CN105241522A - Tm01 mode converter - Google Patents
Tm01 mode converter Download PDFInfo
- Publication number
- CN105241522A CN105241522A CN201410320753.0A CN201410320753A CN105241522A CN 105241522 A CN105241522 A CN 105241522A CN 201410320753 A CN201410320753 A CN 201410320753A CN 105241522 A CN105241522 A CN 105241522A
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- Prior art keywords
- center conductor
- housing
- mode converter
- dielectric
- power supply
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention provides a TM01 mode converter, which is applied to make the physical strength high enough under the case of mounting a radar type measuring apparatus. The TM01 mode converter comprises a center conductor body (50) combined with a lead at a state that the lead (70) hangs, a patch antenna (41) mounted on the center conductor body, a power supply part (36) coupled with the patch antenna through an electrostatic capacitor, a shell body (24) that covers the patch antenna and the power supply part, and a dielectric medium (60) that is combined together with the center conductor body and the shell body to form a chamber (80), wherein the patch antenna is sealed inside the chamber; the center conductor body is provided with a short pin (52) that is connected to the shell body as a whole; and the formed load applied to the lead of the center conductor body is applied to the structure of the shell body through the short pin. The power supply part is provided by penetrating through the shell body and the high frequency signals supplied to the power supply part are converted into TM01 mode electromagnetic waves through the patch antenna.
Description
Technical field
The present invention relates to single line as transfer path carrys out the TM01 mode converter that uses in the device of transmitting high-frequency signal.TM01 mode converter can be used as such as to apply the converter that time shaft reflection coefficient measures the pulsed radar mode liquid level emasuring device of (TimeDomainReflectometry:TDR) technology.
Background technology
As one of radar mode that level gauging uses, there is pulsed radar mode.The principle of pulsed radar mode is described with reference to Fig. 6.As shown in Figure 6, if from the reference point of the roof of fluid box etc. towards the moment of the bottom radiation pulses of fluid box be t0, if the moment receiving the pulse returned in liquid level reflection is t1.If know the moment t0 of radiation pulses and receive the moment t1 of the pulse returned in liquid level reflection, just can measure the time (t1-t0) required for burst transmissions, the distance of the reflection spot from said reference position to electric wave can be obtained.That is, when setting the transmission speed of pulse as v, can be obtained by formula L=v × (t1-t0)/2 from reference point to the distance L of reflecting surface.
In pulsed radar mode liquid level gauge, sometimes make single line extend along pedal line in fluid box, make pulse transmit paired pulses in this single line and measure.In this case, single line transfer path converter is used.
Fig. 7 represents the summary of the pulsed radar mode liquid level gauge using single line transfer path converter.In the figure 7, crude oil, liquefied gas, other liquid 2 is accommodated with in the fluid box 1 that oil tanker etc. possess.The converter 3 of single line transfer path is installed at the roof 11 of fluid box 1.Line (metal wire) (wire) 5 extends from liquid level gauge 3 to the bottom 12 of fluid box 1 along pedal line.Line 5 is being stretched under straight state, and the lower end of line 5 is fixed in the bottom surface of fluid box 1.A part for line 5 is submerged in liquid 2.
Line 5 has supply terminals 4, and supply terminals 4 is applied in the load of the deadweight based on line 5.In addition, in oil tanker, owing to waiting hull to shake under sail, the liquid 2 in fluid box is moved, and in this case, line 5 is applied in rolling dynamic loading (sloshingload), so larger load concentration puts on supply terminals 4.So, in single wire transmission converter, need to guarantee fully high resistance to load performance for above-mentioned load.
In this manual, " converter " is the meaning equal with antenna.Above-mentioned converter 3 is following structure: the supply lines from not shown high-frequency pulse signal source is connected with line 5 at supply terminals 4, from the pulse of supply terminals 4 pairs of line 5 supply high frequencies.Above-mentioned converter 3 is the structure encouraged TM01 pattern, transmission from the high-frequency impulse online 5 that this converter is energized under TM01 pattern.
As the technology relevant with the present invention, there is the circular loop antenna (such as with reference to the 176th page of non-patent literature 1) encouraged TM01 pattern.In addition, also there will be a known TM01 pattern annulus paster antenna (patchantenna) (such as with reference to the 228th page of non-patent literature 2) using short pin (shortpin).
