Impedance-based measurement device with a two-dimensional array of coils

A technology of coils and measuring units, applied in measuring devices, material impedance, inductance, etc., can solve problems such as slowing down and changes in induced voltage, and achieve a clear positioning effect

Active Publication Date: 2015-10-07
PROCEQ SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if the coil is close to a metal reinforcement bar embedded in concrete, the average magnetic permeability μ and electrical conductivity σ in the field range, and the resulting impedance of the coil will change, which leads to a slower decay of the induced voltage

Method used

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  • Impedance-based measurement device with a two-dimensional array of coils
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  • Impedance-based measurement device with a two-dimensional array of coils

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Embodiment Construction

[0015] definition:

[0016] The term "two-dimensional coil array" should be understood as the coils being arranged in a matrix on a plane or curved surface, a first number N1>1 of coils are arranged side by side in the row direction, and a second number N2>1 of coils are arranged side by side in the column direction , the row and column directions extend transversely to each other.

[0017] The term "impedance detection material based device" should be understood as a device for determining the properties of a sample material (eg concrete) by bringing a coil close to the material. A current pulse is fed to the coil, and the magnetic field of the coil builds up or decays as a function of the magnetic permeability μ and the electrical conductivity σ to which the field is subjected, depending on the composition of the material. Therefore, the device is suitable for determining properties that depend on the magnetic permeability μ and / or the electrical conductivity σ of the mater...

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PUM

PropertyMeasurementUnit
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Abstract

The device for the impedance-based probing of materials described herein comprises a two-dimensional array of coils (1) and a measurement unit (4) adapted to determine, for each coil (1), a parameter indicative of its impedance. A pulse generator (3) is able to generate current pulses in each coil (1). The circuitry drives and senses the coil array through row and column lines (rp1... rpN1, cp1... cpN2, c21... csN2) in order to minimize the number of required components. The device can, in particular, be used for probing concrete.

Description

technical field [0001] The invention relates to a device for detecting the electrical impedance of a material having at least one coil, a pulse generator for generating current pulses in the coil and a measuring unit for determining a parameter representing the impedance of the coil. Background technique [0002] The detection of materials such as reinforced concrete by means of electrical impedance measuring devices is known. Such a device includes a coil and a pulse generator for feeding current pulses to the coil. After each current pulse, the magnetic field produced by the coil decays and causes the induced voltage on the coil to decay. The decay of this voltage is a function of the coil impedance, which depends on the permeability μ and the electrical conductivity σ of the material within the field. For example, if the coil is brought close to a metal bar embedded in concrete, the average permeability μ and conductivity σ over the field range, and thus the impedance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02G01N33/38G01N27/90
CPCG01N27/904G01N33/383G01N27/025G01L21/30G01R27/2611G01R27/26
Inventor P·斯泰利
Owner PROCEQ SA
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