WO2014157356A1 - 電波レベル計 - Google Patents
電波レベル計 Download PDFInfo
- Publication number
- WO2014157356A1 WO2014157356A1 PCT/JP2014/058574 JP2014058574W WO2014157356A1 WO 2014157356 A1 WO2014157356 A1 WO 2014157356A1 JP 2014058574 W JP2014058574 W JP 2014058574W WO 2014157356 A1 WO2014157356 A1 WO 2014157356A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- waveguide
- transmission
- circuit board
- reception circuit
- radio wave
- Prior art date
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- 230000005540 biological transmission Effects 0.000 claims description 55
- 239000004020 conductor Substances 0.000 claims description 37
- 239000006096 absorbing agent Substances 0.000 claims description 5
- 239000003989 dielectric material Substances 0.000 claims 1
- 239000000758 substrate Substances 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000003251 chemically resistant material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/087—Transitions to a dielectric waveguide
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
- H01P5/107—Hollow-waveguide/strip-line transitions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
Definitions
- the present invention relates to a radio wave level meter that measures the level of an object to be measured by radio waves, and more particularly, a radio wave having a connection structure for connecting a transmission / reception circuit board built in a housing and an antenna unit for transmitting / receiving radio waves.
- a radio wave having a connection structure for connecting a transmission / reception circuit board built in a housing and an antenna unit for transmitting / receiving radio waves.
- a transmission / reception circuit board that is built in a housing and formed with a transmission / reception circuit, and an antenna unit that protrudes vertically into a container in which a device under test is stored in order to transmit / receive radio waves Therefore, a connection structure for connecting the antenna unit to the transmission / reception circuit board is necessary.
- the transmission / reception circuit board is disposed horizontally in the housing, and includes a connection tool for connecting the housing and the probe (antenna unit).
- the connector includes a center conductor, and one end of the center conductor is inserted into a hole formed in the transmission / reception circuit board to make direct electrical contact, and the other end of the center conductor is electrically connected to the probe. It has become.
- Patent Document 1 since the transmission / reception circuit board is installed horizontally, there is a problem that it occupies the area in the horizontal direction and it is difficult to reduce the size in the horizontal direction. In the field where such a radio wave level meter is installed, other devices are often installed side by side in the horizontal direction, and downsizing in the horizontal direction is desired. In addition, since the position of the hole that receives one end of the central conductor of the connection tool is constrained to be approximately the center position of the transmission / reception circuit board, there is also a problem that the design flexibility of the transmission / reception circuit board is small.
- Patent Document 1 On the other hand, in the example shown in the prior art (FIG. 1) of Patent Document 1 assuming that the transmission / reception circuit board is arranged in the vertical direction, the transmission / reception circuit board is arranged in the casing in the vertical direction.
- the coaxial cable is extended.
- the plug connection type connector indicated in patent documents 2 as what connects this coaxial cable and an antenna part is known.
- the plug connection type connector disclosed in Patent Document 2 includes a plug connected to an end portion of the coaxial cable extending from a transmission / reception circuit board and a socket connected to an end portion of the coaxial line on the antenna side.
- the plug-side inner conductor and the socket-side inner conductor are in contact with each other, and the plug-side outer conductor and the socket-side outer conductor are connected by capacitive coupling via a dielectric.
- the transmission / reception circuit and the antenna unit are connected while insulating the ground on the circuit side and the ground on the antenna side.
- the present invention has been made in view of the above problems, and provides a radio wave level meter having a connection structure that can reduce the size in the horizontal direction and suppress reflection / loss and connect the transmission / reception circuit board and the antenna unit.
- the purpose is to do.
- the present invention has a transmission / reception circuit board built in a housing, an antenna unit for transmitting and receiving radio waves, and a connection structure for connecting the transmission / reception circuit board and the antenna unit.
- the transmission / reception circuit board is arranged in the vertical direction in the housing, and the connection structure is constituted by a waveguide fed from a feeding terminal formed on the transmission / reception circuit board. The waveguide is connected to the antenna unit from the transmission / reception circuit board.
- a circular waveguide extending in the horizontal direction perpendicular to the transmission / reception circuit board, a rectangular waveguide connected to the circular waveguide and extending in the vertical direction, and further connected to the rectangular waveguide And a second circular waveguide extending in the vertical direction.
- a dielectric can be filled in the waveguide across the boundary between the rectangular waveguide and the second circular waveguide.