Prior art document
Technical literature
Non-patent literature 1: " understanding the book of antenna " (オ ー system society development capable " ア Application テ Na Ga わ か Ru originally ") of rear rattan work, the distribution of Ao Mu society still for a long time
Non-patent literature 2: rear rattan is shown still for a long time, electric wave news agency issues " lecture of antenna engineering introduction " (Electricity ripple new Wen She development capable " ア Application テ Na engineering Ru Door Talk seat ")
Summary of the invention
The technical matters solved is wanted in invention
The object of the present invention is to provide a kind of TM01 mode converter, rolling dynamic loading in its deadweight relative to line, fluid box can guarantee fully high physical strength, and can improve measuring accuracy when the converter as pulsed radar mode liquid level emasuring device uses.
For the technical scheme of technical solution problem
The principal character of the TM01 mode converter that the present invention relates to is, comprising:
For the center conductor be combined with this wire under the state making wire hang down;
Be installed on the paster antenna of above-mentioned center conductor;
By the power supply that electrostatic capacitance is coupled with above-mentioned paster antenna;
Cover the housing of above-mentioned paster antenna and above-mentioned power supply; With,
The dielectric of chamber is formed together with housing with above-mentioned center conductor,
Above-mentioned paster antenna is enclosed in above-mentioned chamber,
Above-mentioned center conductor has the short pin be combined as a whole with above-mentioned housing, thus the load becoming the above-mentioned wire putting on above-mentioned center conductor puts on the structure of above-mentioned housing via above-mentioned short pin,
Be provided with through above-mentioned housing and to the supply lines of above-mentioned power supply supply high frequency pulse and coaxial connector,
The high-frequency pulse signal come from above-mentioned coaxial connector supply is converted to the high-frequency pulse signal of TM01 pattern by above-mentioned paster antenna.
Invention effect
When making center conductor be combined with wire and hang down, the load applying of wire is in short pin, the housing of center conductor, and load does not put on dielectric and power supply.Even if the shake etc. due to wire makes the load change of the wire bonds putting on center conductor, pressure does not also put on dielectric.So, when the TM01 mode converter that will the present invention relates to is used as the converter based on the pulsed radar formula measurement mechanism of single wire transmission, measure with stable precision while the impact of load can not be subject to.
Accompanying drawing explanation
Fig. 1 is the longitudinal section of the embodiment representing the TM01 mode converter that the present invention relates to.
Fig. 2 is the cut-open view along the A-A line in Fig. 1.
Fig. 3 is the stereographic map of the center conductor represented in above-described embodiment.
Fig. 4 is the amplification plan view of the part of the short pin of above-mentioned center conductor.
Fig. 5 is the longitudinal section of the use-pattern representing above-described embodiment.
Fig. 6 is the oscillogram of the measuring principle for illustration of pulsed radar formula measurement mechanism.
Fig. 7 is the illustraton of model of the example representing the liquid level gauge using existing TM01 mode converter.
Embodiment
Below, be described with reference to the embodiment of accompanying drawing to the TM01 mode converter that the present invention relates to.
[embodiment]
In Fig. 1, Fig. 2, TM01 mode converter 20 has housing 24, paster antenna 41, short pin 52, center conductor 50, dielectric 60, power supply 36, coaxial connector 30, wire 70 as main component parts.
Be formed with flange 26 in the Ji Tu1Zhong lower end, open end of housing 24, this flange 26 and the fastening link of substrate 22, make flange 26 and substrate 22 be combined as a whole under the state fitted tightly.
Be formed with end difference in the inner circumferential side of housing 24 by being expanded by the internal diameter of the open side of housing 24, the space produced between this end difference and the upper surface of substrate 22 is clamped with the edge, periphery of dielectric 60.Dielectric 60 is arranged to prevent in the liquid immersion in fluid box to chamber 80.Dielectric 60 is set to, for the circular parts formed by the material possessing dielectric resistance, there is the thickness of the total of the interval in the space produced between above-mentioned end difference and the upper surface of substrate 22 and the thickness of substrate 22, the return loss (returnloss) of coaxial connector 30 is become minimum.The edge, periphery of dielectric 60 is formed as stepped by the part that the part and diameter that are held in above-mentioned space are less than this part.By the stair-stepping part making the Inner peripheral portions of substrate 22 enter into this dielectric 60, improve the degree of fitting tightly of dielectric 60 and substrate 22.
