monitor socket fit in people using trans-tibial prostheses. A practical limitation, however, is a means to incorporate a thin uniform-thickness layer of conductive or magnetically permeable target material into the wide range of prosthetic liner products that people with limb amputation commonly use. In this paper, a method is presented whereby a 0.50-mm thickness ferrous polymer made from a SEEPS polymer and iron powder that is formed adjacent to a 0.25-mm thick non-ferrous layer of SEEPS polymer is assembled between two sheets of elastic fabric material. Bench testing showed that the fabrication procedure achieved a root-mean-square error in the thickness of this construct of 58 μm, helping to create a consistent calibration result over the entire surface. The original fabric backing of an off-the-shelf prosthetic liner was removed and replaced with the developed construct. When worn in the shoe of an able-bodied participant for 7.5 h per day for 28 days, the sensor well maintained the shape of its calibration curve at the start of wear, but a distance offset (shifting of the y-intercept) was introduced that increased during the initial approximately 12 days of wear. When the distance offset was corrected, for the primary distance range of clinical interest for this application (0.00–5.00 mm), the sensor maintained its calibration within 4.4%. Before being used in clinical application for liner-to-socket distance monitoring, new ferrous liners may need to be pre-worn so as to achieve a consistent distance reference.

2 citations

Patent
21 Nov 2017
TL;DR: In this article, a Lorentz force motor direct drive inductive sensor calibration method and device is presented, which takes a dual-frequency laser interferometer as a motion reference and adopts a piezoelectric ceramic displacement stage for micro motion positioning to compensate for a macro motion positioning error.
Abstract: The invention discloses a Lorentz force motor direct drive inductive sensor calibration method and device, and belongs to the technical field of precision measurement. The calibration method and device take a dual-frequency laser interferometer as a motion reference, a voice coil motor as a macro motion drive element, an air-floating guide rail as a macro motion guide element, and capacitive sensors and the dual-frequency laser interferometer as macro motion feedback elements for macro motion coarse positioning; and adopt a piezoelectric ceramic displacement stage for micro motion positioning to compensate for a macro motion positioning error. The four capacitive sensors are used to compensate the pitch and yaw errors of a macro motion positioning platform. According to the invention, the contradiction between the travel and precision of the calibration device of the displacement sensor can be effectively solved, and the dynamic and static calibration of the large-travel and high-precision inductive displacement sensor is realized.

2 citations

Patent
26 Dec 2012
TL;DR: In this paper, an external electronic display system for motorcycle gears is presented, which is more concise and reasonable in structure and low in price, and is not only convenient to maintain but also simplified in internal structure of the engine, so that the manufacture cost of the entire motorcycle is saved.
Abstract: The utility model relates to the field of manufacture of motorcycles and discloses an external electronic display system for motorcycle gears. A signal sampling device of the system comprises an inductive sensor and a guide bracket, wherein a gear displayer is a digital electronic displayer and is arranged on the surface of an instrument console of a motorcycle, and the signal sampling device and the gear displayer are connected through a wire harness group. The inductive sensor is arranged on the outer side face of an engine body or a corresponding fixing part of a motorcycle frame; and the guide bracket is connected with an engine gear-shifting shaft. The external electronic display system disclosed by the utility model has the beneficial effects that the traditional built-in mechanical type gear-shifting signal sampling manner of the motorcycle is abandoned, the external non-contact type gear-shifting signal sampling manner is adopted, so that not only is the production, service and maintenance performances of the engine are enhanced, but also the stability in the gear-shifting display performance is better facilitated. Compared with the traditional product, the external electronic display system is more concise and reasonable in structure and low in price, and is not only convenient to maintain but also simplified in internal structure of the engine, so that the manufacture cost of the entire motorcycle is saved.

2 citations

Proceedings ArticleDOI
25 Jun 1995
TL;DR: In this article, the authors analyzed the problem of scaling down an inductive proximity sensor made of superposed multiple-turn flat coils and linearly scaled down all geometrical dimensions.
Abstract: SUMMARY We analyze the problem of scaling down an inductive proximity sensor made of superposed multiple-turn flat coils. We linearly scale down all geometrical dimensions. Then the nominal inductance is scaled down proportionally to the scale factor. The coupling factor of the superposed coils remains constant. However for both ferromagnetic and non-ferromagnetic targets, the sensitivity remains constant when the frequency is scaled by the inverse square of the reduction factor. But the parasitic effects in the sensor coil become more important for small device dimensions. Therefore these effects are expected to set the ultimate limit in the miniaturization of the integrated inductive proximity sensors.

2 citations

Patent
Seils Wolfgang1
05 Nov 1998
TL;DR: In this article, the sensor signal processing circuit consists of an operational amplifier (13,46 ) connected across the sensor terminals, a low-pass filter (20,50 ) connected to the operational amplifier and a capacitor (19, 46 ) connected with the operational amplifiers to generate an alternating output signal having an amplitude depending on the magnitude of the measured variable.
Abstract: The sensor circuit arrangement includes a sensor ( 23; 53 ) that produces an alternating voltage sensor signal that varies according to a measured variable; first and second current supplying circuits ( 21, 51 ) connected to respective sensor terminals to apply first and second output voltages (U 1, U 2 ) to the respective terminals; a counter-coupling network ( 24, 54 ) coupling the current supplying circuits to provide respective constant currents to the sensor ( 23, 53 ) and a sensor signal processing circuit portion. The sensor signal processing circuit portion includes an operational amplifier ( 13,46 ) connected across the sensor terminals, a low-pass filter ( 20,50 ) connected to the operational amplifier and a capacitor ( 19, 46 ) connected to the operational amplifier to generate an alternating output signal having an amplitude depending on the magnitude of the measured variable. The low-pass filter produces a filter output signal indicative of a temperature-dependent internal sensor resistance. The sensor is at an ungrounded floating potential so that common-mode interference is compensated.

2 citations


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