CN203688466U - Microwave fluid medium detector - Google Patents
Microwave fluid medium detector Download PDFInfo
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- CN203688466U CN203688466U CN201320853380.4U CN201320853380U CN203688466U CN 203688466 U CN203688466 U CN 203688466U CN 201320853380 U CN201320853380 U CN 201320853380U CN 203688466 U CN203688466 U CN 203688466U
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Abstract
The utility model discloses a microwave fluid medium detector. The microwave fluid medium detector is characterized by comprising a microwave transmission line, wherein the microwave transmission line comprises an open type microwave transmission line in the middle and closed type microwave transmission lines on the two sides; the open type microwave transmission line comprises a first inner conductor and a first outer conductor; each closed type microwave transmission line comprises a second inner conductor, a second outer conductor and a low-loss microwave medium filled in a sealing manner; the second inner conductors on the two sides are connected with the first inner conductor in the middle in an integral straight line manner; the second outer conductors on the two sides are integrally connected with the first outer conductor in the middle, and running water through holes are formed between the second outer conductors on the two sides and the first outer conductor in the middle; openings in the two ends of each running water through hole are connected with a pipeline for a fluid medium to be detected to flow through by means of flanges; the fluid flowing directions of the running water through holes are mutually vertical to the axial direction of the first inner conductor; a coaxial line opening formed by end parts of each second outer conductor and the corresponding second inner conductor is connected with a microwave adapter; the microwave adapter is connected with an external microwave measuring device. The microwave fluid medium detector has the advantages of simple structure and convenience in operation, and online continuous measurement for the fluid medium can be realized.
Description
Technical field
The utility model relates to a kind of microwave detector, especially relates to a kind of detector that can realize medium parameter measurement in radio frequency and microwave frequency band to the fluid in pipeline.
Background technology
At petrochemical industry, often need the content of the various components of fluid-mixing in measuring channel, and measuring method is utilized the difference of different component in some physical property often, while making the mixing ratio of component different can there is respective change in the parameter relevant to these physical propertys, know the blending ratio of component by inference by measuring this parameter, such as, in pipeline if the mixed flow of oil and water, in the ordinary course of things, the density of oil and water is variant, oil ratio water is light, when the blending ratio of profit is different, the density of oil-water mixture can change, so just can instead release the blending ratio of profit by measuring the density of oil-water mixture, in like manner, measure the physical parameter there are differences between other different component and also can realize the measurement of component ratio, difference is larger, the precision of measuring is higher.In electronic surveying field, the specific inductive capacity of medium is the essential parameter that affects the electroresponse performance of medium, the specific inductive capacity of different medium is generally not identical, therefore also can be by the derive variation of mixture ratio example of the variation of fluid-mixing specific inductive capacity, and can solve densitometer method in the time measuring the close material of two kinds of density, the problem that measuring accuracy is undesirable by measuring the specific inductive capacity of fluid-mixing.