Further, be formed with all grooves 62 that following side is open in the edge, periphery of dielectric 60, in all grooves 62, be embedded with the seal 66 formed by O type ring.Seal 66 is pressed by substrate 22, elastic deformation occurs, fits tightly with substrate 22 and dielectric 60.This ensures that, the leakproofness that dielectric 60 and substrate 22 and housing 24 are mutual.
As shown in Figure 3, above-mentioned center conductor 50 is parts that the material of the electric conductivity of shape such by gyro (chess piece) is as a whole formed.Be formed with flange 51 on the top of the main part of center conductor 50, be extruded with 4 short pins 52 upward from the upper surface of flange 51 and the centerline axis parallel ground of center conductor 50.4 short pins 52 are equally spaced formed in the circumference of center conductor 50.
Paster antenna 41 is formed at the upper surface of the main part of center conductor 50.The bottom of center conductor 50 is provided with wire bonds 58.Each short pin 52 and paster antenna 41 are shaped integratedly with the main part of center conductor 50.
As shown in Figure 1, the main part of center conductor 50 is embedded in the state fitted tightly in the hole of the central part of dielectric 60.The inner peripheral portion upper surface side of dielectric 60 is formed with stage portion 64 throughout complete cycle on xsect, is embedded with the second seal 68 formed by O type ring in stage portion 64.Seal 68 contacts with perisporium with the bottom surface of above-mentioned stage portion 64, in addition, contacts with the lower surface of flange 51 with the perisporium of dielectric 60.Like this, center conductor 50 and the mutual leakproofness of dielectric 60 can be kept.
Airtight chamber 80 is defined by a part for the inner circumferential wall of housing 24 and the upper surface of dielectric 60 and center conductor 50.Paster antenna 41 is covered across chamber 80 by housing 24, thus paster antenna 41 is enclosed in chamber 80.Primarily of the volume of the internal diameter of housing 24, the external diameter decision chamber 80 of center conductor 50.
Be fixed with coaxial connector 30 in the upper face center of housing 24, this coaxial connector 30 connects for current supply cable, and the transceiver of outside and TM01 mode converter 20 link up by this cable.Conductor in coaxial connector 30 extends to chamber 80 as supply lines 34 at spaced intervals from the perisporium of the center pit 28 of housing 24, engages with power supply 36.Power supply 36 is the discoideus parts less than the diameter of paster antenna 41, separates less gap and is powered to paster antenna 41 by electrostatic capacitance coupling.Wherein, according to circumstances, supply lines 34 directly can be connected with paster antenna 41.
The bottom of center conductor 50 is provided with wire bonds 58.Wire bonds 58 is pressed into an end of wire 70.Wire 70 extends to the bottom of fluid box as described in detail in the back like that, so be applied in sizable load, and the load be applied in transversely because of the liquid surge in fluid box.Become following structure: these load put on housing 24 via the main part of center conductor 50, short pin 52, do not put on dielectric 60 and power supply 36.
With reference to Fig. 4, the shape of paster antenna 41 and each short pin 52 is further described.As shown in Figure 4, the shape of cross section being configured in each short pin 52 on paster antenna 41 is the shape cut off by two lines on two circular arcs of the size centered by the central axis of paster antenna 41 and the radial direction with the central angle θ of regulation centered by above-mentioned central axis and formed.If the radius of circular arc larger in above-mentioned two circular arcs is P, the radius of less circular arc is C.Be barrel surface along the lateral surface of each short pin 52 of these circular arcs and medial surface, but due to central angle θ smaller, so the shape of cross section of each short pin 52 is roughly trapezoidal shape.
As mentioned above, center conductor 50 is combined with the line for carry high frequency pulse signal, line is arranged in the state stretched in the vertical direction in the fluid box of storage liquid.Center conductor 50 is applied in the load of above-mentioned line, so center conductor 50 must be combined securely with housing 24.In order to center conductor 50 is firmly bonded to housing 24, such as, can adopt the extension arranging integratedly and extend upward from the upper end of 4 short pins 52 of center conductor 50, these extensions are pressed in the hole of housing 24 structure carrying out firmly connecting.Or, an integral part can be adopted with form center conductor 50 and housing 24 combined.
