CN105137199B - The dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument - Google Patents
The dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument Download PDFInfo
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Abstract
The invention discloses a kind of dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument, including：Using Network Analyzer and network detection circuit, detection circuit parameter is adjusted；The phase place change passed through with setpoint frequency measurement electromagnetic wave before and after medium known to dielectric constant, obtains corresponding phase difference；Relation between fit phase difference and dielectric constant, opening relationships model；Detection signal frequency duplicate measurements is adjusted, phase difference and dielectric constant relational model are established repeatedly, until drawing optimum detection frequency and corresponding optimum detection relational model；With optimum detection frequency measurement electromagnetic wave by the phase place change before and after the unknown medium of dielectric constant, corresponding phase difference is obtained；The dielectric constant of the unknown medium of dielectric constant is calculated using optimum detection model.The method provided by the present invention is simple to operate, non-comprehensive Network Analyzer can be selected, cost is relatively low, easy to spread.
Description
Technical field
The present invention relates to the dielectric permittivity of dielectric constant measurement technology, more particularly to a kind of Excavation Cluster Based on Network Analysis instrument to survey
Amount method.
Background technology
In EM theory, the interaction of electromagnetic wave and medium and field change are mainly Jie by studying its medium
Electric constant is analyzed, because the complex dielectric permittivity of different material is essentially different, it characterizes medium and electromagnetic field
Between interaction, reacted medium electric field energy storage with loss size；It is different in research in physically researcher
Dielectric and its property go to study also with dielectric constant；In microwave remote sensing field, the dielectric constant of typical feature is that it grinds
Study carefully the key component of the atural object such as scattering properties of soil, vegetation, deep woods, seawater, ice and snow etc.；Because in microwave remote sensing study mechanism
Received terrestrial object information, a part reflect the geometric properties of target, and what remaining almost reflected is all the phase of dielectric constant
Close information.Therefore the terrestrial object information of correlation is expected, it is necessary to which the theory established between these terrestrial object informations and dielectric constant is public
Formula or empirical model, either in the research of active microwave remote sensing or in the research of passive microwave remote sensing, receive
The information of the dielectric constant of sample is contained inside microwave signal, is the function on sample dielectric constant.Changing
In terms of learning chemical industry, dielectric constant is an important parameter of reactive material characteristic.In the chemical reaction under microwave action, understand
The equivalent complex dielectric permittivity of various common agents, it can be further appreciated that to microwave absorption and the situation of reflection.In chemical work
In industry, the measurement of dielectric constant is even more to study important in inhibiting to Chemical Manufacture and substance characteristics.It is micro- in microwave technical field
Wave technology just quickly advances, and the demand for development microwave circuit of microwave technology is integrated, miniaturization, and this promotes microwave Jie
The development of material and device.Its principal performance of microwave dielectric material and device is normal by the dielectric measured under microwave
The medium parameters such as number, dielectric loss, temperature coefficient of permittivity characterize.The tissue of edible vegetable oil, composition, structure, state
Deng all there is close relationship with their dielectric property, research and understanding edible oil dielectric property can be preferably to edible oils
The qualities such as composition, tissue, state are analyzed and monitored, it is possibility to have effect ground carries out edible vegetable oil using dielectric property and added
Work, so in terms of edible vegetable oil Quality Detection, dielectric constant is also a critically important parameter.
In addition to being used widely in above-mentioned field, Measuring Dielectric Constant is also in many fields for needing moisture measurement technology
Play an important role, it is most typical such as Jie's electrical survey soil moisture.It was used for originally in dielectric physics medium dielectric constant microwave medium
Description dielectric material is polarized the physical quantity of degree in the electric field, but the result of study of soil physics shows that Dielectric Constant of NaCl Soil is normal
Number contains the abundant information of reflection soil quality and property in itself.Using statistical mathematics homing method it has been proved that no matter
What difference the constituent of upper earth and quality have, and the real component of soil moisture content and the earth mixtures complex dielectric permittivity of water one is always
In deterministic monotropic function relation, the importance of this conclusion is that it shows that the measure of soil moisture content can be by aqueous
The measure of soil dielectric constant and determine indirectly.