The specific inductive capacity of existing fluid media (medium) adopts capacitive transducer to measure conventionally, and its method is between its two pole plates, to be first the capacitor C of test capacitors in air
0, then, by same capacitor plate spacing but record capacitor C after adding dielectric liquid between pole plate
x, the relative dielectric constant of liquid can calculate with following formula
ε r =C
x/ C
0.But specific inductive capacity generally changes along with the change of signal frequency, so will measure the frequency that the specific inductive capacity of fluid media (medium) also needs to determine measuring-signal, the absolute dielectric constant of medium is all smaller number, and the order of magnitude is 10
-12according to Maxwell system of equations, the higher variation to medium specific inductive capacity of frequency of signal is more responsive, most significant end at whole radio-frequency range microwave in band frequency, so microwave signal is the most responsive to the variation of medium specific inductive capacity, the variation that utilizes microwave signal to carry out measuring media specific inductive capacity can obtain the highest sensitivity certainly.The wavelength of microwave in free space is reduced to below one millimeter from one meter, the higher wavelength of frequency is shorter, because the wavelength of microwave and common lumped parameter components and parts are as resistance, the size comparability of electric capacity and inductance is intended, so lumped parameter components and parts are no longer the lumped-parameter element of conventional single type at microwave frequency band, there is distributed resistance but become, the complicated element of electric capacity and inductance, so above-mentioned electric capacity can also be used to realize the measurement of medium specific inductive capacity at low-frequency band, and it is just no longer applicable at microwave frequency band, because at this moment under the excitation of microwave signal, an electric capacity has been no longer simple electric capacity, but distributed resistance, the complex of electric capacity and inductance, so carrying out the variation of detection flows body medium specific inductive capacity, applied microwave must take new method.In microwave practical application, generally can utilize microwave transmission line or microwave cavity etc. to carry out the specific inductive capacity of measuring media, but the method is generally used for electronic applications all the time, at present, also not disclose both at home and abroad any about utilizing transmission line mechanism to carry out the device of on-line continuous measurement fluid specific inductive capacity.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of simple in structure, easy to operate, microwave fluid media (medium) detector that fluid medium can realize online continuous coverage.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of microwave fluid media (medium) detector, comprise microwave transmission line, described microwave transmission line comprises the closed microwave transmission line of the open microwave transmission line of interlude and both sides, described open microwave transmission line comprises the first inner wire and is sheathed on the first described inner wire periphery and first outer conductor coaxial with the first inner wire, described closed microwave transmission line comprises the second inner wire, be sheathed on the second described inner wire periphery and be filled in the low-loss microwave dielectric between the second described inner wire and described the second outer conductor with coaxial the second outer conductor of the second inner wire and sealing, the second inner wire described in both sides is connected with middle the first described inner wire one straight line, the second outer conductor described in both sides is connected with the first middle described outer conductor one and forms each other flowing water through hole, the pipeline that the both ends open of described flowing water through hole is flowed through with fluid media (medium) to be measured by flange is connected, in described flowing water through hole, flow through direction and described first inner wire of fluid is axially mutually vertical, the end of the end of the second described inner wire and the second described outer conductor forms coaxial cable port, described coaxial cable port is provided with the microwave adapter for off-gauge microwave coaxial line interface being converted to the microwave coaxial line interface of standard, described microwave adapter is connected with outside MMU microwave measurement unit, described fluid media (medium) to be measured flow through the first described inner wire and with described open microwave transmission line in microwave interactive.
The outer wall of the end of the second described outer conductor is provided with external thread, and described microwave adapter inside is provided with internal thread, and described external thread cooperatively interacts and is closely connected with described internal thread.By the screw thread mode that spins, the second outer conductor is compressed and is connected with microwave X-over, not only connect, separate simple, and ensure the reliability of electrical connection between the two, make the expansion that is squeezed of microwave-medium between the second outer conductor and the second inner wire simultaneously, further improved the second inner wire, low-loss microwave dielectric and the second outer conductor sealing property each other.
The xsect of the first described inner wire and the second described inner wire is circle, and the xsect of the first described outer conductor and the second described outer conductor is annular.Make one-piece construction simple, simplified processing process.
The first described inner wire is flat, the second described inner wire comprises the circle segments conductor and the flat part conductor that connect successively from outside to inside, the interior bone shape of the first described outer conductor is identical with the shape of the first described inner wire, the interior bone shape of the second described outer conductor is identical with the shape of the second described inner wire, the first described inner wire and the first described outer conductor form open banded line, described circle segments conductor, the described low-loss microwave dielectric being filled between circle segments conductor and the second outer conductor in the second outer conductor and the sealing of circle segments conductor periphery forms coaxial cable, described flat part conductor, the described low-loss microwave dielectric being filled between flat part conductor and the second outer conductor in the second outer conductor and the sealing of flat part conductor periphery forms closed strip line.Because the first inner wire is shaped as flat, reduce the resistance being subject to when fluid media (medium) is flowed through, improve work efficiency, and adopting the linking transition section of closed strip line as open banded line and coaxial cable, antiseep and the voltage endurance capability of whole device transmitted and ensured to the no reflection events that is conducive to microwave.
