CN105954595A - Blade dielectric constant measuring apparatus and method - Google Patents
Blade dielectric constant measuring apparatus and method Download PDFInfo
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- CN105954595A CN105954595A CN201610247800.2A CN201610247800A CN105954595A CN 105954595 A CN105954595 A CN 105954595A CN 201610247800 A CN201610247800 A CN 201610247800A CN 105954595 A CN105954595 A CN 105954595A
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- sample
- vacuum
- seal bag
- probe
- temperature probe
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R27/2617—Measuring dielectric properties, e.g. constants
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention provides a blade dielectric constant measuring apparatus and method. The blade dielectric constant measuring apparatus comprises a bracket, which is provided with a clamp thereon. A high temperature probe is fixed on the clamp via a nut. An adapter at the upper end of the high temperature probe is connected to a Port1 port of a vector network analyzer via a coaxial line. A lifting platform is arranged at one side of the bracket. A vacuum packing machine is arranged on the lifting platform. A vacuum sealing bag is connected with the vacuum packing machine. The measuring method comprises sample preparation, system installation, instrument calibration, sample placement and evacuation operation, and dielectric constant measurement. The invention has the advantages that good and close contact of a sample and the probe is guaranteed and the measurement accuracy is high.
Description
Technical field
The present invention relates to blade dielectric constant measuring apparatus technical field, particularly relate to a kind of blade dielectric constant and survey
Amount device and measuring method.
Background technology
In nature, most of materials are all rendered as lossy insulator, referred to as electrolyte in microwave band,
It is called for short medium.The complex dielectric permittivity real part of medium represents the electrolyte storage capacity to electromagnetic wave, and imaginary part reflects
The medium loss to electromagnetic wave.Complex dielectric permittivity reflect on macroeconomic significance medium to the radiation of electromagnetic wave, dissipate
Penetrate and the characteristic such as absorption, microcosmic meaning reflects material internal structure and characteristic.It can be said that in electromagnetism field,
The difference of medium can be embodied by complex dielectric permittivity.The precision of blade dielectric constant directly influences microwave vegetation spoke
Penetrate the simulation precision with scattering model.Blade Study on dielectric property is the weight that microwave remote sensing carries out vegetation parameter inverting
Want ingredient.
Laboratory measurement blade dielectric constant is mainly based upon microwave network analyzer, generally use waveguide method, from
Measured by methods such as space law, coaxial probe methods.Compared to other measuring methods, coaxial probe method is permissible
Carry out wide-band measurement.But coaxial probe method requires that sample is sufficiently thick, i.e. its length and loss tangent is enough
Greatly, electromagnetic wave is complete through the transmission attenuation of sample, it is assumed that sample is uniform, then measured sample office
Portion's complex dielectric permittivity is the complex dielectric permittivity that sample area is overall.Owing to individual vane thickness is usually grade,
Therefore generally blade is overlapped when measuring.Coaxial probe method also requires must seamless to connect between probe and sample
Touch, if contact layer has air, measurement result can be produced impact, it is therefore necessary to by air layer therebetween
Get rid of.The method generally used is simply to be compacted by blade, and this method dynamics is difficult to control to, pressure mistake
Greatly, the structure on meeting damaged blade surface, pressure is too small, it is impossible to get rid of the space of blade interlayer.Additionally, to spy
Head is difficult to avoid that coaxial line deforms upon while applying pressure, thus introduces certain error.These all can increase
Add the uncertainty of measurement result.And, accurate pressure measxurement also can increase the complexity of system.
Summary of the invention
For solving above-mentioned technical problem, the invention provides a kind of blade dielectric constant measuring apparatus and measuring method,
By introducing vacuum packing machine and vacuum seal bag, sample is carried out vacuum pumping, vacuum can be got rid of and seal
Air in Dai, it is ensured that sample structure is harmless and good with probe to be in close contact, and accuracy of measurement is high.
The embodiment of the present application provides a kind of blade dielectric constant measuring apparatus, including support, on described support
Being provided with fixture, high-temperature probe is fixed on fixture by nut, and the adaptor of high-temperature probe upper end passes through coaxial line
Being connected with the Port1 port of vector network analyzer, described support is provided with hoistable platform, on hoistable platform
Being provided with vacuum packing machine, vacuum packing machine connects vacuum seal bag.
A kind of blade dielectric constant measurement method of the present invention, uses the method for evacuation to discharge sample interlayer
And the air between sample and probe, comprise the following steps:
S1: prepared by sample
S11, blade surface dedusting；
Sample is cut by the metallic cylinder of S12, employing diameter 38mm or 29mm specification, roundleaf sheet
Diameter be greater than probe diameter size；
S13, by multiple roundleaf sheet superpositions of step S12, so that electromagnetic wave is complete through the transmission attenuation of sample
Finish；
S2: system is installed
S21, employing card punch are to vacuum seal bag punching to be sealed, and a diameter of 3.5mm in hole, with just
Make adaptor pass to be preferred；
S22, by high-temperature probe from inside to outside by hole insert vacuum seal bag, sound end in bag, adaptor
Stretch out vacuum seal bag；
S23, being fixed on fixture by high-temperature probe, fastening nut, sound end and vacuum seal bag are at fixture
Lower section, adaptor is above fixture, and coaxial line one end is connected with adaptor, the other end and Network Analyzer
Port 1 is connected.
