CN105699787A - Coal rock dielectric constant measure method based on impedance analyzer - Google Patents
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- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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Abstract
The invention provides a coal rock dielectric constant measure method based on an impedance analyzer aiming at the insufficiency of the prior art. The method can fast, conveniently and accurately measure a dielectric constant of coals doped with rocks. Instruments used in the method are simplified. The method is easy to implement, and facilitates large scope popularization.
Description
Technical field
The present invention relates to coal petrography dielectric constant measurement technology, particularly relate to a kind of dielectric permittivity measuring method based on precise impedance analyser。
Background technology
Dielectric constant is the significant data characterizing electrolyte or insulant electrical property, can be called again relative permitivity or dielectric constant。In EM theory, medium changes mainly through studying dielectric constant with electromagnetic interaction and field, thus be analyzed。Dielectric constant refers in same capacitor with the ratio that same substance is electric capacity when electrolyte and vacuum, and representing that electrolyte stores the relative ability of electrostatic energy in the electric field, the more little insulating properties of relative dielectric constant is more good。The complex dielectric permittivity of different material is essentially different, and dielectric constant characterizes the interaction between medium and electromagnetic field。
Along with the development of microwave technology, microwave detection is in industry agricultural production, and national defense construction etc. is increasingly widely applied in studying。Microwave detection generally utilizes the change of medium dielectric property at microwave frequencies, as microwave detects various non-electrical physical quantity by the change of its decay or phase shift after medium。
When down-hole carries out mining excavation, in the middle of the coal that coal-winning machine excavates, have the rock of certain content。The content of coal is more high more good, and the quality of coal is softer, and the content of rock is more low more good, and quality is harder, when mining, owing to rock is harder, can the knife face of coal-winning machine be caused damage。Therefore, the content of the coal reasonably controlling coal-winning machine excavation regions during coal mining is particularly significant, while guaranteeing coal content, reduces rock content as far as possible。Based on this, when exploitation, it is possible to determine whether to carry out current region exploitation by measuring coal content。Coal content measurement can realize by measuring its dielectric constant。Therefore, dielectric constant has important using value in the measurement of coal content。
At present, the methods such as the measuring method of dielectric constant has following a few class: frequency-domain transmission method, time domain transmission, noise method of correlation, Resonant-cavity Method。Frequency-domain transmission method is to measure the method that material dielectric constant is the most ripe。Low-frequency range adopts vector impedance method and bridge method；Microwave frequency band adopts standing wave method, Network Analyzer method and Six-port technique。Along with the development of tunable laser, submillimeter wave, infrared, it is seen that the frequency range such as light or X ray can adopt frequency-domain transmission technology。Time domain method can be divided into fast-response and slow-response, and slow-response is mainly through measuring the charging and discharging curve of electric capacity, the relaxation behavior under inverting material very low frequency。The data that time domain records can be transformed into frequency domain by fast-response。Now, frequency-domain transmission method and time domain method Dual Method each other。Noise method of correlation is the infrared effective ways measuring material dielectric constant with super band, the trend of oriented low-frequency range development in recent years。Resonant-cavity Method is the method for microwave frequency band Measuring Dielectric Constant, it is necessary to material size, the wall size impact on measurement result are discussed。
The device of above-mentioned dielectric constant measurement method more complicated, promotes the use of very difficult on a large scale。
Summary of the invention
It is an object of the invention to the deficiency for above-mentioned technology, it is provided that a kind of coal petrography dielectric constant measurement method based on electric impedance analyzer, quickly, convenient, measure the dielectric constant of the coal mixed with rock accurately。The instrument used is simplified, and measuring method easily realizes, it is simple to promote on a large scale。
The application is claimed a kind of coal petrography dielectric constant measurement method based on electric impedance analyzer, comprises the steps:
S101, on-resistance analyser, it is determined that the stable frequency separation of test dielectric constant；
Wherein, electric impedance analyzer, including alternating current source, resistance, balance system, external-connected port, plane-parallel capacitor；
Measure plane-parallel capacitor in the resonant frequency of blank state, and obtain capacitance and can stablize frequency separation, measure the capacitance of different material for the later stage and resonant frequency sets up data basis；
S102, for the coal petrography mixture of various ratios, sets up the mathematical model a of resonant frequency f and DIELECTRIC CONSTANT ε；
After the coal petrography mixture of known various ratios is filled into plane-parallel capacitor, according to internal measuring state after electric impedance analyzer operation, meeting automatic stabilisation is in a frequency, and this frequency is resonant frequency f；
