Contribution to the development of a smart sensor using eddy currents for measurement of displacement

Vasseur, P; Billat, A.

doi:10.1088/0957-0233/5/8/003

Cited by 19 publications

(3 citation statements)

References 7 publications

(2 reference statements)

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“…It consists of a flat coil carved onto a printed circuit with an epoxy-resin support. This method has been used for several applications [4][5][6] and after that improved [7]. The same methods are used here, but, for an induction-balance sensor such as the one we are studying, two double-sided flat coils are necessary.…”

Section: The Sensor Specificationmentioning

confidence: 99%

A smart flat-coil eddy-current sensor for metal-tag recognition

Belloir

Huez

Billat

2000

Meas. Sci. Technol.

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This paper describes a smart eddy-current sensor for locating and identifying metal tags used to recognize buried pipes. We first describe the tags used and the technology of our locator, which is based on the induction-balance principle. We also describe an essential measurement-distance system controlling the sampling of data. An originality of the detector is the use of two flat coils carved onto an epoxy-resin support to generate the best possible electromagnetic field. The tags are made up of metal pieces of varying sizes separated by spaces of varying sizes. Intelligent pattern-recognition methods and their combination by the theory of evidence, which provide good and reliable recognition, are briefly presented. Finally, the system's performance for various depths of burial is analysed and ways to improve these results are presented.

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Section: The Sensor Specificationmentioning

confidence: 99%

A smart flat-coil eddy-current sensor for metal-tag recognition

Belloir

Huez

Billat

2000

Meas. Sci. Technol.

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“…Similarly, the position sensors, based on different operation mechanisms viz. magneto-resistive (Williumson 1968), Hall effect (Kano et al 1990), magneto-inductive (Vertesy et al 1990), capacitive (Moore et al 1993), eddy current (Vasseur and Villat 1994), have been reported. Current sensing, on the other hand plays an important role especially in automotive applications (Pross et al 1999) for power management applications.…”

Section: Introductionmentioning

confidence: 99%

A novel method for sensing rotational speed, linear displacement and current using superconducting BPSCCO magnetic sensor

2002

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For many decades, magnetic sensors have been of great assistance to mankind in variety of functions that include simple compass based navigational systems to devices that monitor the invisible biological activities. In industries magnetic sensors are in great demand for control and measurement of linear and rotary position sensing etc, because of its non destructive and contact less way of detection. Consequently, newer, smarter and cheaper materials are continuously being explored to suit the varied needs of technological requirements. In the present communication, the characteristics of a magnetic sensor, based on the non linear electromagnetic response of the weak links present in the polycrystalline BPSCCO superconductor are reported. The second harmonic response of sintered superconducting BPSCCO pellet in an alternating magnetic field at 40 kHz and 77 K being a strong linear function of low d.c. magnetic field has been utilized for the development of highly sensitive magnetic field sensors. The noise limited resolution of the sensor is found to be 3⋅ ⋅16 × 10-9 T/√ √Hz for H a.c. = 16 Oe and frequency 40 kHz. We further demonstrate that such HTSC based magnetic sensors are capable of sensing the rotational speed, small displacement and direct current with good resolution. The experimental methods and results obtained are discussed.

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“…where R c , L c , and R t , L t , are related to the geometric dimensions of the coil and target, respectively; f is the frequency of the excitation signal; and M is the mutual inductance between the coil and the target (if the distance x between the target and the coil increases, then M drops [10]). The effect of the resistor R in the measurement can be reduced by choosing proper sizes for the target and the coil [2].…”

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confidence: 99%

A Novel Interface for Eddy Current Displacement Sensors

Nabavi

Nihtianov

2009

IEEE Trans. Instrum. Meas.

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Abstract-In this paper, we propose a novel interface concept for eddy current displacement sensors. A measurement method and a new front-end circuit are also proposed. The front-end circuit demonstrates excellent thermal stability, high resolution, and low-power consumption. The proposed idea is analytically investigated. The demodulation principle, as well as the interface implementation, is also addressed. This interface is being introduced for measuring submicrometer displacements in medium-to high-resolution applications. The interface system consumes less than 12 mW and has an extremely low thermal drift. The interface circuit will be implemented as a system-in-a-package (SIP). The full-scale range of displacement is 1 mm with 50-kHz signal bandwidth and 11-bit resolution (less than 500 nm). The signal conditioning circuit utilizes a standard 0.35-μm complementary metal-oxide semiconductor (CMOS) technology. Simulation results, which were achieved on the basis of experimental results of testing a prototype coil, also confirm the high performance of the interface system, as expected from analytical results. Compared with previous reports, this low-power interface system demonstrates a much lower temperature drift.

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Contribution to the development of a smart sensor using eddy currents for measurement of displacement

Cited by 19 publications

References 7 publications

A smart flat-coil eddy-current sensor for metal-tag recognition

A smart flat-coil eddy-current sensor for metal-tag recognition

A novel method for sensing rotational speed, linear displacement and current using superconducting BPSCCO magnetic sensor

A Novel Interface for Eddy Current Displacement Sensors

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