S3: instrument calibration
Utilize air, short-circuiting device and distilled water that probe is calibrated, probe before calibration, should be set in software
The parameters such as type, frequency, water temperature；Vacuum seal bag need to be mentioned during calibration, make probe hide without vacuum seal bag
Gear, is completely exposed in atmosphere, and when calibrating with distilled water, detecting head surface can not have bubble；
S4: sample is placed and vacuum pumping
S41, sample is piled up neatly, put into vacuum seal bag, be placed in the underface of high-temperature probe, will be true
Empty package machine is placed on hoistable platform, adjusts the height of vacuum packing machine so that it is be in same with high-temperature probe
Highly；
S42, startup vacuum packing machine, extract air in vacuum seal bag out, make high-temperature probe and sample, sample
Interlayer be in close contact, when in vacuum seal bag vacuum reach specified vacuum spend time, vacuum packing machine is close to vacuum
Envelope seals.
S5: dielectric constant measurement
Use vector network analyzer that sample is observed, be repeated 3 times measurement, average to reduce measurement
Error.
The one or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that or advantage:
1, in the present invention, owing in sample sack, air content only relies upon vacuum packing machine performance, by selecting
High performance vacuum packing machine, in can making bag, vacuum reaches 80kpa, i.e. the outer atmospheric pressure of pressure relatively bag in bag
Strong low 80kpa, can either ensure the contact that probe and sample are the best, turn avoid external force to sample structure
Destruction, thus improve stability and the reliability of measurement result.
2, the method does not directly act on the external force of probe, therefore, decreases because coaxial line deformation brings
Error.
3, the method is simple, and the links in measurement can obtain good control, it is easy to implement.
4, the method can be used for the measurement of dielectric constant of the flexible laminar sample to similar blade.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, in describing below
Accompanying drawing is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying creativeness
On the premise of laborious, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the overall structure schematic diagram of the present invention.
In figure, 1, support, 2, fixture, 3, high-temperature probe, 4, nut, 5, adaptor, 6, coaxial line,
7, vector network analyzer, 8, Port1 port, 9, hoistable platform, 10, vacuum packing machine, 11, true
Empty sealing bag.
Detailed description of the invention
The invention provides a kind of blade dielectric constant measuring apparatus and measuring method, it can be ensured that sample and probe
Good close contact, accuracy of measurement is high.
In order to be better understood from technique scheme, below in conjunction with Figure of description and specific embodiment
Technique scheme is described in detail.
As it is shown in figure 1, a kind of blade dielectric constant measuring apparatus described in the present embodiment, including support 1, institute
The support 1 stated is provided with fixture 2, and high-temperature probe 3 is fixed on fixture 2 by nut 4, high-temperature probe 3
The adaptor 5 of upper end is connected with the Port1 port 8 of vector network analyzer 7 by coaxial line 6, described
Support 1 side is provided with hoistable platform 9, and hoistable platform 9 is provided with vacuum packing machine 10, vacuum packing machine 10
Connect and have vacuum seal bag 11.
A kind of blade dielectric constant measurement method described in the present embodiment, comprises the following steps:
S1: prepared by sample
S11, blade surface dedusting；
Sample is cut by the metallic cylinder of S12, employing diameter 38mm or 29mm specification, roundleaf sheet
Diameter be greater than probe diameter size；
S13, by multiple roundleaf sheet superpositions of step S12, so that electromagnetic wave is complete through the transmission attenuation of sample
Finish；
S2: system is installed
Vacuum seal bag 11 to be sealed is punched by S21, employing card punch, a diameter of 3.5mm in hole, with
Just make adaptor 5 through being preferred；
S22, by high-temperature probe 3 from inside to outside by hole insert vacuum seal bag 11, sound end in bag, turn
Joint 5 stretches out vacuum seal bag 11；
S23, high-temperature probe 3 is fixed on fixture 2, fastening nut 4, sound end and vacuum seal bag 11
In the lower section of fixture 2, adaptor 5 is above fixture 2, and coaxial line 6 one end is connected with adaptor 5, separately
One end is connected with Port 1 port 8 of vector network analyzer 7.
S3: instrument calibration
Utilize air, short-circuiting device and distilled water that high-temperature probe 3 is calibrated, should arrange in software before calibration
The parameters such as good probe type, frequency, water temperature；Vacuum seal bag 11 need to be mentioned during calibration, make high-temperature probe
3 block without vacuum seal bag 11, are completely exposed in atmosphere, and when calibrating with distilled water, high temperature is visited
Can not there be bubble on 3 surfaces；
S4: sample is placed and vacuum pumping
S41, sample is piled up neatly, puts into vacuum seal bag 11, be placed in the underface of high-temperature probe 3,
Vacuum packing machine 10 is placed on hoistable platform 9, adjusts the height of vacuum packing machine 10 so that it is with high temperature
Probe 3 is in sustained height；
S42, startup vacuum packing machine 10, extract air in vacuum seal bag 11 out, make high-temperature probe 3 and sample
Product, sample interlayer be in close contact, when in vacuum seal bag 11 vacuum reach specified vacuum spend time, vacuum packet
Vacuum seal bag 11 is sealed by installation 10.
