CN105137199A - Network analyzer-based dielectric constant measuring method - Google Patents
Network analyzer-based dielectric constant measuring method Download PDFInfo
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Abstract
The method discloses a network analyzer-based dielectric constant measuring method. The method includes the following steps that: detection circuit parameters are adjusted through utilizing a network analyzer and a network detection circuit; phase change before and after electromagnetic waves pass through a dielectric of which the dielectric constant is known is measured with a set frequency, and corresponding phase difference can be obtained; the relationship between the phase difference and the dielectric constant is fitted, so that a relationship model can be established; detection signal frequency is adjusted, and measurement is performed again, and the relationship model of the phase difference and the dielectric constant is established repeatedly until an optimal detection frequency and a corresponding optimal detection relationship model are obtained; phase change before and after electromagnetic waves pass through a dielectric of which the dielectric constant is unknown is measured with the optimal detection frequency, so that corresponding phase difference can be obtained; and the dielectric constant of the dielectric of which the dielectric constant is unknown can be calculated through utilizing the optimal detection model. The network analyzer-based dielectric constant measuring method provided by the invention has the advantages of operational simplicity, low cost and easiness in popularization. According to the method, a non-comprehensive network analyzer can be adopted.
Description
Technical field
The present invention relates to dielectric constant measurement technology, particularly relate to a kind of dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument.
Background technology
In Electromagnetic theory, the interaction of electromagnetic wave and medium and field change mainly to be analyzed by the specific inductive capacity studying its medium, because the complex permittivity of different material is essentially different, it characterizes the interaction between medium and electromagnetic field, has reacted medium electric field energy and has stored and loss size; Also be utilize specific inductive capacity to go research physically researchist at the different dielectric of research and character thereof; In microwave remote sensing field, the specific inductive capacity of typical feature is that its research atural object is as the key component of the scattering properties of soil, vegetation, dark woods, seawater, ice and snow etc.; Because terrestrial object information received in microwave remote sensing study mechanism, a part reflects the geometric properties of target, the relevant information of what all the other almost reflected is all specific inductive capacity.Therefore relevant terrestrial object information to be expected, the theoretical formula between these terrestrial object information and specific inductive capacity or empirical model must be set up, no matter be in the research of active microwave remote sensing or in the research of passive microwave remote sensing, containing the information of the specific inductive capacity of sample inside the microwave signal received, is the function about sample specific inductive capacity.In chemical, specific inductive capacity is an important parameter of reactive material characteristic.In the chemical reaction under microwave action, understand the equivalent complex permittivity of various common agents, its situation to microwave absorption and reflection can be understood further.In chemical industry, the measurement of specific inductive capacity is especially to Chemical Manufacture and substance characteristics research important in inhibiting.In microwave technical field, microwave technology advances just fast, and the demand for development microwave circuit of microwave technology is integrated, miniaturization, this promotes the development of microwave dielectric material and device.Microwave dielectric material and its principal performance of device are characterized by medium parameters such as the specific inductive capacity measured under microwave, dielectric loss, temperature coefficient of permittivity.The tissue, composition, structure, state etc. of edible vegetable oil all have close relationship with their dielectric property, research and understanding edible oil dielectric property can be analyzed the quality such as composition, tissue, state of edible oil and monitor better, also can effectively utilize dielectric property and carry out edible vegetable oil processing, so in edible vegetable oil Quality Detection, specific inductive capacity is also a very important parameter.
Except being used widely in above-mentioned field, Measuring Dielectric Constant also plays an important role in many fields of moisture measurement technology that needs, most typical as Jie's electrical survey soil moisture.In the physical quantity that dielectric medium dielectric constant microwave medium of science was for describing dielectric material polarized degree in the electric field originally, but the result of study of soil physics shows that soil dielectric constant itself contains the abundant information of reflect soil quality and character.Utilize the homing method of statistical mathematics verified, what difference the constituent and the quality that no matter go up earth have, the real component of soil moisture content and water one earth mixtures complex permittivity is always in deterministic single-valued function relation, and the importance of this conclusion is that it shows that the mensuration of soil moisture content can be determined indirectly by the mensuration of watered ground specific inductive capacity.