At present, the measuring method of dielectric permittivity mainly has following a few classes：Time domain reflectometry, transmission/bounce technique, more shapes
State method, more Thickness Methods, Resonant-cavity Method and free-space Method etc..For from measuring principle, two major classes can be divided into again：Network is joined
Number method resonant cavity method.Network parameter method is primarily referred to as sample i.e. sensor being considered as Single port or two-port network, and utilization is above-mentioned
Method measures it and characterizes the parameter of network characteristic, typically scattering parameter, complex reflection coefficient etc., extrapolates the dielectric of medium accordingly
Constant.Transmission line method based on transmission/reflection parameters in network parameter method because with measurement bandwidth, measuring method it is simple and
The features such as precision is high, applicable to coaxial and Wave guide system is widely used.This method is by Nicolson, Ross and Weir
Et al. in nineteen seventies propose, referred to as NRW transmission/bounce technique.In this method, detected materials sample is placed in sky
Reciprocal two port network is formed in gas transmission line (waveguide or coaxial line), passes through vector automation network analyzer (Vector
Network Analyzer, i.e. VNA) measure the transmission line two-port network scattering parameter, then by anti-in terms of scattering
Perform the relative dielectric constant of material.Although this method is with simple and with higher precision, while to waveguide and same shafting
The advantages that system is applicable, but this method still suffers from the problem of a lot.It is generally acknowledged that the selection of method for measuring complex dielectric constant is main
Size of the height of working frequency, dielectric constant values depending on sample, the size of loss and sample etc..Asked for these
Topic, on the basis of the above method, scholars are constantly studied, and various new method of measuring thus occur.For example, existing document
(such as：Tian Buning, microwave network analysis Recent Progress and its application study, Xian Electronics Science and Technology University, 2002；Tian Buning etc.,
The straightforward procedure of microwave circuit substrate complex dielectric permittivity nondestructive measurement, Xian Electronics Science and Technology University's journal, 2002,04:543-
546；Tian Buning etc., some problem of transmission/reflection method for measuring complex permittivity of materials, electric wave science journal, 2002,01:10-15；
Zhao Caijun etc., improved coaxial transmission/reflection method for measuring complex dielectric permittivity, Chinese journal of scientific instrument, 2011,03:695-700；Scape
Shen is intelligent etc., the electromagnetic parameter of the transmission based on coaxial line/reflection method for measuring RF Materials, aerospace journal, and 2005,05:630-
634) it is (or thick to the thickness resonance, ambiguity, sample length of the complex dielectric permittivity of transmission/reflection method for measuring linear material
Degree) and influence and solution method of errors in position measurement of the sample in measured material to measurement result studied；According to
The theory of transmission/reflection method for measuring microwave absorbing material electromagnetic parameter, have studied tested sample length and sample in coaxial line
Influence of the measurement error of middle position to microwave absorbing material measuring electromagnetic parameters result, and propose to reduce the scheme of error.
Nevertheless, there is instrument cost is high, system architecture of measurement apparatus to be answered for above-mentioned dielectric constant measurement method
It is miscellaneous and to measurement sample require it is higher the problems such as, it is difficult to a wide range of popularization and application.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of dielectric permittivity of Excavation Cluster Based on Network Analysis instrument
Measuring method, this method is using the dielectric constant of Network Analyzer measurement medium, and the instrument cost used is low, and measuring system is easy
Realize, be easy to promote on a large scale.
The present invention principle be：The spread speed of electromagnetic wave in media as well can be calculated by formula 1：
(formula 1)
In formula 1：C is spread speed (C=3 × 10 of electromagnetic wave in a vacuum8M/s), ε is the dielectric constant of medium.When
When the distance of propagation does not change, then the time and the square root of dielectric constant that electromagnetic wave is propagated in media as well are directly proportional, i.e.,
It is expressed as formula 2：
(formula 2)
In formula 2, k is constant.
Further, when the frequency of electromagnetic wave is certain, when the distance of propagation is constant, phase that electromagnetic wave is propagated in media as well
Difference and the relation of dielectric constant are formula 3：
(formula 3)
In formula 3,Phase difference is represented, ε represents dielectric constant, and 2 π fk are constant.