Described circle segments conductor adopts the little reducing round conductor in two broad in the middle.Adopt reducing coaxial configuration to strengthen detector anti-leak function, improved the withstand voltage properties of detector simultaneously.
Described reducing round conductor comprises the entrance that is positioned at described microwave adapter connecting successively, be positioned at the second described outer conductor port part expanding reach and be positioned at the section of dwindling of the second described outer conductor, between described entrance and described expanding reach, be provided with the entrance extension that diameter is identical with entrance, described entrance extension is positioned at the port part of the second described outer conductor, the section of the dwindling transition section in advance that between described expanding reach and the described section of dwindling, the section of being provided with and dwindling diameter is identical, the described section of dwindling in advance transition section is positioned at the port part of the second described outer conductor, between the described section of dwindling and described flat part conductor, be provided with the section of dwindling extension.By the each extension of above-mentioned coaxial cable and the setting of transition section in advance, while making microwave run into structural unevenness in transmitting procedure, produce two bundle reflection waves of 180 ° of identical, the phase phasic differences of amplitude and cancel out each other, thereby transmitted wave is strengthened mutually, made microwave energy no reflection events on transmission channel and transfer to the interphase of open transmission line and closed transmission line.
Described MMU microwave measurement unit is microwave vector network analyzer or the circuit with microwave vector network analysis function.
Principle: the specific inductive capacity of measuring fluid media (medium) according to the response in microwave transmission process.As shown in Figure 1, be axially microwave transmission line, centre has length to be
dthe medium of one section of filling and both sides different, the medium of supposing both sides is loss-free medium, middle medium is fluid media (medium), unlimited distance the fluid media (medium) of microwave signal in the middle of being transferred to time owing to running into unevenness, can before fluid media (medium), produce reflection wave, produce in the back transmitted wave, on transmission channel, do not occur the unevenness of geometry, at this moment unevenness is mainly because the sudden change of fluid media (medium) produces, reflection wave and transmitted wave are by the unique decision of difference of fluid media (medium) and loss-free medium, just can derive the medium parameter of fluid media (medium) by reflection wave and transmitted wave and the ratio of incident wave and the medium parameter of loss-free medium.
Compared with prior art, the utility model has the advantage of: the utility model discloses a kind of microwave fluid media (medium) detector first, comprise microwave transmission line, microwave transmission line comprises the closed microwave transmission line of the open microwave transmission line of interlude and both sides, microwave transmission line is the passage of microwave transmission, general microwave transmission line structurally seals mostly, cannot allow fluid enter in transmission line, only under the condition of the destruction transmission line structures such as punching, could allow fluid enter transmission line inside, but so not only destroy the geometry of transmission line, make transmission line occur the unevenness on geometry, and make transmission line produce microwave leakage.
In the utility model, ducted fluid flows through easily through flowing water through hole from open microwave transmission line, make the microwave interactive in fluid and this open transmission line of process, be that open transmission line is the part that crosses of fluid passage and microwave channel, microwave signal is owing to running into the unevenness of fluid media (medium), produce certain reflection wave and transmitted wave, adopt low-loss microwave dielectric to guarantee not have on transmission channel in the situation of lossy microwave, at this moment unevenness is mainly because the sudden change of fluid media (medium) produces, further just can derive the specific inductive capacity of fluid media (medium) by the Amplitude Ratio of reflection wave and transmitted wave and incident wave and the specific inductive capacity of phase differential and low-loss microwave dielectric, thereby realize the microwave measurement of fluid medium parameter.The guided wave structure formed measurement that realizes fluid media (medium) parameter of this detector utilization opening, microwave transmission line is combined with pipeline just can real-time online and continuous coverage pipeline in the medium parameter of fluid, have simple in structure, practical and conveniently, especially the electrical property measurement of fluid media (medium) in chemical field is had to very large using value.