S5: dielectric constant measurement
Use vector network analyzer 7 that sample is observed, be repeated 3 times measurement, average to reduce survey
Amount error.
Subsequent step is:
1) after measuring, with shears, vacuum seal bag one end is cut off, takes out sample, weigh sample quality,
Compared with surveying front quality, to guarantee that in measuring, water content does not has significant change.
2) dismounting is popped one's head in or prepares measurement of next group sample.
3) this group sample is dried, weigh sample dry weight.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any pro forma limit
System, although the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any familiar
Professional and technical personnel, in the range of without departing from technical solution of the present invention, when the technology of available the disclosure above
Content is made a little change or is modified to the Equivalent embodiments of equivalent variations, as long as being without departing from the technology of the present invention side
The content of case, any simple modification above example made according to the technical spirit of the present invention, equivalent variations
With modification, all still fall within the range of technical solution of the present invention.
Claims (2)
1. a blade dielectric constant measuring apparatus, it is characterised in that: include support (1), described support
(1) being provided with fixture (2), high-temperature probe (3) is fixed on fixture (2) by nut (4), high temperature
The adaptor (5) of probe (3) upper end Port1 by coaxial line (6) with vector network analyzer (7)
Port (8) connects, and described support (1) is provided with hoistable platform (9), and hoistable platform (9) is provided with
Vacuum packing machine (10), vacuum packing machine (10) connects vacuum seal bag (11).
2. a blade dielectric constant measurement method, it is characterised in that use the method for evacuation to discharge sample
Air between interlayer and sample and probe, comprises the following steps:
S1: prepared by sample
S11, blade surface dedusting；
Sample is cut by the metallic cylinder of S12, employing diameter 38mm or 29mm specification, roundleaf sheet
Diameter be greater than probe diameter size；
S13, by multiple roundleaf sheet superpositions of step S12, so that electromagnetic wave is complete through the transmission attenuation of sample
Finish；
S2: system is installed
Vacuum seal bag (11) to be sealed is punched by S21, employing card punch, a diameter of 3.5mm in hole,
Just to make adaptor (5) through being preferred；
S22, by high-temperature probe (3) from inside to outside by hole insert vacuum seal bag (11), sound end is at bag
In, adaptor (5) stretches out vacuum seal bag (11)；
S23, high-temperature probe (3) is fixed on fixture (2), fastening nut (4), sound end and vacuum
Seal bag (11) in the lower section of fixture (2), adaptor (5) in the top of fixture (2), coaxial line (6)
One end is connected with adaptor (5), Port 1 port (8) phase of the other end and vector network analyzer (7)
Even.
S3: instrument calibration
Utilize air, short-circuiting device and distilled water that high-temperature probe (3) is calibrated, should be in software before calibration
Set the parameters such as probe type, frequency, water temperature；Vacuum seal bag 11 need to be mentioned during calibration, make high temperature
Probe (3) blocks without vacuum seal bag (11), is completely exposed in atmosphere, is calibrating with distilled water
Time, can not there be bubble on high-temperature probe (3) surface；
S4: sample is placed and vacuum pumping
S41, sample is piled up neatly, put into vacuum seal bag (11), be placed in high-temperature probe (3)
Underface, is placed on vacuum packing machine (10) on hoistable platform (9), adjusts vacuum packing machine (10)
Height so that it is be in sustained height with high-temperature probe (3)；
S42, startup vacuum packing machine (10), extract vacuum seal bag (11) interior air out, make high-temperature probe (3)
With sample, sample interlayer be in close contact, when in vacuum seal bag (11) vacuum reach specified vacuum spend time,
Vacuum seal bag (11) is sealed by vacuum packing machine (10).
S5: dielectric constant measurement
Use vector network analyzer (7) that sample is observed, be repeated 3 times measurement, average to subtract
Little measurement error.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610247800.2A CN105954595B (en) | 2016-04-20 | 2016-04-20 | Blade dielectric constant measuring device and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610247800.2A CN105954595B (en) | 2016-04-20 | 2016-04-20 | Blade dielectric constant measuring device and measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105954595A true CN105954595A (en) | 2016-09-21 |
| CN105954595B CN105954595B (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610247800.2A Expired - Fee Related CN105954595B (en) | 2016-04-20 | 2016-04-20 | Blade dielectric constant measuring device and measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633273A (en) * | 2018-11-30 | 2019-04-16 | 上海无线电设备研究所 | One kind being used for open-cell load impedance test macro and its method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633273A (en) * | 2018-11-30 | 2019-04-16 | 上海无线电设备研究所 | One kind being used for open-cell load impedance test macro and its method |
| CN109633273B (en) * | 2018-11-30 | 2021-06-04 | 上海无线电设备研究所 | Open-hole load impedance test system and method |
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| CN105954595B (en) | 2020-07-03 |
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