It follows that the function determined between phase difference and the dielectric constant of medium that electromagnetic wave is propagated in media as well be present
Relation, front and rear phase difference can be propagated in media as well by measuring electromagnetic wave and obtain dielectric constant.Especially by measurement signal
By the phase difference before and after medium, the relation of fitting dielectric constant and phase difference, to obtain between dielectric constant and phase difference
Functional relation.The frequency of test signal is between 10MHz-210MHz, the phase that can be obtained by testing more each frequency
Relational model coefficient correlation size between potential difference and dielectric constant, picks out optimal test frequency.Establish model selection Jie
Medium known to electric constant.According to the functional relation between dielectric constant and phase difference, you can it is normal to obtain dielectric by phase difference
Number.
Technical scheme provided by the invention is：
A kind of dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument, comprises the following steps：
1) using Network Analyzer and network detection circuit, detection circuit parameter is adjusted；
In embodiments of the present invention, the Network Analyzer is the Network Analyzer 250B test systems of S＆A companies of the U.S.；
The network detection circuit is pin network test circuit；The detection circuit parameter mainly includes detection signal frequency and is used for
Reduce the resistance of each resistance in the π network impedance match circuits of error.
The Network Analyzer 250B test systems include signal generator, frequency counter, attenuator, power distribution
Device, 30dB attenuators, extender/line balance device, phasometer and voltmeter；The signal generator of the 250B test systems produces
One signal, after attenuator is decayed, signal is divided into two path signal by power divider, all the way by 30dB attenuators
Reference signal is used as afterwards, and another way signal enters pin network test circuit after extender/line balance device；The pin network
Test circuit is made up of symmetrical double π types loops, including input attenuator, output pad and detection probe；The input declines
Subtract device and output pad is used for so that the impedance of pin network and the matches impedances of 250B test systems；The detection probe
Popped one's head in for parallel two-hand, the distance for upper two probe of popping one's head in immobilizes；Signal obtains test signal after pin network；With
Phasometer and the phase difference and amplitude fading of voltmeter difference measuring reference signals and test signal.
2) phase place change passed through with setpoint frequency measurement electromagnetic wave before and after medium known to dielectric constant, is obtained corresponding
Phase difference；
Medium known to the dielectric constant is a variety of.In embodiments of the present invention, medium known to the dielectric constant
For 15 kinds；These dielectric constants are evenly distributed on 1~80.
3) relation between fit phase difference and dielectric constant, opening relationships model；
The relational model of the phase difference and dielectric constant is above-mentioned formula 3.
4) detection signal frequency, repeat step 2 are adjusted) and 3), phase difference and dielectric constant relational model are established repeatedly, directly
To drawing optimum detection frequency and corresponding optimum detection relational model；
Detection signal frequency is specially to produce a test signal every 10MHz between 10MHz~210MHz；Step 4) institute
Optimum detection frequency is stated, above-mentioned each frequency is specially measured and passes through before and after medium known to set a variety of dielectric constants
Phase difference, dielectric constant square root and phase difference are subjected to linear fit, the relational model phase relation that more each frequency obtains
Number R size, frequency when choosing coefficient correlation maximum is optimum detection frequency；Obtained phase difference is detected under the detection frequency
The relational model obtained with dielectric constant square root progress linear fit, as the optimum detection relational model.
5) phase is obtained by the phase place change before and after the unknown medium of dielectric constant with optimum detection frequency measurement electromagnetic wave
The phase difference answered；
6) the optimum detection model obtained using step 4), the dielectric constant of the unknown medium of dielectric constant is calculated,
Complete detection.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention provides a kind of dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument, is measured by Network Analyzer
Phase difference configured transmission, dielectric constant is drawn by the phase difference measured, specifically included：Detected using Network Analyzer and network
Circuit, adjust detection circuit parameter；The phase passed through with setpoint frequency measurement electromagnetic wave before and after medium known to dielectric constant
Change, obtains corresponding phase difference；Relation between fit phase difference and dielectric constant, opening relationships model；Adjustment detection letter
Number frequency duplicate measurements, establishes phase difference and dielectric constant relational model repeatedly, until drawing optimum detection frequency and corresponding
Optimum detection relational model；Become with optimum detection frequency measurement electromagnetic wave by the phase before and after the unknown medium of dielectric constant
Change, obtain corresponding phase difference；The dielectric constant of the unknown medium of dielectric constant is calculated using optimum detection model；This hair
Bright offer method is simple to operate, and the Network Analyzer of non-comprehensive can be selected in used Network Analyzer, and cost is relatively low, easily
In popularization.
