CN101413910A - Method for measuring medium content and measuring instrument - Google Patents

Abstract

The invention provides a method used for measuring the content of internal medium of ion medium coexistence body such as milk, beers, blood, fermentation liquid, fruits, plant seeds, poultry eggs, human organs, concrete and hydrocarbon reservoirs and a measurement instrument thereof. The measurement instrument supplies alternative current for an object to be measured; voltage V and imaginary part current Ix are collected; the imaginary part resistance (resistivity) is calculated by a formula that Xc is equal to V/Ix and capacitance (permittivity) is calculated by a formula that C is equal to 1/2 Pi*FXc; the resonant frequency F0 of the object is collected; furthermore, two ends of the object to be measured are connected with a capacitor C1 in parallel; subsequently, the new resonant frequency F1 is measured; then, the capacitance (permittivity) C is calculated by a formula that C is equal to F<1><2>*C1(F<2><2>-F<1><2>); the permittivity C is defined to be equal to a second dielectric constant Epsilon T; finally, the content of the medium is directly indicated in a form that the Epsilon T is positively proportional to the content of the medium. When in application, the more the Epsilon T is, the higher the fermentation degree of the fermentation liquid is, the higher the content of erythrocyte in blood is, the higher the oil saturation in the hydrocarbon reservoir is and the greater the concrete strength is. The second dielectric constant Epsilon T can be self-determined in the application rule practice of other fields.

Description

The method of measuring media content and surveying instrument

Technical field

The present invention relates to a kind of agricultural science and technology, biotechnology, medical science, food, building, petroleum prospecting, multi-field middle a kind of method and the surveying instrument of measuring ionic medium coexisting body interior media content of cbm exploration.

Background technology

In the prior art, Measuring Object specific inductive capacity basic skills is testee integral body to be positioned in the pair of conductive pole plate with state of insulation as medium to measure capacitance earlier, the capacitance that this capacitance is measured during for vacuum with medium is compared again, and its multiple is decided to be relative dielectric constant ε (first specific inductive capacity).This method is applicable to analyzes the medium insulating property, but when being used in milk, beer, blood, fermentation liquor, fruit, vegetable seeds, birds, beasts and eggs, human organ, concrete, core, petroleum reservoir, this class ionic medium coexisting body of coalbed methane reservoir, the moisture index of main indication, this does not meet with the target that stresses to analyze medium content.A lot of fields need a kind of measuring method and surveying instrument of direct indication medium content when analyzing the ionic medium coexisting body.

Summary of the invention

The purpose of this invention is to provide a kind of measuring method and surveying instrument of directly indicating medium content at the ionic medium coexisting body.

A kind of measuring method of direct indication medium content is provided according to an aspect of of the present present invention, this method is characterised in that and adopts surveying instrument to supply with exchange current to testee that exchange current flows through the interior of articles medium and adds the capacitance path generation imaginary part electric current I that the both sides ion forms _X, adopt formula X _C=V/I _X(or X _C=R/tg θ or X _C=Z/sin θ or $X_C=Z*R/\sqrt{R^2-Z^2})$ Obtain imaginary part resistance (rate), adopt formula C=1/2 π FXc to obtain electric capacity (rate); Exchange current flows through testee and also produces resonance frequency F ₀, shunt capacitance C on testee ₁After can produce new resonance frequency F ₁, adopt formula C=F ₁ ²* C ₁/ (F ₀ ²-F ₁ ²) obtaining electric capacity (rate), the permittivity C that the present invention obtains equals second DIELECTRIC CONSTANT _T, last according to second DIELECTRIC CONSTANT _TDirectly indicate medium content with medium content positive correlation mode.

Provide a kind of surveying instrument according to an aspect of of the present present invention, this surveying instrument comprises signal source 1, current source 2, sample circuit 3, current measurement circuit 4, tension measuring circuit 5, phase measuring circuit 6, resonant capacitance case 7, calculate display system 8, A electrode 9, B electrode 10, signal source 1 produces AC signal and sends current source 2 to, current source 2 sends sample circuit 3 to, sample circuit 3 is gathered current signal and is sent current measurement circuit 4 to and send electric current to testee through A electrode 9, electric current flows through behind the testee by B electrode 10 return current sources 2, current measurement circuit 4 is gathered current signal from sample circuit 3 and is sent calculating display system 8 to after amplify arrangement, tension measuring circuit 5 is gathered voltage signal from A electrode 9 and send calculating display system 8 to after being amplified arrangement, the phase place that phase measuring circuit 6 is gathered current measurement circuit 4 and signal source 1 carries out being conveyed into calculating display system 8 after the phase difference measurement arrangement, calculate display system 8 data are calculated the record demonstration, resonant capacitance case 7 is parallel to A electrode 9 and B electrode 10 two ends.