Brief description of the drawings
Fig. 1 is the principle explanation schematic diagram of the utility model microwave fluid media (medium) detector;
Fig. 2 is the one-piece construction schematic diagram of the utility model microwave fluid media (medium) detector;
Fig. 3 is the structural representation of the utility model embodiment mono-microwave fluid media (medium) detector;
Fig. 4 is the left view of the utility model embodiment mono-microwave fluid media (medium) detector;
Fig. 5 is the structural representation of the utility model embodiment bis-microwave fluid media (medium) detectors;
Fig. 6 is the left view of the utility model embodiment bis-microwave fluid media (medium) detectors.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model.
Specific embodiment one
A kind of microwave fluid media (medium) detector, as Fig. 2, shown in Fig. 3 and Fig. 4, comprise microwave transmission line, microwave transmission line comprises the closed microwave transmission line 2 of the open microwave transmission line 1 of interlude and both sides, open microwave transmission line 1 comprises the first inner wire 3 and is sheathed on the first inner wire 3 peripheries and first outer conductor 4 coaxial with the first inner wire 3, closed microwave transmission line 2 comprises the second inner wire 5, be sheathed on the second inner wire 5 peripheries and be filled in the low-loss microwave dielectric 7 between the second inner wire 5 and the second outer conductor 6 with coaxial the second outer conductor 6 of the second inner wire 5 and sealing, both sides the second inner wire 5 is connected with middle the first inner wire 3 one straight lines, both sides the second outer conductor 6 is connected with middle the first outer conductor 4 one and forms each other flowing water through hole 8, the pipeline that the both ends open of flowing water through hole 8 is flowed through with fluid media (medium) to be measured by flange 9 is connected, fluid the axially mutually vertical of direction and the first inner wire 3 of flowing through in flowing water through hole 8, the end of the second inner wire 5 and the second outer conductor 6 ends form coaxial cable port 10, coaxial cable port 10 is provided with the microwave adapter 11 for off-gauge microwave coaxial line interface being converted to the microwave coaxial line interface of standard, microwave adapter 11 is connected with outside MMU microwave measurement unit, fluid media (medium) to be measured flow through the first inner wire 3 and the open transmission line 1 that forms with the first inner wire 3 and the first outer conductor 4 in microwave interactive.
In this specific embodiment, the outer wall of the end of the second outer conductor 6 is provided with external thread, and microwave adapter 11 inside are provided with internal thread (not shown), and external thread cooperatively interacts and is closely connected with internal thread.The xsect of the first inner wire 3 and the second inner wire 5 is circle, and the xsect of the first outer conductor 4 and the second outer conductor 6 is annular.Above-mentioned MMU microwave measurement unit is microwave vector network analyzer or the circuit with microwave vector network analysis function.Above-mentioned low-loss microwave dielectric 7 can adopt the materials such as pottery.
Specific embodiment two
A kind of microwave fluid media (medium) detector, as Fig. 2, shown in Fig. 5 and Fig. 6, comprise microwave transmission line, microwave transmission line comprises the closed microwave transmission line 2 of the open microwave transmission line 1 of interlude and both sides, open microwave transmission line 1 comprises the first inner wire 3 and is sheathed on the first inner wire 3 peripheries and first outer conductor 4 coaxial with the first inner wire 3, closed microwave transmission line 2 comprises the second inner wire 5, be sheathed on the second inner wire 5 peripheries and be filled in the low-loss microwave dielectric 7 between the second inner wire 5 and the second outer conductor 6 with coaxial the second outer conductor 6 of the second inner wire 5 and sealing, both sides the second inner wire 5 is connected with middle the first inner wire 3 one straight lines, both sides the second outer conductor 6 is connected with middle the first outer conductor 4 one and forms each other flowing water through hole 8, the pipeline that the both ends open of flowing water through hole 8 is flowed through with fluid media (medium) to be measured by flange 9 is connected, fluid the axially mutually vertical of direction and the first inner wire 3 of flowing through in flowing water through hole 8, the end of the second inner wire 5 and the second outer conductor 6 ends form coaxial cable port 10, coaxial cable port 10 is provided with the microwave adapter 11 for off-gauge microwave coaxial line interface being converted to the microwave coaxial line interface of standard, microwave adapter 11 is connected with outside MMU microwave measurement unit, fluid media (medium) to be measured flow through the first inner wire 3 and the open transmission line 1 that forms with the first inner wire 3 and the first outer conductor 4 in microwave interactive.
