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Device and method for multiphase-flow imaging measurement based on double-modal tomography

An imaging measurement and tomographic imaging technology, applied in the direction of material magnetic variable, material resistance, etc., can solve the problem of inability to simultaneously realize the measurement of conductive, magnetic and dielectric substances, the inability to measure magnetic and dielectric substances, and the inability to measure correctly and accurately Conductive substances, etc.

Inactive Publication Date: 2012-11-14
TIANJIN UNIV
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Problems solved by technology

However, these measurement methods also have their own limitations
For example: ECT cannot correctly and accurately measure conductive substances, while ERT cannot measure magnetically permeable and dielectric substances
None of them can simultaneously measure conductive, magnetic and dielectric substances

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  • Device and method for multiphase-flow imaging measurement based on double-modal tomography
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  • Device and method for multiphase-flow imaging measurement based on double-modal tomography

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0024] see figure 1 , The device in the present invention is composed of an excitation signal generation unit, a power amplifier, an analog gate switch, an excitation sensor, a receiving sensor, a signal conditioning and acquisition unit, and a host computer. An excitation sensor and a receiving sensor can form a sensing pair, and the excitation sensor and the receiving sensor cannot be exchanged. The excitation signal generation unit provides different excitation methods for the excitation coil, and the direct digital synthesis (DDS) chip AD7008 can be used, which can generate sinusoidal excitation signals with different amplitudes and phases. The amplitude and phase of the excitation signal can be set by the computer, amplified by the power amplifier and added to the excitation coil.

[0025] The upper computer controls the signal conditio...

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Abstract

The invention belongs to the technical field of electromagnetic sensors, and particularly relates to a device for measuring the roundness of wire rods on the basis of an electromagnetic sensor. The electromagnetic sensor comprises four identical coils paired into two groups of coil pairs, wherein the four coils are distributed on the same circle in a way that the line connecting the axes of the two coils in each group of coil pair passes through the center of the circle; a multi-channel analog switch is controlled by an upper computer to gate one pair of coils in the two groups of coil pairs at one step, wherein one coil is connected with the excitation signal output terminal of an inductance tester, and the other coil is connected with the measurement signal input terminal thereof; the inductances outputted by the inductance tester are respectively collected in the presence of a wire rod and in the absence of the wire rod and further imported into the upper computer; and the roundness of the wire rod can be judged by the upper computer according to the collected data. The invention provides a method using the device to measure the roundness of the wire rod at the same time. The invention has the biggest advantages that the roundness of the wire rod can be measured in a non-contact and real-time manner.

Description

technical field [0001] The invention belongs to the technical field of multiphase fluid imaging, and relates to a device based on dual-mode (ECT / EMT) tomographic imaging technology. technical background [0002] Multiphase flow phenomena widely exist in modern engineering fields such as petroleum, chemical industry, energy and power. The measurement of multiphase flow is of great significance to the monitoring and fault diagnosis of the production process. [0003] Electrical Tomography (ET) is a new tomography technology that emerged in the late 1980s. It uses non-invasive means to reveal the internal structure and parameter distribution of the measured object through tomographic imaging, and realizes visual measurement. It has broad application prospects in industrial and biomedical fields, and can realize long-term and continuous monitoring. Electrical tomography mainly includes Electrical Resistance Tomography (ERT), Electrical Capacitance Tomography (ECT), Electromag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/08G01N27/74
Inventor 尹武良赵倩
Owner TIANJIN UNIV
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