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Electromagnetic chromatographic imaged phase-based feedback search signal demodulating equipment and its method

A technology of electromagnetic tomography and signal search, which is applied in the field of measurement to achieve the effect of fast speed and accurate test data

Inactive Publication Date: 2004-09-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The general demodulation method is difficult to meet this requirement

Method used

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  • Electromagnetic chromatographic imaged phase-based feedback search signal demodulating equipment and its method
  • Electromagnetic chromatographic imaged phase-based feedback search signal demodulating equipment and its method
  • Electromagnetic chromatographic imaged phase-based feedback search signal demodulating equipment and its method

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, the implementation of the present invention is described in detail as follows:

[0030] exist figure 1 Among them, the computer 1, the excitation signal generator 2, the excitation signal amplifier 3, the sensor 4, the detection signal amplifier 5, the multi-way switch 6, the multiplier 7, the filter 8, the A / D converter 9 and the computer 1 are sequentially connected by conductors . The demodulation signal generator 10 is respectively connected to the computer 1 and the multiplier 7 by conductors, and the excitation signal generator 2 is also connected to the multi-way switch 6 by conductors. in,

[0031] 1. Computer 1: used to generate the control signal C of the excitation signal generator 2 E and the control signal C of the demodulation signal generator 10 D , and complete the reading of the output result of the A / D converter 9 at the same time.

[0032] 2. Excitation signal generator 2: It can be composed of elec...

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Abstract

The invented computer, actuating signal generator, actuating signal amplifier, sensor, detection signal amplifier, multiway switch, multiplier, filter and A / D converter are connected with computer in turn by means of conductor, its demodulation signal generator is respectively connected with computer and multiplier by means of conductor, and the actuating signal generator is also connected with multiway switch by means of conductor. Said invention is a non-contact non-inserted and harmless measuring instrument, when it is used, the measured signal in the electromagnetic chromatographic image system and its amplitude are undergone the processes of actuating, demodulating, calculation and processing, etc. so as to implement signal demodulation and process based on phase feedback search.

Description

technical field [0001] The invention belongs to the category of measurement, and in particular relates to a measurement processing device and a control method for the spatial distribution of electromagnetic substances. Background technique [0002] Electromagnetic Tomography (Electromagnetic Tomography, EMT) is a tomography technology developed in the early 1990s based on a new process of electromagnetic induction. Sweeping the measured object field with certain magnetic permeability material distribution or electrical conductivity material distribution, based on the principle of electromagnetic induction, the magnetic permeable material in the object field will form an induced magnetic field, and the conductive material will generate eddy currents, which will affect the original There is an exciting magnetic field to produce modulation, and the superposition of the two will generate induced potentials of different amplitudes and phases i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00G01N27/72G01N27/90
Inventor 徐苓安刘泽
Owner TIANJIN UNIV