Brief description of the drawings
Fig. 1 is the FB(flow block) of the inventive method.
Fig. 2 is Network Analyzer and the circuit diagram of pin network test；
Wherein, Network Analyzer includes signal generator, frequency counter, attenuator, power divider, 30dB decay
Device, extender/line balance device, phasometer and voltmeter；The signal generator of Network Analyzer produces a signal, through overdamping
After device decay, signal is divided into two path signal by power divider, is used as reference signal after 30dB attenuators all the way, one
Road signal enters pin network after extender/line balance device；π networks are made up of symmetrical double π types loops, R1、R2And R3Structure
Into input attenuator, R4、R5And R6Form output pad；Measuring probe is connected with pin network, pops one's head in and parallel two pin can be selected
Formula is popped one's head in, and the distance for upper two probe of popping one's head in immobilizes.
Embodiment
Below in conjunction with the accompanying drawings, the present invention, the model of but do not limit the invention in any way are further described by embodiment
Enclose.
The present invention provides a kind of dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument, and this method utilizes network analysis
Instrument measures the dielectric constant of medium, and the instrument cost used is low, and measuring system is easily realized, is easy to promote on a large scale.
In the field of soil moisture measurement, dielectric constant is an effectively intermediate variable, passes through Measuring Dielectric Constant
Moisture contained in soil can very effectively be measured.Method using Network Analyzer measurement dielectric permittivity can be used for
Measurement to soil moisture, not only use TDR instrument (Time Domain well below existing method in cost
Reflectomtry, time-domain reflectomer) cost, and can effectively and rapidly measure soil moisture.
In recent years, food-safety problem was increasingly paid close attention to by masses.Edible vegetable oil is lived as the people
Necessity, its safety problem is particularly important.Because its dielectric constant of different types of vegetable oil is essentially different,
The species of oil can be detected by measuring the dielectric constant of 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, is used
The equipment of the dielectric permittivity measuring method of above-mentioned Excavation Cluster Based on Network Analysis instrument includes Network Analyzer, network detection circuit, is situated between
Medium module, optimum detection relational model module and the unknown medium detection computing module of dielectric constant known to electric constant；Medium
Dielectric constant measurement method comprises the following steps：
1) using Network Analyzer and network detection circuit, detection circuit parameter is adjusted；
Fig. 2 is Network Analyzer and the circuit diagram of pin network test.Wherein, Network Analyzer includes signal generator, frequency
Rate counter, attenuator, power divider, 30dB attenuators, extender/line balance device, phasometer and voltmeter；Network analysis
The signal generator of instrument produces a signal, and after attenuator is decayed, signal is divided into two path signal by power divider,
Reference signal is used as after 30dB attenuators all the way, signal enters pin network after extender/line balance device all the way；π nets
Network is made up of symmetrical double π types loops, R1、R2And R3Form input attenuator, R4、R5And R6Form output pad；Pin network
In be connected with measuring probe, parallel two-hand probe can be selected in probe, and the distance for upper two probe of popping one's head in immobilizes.
The detection circuit parameter adjusted is needed, mainly includes detection signal frequency and the π network impedances for reducing error
The resistance of each resistance in match circuit.
Due to pop one's head in characteristic impedance in a liquid and probe match circuit impedance closer to when, then actual measurement data
It is more identical with theoretical model.In order to obtain optimal impedance matching circuit, it is necessary to do the experiment of impedance matching.What this experiment was used
Probe parameter is respectively：R=0.014m；R=0.002m；Parallel wire formula transmission line equiva lent impedance calculation formula：Wherein, R is the distance between two probes；R is probe radius；ε is the dielectric constant of the affiliated medium of probe.