Fig. 5 represents the use-pattern of the embodiment of TM01 mode converter described above.In Fig. 5, the roof 86 of the fluid box 82 being arranged at oil tanker etc. is provided with the TM01 mode converter 20 that above-described embodiment relates to.Fluid box 82 comprises roof 86 and base plate 84, is made up of the metal as electric conductor, and the housing 24 of converter 20 is combined with roof 86, housing 24 ground connection across substrate 22.In addition, center conductor 50 also ground connection together with housing 24.The liquid 88 as loading is accommodated with, such as crude oil in fluid box 82.
The wire bonds 58 of center conductor 50 is combined with the upper end of wire 70, and the lower end of wire 70 is combined with the base plate 84 of fluid box 82.When high-frequency pulse signal being input to TM01 mode converter 20 via coaxial connector 30 from the transmitter of pulsed radar, power supply 36 transmits high-frequency pulse signal to paster antenna 41 that is relative to each other and electrostatic capacitance coupling.Input high-frequency pulse signal from power supply 36 pairs of paster antennas 41, the concentric circles thus around center conductor 50 centered by this central axis produces circular magnetic field.By this circular magnetic field, according to Fleming's right-hand rule, generation current in wire 70, this electric current transmits downward in wire 70.
When the high-frequency pulse signal of transmission in wire 70 arrives the upper surface of liquid 88, due to the difference of the impedance do not caused on an equal basis of the gas on the top of fluid box 82 and the relative dielectric constant of liquid 88, reflect at liquid level.High-frequency pulse signal after reflection transmits upward in wire 70, returns TM01 mode converter 20, is received by the receiver of pulsed radar.
This pulsed radar, in order to improve measuring accuracy, and makes the pulse width of pulse signal very little.Therefore, converter 20 is required to have the high carrier frequency of such as about 10GHz and the performance of the wide frequency bandwidth of such as about 10GHz.On this basis, load and the wire 70 of the wire 70 hung down from converter 20 shake produced load applying to converter 20 with the fluctuating of liquid 88.Converter 20 needs the structure that can tolerate above-mentioned load, and, seek the method for the reduction of the measuring accuracy avoiding the pulsed radar caused owing to being applied in above-mentioned load.
In this, in accordance with the embodiments illustrated, the load of wire 70 and the load of center conductor 50, as mentioned above, put on housing 24 via short pin 52.Housing 24 is supported by the roof 86 of fluid box 82, so the load applying putting on housing 24, in roof 86, does not put on dielectric 60 or power supply 36.So, even if due to wire 70 shake etc. and put on the load change of the wire bonds 58 of center conductor 50, the pressure putting on dielectric 60 or power supply 36 does not also change, electrical impedance also not change.Thus, when by the converter of the TM01 that the present invention relates to mode converter as the radar type measurement mechanism making electromagnetic wave transmit in the single line as above-mentioned wire 70, measuring accuracy can be improved.
The fluid box of liquid such as storage crude oil and liquefied gas etc. needs to be maintained airtight conditions, so above-mentioned converter 20 setting unit be arranged on fluid box also needs to be maintained airtight conditions.In the structure of illustrated converter 20, utilize seal 66 to seal between dielectric 60 and housing 24, utilize seal 68 to seal between dielectric 60 and center conductor 50, keep the impermeability of chamber 80.Housing 24 is arranged on the roof of fluid box 82 (with reference to Fig. 5) across suitable seal, therefore, also can keep the impermeability of fluid box 82.
Dielectric 60 also plays a role as the seal of fluid box 82.Material as dielectric 60 such as can use fluororesin.
TM01 mode converter requires the optimization realizing resonant frequency and bandwidth.According to the embodiment of the TM01 mode converter of the invention described above, the shape of short pin 52 is unique shape, uses paster antenna 41, can realize the optimization of resonant frequency and bandwidth thus.As the mode illustrated in the diagram, the shape of cross section of short pin 52 is trapezoidal shape.The difference of the thickness of the radial direction of the short pin 52 of trapezoidal shape and above-mentioned radius P and radius C affects the impedance of converter 20.The circumferential lengths L of the lateral surface of the length on the base of the short pin 52 of trapezoidal shape and the short-and-medium pin 52 of Fig. 4 affects the resonant frequency of converter 20.