Under this resonant frequency f, measure and obtain electric capacity C, by the measure equation of following plane-parallel capacitor dielectric constant, and then obtain the DIELECTRIC CONSTANT ε of material；
Wherein, ε is the dielectric constant of medium between capacitor plate；D represents two parallel plate electrode spacings；S represents two parallel plate electrode relative areas；
So far, it is thus achieved that the resonant frequency f of the coal petrography mixture of various ratios and the mathematical model a of DIELECTRIC CONSTANT ε。
S103, coal petrography mixture for various ratios, for a certain coal petrography mixture, adjust the detection frequency f ' within electric impedance analyzer, capacitance under test difference detection frequency, and obtain different DIELECTRIC CONSTANT ε ' by the measure equation calculating of plane-parallel capacitor dielectric constant, and then obtain the DIELECTRIC CONSTANT ε ' change trend curve with detection frequency f ', opening relationships model b；
S104, for the coal petrography mixture that dielectric constant is unknown, the resonant frequency F of this coal petrography mixture is obtained with electric impedance analyzer measurement, and by the mathematical model a of resonant frequency f with DIELECTRIC CONSTANT ε, obtain the dielectric constant of this coal petrography mixture, also can be known the concrete coal petrography ratio of this coal petrography mixture simultaneously by this mathematical model a。
S105, coal petrography mixture according to the step S104 special ratios obtained, the relational model b with detection frequency f ' change of the DIELECTRIC CONSTANT ε ' corresponding to this coal petrography mixture is extracted such that it is able to learn: when detecting frequency f ' and changing, the change of DIELECTRIC CONSTANT ε ' from step S103。
Further, in described S103, described scope desirable for detection frequency f ', between 10Hz to 120MHz, produces a detection signal every 10MHz。
Further, for the coal petrography mixture of ratio in common 11, described mathematical model a is as shown in the table:
Compared with prior art, the present invention provides method to utilize precise impedance analyser, simple to operate, practical。
Accompanying drawing explanation
Fig. 1 is the circuit diagram utilizing precise impedance analyser to implement。
Detailed description of the invention
Below by specific embodiment, the invention will be further described, and following example are illustrative, is not determinate, it is impossible to limit protection scope of the present invention with this。
Know-why: the computing formula of plane-parallel capacitor capacitance is
Wherein, ε is the dielectric constant of medium between capacitor plate；D represents two parallel plate electrode spacings；S represents two parallel plate electrode relative areas。
From formula it can be seen that the output capacitance of plane-parallel capacitor and polar plate spacing are inversely proportional to, amass to right opposite between pole plate and be directly proportional,
It follows that there is certain relation between DIELECTRIC CONSTANT ε and electric capacity C。Can pass through to measure the electric capacity of unknown materials, obtain dielectric constant。
The coal petrography dielectric constant measurement method based on electric impedance analyzer that the application is claimed, comprises the steps:
S101, on-resistance analyser, it is determined that the stable frequency separation of test dielectric constant；
In embodiments of the present invention, described precise impedance analyser is Shanghai Ke Erweien electronics corporation, and model is 6500B。Wherein, the circuit structure within electric impedance analyzer as shown in Figure 1, including alternating current source, resistance, balances the parts such as system, external-connected port, plate condenser。
Measure plane-parallel capacitor in the resonant frequency of blank state, and obtain capacitance C and can stablize frequency separation, measure the capacitance C of different material for the later stage and resonant frequency sets up data basis。
S102, for the coal petrography mixture of various ratios, sets up the mathematical model a of resonant frequency f and DIELECTRIC CONSTANT ε；
After the coal petrography mixture of known various ratios is filled into plane-parallel capacitor, according to internal measuring state after electric impedance analyzer operation, meeting automatic stabilisation is in a frequency, and this frequency is resonant frequency f；
Under this resonant frequency f, measure and obtain electric capacity C, by the measure equation of following plane-parallel capacitor dielectric constant, and then obtain the DIELECTRIC CONSTANT ε of material。
Wherein, ε is the dielectric constant of medium between capacitor plate；D represents two parallel plate electrode spacings；S represents two parallel plate electrode relative areas。
So far, it is thus achieved that the resonant frequency f of the coal petrography mixture of various ratios and the mathematical model a of DIELECTRIC CONSTANT ε。
In embodiments of the present invention, described known media is 11 kinds, measures its dielectric constant at the resonant frequency fx, obtains 11 groups of basic datas, as the basis of the mathematical model set up between resonant frequency f and DIELECTRIC CONSTANT ε。
Described known media is 11 kinds, measures its dielectric constant at the resonant frequency fx。As shown in the table:
S103, coal petrography mixture for various ratios, for a certain coal petrography mixture, adjust the detection frequency f ' within electric impedance analyzer, capacitance under test difference detection frequency, and obtain different DIELECTRIC CONSTANT ε ' by the measure equation calculating of plane-parallel capacitor dielectric constant, and then obtain the DIELECTRIC CONSTANT ε ' change trend curve with detection frequency f ', opening relationships model b；
A kind of material is being determined detection frequency and is being measured under environment, the dielectric constant that can be fixed, but changes when measuring environment, and dielectric constant also can change。Frequency can cause the change of material internal structure, and in general, dielectric constant can reduce along with the rising of detection frequency。