- An insulating dielectric that insulates the ground conductor of the transmission / reception circuit board from the housing may be disposed around the dielectric at the boundary between the rectangular waveguide and the second circular waveguide.
- the rectangular waveguide side end and the second circular waveguide side end of the dielectric filled in the waveguide may be tapered continuously or stepwise toward the tip.
- a radio wave absorber can be attached to a part of the outer periphery of the dielectric filled in the waveguide.
- the dielectric filled in the waveguide can be configured as a dielectric rod having a square cross section at the proximal end and a circular cross section at the distal end.
- the transmission / reception circuit board, the ground conductor of the transmission / reception circuit board, the non-conductive case, and the dielectric rod can be inserted into the casing as a unit.
- the transmission / reception circuit board is arranged in the vertical direction in the casing, it is possible to reduce the size in the horizontal direction, and the connection structure is configured by the waveguide and arranged in the vertical direction. Since the transmission / reception circuit board and the antenna unit are connected by the circular waveguide, the rectangular waveguide, and the second circular waveguide, the loss can be suppressed to be small and the traveling direction of the radio wave can be smoothly made from the horizontal direction. It can be changed in the vertical direction.
- the power supply terminal formed on the transmission / reception circuit board does not necessarily need to be arranged at the center of the transmission / reception circuit board, and it is only necessary that the position of the circular waveguide corresponds to the power supply terminal. Has a high degree of positional freedom.
- FIG. 1 It is a schematic sectional drawing of the electromagnetic wave level meter by embodiment of this invention.
- A) is an enlarged cross-sectional view of the main part of FIG. 1
- (b) is a view taken in the direction of arrow b in (a)
- (c) is a cross-sectional view taken along the line cc in (a)
- (D) is a sectional view taken along line dd in (a).
- the radio wave level meter 10 As shown in FIGS. 1 and 2, the radio wave level meter 10 according to the present embodiment is roughly provided with a casing 12 made of metal on the upper side and an antenna part 14 on the lower side.
- a casing 12 made of metal on the upper side
- an antenna part 14 on the lower side.
- the casing 12 defines a substantially cylindrical inner space 12a having a bottom with a central axis facing a vertical direction (see FIGS. 1 and 4), and a bottom portion of the substantially cylindrical inner space 12a. Defines a circular center hole 12b having a circular cross section smaller in diameter than the substantially cylindrical inner space 12a, and the circular center hole 12b is connected to the antenna portion 14.
- a cap 24 is detachably attached so as to cover the upper opening of the substantially cylindrical internal space 12a of the housing 12.
- a circuit unit 30 is built in the substantially cylindrical inner space 12 a of the housing 12. 2, the circuit unit 30 is further attached to the transmission / reception circuit board 32 on which the transmission / reception circuit is formed, the ground conductor 34 provided on the back surface of the substrate 32, and the back surface of the ground conductor 34. Similarly, a conductor case 36 that functions as a ground conductor, a non-conductive case 38 made of plastic or the like that at least partially surrounds the transmission / reception circuit board 32, the ground conductor 34, and the conductor case 36, a dielectric rod 40, Have The circuit unit 30 can further include other substrates and the like.
- a microstrip line for transmitting microwaves is formed on the transmission / reception circuit board 32, and a power supply terminal 32a is formed at an end thereof (FIG. 2B).
- a circular through hole 34a is formed in the ground conductor 34 corresponding to the position of the power supply terminal 32a.
- the conductor case 36 is formed with a square groove 36a having a square cross section on the surface facing the back surface of the ground conductor 34 (FIG. 2C), and one end of the square groove 36a communicates with the circular through hole 34a.
- the other end of the rectangular groove 36 a communicates with the circular center hole 12 b of the housing 12.
- a circular waveguide W1 extending in the horizontal direction is formed by the circular through hole 34a
- a rectangular waveguide W2 extending in the vertical direction is formed by the rectangular groove 36a
- a circular waveguide extending in the vertical direction by the circular center hole 12b.
- a tube W3 is formed (FIG. 2D), and a connection structure for connecting the transmission / reception circuit board 32 and the antenna unit 14 is constituted by these waveguides.
- the end face on the proximal end side of the rectangular groove 36a is not a vertical plane perpendicular to the longitudinal direction of the rectangular groove 36a, but a slightly inclined inclined surface. It is 36b.
- radio waves can be smoothly transmitted from the circular waveguide W1 to the vertical rectangular waveguide W2.