In addition, the radius of paster antenna 41 also affects the resonant frequency of converter 20.The interval of power supply 36 and paster antenna 41 affects frequency bandwidth and the impedance of converter 20.Above-mentioned power supply 36 relative to each other and paster antenna 41 form capacitor, via the above-mentioned capacitor of connecting, high-frequency signal are supplied to paster antenna 41 from supply lines 34.Form the impedance of the capacitive effect converter 20 of the above-mentioned capacitor of this series-fed circuit.
According to the TM01 mode converter that above-described embodiment relates to, by adjusting the trapezoidal height (thickness of radial direction) of the short pin 52 of trapezoidal shape, the length (length of periphery) on trapezoidal base, resonant frequency and impedance can be set to the optimal design value being suitable for application target.In addition, by adjusting the radius of paster antenna 41, power supply 36 and the interval of paster antenna 41, the electrostatic capacitance of above-mentioned series capacitor, can be optimum value by the frequency bandwidth of converter 20 and impedance setting.
If resonant frequency and impedance setting are optimum value by aforesaid way, the constructing variable of adjustment chamber 80, when making the resonant frequency of chamber 80 become optimum value, can realize amplification and the optimization of the frequency bandwidth of converter 20.Especially, also combination is not known based on the content of paster antenna 41 pairs of frequency bandwidths and impedance adjustment to utilize the parameter of above-mentioned trapezoidal shape.In addition, the effect that the frequency bandwidth of converter 20 can be made to amplify neither be known.Like this, according to embodiments of the invention, the scope of application of TM01 mode converter can be expanded.
The structural parameters of chamber 80 and can the relation of optimized characteristic project as follows.
The internal diameter of chamber 80: resonant frequency
The external diameter of center conductor 50: frequency bandwidth, impedance
Industrial applicibility
The TM01 mode converter that the present invention relates to mainly lists the converter of the distance-measuring device such as liquid level gauge of pulsed radar formula, but also can be used as the converter of miscellaneous equipment.
Claims (8)
1. a TM01 mode converter, is characterized in that, comprising:
For the center conductor be combined with this wire under the state making wire hang down;
Be installed on the paster antenna of described center conductor;
By the power supply that electrostatic capacitance is coupled with described paster antenna;
Cover the housing of described paster antenna and described power supply; With
The dielectric of chamber is formed together with housing with described center conductor,
Described paster antenna is enclosed in described chamber,
Described center conductor has the short pin be combined as a whole with described housing, thus the load becoming the described wire putting on described center conductor puts on the structure of described housing via described short pin,
Described TM01 mode converter is provided with and runs through described housing and to the supply lines of described power supply supply high frequency pulse and coaxial connector,
The high-frequency pulse signal come from described coaxial connector supply is converted to the high-frequency pulse signal of TM01 pattern by described paster antenna.
2. TM01 mode converter as claimed in claim 1, is characterized in that:
The short pin of center conductor is multiple, and the plurality of short pin is pressed into housing, and described center conductor and described housing are combined as a whole.
3. TM01 mode converter as claimed in claim 1, is characterized in that:
Dielectric is held between substrate and housing.
4. TM01 mode converter as claimed in claim 3, is characterized in that:
Be folded with between substrate and dielectric and make in chamber, to keep airtight seal.
5. TM01 mode converter as claimed in claim 1, is characterized in that:
Be folded with between center conductor and dielectric and make in chamber, to keep the second airtight seal.
6. TM01 mode converter as claimed in claim 1, is characterized in that:
Frame ground.
7. TM01 mode converter as claimed in claim 1, is characterized in that:
Center conductor and housing are concentric circle, and the wire bonds of center conductor is positioned at described concentrically ringed center.
8. TM01 mode converter as claimed in claim 1, is characterized in that:
The shape of cross section of the short pin of center conductor is the trapezoidal shape being undertaken cutting off by two lines on two circular arcs of small one and large one centered by the central axis of center conductor and the radial direction with the central angle of regulation centered by described central axis and formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410320753.0A CN105241522A (en) | 2014-07-07 | 2014-07-07 | Tm01 mode converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410320753.0A CN105241522A (en) | 2014-07-07 | 2014-07-07 | Tm01 mode converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105241522A true CN105241522A (en) | 2016-01-13 |
Family
ID=55039248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410320753.0A Pending CN105241522A (en) | 2014-07-07 | 2014-07-07 | Tm01 mode converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105241522A (en) |
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2014
- 2014-07-07 CN CN201410320753.0A patent/CN105241522A/en active Pending
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Application publication date: 20160113 |