CN1255688C - High sensitivity liquid dielectric constant measuring probe - Google Patents
High sensitivity liquid dielectric constant measuring probe Download PDFInfo
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- CN1255688C CN1255688C CN 03135194 CN03135194A CN1255688C CN 1255688 C CN1255688 C CN 1255688C CN 03135194 CN03135194 CN 03135194 CN 03135194 A CN03135194 A CN 03135194A CN 1255688 C CN1255688 C CN 1255688C
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Abstract
The present invention relates to a high sensitivity probe for measuring the dielectric constant of liquid. The probe comprises a coaxial line type outer conductor (1), a coaxial line type inner conductor (2), and fillers (3) between the inner conductor and the outer conductor, wherein the coaxial line type outer conductor (1) is partially cut thin and connected with an outer tunable conductor (4); and the coaxial line type inner conductor (2) is partially hollowed. The hollowed part is scarfed or sheathed with an inner tunable conductor (5), both the lengths of the outer tunable conductor (4) and the inner tunable conductor (5) are adjustable, and a plurality of grooves are arranged in the outer tunable conductor(4).
Description
Technical field
The present invention relates to a kind of liquid effective dielectric constant measuring sonde, relating in particular to a kind of being used for water is the lean solution chemical reaction effective dielectric constant on-line measurement probe of solvent.
Background technology
Just report the experimental result of accelerating chemical reaction with microwave as far back as N.H.Williams in 1967, from that time, just be subjected to people's great attention with microwave quickening and control chemical reaction.Now microwave has been widely used in field such as petrochemical complex, food chemical industry, medication chemistry and has produced huge economic benefit.The interaction of research electromagnetic field and chemical reaction system has become the emerging cross discipline that development in recent years is got up, obtains domestic and international numerous scientific workers' great attention and broad research.
Because chemical reaction system is a nonequilibrium system, system's absorption of electromagnetic energy changes into temperature rise under the electromagnetic wave effect, temperature rise has changed reaction rate, the variation of reaction rate has accelerated that the material composition changes in the reactive system, thereby cause the EFFECTIVE MEDIUM parameter to change, influence absorption of electromagnetic wave and reflection conversely again, this be one non-equilibrium, nonlinear process.In research electromagnetic field and chemical reaction system interaction process, macroscopical effective dielectric constant of reactive system is a very crucial research contents.Strict is very difficult from nonequilibrium system derivation effective dielectric constant; Adopt experimental technique, can be by the reflection coefficient of on-line measurement course of reaction, and then the specific inductive capacity of acquisition reactive system.
P.54-61, " journal of Shandong university " 1997,032 (001) discloses a kind of terminal open circuit coaxial probe that is used for the mixed liquid medium measurement, but utilized resonance method liquid towards material and low hydrous matter to carry out the measurement of dielectric attribute.Though above-mentioned probe is a high sensitivity probe, when it is used to measure with water when being the lean solution chemical reaction system of solvent, the bubble of influence such as electrochemical action generation is attached on the measuring sonde.Because of the specific inductive capacity of water changes the variation of macroscopical effective dielectric constant of caused entire reaction system much larger than reactant, the existence of bubble will directly influence the accuracy of measurement result.Therefore, above-mentioned probe can not be got rid of the influence of bubble to measurement result.Secondly, above-mentioned probe can only be used for fixing the dielectric constant measurement of frequency.
The present invention has designed a kind of the new detector that can be used for the on-line measurement of liquid-phase chemical reaction effective dielectric constant, can get rid of bubble in measuring process, and has multifrequency point on-line measurement and high sensitivity characteristic.
Summary of the invention
The present invention system transforms and forms common coaxial cable.The filling material 3 that comprises 2 of coaxial outer conductor 1, coaxial inner conductor 2 and coaxial outer conductor 1, coaxial inner conductors, also comprise by the fluting 6 on tunable outer conductor 4, tunable inner wire 5 and the tunable outer conductor 4 and constitute hollow slotted coaxial line part, this hollow slotted coaxial line partly constitutes the coaxial resonator of terminal open circuit, and the length of resonator cavity is by regulating tunable outer conductor 4 and tunable inner wire 5 carries out tuning; Coaxial outer conductor 1 is by the part skiving, and this skiving part is connected with tunable outer conductor 4, coaxial inner conductor 2 part hollows, and this hollow part and 5 interlocking or the sockets of tunable inner wire have one or several grooves 6 on tunable outer conductor 4.
