Earth dielectric spectrum detecting method

A detection method and dielectric spectrum technology, applied in dielectric performance measurement, seismic measurement, geophysical measurement, etc., can solve problems such as the existence of the geodetic electric field, large electrode distance, interference factors, etc., to eliminate non-precursor interference, device The system is simple and the effect of broad application prospects

Active Publication Date: 2018-11-13
NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the object of the dielectric spectrum observation is the earth, which is characterized by: first, the presence of the earth electric field and other various interference factors; Effects of Electromagnetic Coupling Between Wires

Method used

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  • Earth dielectric spectrum detecting method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The dielectric spectrum observation device is deployed in the survey area. Such as figure 1 As shown, the observation device consists of four electrodes and their connecting wires, an audio signal generator, and a data acquisition analyzer. Four electrodes are used to overcome the effect of electrode polarization. Among the four electrodes, A and B are a pair of power supply electrodes, which supply excitation current of a specific frequency to the two electrodes of A and B, and M and N are a pair of measurement electrodes, which are connected to a data analyzer with high input impedance.

[0065] Main Specifications:

[0066] Frequency range: 20Hz~20kHz;

[0067] Input impedance of data acquisition device: input resistance value ≥ 1GΩ, input capacitance ≤ 100pf;

[0068] The maximum allowable error of voltage measurement: ±(0.02% of reading+300uV)@20℃;

[0069] Voltage measurement resolution: ±20uV(DC)@1V;

[0070] Current measurement resolution: ±20uA(DC)@1A;

...

Embodiment 2

[0081] This embodiment introduces a method of utilizing the device in Embodiment 1 to detect the dielectric spectrum of the earth, such as figure 2 As shown, specifically:

[0082] Step 1, using the dielectric spectrum detection device to collect survey area data, including the current passing through the power supply electrode and the voltage on the measurement electrode;

[0083] Step 2. Draw the dielectric spectrum of the survey area, including:

[0084] (1) Use complex numbers to express the measured voltage and current, and calculate the earth complex permittivity value of each measurement frequency point f in the measurement area, which is divided into real part and imaginary part (ε, ε″);

[0085] (2) Draw the dielectric spectrum diagram of the complex permittivity of the earth in the survey area, the abscissa axis is the angular frequency ω=2πf, and the ordinate is the real part and the imaginary part respectively;

[0086] Step 3. According to the number of maximum...

Embodiment 3

[0100] The difference from Example 2 is that the number of earth dielectric relaxations in the survey area is determined to be n=3. At this time, the dielectric relaxations are the relaxation of the superficial and shallow soil medium, the relaxation of the lower layer rocks and the ion polarization relax.

[0101] at this time,

[0102] Step 4, decompose the dielectric spectrum into three, and perform the following operations on the dielectric spectrum:

[0103] Find the angular frequency point ω corresponding to each maximum value of the imaginary part O1 ,ω O2 ,ω O3 , which is the relaxation angular frequency;

[0104] Find each minimum value of the imaginary part, divide the dielectric spectrum into three frequency bands with the angular frequency point corresponding to the minimum value as the boundary, and draw the curves of the imaginary part respectively. The imaginary part of the dielectric constant is at the lowest electromagnetic frequency The value is denoted ...

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Abstract

The invention discloses an earth dielectric spectrum detecting method. The earth dielectric spectrum detecting method comprises the steps of segmenting a dielectric spectrogram of a detected region toobtain an actually detected dielectric spectrogram and calculating a perfect dielectric spectrogram; and further correcting a perfect complex dielectric constant analytic formula through a model function to obtain an actual earth complex dielectric constant analytic formula. A dielectric spectroscopy is introduced in earthquake precursor observation, and is a new active fault and crustal movementobservation method; the earth dielectric spectrum detecting method can be used for earthquake safety evaluation and earthquake precursor monitoring of a key project; and in underground fluid precursor observation, the method has wide application prospect.

Description

technical field [0001] The invention relates to the technical field of earthquake precursor observation, in particular to a method for detecting and observing earthquakes by using the dielectric spectrum of the earth. Background technique [0002] Dielectric spectroscopy is a method for studying the interaction of matter with electromagnetic fields. In the electrical vibration frequency band, its observation frequency includes microwave, radio frequency and audio frequency electromagnetic wave frequencies. Nobel laureate Peter Debye's famous treatise "Polar Molecules" laid the theoretical foundation for the dielectric spectroscopy method. After that, Cole K S, Cole R H.1941 revised the Debye model and proposed the Cole-Cole model and equations. The Maxwell-Wagner interface polarization theory laid the foundation for the dielectric theory of heterogeneous systems. In the 1960s, Hanai established the theoretical formula of dense systems and the quantitative method of Wagner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00G01N27/02G01R27/26
CPCG01N27/02G01R27/2617G01V1/008
Inventor 朱旭汪林陈俊峰
Owner NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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