At present, the measuring method of dielectric permittivity mainly contains following a few class: time domain reflectometry, transmission/reflectometry, multimode method, many Thickness Methods, Resonant-cavity Method and free-space Method etc.From measuring principle, two large classes can be divided into again: network parameter method resonant cavity method.Network parameter method mainly refers to and sample and sensor is considered as Single port or two-port network, utilizes said method to measure the parameter of its characterizing network characteristic, normally scattering parameter, complex reflection coefficient etc., extrapolates the specific inductive capacity of medium accordingly.Measure bandwidth based on the Transmission line method of transmission/reflection parameters because of having in network parameter method, measuring method is simple and precision is high, the features such as coaxial and Wave guide system are all suitable for are widely used.The method is proposed in nineteen seventies by people such as Nicolson, Ross and Weir, is referred to as NRW transmission/reflectometry.In the method, detected materials sample is placed in air transfer line (waveguide or coaxial cable) and forms reciprocal two port network, by vector automation network analyzer (VectorNetworkAnalyzer, i.e. VNA) measure the scattering parameter of the two-port network of this transmission line, the relative dielectric constant of material is then finally inversed by by scattering aspect.Although the method has simple and has higher precision, simultaneously to advantages such as waveguide and coaxial system are all suitable for, still there is a lot of problems in the method.It is generally acknowledged that the selection of method for measuring complex dielectric constant depends primarily on the size etc. of the frequency of operation of sample, the height of dielectric constant values, the size of loss and sample.For these problems, on said method basis, scholars constantly study, and have occurred various new method of measuring thus.Such as, existing document (as: Tian Buning, microwave network analysis Recent Progress and applied research thereof, Xian Electronics Science and Technology University, 2002; Tian Buning etc., the straightforward procedure of microwave circuit substrate complex permittivity nondestructive measurement, Xian Electronics Science and Technology University's journal, 2002,04:543-546; Tian Buning etc., the some problem of transmission/reflection method for measuring complex permittivity of materials, electric wave science journal, 2002,01:10-15; Zhao Caijun etc., the coaxial transmission/reflection method for measuring complex permittivity of improvement, Chinese journal of scientific instrument, 2011,03:695-700; Jing Xinhui etc., based on the electromagnetic parameter of the transmission/reflection method for measuring RF Materials of coaxial cable, aerospace journal, 2005,05:630-634) thickness resonance of the complex permittivity of transmission/reflection method for measuring linear material, ambiguity, sample length (or thickness) and the errors in position measurement of sample in measured material are studied the impact of measurement result and solution; According to the theory of transmission/reflection method for measuring microwave absorbing material electromagnetic parameter, the measuring error of the length and sample position in coaxial cable that have studied tested sample on the impact of microwave absorbing material measuring electromagnetic parameters result, and proposes the scheme reducing error.
However, above-mentioned dielectric constant measurement method all also exists that instrument cost is high, the system architecture of measurement mechanism is complicated and require the problems such as higher to measurement sample, is difficult to apply on a large scale.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument, the method utilizes the specific inductive capacity of network analyzer measuring media, and the instrument cost of use is low, measuring system easily realizes, and is convenient to promote on a large scale.
Principle of the present invention is: electromagnetic wave velocity of propagation in media as well calculates by formula 1:
In formula 1: C is electromagnetic wave velocity of propagation (C=3 × 10 in a vacuum
8m/s), ε is the specific inductive capacity of medium.When the distance propagated does not change, then the square root of electromagnetic wave time of propagating in media as well and specific inductive capacity is directly proportional, and is namely expressed as formula 2:
In formula 2, k is constant.
Further, when electromagnetic frequency is certain, when the distance of propagation is constant, the pass of the phase differential that electromagnetic wave is propagated in media as well and specific inductive capacity is formula 3:
(formula 3)
In formula 3,
represent phase differential, ε represents specific inductive capacity, and 2 π fk are constant.
