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Molten steel flow-speed measurement method and device based on electromagnetic tomography

A technology of electromagnetic tomography and flow velocity measurement, which is applied in the directions of measuring devices, fluid velocity measurement, velocity/acceleration/shock measurement, etc.

Inactive Publication Date: 2009-10-28
TIANJIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a measuring device and method suitable for measuring the flow rate of molten steel to solve the above-mentioned problems. The present invention uses dual electromagnetic tomography sensors for material distribution and flow rate measurement

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  • Molten steel flow-speed measurement method and device based on electromagnetic tomography
  • Molten steel flow-speed measurement method and device based on electromagnetic tomography
  • Molten steel flow-speed measurement method and device based on electromagnetic tomography

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0028] figure 1 There are a total of two electromagnetic tomography sensors installed upstream and downstream of the molten steel, and each sensor consists of a plurality of annular coil arrays evenly distributed on the same section. The signal generating unit adopts the direct digital synthesis (DDS) chip AD7008, which can generate sinusoidal excitation signals of different amplitudes and phases. The amplitude and phase of the excitation signal can be set by the computer, amplified by the power amplifier, and then installed on the excitation coil gated by the analog switch.

[0029] The computer controls the signal conditioning and acquisition unit to acquire the data sequence of the mutual inductance of the upstream and downstream sensors, wherein the sequence is controlled by the analog switch. Typically for the electromagnetic tomography...

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Abstract

The invention belongs to the technical field of fluid flow-speed detection and relates to a molten steel flow-speed measurement device based on electromagnetic tomography. The measurement device comprises an upstream sensor and a downstream sensor, a signal conditioning and collecting unit, a power amplifier and an upper computer. The upstream sensor and the downstream sensor are respectively composed of circular coil arrays. For each sensor, a coil is gated as an exciting coil sequentially, other coils are taken as receiving coils, an exciting signal is exerted on the exciting coil and induced signals of all the receiving coils are collected. The upper computer conducts image reconstruction respectively according to the upstream measurement data and downstream measurement data to obtain the respective electrical conductivity distribution image, and then conducts cross-correlation computation on two electrical conductivity distribution images based on pixel, thus obtaining the flow-speed distribution of molten steel. The invention provides a measurement method used for the device simultaneously. Under a non-contact situation, the device and the method can acquire the flow state of high temperature molten steel and has great realistic significance to the optimization of steel making process.

Description

technical field [0001] The invention belongs to the technical field of fluid flow velocity detection, and relates to a fluid flow velocity measurement device and method based on the principle of electromagnetic induction. Background technique [0002] Electromagnetic Tomography (EMT or Magnetic Induction Tomography, MIT) is a new type of tomography technology developed in the 1990s based on the principle of electromagnetic induction. It uses the excitation coil to generate a primary alternating magnetic field and interacts with the measured object; the measured object with different electromagnetic characteristics generates different secondary induced alternating magnetic fields at different frequencies, so measuring the secondary induced magnetic field can invert the measured object electromagnetic properties. The superposition of the secondary magnetic field and the primary magnetic field is proportional to the induced voltage of the measuring coil, and the induced voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/22
Inventor 尹武良
Owner TIANJIN UNIV
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