scispace - formally typeset
Search or ask a question
Topic

Inductive sensor

About: Inductive sensor is a research topic. Over the lifetime, 2282 publications have been published within this topic receiving 21984 citations.


Papers
More filters
Patent
25 Jan 2006
TL;DR: In this article, a first measured value is determined which is associated with the proximity of a target to an inductive sensor, and a differential measuring technique is used to determine the first measurement value in accordance with relative amplitudes of said first voltage signal and said second voltage signal.
Abstract: A first measured value is determined which is associated with the proximity of a target to an inductive sensor. A first voltage signal having a first amplitude is generated. The first voltage signal is provided as a driving signal to the inductive sensor. A sensor current signal is received as a return signal output from the inductive sensor. The sensor current signal has an amplitude proportional to a proximity of the target to the inductive sensor. The sensor current signal is converted to a corresponding second voltage signal having a second amplitude. A differential measuring technique is used to determine the first measured value in accordance with relative amplitudes of said first voltage signal and said second voltage signal.

7 citations

Proceedings ArticleDOI
21 Jul 2004
TL;DR: In this article, the authors proposed the BEMI (Barkhausen Noise and Eddy Current MIcroscopy) method for non-destructive testing of thin materials.
Abstract: The need for an accelerated development of new materials and surfaces raises expectations in lateral homogeneity and quantitative exactness of the characteristic material properties. The interest is focused on microstructure characterization, detection of micro-imperfections and evaluation of the local distribution of residual stresses, mechanical hardness and coating thickness. These requirements meet with the development of high-resolution NDT methods such as Barkhausen Noise and Eddy Current MIcroscopy (BEMI) at IZFP. BEMI enables locally high-resolved non-destructive materials testing by means of Barkhausen noise and eddy current analysis: The sample is scanned with a miniaturized inductive probe which serves as Barkhausen noise pick-up and eddy current inductive sensor. Characteristic quantities are derived from the measured data and mapped as 2-D or 3-D images allowing the recognition of defects as small as 5 μm. The device is controlled by a modular measuring system which is split into modules for positioning, data acquisition and evaluation. Two additional software modules enable contact-less, quantitative testing of sensitive surfaces. This way, thin coatings can be characterized regarding their microstructure, thickness, internal stresses and heat-treatment condition. The efficiency of this device was demonstrated on many materials as solids stacks of several thin films. The BEMI testing device achieves an accuracy of 10 nm for the thickness of thin films on a variety of substrates.

7 citations

Patent
21 Jan 2015
TL;DR: In this article, the authors described a mobile phone system, a mobile case, and a processor, which consists of a radio frequency switch, a magnetic inductive sensor, electrical connecting contacts, a transceiver circuit, and the processor.
Abstract: The embodiment of the invention discloses a mobile phone system, a mobile phone case and a mobile phone. The mobile phone system comprises the mobile phone and the mobile phone case. The mobile phone case comprises a mobile phone case body, a magnetic device and a mobile phone case antenna. The mobile phone comprises a mobile phone antenna, a radio frequency switch, a magnetic inductive sensor, electrical connecting contacts, a transceiver circuit and a processor. A control port of the radio frequency switch is connected with the processor. Three sets of pins of the radio frequency switch are connected with the transceiver circuit, the mobile phone antenna and the electrical connecting contacts respectively. The magnetic inductive sensor is connected with the processor. When the mobile phone is sleeved with the mobile phone case body, the mobile phone case antenna is communicated with the electrical connecting contacts, and the magnetic device is placed within the inductive range. When the magnetic inductive sensor inducts the magnetic device, the magnetic inductive sensor can send out a preset level signal to the processor. If the processor receives the preset level signal, the transceiver circuit is connected with the electrical connecting contacts, or else, the transceiver circuit is connected with the mobile phone antenna, and accordingly the mobile phone antenna performance can be improved.

7 citations

Journal ArticleDOI
TL;DR: A non-invasive, very inexpensive method of estimating tissue displacements of various origin that is easy and fast to set up using an inductive proximity sensor, which is a non-contact length transducer measuring the distance between its probe and a metal target.
Abstract: This paper describes a non-invasive, very inexpensive method of estimating tissue displacements of various origin that is easy and fast to set up. This technique utilizes an inductive proximity sensor (IPS), which is a non-contact length transducer measuring the distance between its probe and a metal target. Its working principle is based on the electromagnetic coupling originating between the sensor probe, a source of high-frequency magnetic field, and the metal target where parasitic currents take place. The linear working range of the IPS model used here is 0.1 to 6 mm probe-target distance, its resolution is about 2 microns. The IPS has been employed on rabbits and humans to measure the displacement of a target glued to the skin of various body areas with respect to the fixed probe of the sensor. Its high resolution, together with an extensive working range, allows the evaluation of numerous physiological events which produce displacements ranging from 2 microns -- to 9 mm, reflecting either tissue volume changes or movements. In particular, an interesting application is to monitor, through volume variations, the extent and the time course of local vascular modifications induced by manoeuvres which elicit changes in vasomotor tone; vascular filling, tissue swelling etc. Therefore, this measure may be considered a 'surface plethysmography' record. In addition, the contractions of skeletal muscles, under either isotonic or isometric conditions, can be estimated through this sensor. This system may therefore find applications for research purposes and practical demonstrations to students.

7 citations

Journal ArticleDOI
TL;DR: A novel hybrid serial/parallel multi-frequency measurement method for measuring the impedance/inductance of eddy current sensors and a good agreement between the measurements from a commercial impedance analyzer and the designed system has been found.
Abstract: This paper proposes a novel hybrid serial/parallel multi-frequency measurement method for measuring the impedance/inductance of eddy current sensors. Parallel multi-frequency measurement normally has a higher measurement speed, but a lower signal-to-noise ratio (SNR). In contrast, serial multi-frequency (sweeping frequency) has a lower measurement speed, but a higher SNR. The method proposed in this paper can flexibly combine these two features to deliver the desired speed and SNR according to the requirements of a specific application. A system is designed using the proposed method based on a field-programmable gate array. The composite parallel excitation signal is generated by a direct digital synthesis module, and the received multi-frequency data are simultaneously demodulated by a digital I/Q demodulator. The system is applied to measure the impedance of an inductive sensor, and a good agreement between the measurements from a commercial impedance analyzer and the designed system has been found.

7 citations


Network Information
Related Topics (5)
Voltage
296.3K papers, 1.7M citations
77% related
Control theory
299.6K papers, 3.1M citations
73% related
Control system
129K papers, 1.5M citations
72% related
Amplifier
163.9K papers, 1.3M citations
71% related
Capacitor
166.6K papers, 1.4M citations
71% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202321
202242
202140
202082
201997
201871