- By forming such an inclined surface or the like, radio waves can be transmitted more efficiently than when circular waveguides are connected orthogonally.
- the dielectric rod 40 is inserted so as to fill a part of the above waveguide.
- the dielectric rod 40 may be made of a chemically resistant material such as polytetrafluoroethylene (PTFE) or tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA).
- PTFE polytetrafluoroethylene
- PFA perfluoroalkyl vinyl ether copolymer
- the base end portion 40a of the dielectric rod 40 has a rectangular cross section that matches the cross section of the rectangular groove 36a, and is inserted into the rectangular waveguide W2.
- the distal end portion 40b of the dielectric rod 40 has a circular cross section that matches the cross section of the circular central hole 12b of the housing 12, and is inserted halfway through the circular waveguide W3.
- a part of the base end portion 40a of the dielectric rod 40 is cut out to form a stepped portion 40c.
- variety of the part of a base end side is further narrowed gradually toward an edge part rather than the step part 40c.
- the circular waveguide W1 and the rectangular waveguide W2 are formed together with the shape of the inclined surface 36b at the end of the rectangular groove 36a. Therefore, it is possible to achieve matching at a discontinuous portion such as the transition portion and the base end portion 40a of the dielectric rod 40, and to reduce reflection.
- a conical portion 40d is formed at the end of the tip 40b of the dielectric rod 40, and the outer diameter gradually decreases toward the end.
- the shape of the end portion of the tip portion 40b of the dielectric rod 40 can match the tip portion 40b of the dielectric rod 40 as a discontinuous portion in the circular waveguide W3, thereby reflecting the reflection. Can be reduced.
- An annular recess 40e is formed on the outer peripheral surface of the tip 40b of the dielectric rod 40, and a sheet-like electromagnetic wave absorber 46 is disposed in the annular recess 40e (FIG. 2).
- the dielectric rod 40 is prevented from falling off from the circuit unit 30 by a drop prevention pin 41 that passes through the dielectric rod 40 and is laid between the ground conductor 34 and the conductor case 36.
- the base end portion 40a is surrounded by the conductor case 36 and the ground conductor 34, whereas the tip end portion 40b protrudes from the circuit unit 30 (FIG. 5).
- the dielectric rod 40 may be prevented from falling off by any dropping prevention means other than the dropping prevention pin 41.
- the nonconductive case 38 is provided so that the ground conductor 34 and the conductor case 36 of the circuit unit 30 are not in direct electrical contact with the housing 12, and the nonconductive case 38 is directly fastened to the housing 12.
- the circuit unit 30 is fixed in the substantially cylindrical inner space 12a of the housing 12, and the transmission / reception circuit board 32, the ground conductor 34, and the conductor case 36 are arranged in the vertical direction in the substantially cylindrical inner space 12a.
- the circuit unit 30 is arranged so as to occupy the plane including the central axis in the substantially cylindrical inner space 12a or the vicinity thereof, so that the inside of the substantially cylindrical inner space 12a can be effectively used (see FIG. 4).
- a circular recess 12c is formed around the circular center hole 12b on the bottom surface of the substantially cylindrical internal space 12a, and a disk-shaped insulating dielectric plate 42 is fitted into the circular recess 12c.
- the insulating dielectric plate 42 prevents the ground conductor 34 and the casing 12 from being in direct electrical contact and is coupled only by capacitive coupling.
- the insulating dielectric plate 42 can be made of PTFE, PFA, or a combination thereof, and can be made of one part or a plurality of parts.
- the insulating dielectric plate 42 is provided with a flange 42a that has two steps in a stepped manner and extends outward from the circular recess 12c.
- the dielectric rod 40 is disposed so as to penetrate the dielectric plate 42 for insulation. Accordingly, the insulating dielectric plate 42 is provided at the boundary portion between the rectangular waveguide W2 and the circular waveguide W3, and by adjusting the shape or the like, the boundary portion is aligned with the dielectric rod 40. , Suppressing reflection.
- the dimensions of the above components may be adjusted as appropriate according to the frequency of the radio wave used, but the diameter of the circular section of the tip 40b of the dielectric rod 40 is A, and as shown in FIG.