Description of drawings
Fig. 1: structural representation of the present invention;
Fig. 2: outside drawing of the present invention;
Fig. 3: A-A cross-sectional view of the present invention;
Fig. 4: the present invention is used for the different sweep measurement curve maps constantly of chemical reaction, and wherein, transverse axis is survey frequency (6Hz), and the longitudinal axis is the mould value (dB) of reflection coefficient
Fig. 5: the sweep measurement curve comparison diagram of probe in pure water when bubble and no bubble are arranged, among the figure, the mould value (dB) of reflection coefficient when solid line is represented to have bubble to exist, dotted line represents to get rid of the mould value (dB) of bubble back reflection coefficient.
Embodiment
Followingly the present invention is described in further detail with reference to accompanying drawing and in conjunction with an embodiment.
As depicted in figs. 1 and 2, probe comprises two parts: traditional coaxial cable and hollow slotted coaxial line.Wherein, traditional coaxial cable is made up of coaxial outer conductor 1, coaxial inner conductor 2, and the filling material 3 between coaxial outer conductor 1 and coaxial inner conductor 2 is a teflon; The hollow slotted coaxial line is made of jointly one or several flutings 6 on tunable outer conductor 4, tunable inner wire 5, the tunable outer conductor 4, fills measured medium between tunable inner wire 4, the tunable outer conductor 5.The hollow slotted coaxial line partly constitutes the coaxial resonator of terminal open circuit, its length Δ L by regulate tunable inner wire 4, tunable outer conductor 5 carries out tuning.Δ L changes in the scope of 2～30mm.In the present embodiment, realize being threaded by screw thread 7 between tunable outer conductor 4 and the coaxial outer conductor 1, be threaded by screw thread 8 realizations between tunable inner wire 5 and the coaxial inner conductor 2.
During measurement, probe inserts and to have the part air in the liquid and can't get rid of, and in the measuring process because influences such as electrochemical actions, can be at the inner bubble that produces of terminal open circuit coaxial resonator of this probe.Studies show that the existence meeting of bubble has an immense impact on to the accuracy of measuring, as shown in Figure 5.The present invention in time gets rid of bubble because of have some grooves on the outer conductor of terminal open circuit coaxial resonator when helping probe insertion liquid, must not stop to rock probe in measurement, in time discharges the bubble that produces owing to effects such as galvanochemistry.Be to offer 2 grooves shown in the present embodiment, but therefore do not get rid of asymmetric fluting in cavity extreme positions symmetry.The width of this groove should suit, and the too narrow eliminating that is unfavorable for bubble too widely then can make the reflection coefficient tuning curve not obvious owing to the leakage of too many energy.The groove width of selecting in the present embodiment is 1mm.
Because a lot of liquid, especially chemical reaction solution often have corrosivity.For avoiding probe in measurement, to be corroded, in the present embodiment whole probe has been carried out gold-plated processing.
The present invention has following outstanding substantive distinguishing features and significant progressive:
1. the realization of high sensitivity
This probe is very sensitive near resonance frequency.As shown in Figure 4, five moment in the liquid-phase chemical reaction process, because the continuous variation of reactant and product, the subtle change that causes the whole reaction system effective dielectric constant, thereby the subtle change of the reflection coefficient that causes, all available this probe detection goes out, and this to be traditional coaxial probe can't accomplish.
2. be used for the measurement of a plurality of frequencies
When Fig. 4 has provided cavity length Δ L and has been respectively 8mm and 6mm, the sweep measurement result of this probe.It can also be seen that from Fig. 4 cavity length difference, resonance frequency are also different.Therefore,, can change resonance frequency, follow the trail of the liquid dielectric of certain frequency by adjusting cavity length.This probe is made up of coaxial cable and hollow slotted coaxial line two parts, and hollow slotted coaxial line part is adjustable, thereby cavity length is adjustable, can accurately measure in 900MHz～3GHz scope.
3. accuracy height
Bubble is to shown in the accuracy influence very big (as Fig. 5) of measurement result.And bubble position difference also is different to the influence of measurement result, the existence of bubble, and the error that measurement result is produced has randomness, can't its influence be got rid of with the way of calibration.Traditional probe all can't be got rid of influence of air bubbles.But probe resonator cavity terminal of the present invention has groove, rocks probe and bubble can be discharged, thereby has avoided the harmful effect of bubble to measurement result.
4. anticorrosion
The present invention pops one's head in outside gold-plated, has prevented that chemical solution is to its corrosion of carrying out.