It can thus be appreciated that there is the funtcional relationship determined between the phase differential that electromagnetic wave is propagated in media as well and the specific inductive capacity of medium, the phase differential can propagating front and back by measuring electromagnetic wave in media as well obtains specific inductive capacity.Especially by the phase differential of measuring-signal before and after medium, the relation of matching specific inductive capacity and phase differential, to obtain the functional relation between specific inductive capacity and phase differential.The frequency of test signal, between 10MHz-210MHz, can compare the relational model related coefficient size between phase differential and specific inductive capacity that each frequency obtains by experiment, pick out best test frequency.The medium that Modling model selects specific inductive capacity known.According to the functional relation between specific inductive capacity and phase differential, specific inductive capacity can be obtained by phase differential.
Technical scheme provided by the invention is:
A dielectric permittivity measuring method for Excavation Cluster Based on Network Analysis instrument, comprises the steps:
1) utilize network analyzer and network testing circuit, adjust testing circuit parameter;
In embodiments of the present invention, described network analyzer is the network analyzer 250B test macro of S & A company of the U.S.; Described network testing circuit is pin network test circuit; Described testing circuit parameter mainly comprise detection signal frequency and for reduce error π network impedance match circuit in the resistance of each resistance.
Described network analyzer 250B test macro comprises signal generator, frequency counter, attenuator, power divider, 30dB attenuator, extender/line balance device, phasometer and voltage table; The signal generator of described 250B test macro produces a signal, after attenuator attenuates, by power divider, signal is divided into two path signal, a road is as reference signal after 30dB attenuator, and another road signal enters pin network test circuit after extender/line balance device; Described pin network test circuit is made up of two π type loops of symmetry, comprises input attenuator, output pad and detection probe; Described input attenuator and output pad are provided for the impedance of pin network and the matches impedances of 250B test macro; Described detection probe is parallel two-hand probe, and the distance of upper two probes of popping one's head in immobilizes; Signal obtains test signal after pin network; Phase differential and the amplitude fading of measuring reference signals and test signal is distinguished with phasometer and voltage table.
2) measure the phase place change of electromagnetic wave before and after the known medium of specific inductive capacity with setpoint frequency, obtain corresponding phase differential;
The medium that described specific inductive capacity is known is multiple.In embodiments of the present invention, the medium that described specific inductive capacity is known is 15 kinds; These specific inductive capacity are evenly distributed on 1 ~ 80.
3) relation between fit phase difference and specific inductive capacity, opening relationships model;
The relational model of described phase differential and specific inductive capacity is above-mentioned formula 3.
4) adjust detection signal frequency, repeat step 2) and 3), repeatedly set up phase differential and specific inductive capacity relational model, until draw optimum detection frequency and corresponding optimum detection relational model;
Detection signal frequency is specially between 10MHz ~ 210MHz and produces a test signal every 10MHz; Step 4) described optimum detection frequency, be specially and measure the phase differential of each frequency above-mentioned before and after the known medium of set multiple specific inductive capacity, specific inductive capacity square root and phase differential are carried out linear fit, the relatively size of relational model coefficient R that obtains of each frequency, choose related coefficient maximum time frequency be optimum detection frequency; Detect the phase differential obtained and specific inductive capacity square root under this detection frequency and carry out the relational model that linear fit obtains, as described optimum detection relational model.
5) with the phase place change of optimum detection frequency measurement electromagnetic wave before and after the medium of specific inductive capacity the unknown, corresponding phase differential is obtained;
6) step 4 is utilized) the optimum detection model that obtains, calculate the specific inductive capacity of the medium of specific inductive capacity the unknown, complete detection.
