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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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Patent
17 May 1993
TL;DR: In this paper, a variable reluctance transducer system incorporating digital control of parallel resonant circuits (L1C1, L2C1) including two inductive sensors (L 1, L 2) on each side of a flat diaphragm.
Abstract: A variable reluctance transducer system incorporating digital control of parallel resonant circuits (L1C1, L2C1) including two inductive sensors (L1, L2) on each side of a flat diaphragm. The two parallel resonant circuits provide dual frequency signals for digital calculation to obtain a quotient of the frequencies, thereby substantially eliminating the resonant frequencies as a variable in the accuracy of the device. Manipulation of the produced quotient by a microcontroller (10) employing digital calibration tables stored in a programmable read only memory (14) allows calibration responsive to a temperature sensor (16), thereby substantially eliminating temperature induced error in the system.

2 citations

Proceedings ArticleDOI
01 Oct 2016
TL;DR: This paper describes pipelines tracking robot on ground which detects magnetic filed from underground pipelines which has the advantage that can ensure a more objective data as compared with the measuring method by a person.
Abstract: This paper describes pipelines tracking robot on ground which detects magnetic filed from underground pipelines. This system has the advantage that can ensure a more objective data as compared with the measuring method by a person. The pipeline tracking robot has differential drive type base and one passive wheel which has suspension function. The robot has two magnetic strength detect sensors and an electrically controlled spray at the front of the robot. Proposed method can be a way to have the advantage of helping human exploration work to create a more detailed map information.

2 citations

Patent
13 Jun 2012
TL;DR: In this paper, a key protection circuit comprising a control chip and an inductive sensor is presented, where the input terminal of the control chip is connected with a key identification circuit in a touch key system.
Abstract: The invention discloses a key protection circuit comprising a control chip and an inductive sensor. The inductive sensor is connected with an input terminal of the control chip; and an output terminal of the control chip is connected with a key identification circuit in a touch key system. Besides, the key protection circuit also comprises a first differential line and a second differential line, wherein the two differential lines are arranged between the inductive sensor and the input terminal of the control chip; the first differential line and the earth form a first induction capacitor; and one end of the second differential line and the earth form a second induction capacitor, wherein the one end of the second differential line approaches the inductive sensor. And according to a difference value between the first induction capacitor and the second induction capacitor, it is determined whether the output terminal of the control chip is used to output a signal to the key identification circuit in the touch key system. In addition, a realization method of the key protection circuit is provided in the invention. According to the provided key protection circuit in the invention, it can be realized that no dysfunction phenomenon occurs at a touch key when the touch key is interfered by an external electromagnetic wave or the ground level is fluctuated, thereby substantially improving convenience of user operation; and meanwhile, the system can be stable.

2 citations

Patent
31 Oct 1986
TL;DR: In this article, a proximity sensor of the inductive sensor type with an oscillatory LC circuit is designed to monitor the position of a target in a given proximity zone, and a comparator is used to compare the amplitude of the oscillations with the said reference voltage so as to deliver output pulses depending on the target position.
Abstract: The monitoring device for a proximity sensor of the inductive sensor type with an oscillatory LC circuit is designed to monitor the position of a target in a given proximity zone. An oscillatory RC circuit 8, 16-19, is coupled to the oscillatory LC circuit 3-4 through an inductance 7 in order to start up its oscillations; a resistance bridge 12, 13, using the sensor supply voltage, defines a biasing voltage for the oscillatory circuits and an adjustable reference voltage; and a comparator 9 compares the amplitude of the oscillations with the said reference voltage so as to deliver output pulses depending on the target position.

2 citations

Patent
09 Sep 1981
TL;DR: In this paper, a saddle coil fitting closely on the outer pipe wall is used to measure pressure changes in the line with the aid of an electrical measuring circuit connected to the saddle coil.
Abstract: Electromagnetic sensor for measuring the pressure in pipelines (21) by means of the pressure-dependent expansion of a magnetic conductive material, in which expansion voltage-dependent permeability changes of the pipeline wall form a measure of pressure changes in the line (21) with the aid of at least one saddle coil (23) fitting closely on the outer pipe wall as inductance changes of the coil (23) measurable in an electrical measuring circuit connected to the coil.

2 citations


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