Using the calculation formula of the above, by can be calculated equiva lent impedance of the probe in various media, impedance has been obtained
The table of comparisons is as shown in table 1.
The probe equiva lent impedance table of comparisons of table 1
| Medium | Dielectric constant | Equiva lent impedance/Ω |
| N-octyl alcohol | 10.24 | 72.97 |
| Isobutanol | 16.81 | 55.5 |
| Isopropanol | 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 be tested respectively, see
Table 2, wherein R4、R5、R6And R2、R1、R3Correspondent equal.
The π lattice network resistance R of table 21、R2、R3The resistance table of comparisons
Test result indicates that resistance R1~R6 resistance value is respectively 53.6 Ω, 25.5 Ω, 976 Ω, 25.5 Ω, 53.6
Ω and 976 Ω；Or resistance R1~R6 resistance value is respectively 158 Ω, 14.3 Ω, 66.5 Ω, 14.3 Ω, 158 Ω and 66.5
Ω。
2) phase place change passed through with setpoint frequency measurement electromagnetic wave before and after medium known to dielectric constant, is obtained corresponding
Phase difference；
Medium known to the dielectric constant is a variety of.In embodiments of the present invention, medium known to the dielectric constant
For 15 kinds；These dielectric constants are evenly distributed on 1~80, as shown in table 3.
The dielectric constant (20 DEG C) of the tested media of table 3
| Sequence number | Medium | Dielectric constant |
| 1 | Air | 1 |
| 2 | N-octyl alcohol | 10.24 |
| 3 | Isobutanol | 16.81 |
| 4 | Isopropanol | 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 dielectric constant, opening relationships model；
The relation of phase difference and dielectric constant is formula 3：
(formula 3)
In formula 3,Phase difference is represented, ε represents dielectric constant, and 2 π fk are constant.
4) detection signal frequency, repeat step 2 are adjusted) and 3), the relational model of phase difference and dielectric constant is established repeatedly,
Until drawing optimum detection frequency and corresponding optimum detection relational model.
Detection signal frequency is specially to produce a test signal every 10MHz between 10MHz~210MHz；Step 4) institute
Optimum detection frequency is stated, above-mentioned each frequency is specially measured and passes through before and after medium known to set a variety of dielectric constants
Phase difference, dielectric constant square root and phase difference are subjected to linear fit, the relational model phase relation that more each frequency obtains
Number R size, frequency when choosing coefficient correlation maximum is optimum detection frequency；Obtained phase difference is detected under the detection frequency
The relational model obtained with dielectric constant square root progress linear fit, as the optimum detection relational model.Wherein, it is related
Coefficients R is obtained by formula 4：
(formula 4)
In formula 4, n is the test specimens points for regression analysis；xiIt is in the actual dielectric constant of i-th of sampling point；It is institute
There is the average value of sampling point dielectric constant；yiIt is Jie obtained according to regression equation by the phase difference calculating measured in i-th of sampling point
Electric constant；It is being averaged for all sampling point predicted values.Coefficient R reflects the correlation between regression equation and measurement data
Property, R value illustrates that the phase relation between regression equation and test data is better closer to 1.
5) phase is obtained by the phase place change before and after the unknown medium of dielectric constant with optimum detection frequency measurement electromagnetic wave
The phase difference answered；
6) the optimum detection model obtained using step 4), the dielectric constant of the unknown medium of dielectric constant is calculated,
Complete detection.
The present invention using S＆A companies of the U.S. produce Network Analyzer 250B test systems and pin network test circuit come
Measure phase place change of the electromagnetic wave after solution.Network Analyzer is 250B test systems, including signal generator, frequency meter
Number device, attenuator, power divider, 30dB attenuators, extender/line balance device, phasometer and voltmeter.250B test systems
Signal generator produce a signal, after attenuator is decayed, signal is divided into two path signal by power divider, one
Road is used as reference signal after 30dB attenuators, and signal enters pin network after extender/line balance device all the way.π networks
It is made up of symmetrical double π types loops, including input attenuator, output pad and detection probe；Wherein, R1、R2And R3Form defeated
Enter attenuator, R4、R5And R6Output pad is formed, their effect is to make the impedance and measuring instrument (250B tests of π networks
System) matches impedances, be connected with measuring probe in pin network, selection of popping one's head in is parallel two-hand probe, upper two spy of probe
The distance of pin immobilizes.Signal obtains test signal after pin network, is measured respectively with reference to letter with phasometer and voltmeter
Number and test signal phase difference and amplitude fading.