Compared with prior art, the invention has the beneficial effects as follows:
The invention provides a kind of dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument, by network analyzer measure phase difference transformation parameter, draw specific inductive capacity by the phase differential recorded, specifically comprise: utilize network analyzer and network testing circuit, adjust testing circuit parameter; Measure the phase place change of electromagnetic wave before and after the known medium of specific inductive capacity with setpoint frequency, obtain corresponding phase differential; Relation between fit phase difference and specific inductive capacity, opening relationships model; The duplicate measurements of adjustment detection signal frequency, sets up phase differential and specific inductive capacity relational model, repeatedly until draw optimum detection frequency and corresponding optimum detection relational model; With the phase place change of optimum detection frequency measurement electromagnetic wave before and after the medium of specific inductive capacity the unknown, obtain corresponding phase differential; Optimum detection model is utilized to calculate the specific inductive capacity of the medium of specific inductive capacity the unknown; The invention provides method simple to operate, and the network analyzer used can select the network analyzer of non-comprehensive, cost is lower, is easy to promote.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the inventive method.
Fig. 2 is the circuit diagram of network analyzer and pin network test;
Wherein, network analyzer comprises signal generator, frequency counter, attenuator, power divider, 30dB attenuator, extender/line balance device, phasometer and voltage table; The signal generator of network analyzer produces a signal, after attenuator attenuates, by power divider, signal is divided into two path signal, a road is as reference signal after 30dB attenuator, and a road signal enters pin network after extender/line balance device; π network is made up of two π type loops of symmetry, R
1, R
2and R
3form input attenuator, R
4, R
5and R
6form output pad; Be connected with measuring sonde in pin network, probe can select parallel two-hand to pop one's head in, and the distance of upper two probes of popping one's head in immobilizes.
Embodiment
Below in conjunction with accompanying drawing, further describe the present invention by embodiment, but the scope do not limited the present invention in any way.
The invention provides a kind of dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument, the method utilizes the specific inductive capacity of network analyzer measuring media, and the instrument cost of use is low, and measuring system easily realizes, and is convenient to promote on a large scale.
In the field of soil moisture measurement, specific inductive capacity is an effectively intermediate variable, very effectively can measure moisture contained in soil by Measuring Dielectric Constant.Utilize the measurement that the method for network analyzer measuring media specific inductive capacity just can be used for soil moisture, not only on cost, adopt TDR instrument (TimeDomainReflectomtry well below existing method, time-domain reflectomer) cost, and effectively and rapidly can measure soil moisture.
In recent years, food-safety problem more and more received popular concern.The necessity that edible vegetable oil is lived as the people, its safety problem is particularly important.Because its specific inductive capacity of different types of vegetable oil is essentially different, so the kind of oil can be detected by the specific inductive capacity measuring edible vegetable oil.
Fig. 1 is the FB(flow block) of the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument provided by the invention, uses the equipment of the dielectric permittivity measuring method of above-mentioned Excavation Cluster Based on Network Analysis instrument to comprise network analyzer, network testing circuit, medium module, optimum detection relational model module and specific inductive capacity that specific inductive capacity is known unknown medium detection computations module; Dielectric permittivity measuring method comprises the steps:
1) utilize network analyzer and network testing circuit, adjust testing circuit parameter;
Fig. 2 is the circuit diagram of network analyzer and pin network test.Wherein, network analyzer comprises signal generator, frequency counter, attenuator, power divider, 30dB attenuator, extender/line balance device, phasometer and voltage table; The signal generator of network analyzer produces a signal, after attenuator attenuates, by power divider, signal is divided into two path signal, a road is as reference signal after 30dB attenuator, and a road signal enters pin network after extender/line balance device; π network is made up of two π type loops of symmetry, R
1, R
2and R
3form input attenuator, R
4, R
5and R
6form output pad; Be connected with measuring sonde in pin network, probe can select parallel two-hand to pop one's head in, and the distance of upper two probes of popping one's head in immobilizes.
Need the testing circuit parameter of adjustment, mainly comprise detection signal frequency and for reduce error π network impedance match circuit in the resistance of each resistance.
Due to probe characteristic impedance in a liquid and probe match circuit impedance more close to time, then actual measurement data and theoretical model more identical.In order to obtain best impedance matching circuit, need the experiment doing impedance matching.The probe parameter that this test is used is respectively: R=0.014m; R=0.002m; Parallel wire formula transmission line equiva lent impedance computing formula:
wherein, R is the distance between two probes; R is probe radius; The specific inductive capacity of ε medium belonging to probe.