Claims (7)
1. liquid dielectric measuring sonde, comprise coaxial outer conductor (1), coaxial inner conductor (2) and be positioned at filling material (3) between coaxial outer conductor (1), the coaxial inner conductor (2), its feature also is to comprise by the fluting (6) on tunable outer conductor (4), tunable inner wire (5) and the tunable outer conductor (4) and constitutes hollow slotted coaxial line part, this hollow slotted coaxial line partly constitutes the coaxial resonator of terminal open circuit, and the length of this resonator cavity is undertaken tuning by regulating tunable outer conductor (4) and tunable inner wire (5); Coaxial outer conductor (1) is by the part skiving, and this skiving part is connected with tunable outer conductor (4), coaxial inner conductor (2) part hollow, this hollow space and tunable inner wire (5) interlocking or socket.
2. liquid dielectric measuring sonde as claimed in claim 1 is characterized in that having on the described tunable outer conductor (4) one or several grooves (6).
3. as claim 1 or the described liquid dielectric measuring sonde of claim 2, it is characterized in that between described tunable outer conductor (4) and coaxial outer conductor (1), being threaded the hollow part screw thread interlocking or the socket of tunable inner wire (5) and coaxial inner conductor (2).
4. as claim 1 or the described liquid dielectric measuring sonde of claim 2, it is characterized in that the fluting (6) on the described tunable outer conductor (4), be symmetrical distribution or asymmetric distribution in terminal open circuit coaxial resonator terminal.
5. as claim 1 or the described liquid dielectric measuring sonde of claim 2, it is characterized in that the width at the last fluting of described tunable outer conductor (4) (6) is 1mm.
6. liquid dielectric measuring sonde as claimed in claim 1 is characterized in that by tuning tunable outer conductor (4), tunable inner wire (5), and the adjustable variation range of length Δ L that makes described terminal open circuit coaxial resonator is in 2～30mm.
7. liquid dielectric measuring sonde as claimed in claim 1 is characterized in that whole probe is gold-plated probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135194 CN1255688C (en) | 2003-06-13 | 2003-06-13 | High sensitivity liquid dielectric constant measuring probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135194 CN1255688C (en) | 2003-06-13 | 2003-06-13 | High sensitivity liquid dielectric constant measuring probe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1482452A CN1482452A (en) | 2004-03-17 |
| CN1255688C true CN1255688C (en) | 2006-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03135194 Expired - Fee Related CN1255688C (en) | 2003-06-13 | 2003-06-13 | High sensitivity liquid dielectric constant measuring probe |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327233C (en) * | 2005-08-04 | 2007-07-18 | 上海交通大学 | Measuring circuit of electric rheological liquid high electric field strength dielectric constant |
| DE102010029007A1 (en) * | 2010-05-17 | 2011-11-17 | Robert Bosch Gmbh | Device for determining a composition of a fuel mixture |
| CN102435857A (en) * | 2011-09-09 | 2012-05-02 | 南京大学 | Reaction tank for representing broadband complex dielectric constant of liquid material |
| CN102508042B (en) * | 2011-10-19 | 2014-04-09 | 中国人民解放军第四军医大学 | Open-ended coaxial probe and method for measuring dielectric spectrum property of biological tissues |
| CN103278699B (en) * | 2013-05-20 | 2015-05-27 | 四川大学 | High-sensitivity open-ended coaxial probe |
| CN103308778B (en) * | 2013-07-03 | 2015-08-19 | 四川大学 | Dielectric constant measuring apparatus |
| CN103630555B (en) * | 2013-11-21 | 2016-03-23 | 烟台大学 | A kind of dangerous liquid material adopts the method for microwave multifrequency point vector detection in detecting |
| CN103743956B (en) * | 2014-01-08 | 2016-03-30 | 中电科技扬州宝军电子有限公司 | High-sensitivity liquid substance dielectric constant sensor |
| CN103884919B (en) * | 2014-03-13 | 2017-02-15 | 四川大学 | Medium dielectric coefficient measuring probe with coaxial line structure under high-temperature condition and system |
| CN106053956A (en) * | 2016-07-19 | 2016-10-26 | 电子科技大学 | Material dielectric constant testing system and testing method based on same |
| CN106772175A (en) * | 2016-11-30 | 2017-05-31 | 中国计量科学研究院 | A kind of simulated human tissue liquid dielectric constant measurement process calibration method |
| CN109239104A (en) * | 2018-08-31 | 2019-01-18 | 天津大学 | Dielectric constant measurement method based on broadband microwave resonant cavity sensor |
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2003
- 2003-06-13 CN CN 03135194 patent/CN1255688C/en not_active Expired - Fee Related
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| CN1482452A (en) | 2004-03-17 |
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