This method needs first that medium is demarcated known to dielectric constant before implementing, and the method for demarcation is：First with above-mentioned
Circuit measuring electromagnetic wave pass through medium known to dielectric constant before and after phase place change, then fit phase difference and dielectric constant
Between relation, the parameter of adjustment circuit, establish model repeatedly, it is optimal using what is obtained until drawing optimal test model
The model medium unknown to dielectric constant detects.This method is mainly used to measure the dielectric constant of soil and then obtains soil
Moisture, it may also be used for measure the dielectric constant of vegetable oil, the species of vegetable oil be identified.
Below exemplified by detecting the species of edible vegetable oil (peanut oil), introduce the present invention and a kind of Excavation Cluster Based on Network Analysis is provided
The dielectric permittivity measuring method specific embodiment of instrument：
What the present embodiment established model selection is 15 kinds of media known to dielectric constant, and its dielectric constant is evenly distributed on 1
Between~80.The frequency of test signal is selected between 10MHz-210MHz, the phase obtained by testing more each frequency
The size of the coefficient R of relational model between difference and dielectric constant, picks out optimal test frequency.
Firstly the need of the parameter of adjustment measurement, the main adjustment including frequency test signal and the π nets for reducing error
The adjustment of each resistance in network impedance matching circuit.
In the present embodiment, the specific method of adjustment of frequency test signal is：Using Network Analyzer frequency be 10MHz~
A test signal is produced every 10MHz between 210MHz, before measuring each frequency by medium known to 16 kinds of dielectric constants
Phase difference afterwards, dielectric constant square root and phase difference are subjected to linear fit, the relational model phase that more each frequency obtains
The size of relation number, frequency when choosing coefficient correlation maximum is test frequency.
The specific method of adjustment of each resistance of π network impedance match circuits：The characteristic impedance of probe in media as well is calculated first.
In theory, the characteristic impedance popped one's head in media as well and the impedance for match circuit of popping one's head in are closer, then actual measurement data and theory
Model is more identical.According to the characteristic impedance value being calculated, probe match circuit takes several groups of resistances close to characteristic impedance, can be with
By be calculated 6 resistance in match circuit for resistance, then 16 kinds of test mediums known to dielectric constant are entered again
Row experiment, compares the coefficient correlation for the model that each group obtains, takes the probe match circuit impedance obtained during coefficient correlation maximum.This
In embodiment, resistance R1~R6 resistance value is respectively 158 Ω, 14.3 Ω, 66.5 Ω, 14.3 Ω, 158 Ω and 66.5 Ω.
It is (including each in frequency test signal and π network impedance match circuits for reducing error above-mentioned parameter has been chosen
The resistance of individual resistance) after, the phase with the circuit measuring single-frequency signals after adjustment by 16 kinds of media known to dielectric constant
Potential difference, the square root of obtained phase difference and dielectric constant is subjected to linear fit, model formation isWhereinRepresent phase difference, εrDielectric constant is represented, m is constant, m=2 π fk；By the value that m can be obtained after linear fit.
Edible vegetable oil (peanut oil) is carried out by the dielectric permittivity measuring method of above-mentioned Excavation Cluster Based on Network Analysis instrument
Detection, for example, the peanut oil of three common brands of in the market can be chosen, as Shandong is colored, the peanut of golden dragonfish and imperial famous brand
Oil, in aforementioned manners phase difference of the measurement signal after three brand peanut oil, the functional relation obtained according to the above method
Formula, it can be deduced that the dielectric constant of peanut oil, you can obtain the scope of the dielectric constant of the qualified peanut oil of in the market.Work as needs
When detection judges whether certain peanut oil is qualified, the dielectric constant of peanut oil to be detected can be measured with this method, then will survey
The dielectric constant and the dielectric constant range of the qualified peanut oil obtained before obtained is compared, if in the dielectric of qualified peanut oil
In constant range, then it may determine that and show that the peanut oil is qualified, if not in the dielectric constant range of qualified peanut oil,
It may determine that and show that the peanut oil is doped with other materials, be not qualified peanut oil.