Utilizing above computing formula, by can be calculated the equiva lent impedance of probe in various medium, obtaining the impedance table of comparisons as shown in table 1.
The table 1 probe equiva lent impedance table of comparisons
| Medium | Specific inductive capacity | Equiva lent impedance/Ω |
| N-octyl alcohol | 10.24 | 72.97 |
| Isobutyl alcohol | 16.81 | 55.5 |
| Isopropyl alcohol | 20.25 | 54.59 |
| Ethanol | 24.5 | 47.18 |
| Alcohol-water (7:1) | 31.45 | 41.64 |
| Alcohol-water (4:1) | 35.65 | 39.11 |
| Alcohol-water (3:1) | 38.4 | 37.68 |
| Alcohol-water (2:1) | 43.03 | 35.6 |
| Alcohol-water (3:2) | 46.74 | 34.16 |
| Alcohol-water (1:1) | 52.3 | 32.29 |
| Alcohol-water (2:3) | 57.86 | 30.7 |
| Alcohol-water (1:2) | 61.57 | 29.76 |
| Alcohol-water (1:3) | 66.2 | 28.7 |
| Alcohol-water (1:5) | 70.83 | 27.75 |
| Alcohol-water (1:10) | 75.04 | 26.96 |
| Water | 80 | 26.1 |
According to the scope of above probe equiva lent impedance, R1 ~ R6 can choose following five groups of resistances and test respectively, in table 2, and wherein R
4, R
5, R
6and R
2, R
1, R
3correspondent equal.
Table 2 π lattice network resistance R
1, R
2, R
3the resistance table of comparisons
Experimental result shows, the resistance value of resistance R1 ~ R6 is respectively 53.6 Ω, 25.5 Ω, 976 Ω, 25.5 Ω, 53.6 Ω and 976 Ω; Or the resistance value of resistance R1 ~ R6 is respectively 158 Ω, 14.3 Ω, 66.5 Ω, 14.3 Ω, 158 Ω and 66.5 Ω.
2) measure the phase place change of electromagnetic wave before and after the known medium of specific inductive capacity with setpoint frequency, obtain corresponding phase differential;
The medium that described specific inductive capacity is known is multiple.In embodiments of the present invention, the medium that described specific inductive capacity is known is 15 kinds; These specific inductive capacity are evenly distributed on 1 ~ 80, as shown in table 3.
The specific inductive capacity (20 DEG C) of table 3 tested media
| Sequence number | Medium | Specific inductive capacity |
| 1 | Air | 1 |
| 2 | N-octyl alcohol | 10.24 |
| 3 | Isobutyl alcohol | 16.81 |
| 4 | Isopropyl alcohol | 20.25 |
| 5 | Ethanol | 24.5 |
| 6 | Alcohol-water (4:1) | 35.65 |
| 7 | Alcohol-water (3:1) | 38.4 |
| 8 | Alcohol-water (2:3) | 43.03 |
| 9 | Alcohol-water (3:2) | 46.74 |
| 10 | Alcohol-water (1:1) | 52.3 |
| 11 | Alcohol-water (2:3) | 57.86 |
| 12 | Alcohol-water (1:2) | 61.57 |
| 13 | Alcohol-water (1:3) | 66.2 |
| 14 | Alcohol-water (1:5) | 70.83 |
| 15 | Water | 80 |
3) relation between fit phase difference and specific inductive capacity, opening relationships model;
The pass of phase differential and specific inductive capacity is formula 3:
(formula 3)
In formula 3,
represent phase differential, ε represents specific inductive capacity, and 2 π fk are constant.
4) adjust detection signal frequency, repeat step 2) and 3), repeatedly set up the relational model of phase differential and specific inductive capacity, until draw optimum detection frequency and corresponding optimum detection relational model.