Description of drawings

Fig. 1 is ionic medium coexisting body equivalent circuit theory figure;

Fig. 2 is an ionic medium coexisting body surveying instrument theory diagram.

Embodiment

Physical basis of the present invention is measured ionic medium coexisting body to be regarded as be the equivalent electrical circuit in parallel with electric capacity after the resistance series inductance as shown in Figure 1, wherein resistance is determined by the ionic conduction ability, electric capacity is by medium insulating property and the decision of volume form, and inductance is by tortuous degree in ionic conduction path and magnetisable material decision.

Measuring method of the present invention is to supply with exchange current by surveying instrument to testee, and exchange current flows through object can produce voltage V, real part electric current I _R(electric current of the ion channel of flowing through), imaginary part electric current I _X(the interior of articles medium of flowing through adds the electric current of the electric capacity passage of both sides ion formation), mould electric current I _Z, the phase theta signal, adopt formula X _C=V/I _X(or X _C=R/tg θ or X _C=Z/sin θ or $X_C=Z*R/\sqrt{R^2-Z^2})$ Obtain imaginary part resistance (rate), make imaginary part resistance (rate) X=capacitive reactance (rate) X _C(faint the ignoring of inductance contribution) adopts formula C=1/2 π FXc to obtain electric capacity (rate); Exchange current flows through testee and also produces resonance frequency F ₀, shunt capacitance C on testee ₁After can produce new resonance frequency F ₁, adopt formula C=F ₁ ²* C ₁/ (F ₀ ²-F ₁ ²) obtaining electric capacity (rate), the permittivity C that makes the present invention obtain equals second DIELECTRIC CONSTANT _T, last according to second DIELECTRIC CONSTANT _TDirectly indicate medium content with medium content positive correlation mode.

Surveying instrument of the present invention comprises signal source 1, current source 2, sample circuit 3, current measurement circuit 4, tension measuring circuit 5, phase measuring circuit 6, resonant capacitance case 7, calculate display system 8, A electrode 9, B electrode 10, signal source 1 produces AC signal and sends current source 2 to, current source 2 sends sample circuit 3 to, sample circuit 3 is gathered current signal and is sent current measurement circuit 4 to and send electric current to testee through A electrode 9, electric current flows through behind the testee by B electrode 10 return current sources 2, and current measurement circuit 4 uses the same-phase detection to obtain the real part electric current I after sample circuit 3 is gathered current signals _R, use 90 ° of detections of phase shift to obtain the imaginary part electric current I _X, use the auto-correlation detection to obtain the mould electric current I _ZSend calculating display system 8 to through amplifying arrangement then, tension measuring circuit 5 is gathered voltage signal from A electrode 9 and send calculating display system 8 to after being amplified arrangement, the phase place that phase measuring circuit 6 is gathered current measurement circuit 4 and signal source 1 (or current source 2) carries out being conveyed into calculating display system 8 after the phase difference measurement arrangement, calculate display system 8 data are calculated the record demonstration, resonant capacitance case 7 is parallel to A electrode 9 and B electrode 10 two ends.