In this specific embodiment, the outer wall of the end of the second outer conductor 6 is provided with external thread, and microwave adapter 11 inside are provided with internal thread (not shown), and external thread cooperatively interacts and is closely connected with internal thread.
In this specific embodiment, the first inner wire 3 is flat (xsect is rectangle), the second inner wire 5 comprises that the circle segments conductor 12 and the flat part conductor 13(xsect that connect are successively rectangle from outside to inside, flat part conductor 13 is connected with the first inner wire 3), the interior bone shape of the first outer conductor 4 is identical with the shape of the first inner wire 3, the interior bone shape of the second outer conductor 6 is identical with the shape of the second inner wire 5, both form open banded line the first inner wire 3 and the first outer conductor 4, circle segments conductor 12, low-loss microwave dielectric 7 threes that are filled between circle segments conductor 12 and the second outer conductor 6 in the second outer conductor 6 and the sealing of circle segments conductor 12 peripheries form coaxial cable, flat part conductor 13, low-loss microwave dielectric 7 threes that are filled between flat part conductor 13 and the second outer conductor 6 in the second outer conductor 6 and the sealing of flat part conductor 13 peripheries form closed strip line, adopt the linking transition section of closed strip line as open banded line and coaxial cable.Circle segments conductor 12 adopts the little reducing round conductor in two broad in the middle.This reducing round conductor comprises the entrance that is positioned at microwave adapter 11 14 connecting successively, be positioned at the second outer conductor 6 port part expanding reach 15 and be positioned at the section of dwindling 16 of the second outer conductor 6, between entrance 14 and expanding reach 15, be provided with the port part that entrance extension 17 that diameter is identical with entrance 14 and entrance extension 17 are positioned at the second outer conductor 6, the section of dwindling that between expanding reach 15 and the section of dwindling 16, the section of being provided with and dwindling 16 diameters are identical in advance transition section 18 and the section of dwindling in advance transition section 18 be positioned at the port part of the second outer conductor 6, between flat part conductor 13 in the section of dwindling 16 and closed strip line, be provided with the section of dwindling extension 19.Above-mentioned MMU microwave measurement unit is microwave vector network analyzer or the circuit with microwave vector network analysis function.
Certainly, above-mentioned explanation is not limitation of the utility model, and the utility model is also not limited to above-mentioned giving an example.Those skilled in the art are in essential scope of the present utility model, and variation, remodeling, interpolation or the replacement made, also should belong to protection domain of the present utility model.
Claims (7)
1. a microwave fluid media (medium) detector, it is characterized in that: comprise microwave transmission line, described microwave transmission line comprises the closed microwave transmission line of the open microwave transmission line of interlude and both sides, described open microwave transmission line comprises the first inner wire and is sheathed on the first described inner wire periphery and first outer conductor coaxial with the first inner wire, described closed microwave transmission line comprises the second inner wire, be sheathed on the second described inner wire periphery and be filled in the low-loss microwave dielectric between the second described inner wire and described the second outer conductor with coaxial the second outer conductor of the second inner wire and sealing, the second inner wire described in both sides is connected with middle the first described inner wire one straight line, the second outer conductor described in both sides is connected with the first middle described outer conductor one and forms each other flowing water through hole, the pipeline that the both ends open of described flowing water through hole is flowed through with fluid media (medium) to be measured by flange is connected, in described flowing water through hole, flow through direction and described first inner wire of fluid is axially mutually vertical, the end of the end of the second described inner wire and the second described outer conductor forms coaxial cable port, described coaxial cable port is provided with the microwave adapter for off-gauge microwave coaxial line interface being converted to the microwave coaxial line interface of standard, described microwave adapter is connected with outside MMU microwave measurement unit, described fluid media (medium) to be measured flow through the first described inner wire and with described open microwave transmission line in microwave interactive.