Detection signal frequency is specially between 10MHz ~ 210MHz and produces a test signal every 10MHz; Step 4) described optimum detection frequency, be specially and measure the phase differential of each frequency above-mentioned before and after the known medium of set multiple specific inductive capacity, specific inductive capacity square root and phase differential are carried out linear fit, the relatively size of relational model coefficient R that obtains of each frequency, choose related coefficient maximum time frequency be optimum detection frequency; Detect the phase differential obtained and specific inductive capacity square root under this detection frequency and carry out the relational model that linear fit obtains, as described optimum detection relational model.Wherein, coefficient R through type 4 obtains:
In formula 4, n counts for the test specimens of regretional analysis; x
iit is the specific inductive capacity i-th sampling point reality;
the mean value of all sampling point specific inductive capacity; y
iit is the specific inductive capacity obtained by the phase difference calculating recorded at i-th sampling point according to regression equation;
the average of all sampling point predicted values.Coefficient R reflects the correlativity between regression equation and measurement data, and the value of R, more close to 1, illustrates that the facies relationship between regression equation and test data is better.
5) with the phase place change of optimum detection frequency measurement electromagnetic wave before and after the medium of specific inductive capacity the unknown, corresponding phase differential is obtained;
6) step 4 is utilized) the optimum detection model that obtains, calculate the specific inductive capacity of the medium of specific inductive capacity the unknown, complete detection.
The network analyzer 250B test macro that the present invention adopts S & A company of the U.S. to produce and pin network test circuit are to measure the phase place change of electromagnetic wave after solution.Network analyzer is 250B test macro, comprises signal generator, frequency counter, attenuator, power divider, 30dB attenuator, extender/line balance device, phasometer and voltage table.The signal generator of 250B test macro produces a signal, after attenuator attenuates, by power divider, signal is divided into two path signal, a road is as reference signal after 30dB attenuator, and a road signal enters pin network after extender/line balance device.π network is made up of two π type loops of symmetry, comprises input attenuator, output pad and detection probe; Wherein, R
1, R
2and R
3form input attenuator, R
4, R
5and R
6form output pad, their effect makes the impedance of π network and the matches impedances of surveying instrument (250B test macro), be connected with measuring sonde in pin network, what probe was selected is parallel two-hand probe, and the distance of upper two probes of popping one's head in immobilizes.Signal obtains test signal after pin network, distinguishes phase differential and the amplitude fading of measuring reference signals and test signal with phasometer and voltage table.
The method needs first to demarcate with the medium that specific inductive capacity is known before implementing, the method of demarcating is: first with the phase place change of above-mentioned circuit measuring electromagnetic wave before and after the known medium of specific inductive capacity, then the relation between fit phase difference and specific inductive capacity, the parameter of Circuit tuning, Modling model repeatedly, until draw best test model, the medium of best model to specific inductive capacity the unknown obtained is utilized to detect.The method is mainly used to measure the specific inductive capacity of soil and then obtain the moisture of soil, also can be used for the specific inductive capacity measuring vegetable oil, identifies the kind of vegetable oil.
Below to detect the kind of edible vegetable oil (peanut oil), introduce the dielectric permittivity measuring method specific embodiment that the invention provides a kind of Excavation Cluster Based on Network Analysis instrument:
What the present embodiment Modling model was selected is 15 kinds of media that specific inductive capacity is known, and its specific inductive capacity is evenly distributed between 1 ~ 80.The frequency of test signal is selected between 10MHz-210MHz, compares the size of the coefficient R of the relational model between phase differential and specific inductive capacity that each frequency obtains by experiment, picks out best test frequency.
First need to adjust the parameter measured, mainly comprise frequency test signal adjustment and for reduce error π network impedance match circuit in the adjustment of each resistance.
In the present embodiment, the concrete method of adjustment of frequency test signal is: use network analyzer to produce a test signal every 10MHz between frequency is for 10MHz ~ 210MHz, measure the phase differential of each frequency before and after the known medium of 16 kinds of specific inductive capacity, specific inductive capacity square root and phase differential are carried out linear fit, the relatively size of relational model related coefficient that obtains of each frequency, choose related coefficient maximum time frequency be test frequency.