Provide the parameter acquisition embodiment according to measuring method and surveying instrument, surveying instrument energising back is supplied with exchange current from the trend testee and is gathered measurement parameter simultaneously automatically, and exchange current is flowed through and can be formed voltage V, real part electric current I behind the object _R, the imaginary part electric current I _X, the mould electric current I _Z, phase theta, resonance frequency F ₀Signal, first kind of scheme is to gather voltage V to add the imaginary part electric current I _X, with formula X _C=V/I _XCalculate imaginary part resistance (rate), calculate electric capacity (rate) with formula C=1/2 π FXc; Second kind of scheme is to gather voltage V, real part electric current I r, phase theta, calculates real part resistance (rate), X with formula R=V/Ir _C=R/tg θ calculates imaginary part resistance (rate), calculates electric capacity (rate) with formula C=1/2 π FXc; The third scheme is to gather voltage V, telegram in reply stream I _Z, phase theta, with formula Z=V/I _ZCalculate complex impedance (rate), X _C=Z/sin θ calculates imaginary part resistance (rate), calculates electric capacity (rate) with formula C=1/2 π FXc; The 4th kind of scheme is to gather voltage V, real part electric current I r, telegram in reply stream I _Z, with formula R=V/Ir, Z=V/I _Z, $X_C=Z*R/\sqrt{R^2-{\mathrm{<figure-callout\; id="2"\; label="Z"\; filenames="A200710050298E00082.png"\; state="\{\{state\}\}">Z</figure-callout>}}^2}$ Calculate imaginary part resistance (rate), calculate electric capacity (rate) with formula C=1/2 π FXc; The 5th kind of scheme is the resonance frequency F of first Measuring Object self ₀, connect resonant capacitance case (7) shunt capacitance C again ₁New resonance frequency F is measured in the back ₁, then with formula C=F ₁ ²* C ₁/ (F ₂ ²-F ₁ ²) calculate electric capacity (rate) C.

When the low first to fourth kind of acquisition scheme of appropriate to the occasion employing of testee interior media content ratio, preferably, select second kind of scheme for use.

When the 5th kind of acquisition scheme of the higher appropriate to the occasion employing of testee interior media content ratio, preferably, adjust capacitor C ₁Make $\sqrt{2}{\mathrm{<figure-callout\; id="1"\; label="F"\; filenames="A200710050298E00082.png"\; state="\{\{state\}\}">F</figure-callout>}}_1=F_0,$ C then ₀=C ₁

The permittivity C of above-mentioned all computation schemes equals second DIELECTRIC CONSTANT _T

Parameter application regularity of the present invention is strong, second DIELECTRIC CONSTANT when measuring fermentation liquor _TBig more attenuation degree is high more; Second DIELECTRIC CONSTANT when measuring blood _TBig more red blood cell content is high more; Second DIELECTRIC CONSTANT when measuring hydrocarbon zone _TBig more oil saturation is high more; Second DIELECTRIC CONSTANT when measuring concrete _TBig more concrete strength is big more.Second DIELECTRIC CONSTANT _TIn the application regularity practice in other field, can determine voluntarily.

Claims (2)

1. A kind of measuring method of direct indication medium content adopts surveying instrument to supply with exchange current to testee, and exchange current flows through the interior of articles medium and adds the capacitance path generation imaginary part electric current I x that the both sides ion forms, and adopts formula X _C=V/Ix (or X _C=R/tg θ or X _C=Z/sin θ or $X_C=Z*R/\sqrt{R^2-Z^2})$ Obtain imaginary part resistance (rate), adopt formula C=1/2 π FXc to obtain electric capacity (rate); Exchange current flows through testee and also produces resonance frequency F ₀, shunt capacitance C on testee ₁After can produce new resonance frequency F ₁, adopt formula C=F ₁ ²* C ₁/ (F ₀ ²-F ₁ ²) obtaining electric capacity (rate), the permittivity C that order is obtained equals second DIELECTRIC CONSTANT _T, last according to second DIELECTRIC CONSTANT _TDirectly indicate medium content with medium content positive correlation mode.
2. 

   A kind of surveying instrument, comprise signal source (1), current source (2), sample circuit (3), current measurement circuit (4), tension measuring circuit (5), phase measuring circuit (6), resonant capacitance case (7), calculate display system (8), A electrode (9), B electrode (10), signal source (1) produces AC signal and sends current source (2) to, current source (2) sends sample circuit (3) to, sample circuit (3) is gathered current signal and is sent current measurement circuit (4) to and send electric current to testee through A electrode (9), electric current flows through behind the testee by B electrode (10) return current source (2), current measurement circuit (4) uses the same-phase detection to obtain the real part electric current after sample circuit (3) is gathered current signal, use 90 ° of detections of phase shift to obtain the imaginary part electric current, use the auto-correlation detection to obtain the mould electric current and give calculating display system (8) through amplifying arrangement then, tension measuring circuit (5) is gathered voltage signal from A electrode (9) and give calculating display system (8) after being amplified arrangement, phase measuring circuit (6) is gathered the phase place of current measurement circuit (4) and signal source (1) (or current source (2)) and is carried out sending into calculating display system (8) after the phase difference measurement arrangement, calculate display system (8) data are calculated the record demonstration, resonant capacitance case (7) is parallel to A electrode (9) and B electrode (10) two ends.

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