It should be noted that the purpose for publicizing and implementing example is that help further understands the present invention, but the skill of this area
Art personnel are appreciated that：Do not departing from the present invention and spirit and scope of the appended claims, various substitutions and modifications are all
It is possible.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is with claim
The scope that book defines is defined.
Claims (10)
1. a kind of dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument, comprises the following steps：
1) using Network Analyzer and network detection circuit, detection circuit parameter is adjusted；
2) phase place change passed through with the detection signal frequency measurement electromagnetic wave of setting before and after medium known to dielectric constant, is obtained
Corresponding phase difference；
3) fit procedure 2) relation between obtained phase difference and known dielectric constant, establish the pass of phase difference and dielectric constant
It is model；
4) detection signal frequency, repeat step 2 are adjusted)~3), phase difference and dielectric constant relational model are established repeatedly, until
Go out optimum detection frequency and corresponding optimum detection relational model；
5) obtained corresponding by the phase place change before and after the unknown medium of dielectric constant with optimum detection frequency measurement electromagnetic wave
Phase difference；
6) the optimum detection relational model obtained using step 4), the dielectric constant of the unknown medium of dielectric constant is calculated,
Complete detection.
2. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 1, it is characterized in that, step 1) is described
Network Analyzer is the Network Analyzer 250B test systems of S＆A companies of the U.S.；The network detection circuit is tested for pin network
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) is described
Detect the resistance of each resistance in pin network test circuit of the circuit parameter mainly including detection signal frequency and for reducing error
Value.
4. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 2, it is characterized in that, the network point
Analyzer 250B test systems include signal generator, frequency counter, attenuator, power divider, 30dB attenuators, extension
Device/line balance device, phasometer and voltmeter；The signal generator of the 250B test systems produces a signal, through overdamping
After device decay, signal is divided into two path signal by power divider, is used as reference signal after 30dB attenuators all the way, separately
Signal enters pin network test circuit after extender/line balance device all the way.
5. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 2, it is characterized in that, the π types net
Network test circuit is made up of symmetrical double π types loops, including input attenuator, output pad and detection probe；The input
Attenuator and output pad are used for impedance and the matches impedances of 250B test systems for causing pin network；The detection is visited
Head is popped one's head in for parallel two-hand, and the distance for upper two probe of popping one's head in immobilizes；Signal obtains test signal after pin network；
With phasometer and the phase difference and amplitude fading of voltmeter difference measuring reference signals and test signal.
6. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 1, it is characterized in that, step 2) is described
Medium known to dielectric constant is a variety of.
7. the dielectric permittivity measuring method of Excavation Cluster Based on Network Analysis instrument as claimed in claim 6, it is characterized in that, step 2) is described
Medium known to dielectric constant is 15 kinds of media that dielectric constant 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, it is characterized in that, step 3) is described
The relational model of phase difference and dielectric constant is
In formula 3,Represent phase difference；ε represents dielectric constant；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, the detection letter
Number frequency is specially to produce a test signal every 10MHz between 10MHz~210MHz.
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) institute
Optimum detection frequency is stated, specially measures the phase that each frequency is passed through before and after medium known to set a variety of dielectric constants
Difference, dielectric constant square root and phase difference are subjected to linear fit, the relational model coefficient correlation that more each frequency obtains
Size, frequency when choosing coefficient correlation maximum is optimum detection frequency；Obtained phase is detected under the optimum detection frequency
Difference and dielectric constant square root carry out the relational model that linear fit obtains, as the optimum detection relational model；The pass
It is that model coefficient R is obtained by formula 4：
In formula 4, n is the test specimens points for regression analysis；xiIt is in the actual dielectric constant of i-th of sampling point；It is all samples
The average value of point dielectric constant；yiIt is that the dielectric obtained according to regression equation by the phase difference calculating measured in i-th of sampling point is normal
Number；It is being averaged for all sampling point predicted values.
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