In present example, the scope desirable for frequency f ' of detection signal is between 10Hz to 120MHz, it is possible to produce a detection signal every 10MHz。
S104, for the coal petrography mixture that dielectric constant is unknown, the resonant frequency F of this coal petrography mixture is obtained with electric impedance analyzer measurement, and by the mathematical model a of resonant frequency f with DIELECTRIC CONSTANT ε, obtain the dielectric constant of this coal petrography mixture, also can be known the concrete coal petrography ratio of this coal petrography mixture simultaneously by this mathematical model a。
Such as, certain coal petrography mixture, use electric impedance analyzer measurement to obtain resonant frequency F=50MHz, it is possible to the dielectric constant obtaining this coal petrography mixture is 3.57, and coal petrography ratio is 1:1。
S105, coal petrography mixture according to the step S104 special ratios obtained, the relational model b with detection frequency f ' change of the DIELECTRIC CONSTANT ε ' corresponding to this coal petrography mixture is extracted such that it is able to learn: when detecting frequency f ' and changing, the change of DIELECTRIC CONSTANT ε ' from step S103。
Thus, data basis and then more effective difference this ore deposit underground coal and rock are set up in the processing purification for the later stage, improve the coefficient of mining of coal, reduce the content of solid rock, it is possible to better ensure that the quality of coal。
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, it is possible to improved according to the above description or convert, all these improve and convert the protection domain that all should belong to claims of the present invention。
Claims (3)
1., based on a coal petrography dielectric constant measurement method for electric impedance analyzer, comprise the steps:
S101, on-resistance analyser, it is determined that the stable frequency separation of test dielectric constant；
Wherein, electric impedance analyzer, including alternating current source, resistance, balance system, external-connected port, plane-parallel capacitor；
Measure plane-parallel capacitor in the resonant frequency of blank state, and obtain capacitance and can stablize frequency separation, measure the capacitance of different material for the later stage and resonant frequency sets up data basis；
S102, for the coal petrography mixture of various ratios, sets up the mathematical model a of resonant frequency f and DIELECTRIC CONSTANT ε；
After the coal petrography mixture of known various ratios is filled into plane-parallel capacitor, according to internal measuring state after electric impedance analyzer operation, meeting automatic stabilisation is in a frequency, and this frequency is resonant frequency f；
Under this resonant frequency f, measure and obtain electric capacity C, by the measure equation of following plane-parallel capacitor dielectric constant, and then obtain the DIELECTRIC CONSTANT ε of material；
Wherein, ε is the dielectric constant of medium between capacitor plate；D represents two parallel plate electrode spacings；S represents two parallel plate electrode relative areas；
So far, it is thus achieved that the resonant frequency f of the coal petrography mixture of various ratios and the mathematical model a of DIELECTRIC CONSTANT ε。
S103, coal petrography mixture for various ratios, for a certain coal petrography mixture, adjust the detection frequency f ' within electric impedance analyzer, capacitance under test difference detection frequency, and obtain different DIELECTRIC CONSTANT ε ' by the measure equation calculating of plane-parallel capacitor dielectric constant, and then obtain the DIELECTRIC CONSTANT ε ' change trend curve with detection frequency f ', opening relationships model b；
S104, for the coal petrography mixture that dielectric constant is unknown, the resonant frequency F of this coal petrography mixture is obtained with electric impedance analyzer measurement, and by the mathematical model a of resonant frequency f with DIELECTRIC CONSTANT ε, obtain the dielectric constant of this coal petrography mixture, also can be known the concrete coal petrography ratio of this coal petrography mixture simultaneously by this mathematical model a。
S105, coal petrography mixture according to the step S104 special ratios obtained, the relational model b with detection frequency f ' change of the DIELECTRIC CONSTANT ε ' corresponding to this coal petrography mixture is extracted such that it is able to learn: when detecting frequency f ' and changing, the change of DIELECTRIC CONSTANT ε ' from step S103。
2. the method for claim 1, in described S103, described scope desirable for detection frequency f ', between 10Hz to 120MHz, produces a detection signal every 10MHz。
3. the method for claim 1, for the coal petrography mixture of ratio in common 11, described mathematical model a is as shown in the table:
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| CN106932651A (en) * | 2017-03-23 | 2017-07-07 | 武汉理工大学 | Irregular shape is gathered materials the detection method of dielectric constant |
| CN110726880A (en) * | 2019-10-24 | 2020-01-24 | 国网重庆市电力公司电力科学研究院 | Method for evaluating aging state of capacitive bushing insulation system based on frequency domain and time domain |
| CN112730539A (en) * | 2020-12-23 | 2021-04-30 | 中山艾尚智同信息科技有限公司 | Detection equipment for sandstone moisture content based on interdigital capacitor |
| CN114856708A (en) * | 2022-05-27 | 2022-08-05 | 中国矿业大学(北京) | Coal gangue dynamic identification method and device based on dielectric constant difference |
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| CN106932651A (en) * | 2017-03-23 | 2017-07-07 | 武汉理工大学 | Irregular shape is gathered materials the detection method of dielectric constant |
| CN110726880A (en) * | 2019-10-24 | 2020-01-24 | 国网重庆市电力公司电力科学研究院 | Method for evaluating aging state of capacitive bushing insulation system based on frequency domain and time domain |
| CN112730539A (en) * | 2020-12-23 | 2021-04-30 | 中山艾尚智同信息科技有限公司 | Detection equipment for sandstone moisture content based on interdigital capacitor |
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