2. a kind of microwave fluid media (medium) detector according to claim 1, it is characterized in that: the outer wall of the end of the second described outer conductor is provided with external thread, described microwave adapter inside is provided with internal thread, and described external thread cooperatively interacts and is closely connected with described internal thread.
3. a kind of microwave fluid media (medium) detector according to claim 2, it is characterized in that: the xsect of the first described inner wire and the second described inner wire is circle, the xsect of the first described outer conductor and the second described outer conductor is annular.
4. a kind of microwave fluid media (medium) detector according to claim 2, it is characterized in that: the first described inner wire is flat, the second described inner wire comprises the circle segments conductor and the flat part conductor that connect successively from outside to inside, the interior bone shape of the first described outer conductor is identical with the shape of the first described inner wire, the interior bone shape of the second described outer conductor is identical with the shape of the second described inner wire, the first described inner wire and the first described outer conductor form open banded line, described circle segments conductor, the described low-loss microwave dielectric being filled between circle segments conductor and the second outer conductor in the second outer conductor and the sealing of circle segments conductor periphery forms coaxial cable, described flat part conductor, the described low-loss microwave dielectric being filled between flat part conductor and the second outer conductor in the second outer conductor and the sealing of flat part conductor periphery forms closed strip line.
5. a kind of microwave fluid media (medium) detector according to claim 4, is characterized in that: described circle segments conductor adopts the little reducing round conductor in two broad in the middle.
6. a kind of microwave fluid media (medium) detector according to claim 5, it is characterized in that: described reducing round conductor comprises the entrance that is positioned at described microwave adapter connecting successively, be positioned at the second described outer conductor port part expanding reach and be positioned at the section of dwindling of the second described outer conductor, between described entrance and described expanding reach, be provided with the identical entrance extension of diameter and entrance, described entrance extension is positioned at the port part of the second described outer conductor, the section of the dwindling transition section in advance that between described expanding reach and the described section of dwindling, the section of being provided with and dwindling diameter is identical, the described section of dwindling in advance transition section is positioned at the port part of the second described outer conductor, between the described section of dwindling and described flat part conductor, be provided with the section of dwindling extension.
7. according to a kind of microwave fluid media (medium) detector described in any one in claim 1-6, it is characterized in that: described MMU microwave measurement unit is microwave vector network analyzer or the circuit with microwave vector network analysis function.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320853380.4U CN203688466U (en) | 2013-12-23 | 2013-12-23 | Microwave fluid medium detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320853380.4U CN203688466U (en) | 2013-12-23 | 2013-12-23 | Microwave fluid medium detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728320A (en) * | 2013-12-23 | 2014-04-16 | 宁波威瑞泰默赛多相流仪器设备有限公司 | Microwave fluid medium detector |
| CN107655902A (en) * | 2017-08-25 | 2018-02-02 | 天津大学 | A kind of circular microwave resonant cavity sensor solution concentration measuring method |
-
2013
- 2013-12-23 CN CN201320853380.4U patent/CN203688466U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728320A (en) * | 2013-12-23 | 2014-04-16 | 宁波威瑞泰默赛多相流仪器设备有限公司 | Microwave fluid medium detector |
| CN103728320B (en) * | 2013-12-23 | 2015-12-02 | 宁波威瑞泰默赛多相流仪器设备有限公司 | A kind of microwave fluid medium detector |
| CN107655902A (en) * | 2017-08-25 | 2018-02-02 | 天津大学 | A kind of circular microwave resonant cavity sensor solution concentration measuring method |
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Granted publication date: 20140702 Effective date of abandoning: 20151202 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |