CN105699787B - Coal petrography dielectric constant measurement method based on impedance analyzer - Google Patents
Coal petrography dielectric constant measurement method based on impedance analyzer Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- 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
It is quickly, convenient in view of the deficiencies of the prior art, the present invention provides a kind of coal petrography dielectric constant measurement method based on impedance analyzer, accurately measure the dielectric constant of the coal mixed with rock.The instrument used is simplified, and measuring method is easy to implement, convenient for promoting on a large scale.
Description
Technical field
The present invention relates to coal petrography dielectric constant measurement technology more particularly to a kind of medium Jie based on precise impedance analyzer
Electric constant measuring method.
Background technology
Dielectric constant is a significant data for characterizing dielectric or insulating materials electrical property, and can be called relatively electric
Capacity rate or capacitivity.In EM theory, the interaction of medium and electromagnetic wave and field variation are mainly normal by studying dielectric
Number, so as to what is analyzed.The capacitance that dielectric constant refers in same capacitor with same substance when being dielectric and vacuum
Ratio, represent that dielectric stores the relative ability of electrostatic energy in the electric field, the smaller insulating properties of relative dielectric constant is better.It is different
The complex dielectric permittivity of substance is essentially different, and dielectric constant characterizes the interaction between medium and electromagnetic field.
With the development of microwave technology, microwave detection obtains increasingly in the researchs such as industrial agricultural production, national defense construction
It is widely applied.Microwave detection usually using the variation of medium dielectric property at microwave frequencies, as microwave by after medium its
The variation of attenuation or phase shift detects various non-electrical physical quantitys.
When mining excavation is carried out in underground, the rock of certain content is had among the coal that coalcutter excavates.Coal
The higher the better for content, and the quality of coal is softer, and the lower the content of rock the better, and quality is harder, when mining, due to rock
It is harder, the knife face of coalcutter can be damaged.Therefore, the content of the coal of coalcutter excavation regions is reasonably controlled during coal mining
It is particularly significant, while coal content is ensured, rock content is reduced as possible.Based on this, in exploitation, can be contained by measuring coal
It measures to determine whether to carry out current region exploitation.Coal content measurement can be realized by measuring its dielectric constant.Therefore, dielectric
Constant has important application value in the measurement of coal content.
At present, the measuring method of dielectric constant has following several classes：Frequency-domain transmission method, time domain transmission, noise correlation method are humorous
The methods of cell method of shaking.Frequency-domain transmission method is to measure the most ripe method of material dielectric constant.Low-frequency range using vector impedance method and
Bridge method；Microwave frequency band uses standing wave method, Network Analyzer method and Six―port technique.With the development of tunable laser, sub- milli
Metric wave, it is infrared, it is seen that the frequency ranges such as light or X ray can use frequency-domain transmission technology.Time domain method can be divided into fast-response and slow sound
Should, slow-response is mainly by measuring the charging and discharging curve of capacitance, the relaxation behavior under inverting material very low frequency.Fast-response can by when
The data that domain measures are transformed into frequency domain.At this point, frequency-domain transmission method and time domain method Dual Method each other.Noise correlation method be it is infrared with
Super band measures the effective ways of material dielectric constant, in recent years the trend of oriented low-frequency range development.Resonant-cavity Method is microwave frequency band
The method of Measuring Dielectric Constant needs that material size, influence of the wall size to measurement result are discussed.
The device of above-mentioned dielectric constant measurement method it is more complicated, promote the use of on a large scale be difficult.
Invention content
The purpose of the present invention is being directed to the deficiency of above-mentioned technology, a kind of coal petrography dielectric constant based on impedance analyzer is provided
Measuring method, it is quickly, convenient, accurately measure the dielectric constant of the coal mixed with rock.The instrument used is simplified, and measuring method is held
It easily realizes, convenient for promoting on a large scale.
A kind of coal petrography dielectric constant measurement method based on impedance analyzer is claimed in the application, includes the following steps：
S101, on-resistance analyzer determine to test the stable frequency section of dielectric constant；
Wherein, impedance analyzer, including alternating current source, resistance, balance system, external-connected port, plane-parallel capacitor；
Measure plane-parallel capacitor blank state resonant frequency, and obtain capacitance can stable frequency section,
The capacitance of different material is measured for the later stage and resonant frequency establishes data basis；
S102 for the coal petrography mixture of various ratios, establishes resonant frequency f and the mathematical model a of permittivity ε；
After the coal petrography mixture of known various ratios is filled into plane-parallel capacitor, basis after impedance analyzer operation
Internal measuring state, for meeting automatic stabilisation in a frequency, this frequency is resonant frequency f；
Under resonant frequency f, measurement obtains capacitance C, public by the measurement of following plane-parallel capacitor dielectric constant
Formula, and then obtain the permittivity ε of substance；
Wherein, ε is the dielectric constant of medium between capacitor plate；D represents two parallel plate distances；S represents two parallel poles
Plate relative area；
So far, the resonant frequency f of the coal petrography mixture of various ratios and the mathematical model a of permittivity ε are obtained.
S103 for the coal petrography mixture of various ratios, for a certain coal petrography mixture, is adjusted inside impedance analyzer
Detection frequency f ', test the capacitances under different detection frequencies, and pass through the measure equation of plane-parallel capacitor dielectric constant
Be calculated different permittivity εs ', and then obtain permittivity ε ' with detection frequency f ' change trend curve, establish close
It is model b；
For the coal petrography mixture that dielectric constant is unknown, the coal petrography mixture is obtained with impedance analyzer measurement by S104
Resonant frequency F, and pass through resonant frequency f and the mathematical model a of permittivity ε, the dielectric constant of the coal petrography mixture is obtained, together
When the specific coal petrography ratio of the coal petrography mixture can be also known by mathematical model a.
S105 according to the coal petrography mixture of the obtained special ratios of step S104, is extracted from step S103 and is corresponded to
The permittivity ε of the coal petrography mixture ' and with the relational model b of detection frequency f ' variations, so as to learn：As detection frequency f '
When changing, permittivity ε ' variation.
Further, in the S103, range desirable the detection frequency f ' between 10Hz to 120MHz, every
10MHz generates a detection signal.
Further, for the coal petrography mixture of ratio in common 11, the mathematical model a is as shown in the table：
Compared with prior art, the method provided by the present invention utilizes precise impedance analyzer, easy to operate, highly practical.
Description of the drawings
Fig. 1 is the circuit diagram implemented using precise impedance analyzer.
Specific embodiment
Below by specific embodiment, the invention will be further described, and following embodiment is descriptive, is not limit
Qualitatively, it is impossible to which protection scope of the present invention is limited with this.
Technical principle：The calculation formula of plane-parallel capacitor capacitance is
Wherein, ε is the dielectric constant of medium between capacitor plate；D represents two parallel plate distances；S represents two parallel poles
Plate relative area.
From formula as can be seen that the output capacitance of plane-parallel capacitor is inversely proportional with pole plate spacing, the right opposite between pole plate
Product is directly proportional,
It follows that there are certain relationships between permittivity ε and capacitance C.Can by measuring the capacitances of unknown materials,
Obtain dielectric constant.
The claimed coal petrography dielectric constant measurement method based on impedance analyzer of the application, includes the following steps：
S101, on-resistance analyzer determine to test the stable frequency section of dielectric constant；
In embodiments of the present invention, the precise impedance analyzer is Shanghai Ke Erweien electronics corporations, model
6500B.Wherein, as shown in Figure 1, including alternating current source, resistance, balance system is external for the circuit structure inside impedance analyzer
The parts such as port, plate condenser.
Measure plane-parallel capacitor blank state resonant frequency, and obtain capacitance C can stable frequency section,
The capacitance C of different material is measured for the later stage and resonant frequency establishes data basis.
S102 for the coal petrography mixture of various ratios, establishes resonant frequency f and the mathematical model a of permittivity ε；
After the coal petrography mixture of known various ratios is filled into plane-parallel capacitor, basis after impedance analyzer operation
Internal measuring state, for meeting automatic stabilisation in a frequency, this frequency is resonant frequency f；
Under resonant frequency f, measurement obtains capacitance C, public by the measurement of following plane-parallel capacitor dielectric constant
Formula, and then obtain the permittivity ε of substance.
Wherein, ε is the dielectric constant of medium between capacitor plate；D represents two parallel plate distances；S represents two parallel poles
Plate relative area.
So far, the resonant frequency f of the coal petrography mixture of various ratios and the mathematical model a of permittivity ε are obtained.
In embodiments of the present invention, the known media is 11 kinds, measures its dielectric constant at the resonant frequency fx, obtains
11 groups of basic datas, as the basis for establishing the mathematical model between resonant frequency f and permittivity ε.
The known media is 11 kinds, measures its dielectric constant at the resonant frequency fx.It is as shown in the table：
S103 for the coal petrography mixture of various ratios, for a certain coal petrography mixture, is adjusted inside impedance analyzer
Detection frequency f ', test the capacitances under different detection frequencies, and pass through the measure equation of plane-parallel capacitor dielectric constant
Be calculated different permittivity εs ', and then obtain permittivity ε ' with detection frequency f ' change trend curve, establish close
It is model b；
A kind of substance can obtain fixed dielectric constant, but work as measuring environment in the case where determining detection frequency and measuring environment
It changes, dielectric constant can also change.Frequency can lead to the variation of substance internal structure, in general, dielectric constant
It can reduce with the raising of detection frequency.
In present example, the desirable ranges of frequency f ' of signal are detected between 10Hz to 120MHz, it can be every
10MHz generates a detection signal.
For the coal petrography mixture that dielectric constant is unknown, the coal petrography mixture is obtained with impedance analyzer measurement by S104
Resonant frequency F, and pass through resonant frequency f and the mathematical model a of permittivity ε, the dielectric constant of the coal petrography mixture is obtained, together
When the specific coal petrography ratio of the coal petrography mixture can be also known by mathematical model a.
For example, certain coal petrography mixture, obtains resonant frequency F=50MHz using impedance analyzer measurement, can obtain the coal
The dielectric constant of rock mixture is 3.57, and coal petrography ratio is 1：1.
S105 according to the coal petrography mixture of the obtained special ratios of step S104, is extracted from step S103 and is corresponded to
The permittivity ε of the coal petrography mixture ' and with the relational model b of detection frequency f ' variations, so as to learn：As detection frequency f '
When changing, permittivity ε ' variation.
Data basis is established, and then more effectively distinguish the ore deposit underground coal and rock for the processing in later stage purification as a result, carried
The high coefficient of mining of coal reduces the content of solid rock, can better ensure that the quality of coal.
It should be understood that the application of the present invention is not limited to the above, it for those of ordinary skills, can
To be improved or converted according to the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect range.
Claims (3)
1. a kind of coal petrography dielectric constant measurement method based on impedance analyzer, includes the following steps：
S101, on-resistance analyzer determine to test the stable frequency section of dielectric constant；
Wherein, impedance analyzer, including alternating current source, resistance, balance system, external-connected port, plane-parallel capacitor；
Measure plane-parallel capacitor blank state resonant frequency, and obtain capacitance can stable frequency section, after being
Phase measures the capacitance of different material and resonant frequency establishes data basis；
S102 for the coal petrography mixture of various ratios, establishes resonant frequency f and the mathematical model a of permittivity ε；
After the coal petrography mixture of known various ratios is filled into plane-parallel capacitor, according to inside after impedance analyzer operation
Measuring state, can automatic stabilisation in a frequency, this frequency be resonant frequency f；
Under resonant frequency f, measurement obtains capacitance C, by the measure equation of following plane-parallel capacitor dielectric constant, into
And obtain the permittivity ε of substance；
Wherein, ε is the dielectric constant of medium between capacitor plate；D represents two parallel plate distances；S represents two parallel plate electrode phases
To area；
So far, the resonant frequency f of the coal petrography mixture of various ratios and the mathematical model a of permittivity ε are obtained；
S103 for the coal petrography mixture of various ratios, for a certain coal petrography mixture, adjusts the inspection inside impedance analyzer
Measured frequency f ' tests the capacitance under different detection frequencies, and the measure equation for passing through plane-parallel capacitor dielectric constant calculates
Obtain different permittivity εs ', and then obtain permittivity ε ' with detection frequency f ' change trend curve, opening relationships mould
Type b；
For the coal petrography mixture that dielectric constant is unknown, the resonance of the coal petrography mixture is obtained with impedance analyzer measurement by S104
Frequency f, and pass through resonant frequency f and the mathematical model a of permittivity ε, the dielectric constant of the coal petrography mixture is obtained, while
The specific coal petrography ratio of the coal petrography mixture can be known by mathematical model a；
S105 according to the coal petrography mixture of the obtained special ratios of step S104, is extracted from step S103 corresponding to the coal
The permittivity ε of rock mixture ' and with the relational model b of detection frequency f ' variations, so as to learn：When detection frequency f ' generations
During variation, permittivity ε ' variation.
2. the method as described in claim 1, in the S103, range desirable the detection frequency f ' is arrived in 10Hz
Between 120MHz, a detection signal is generated every 10MHz.
3. the method as described in claim 1, for the coal petrography mixture of ratio in common 11, the mathematical model a is as follows
Shown in 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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