The concrete method of adjustment of each resistance of π network impedance match circuit: first calculate probe characteristic impedance in media as well.In theory, probe characteristic impedance is in media as well more close with the impedance of probe match circuit, then actual measurement data and theoretical model more identical.According to the characteristic impedance value calculated, several groups of resistances close to characteristic impedance got by probe match circuit, can by calculate in match circuit 6 resistance for resistance, and then 16 kinds of test mediums that specific inductive capacity is known are tested, the related coefficient of the more each group of model obtained, get related coefficient maximum time the probe match circuit impedance that obtains.In the present embodiment, the resistance value of resistance R1 ~ R6 is respectively 158 Ω, 14.3 Ω, 66.5 Ω, 14.3 Ω, 158 Ω and 66.5 Ω.
Chosen above-mentioned parameter (comprise frequency test signal and for reduce error π network impedance match circuit in the resistance of each resistance) after, with the phase differential of the circuit measuring single-frequency signals after adjustment through the known 16 kinds of media of specific inductive capacity, the square root of the phase differential obtained and specific inductive capacity is carried out linear fit, and model formation is
wherein
represent phase differential, ε
rrepresent specific inductive capacity, m is constant, m=2 π fk; By the value of m can be obtained after linear fit.
By the dielectric permittivity measuring method of above-mentioned Excavation Cluster Based on Network Analysis instrument, edible vegetable oil (peanut oil) is detected, such as, the peanut oil of three brands common on market can be chosen, as the peanut oil of Shandong flower, Jin Longyu and imperial famous brand, with the phase differential of said method measuring-signal after three brand peanut oil, according to the functional relation that said method obtains, the specific inductive capacity of peanut oil can be drawn, the scope of the specific inductive capacity of peanut oil qualified on market can be obtained.When needs detection judges that whether certain peanut oil is qualified, the specific inductive capacity of peanut oil to be detected can be measured by the method, again the specific inductive capacity recorded and the dielectric constant range of qualified peanut oil that obtains before are compared, if in the dielectric constant range of qualified peanut oil, then can judge to show that this peanut oil is qualified, if not in the dielectric constant range of qualified peanut oil, then can judge to show that this peanut oil is doped with other material, be not qualified peanut oil.
It should be noted that the object publicizing and implementing example is to help to understand the present invention further, but it will be appreciated by those skilled in the art that: in the spirit and scope not departing from the present invention and claims, various substitutions and modifications are all possible.Therefore, the present invention should not be limited to the content disclosed in embodiment, and the scope that the scope of protection of present invention defines with claims is as the criterion.
Claims (10)
1. a dielectric permittivity measuring method for Excavation Cluster Based on Network Analysis instrument, comprises the steps:
1) utilize network analyzer and network testing circuit, adjust testing circuit parameter;
2) with the phase place change of the detection signal frequency measurement electromagnetic wave set before and after the known medium of specific inductive capacity, corresponding phase differential is obtained;
3) fit procedure 2) relation between the phase differential that obtains and known dielectric constant, set up the relational model of phase differential and specific inductive capacity;
4) adjust detection signal frequency, repeat step 2) ~ 3), repeatedly set up phase differential and specific inductive capacity relational model, until draw optimum detection frequency and corresponding optimum detection relational model;
5) with the phase place change of optimum detection frequency measurement electromagnetic wave before and after the medium of specific inductive capacity the unknown, corresponding phase differential is obtained;
6) step 4 is utilized) the optimum detection model that obtains, calculate the specific inductive capacity of the medium of specific inductive capacity the unknown, complete detection.
2. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 1, is characterized in that, step 1) described network analyzer is the network analyzer 250B test macro of S & A company of the U.S.; Described network testing circuit is pin network test circuit.
3. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 2, it is characterized in that, step 1) described testing circuit parameter mainly comprise detection signal frequency and for reduce error π network impedance match circuit in the resistance of each resistance.
4. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 2, it is characterized in that, described network analyzer 250B test macro comprises signal generator, frequency counter, attenuator, power divider, 30dB attenuator, extender/line balance device, phasometer and voltage table; The signal generator of described 250B test macro produces a signal, after attenuator attenuates, by power divider, signal is divided into two path signal, a road is as reference signal after 30dB attenuator, and another road signal enters pin network test circuit after extender/line balance device.
5. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 2, it is characterized in that, described pin network test circuit is made up of two π type loops of symmetry, comprises input attenuator, output pad and detection probe; Described input attenuator and output pad are provided for the impedance of pin network and the matches impedances of 250B test macro; Described detection probe is parallel two-hand probe, and the distance of upper two probes of popping one's head in immobilizes; Signal obtains test signal after pin network; Phase differential and the amplitude fading of measuring reference signals and test signal is distinguished with phasometer and voltage table.
6. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 1, is characterized in that, step 2) medium that described specific inductive capacity is known is multiple.
7. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 6, is characterized in that, step 2) medium that described specific inductive capacity is known is 15 kinds of media that specific inductive capacity is evenly distributed on 1 ~ 80.
8. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 1, is characterized in that, step 3) relational model of described phase differential and specific inductive capacity is
(formula 3)
In formula 3,
represent phase differential; ε represents specific inductive capacity; 2 π fk are constant.
9. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 1, it is characterized in that, described detection signal frequency is specially between 10MHz ~ 210MHz and produces a test signal every 10MHz.
10. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 9, it is characterized in that, step 4) described optimum detection frequency, be specially and measure the phase differential of each frequency before and after the known medium of set multiple specific inductive capacity, specific inductive capacity square root and phase differential are carried out linear fit, the relatively size of relational model related coefficient that obtains of each frequency, choose related coefficient maximum time frequency be optimum detection frequency; Detect the phase differential obtained and specific inductive capacity square root under described optimum detection frequency and carry out the relational model that linear fit obtains, as described optimum detection relational model; Described relational model coefficient R through type 4 obtains:
In formula 4, n counts for the test specimens of regretional analysis; x
iit is the specific inductive capacity i-th sampling point reality;
the mean value of all sampling point specific inductive capacity; y
iit is the specific inductive capacity obtained by the phase difference calculating recorded at i-th sampling point according to regression equation;
the average of all sampling point predicted values.
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| CN106443198A (en) * | 2016-08-31 | 2017-02-22 | 东莞同济大学研究院 | Coaxial line testing method |
| 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 |
| CN106980095A (en) * | 2017-05-24 | 2017-07-25 | 中国电子科技集团公司第四十研究所 | A kind of Meta Materials electromagnetic parameter inversion method based on improvement K K algorithms |
| CN107543969A (en) * | 2016-06-29 | 2018-01-05 | 广州司南天线设计研究所有限公司 | The method of testing and device of a kind of dielectric constant |
| CN107991539A (en) * | 2018-01-31 | 2018-05-04 | 中国地质科学院地球物理地球化学勘查研究所 | Dielectric constant measuring apparatus and its system |
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| CN110687135A (en) * | 2019-09-29 | 2020-01-14 | 天津大学 | Water hardness measuring method of microwave coaxial probe sensor |
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| CN113970670A (en) * | 2021-09-29 | 2022-01-25 | 西安电子科技大学 | Foil strip air-mixed dielectric constant measuring method |
| CN113970670B (en) * | 2021-09-29 | 2022-08-09 | 西安电子科技大学 | Foil strip air-mixed dielectric constant measuring method, system, equipment, medium and terminal |
| CN113945764A (en) * | 2021-10-15 | 2022-01-18 | 中国人民解放军国防科技大学 | System and method for measuring dielectric constant of substance under composite field condition |
| CN113945764B (en) * | 2021-10-15 | 2023-11-21 | 中国人民解放军国防科技大学 | System and method for measuring dielectric constant of substance under composite field condition |
| CN115954071A (en) * | 2023-03-10 | 2023-04-11 | 西南交通大学 | Method for determining dielectric constant of wave-absorbing material |
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