- the diameter of the portion to be fitted into the circular center hole 12b is B
- the thickness of the dielectric plate 42 for insulation is C
- one side of the rectangular cross section of the base end portion 40a of the dielectric rod 40 is D
- the other side is E
- the base end When the vertical length of the cutout portion 40a is F and the horizontal length of the remaining portion of the cutout is G
- B 1.6 to 2.4A
- C 0.3 to 0.6A
- D 0.5 to 0.8A
- E 0.6 to 0.9A
- F 0.2 to 0.4A
- G 0.3 to 0.5A.
- the angle ⁇ of the inclined surface 36b at the end face of the square groove 36a is preferably larger than 90 ° and not larger than 135 °.
- the insulating dielectric plate 42 is inserted into the housing 12 from the upper opening thereof, and the substantially cylindrical inner space 12a is formed. It fits into the circular recess 12c on the bottom surface.
- the pre-assembled circuit unit 30 is inserted from above the housing 12. At this time, the tip 40b of the dielectric rod 40 protruding from the circuit unit 30 is aligned with the circular center hole 12b of the housing 12 and inserted into the circular center hole 12b.
- the non-conductive case 38 of the circuit unit 30 is fastened to the housing 12 with screws 48 or the like, so that the transmission / reception circuit board 32 and the antenna unit 14 in the housing 12 can be connected.
- the insulating dielectric plate 42 and the nonconductive case 38 can prevent direct electrical contact between the ground conductor 34 and the conductor case 36 and the housing 12.
- circuit unit 30 is unitized, it is possible to easily assemble the circuit unit 30 by inserting the circuit unit 30 into the substantially cylindrical inner space 12a of the housing 12, and the transmission / reception circuit board 32 is arranged in the vertical direction. Can be arranged.
- the antenna unit 14 is connected to the casing 12 and connected to a circular waveguide W3 formed by the circular center hole 12b of the casing 12.
- the antenna unit 14 can have an arbitrary configuration.
- the antenna unit 14 is an example using a horn antenna.
- the present invention is not limited to this, and an example using a rod antenna is also possible. It is.
- radio wave level meter configured as described above, power is supplied to the circular waveguide W1 from the power supply terminal 32a of the transmission / reception circuit board 32 on which the transmission / reception circuit is formed, propagates through the rectangular waveguide W2, and further, circular guide It propagates through the wave tube W3 and is radiated from the antenna unit 14.
- the power supply terminal 32a of the transmission / reception circuit board 32 and the antenna unit 14 are connected via the waveguide, the loss can be suppressed small.
- the traveling direction of the radio wave can be smoothly changed from the horizontal direction to the vertical direction by the circular waveguide and the rectangular waveguide.
- the transmission / reception circuit board 32 and the ground conductor 34 on which the transmission / reception circuit is formed are arranged in the vertical direction, it is possible to reduce the size in the horizontal direction.
- the power supply terminal 32a formed on the transmission / reception circuit board 32 is not necessarily arranged at the center of the transmission circuit board 32, and the position of the circular waveguide W1 formed by the circular through hole 34a corresponds to the power supply terminal 32a. Therefore, the position flexibility of the power feeding terminal 32a is high.
- a dielectric rod 40 is provided at a portion that changes from the rectangular waveguide W2 to the circular waveguide W3, and the ground conductor 34 and the housing are formed by the insulating dielectric plate 42 provided around the dielectric rod 40. Insulation with No. 12 and corresponding to explosion-proof. The ground conductor 34 performs grounding different from that of the housing 12 by wiring (not shown). Due to the presence of the dielectric rod 40, radio waves can be constrained in the dielectric rod 40 as compared with the case where only air is used, and reflection and leakage at this insulating portion can be further suppressed. Further, since reflection and leakage can be prevented by the dielectric rod 40, the insulating dielectric plate 42 can be made thick, so that the insulation can be enhanced.
- the end portions of the base end portion 40a and the tip end portion 40b of the dielectric rod 40 are shaped so as to taper continuously or stepwise, it is possible to prevent reflection at this portion. it can. Further, a higher order mode that may propagate in the dielectric rod 40 in a reciprocal manner can be prevented by absorbing it by the radio wave absorber 46 provided on the outer peripheral surface of the dielectric rod 40.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Waveguide Aerials (AREA)
- Radar Systems Or Details Thereof (AREA)
- Computer Networks & Wireless Communication (AREA)
Abstract
Description
筐体内で送受信回路基板が鉛直方向に配置されており、接続構造は、送受信回路基板に形成された給電端子から給電される導波管によって構成され、導波管は、送受信回路基板からアンテナ部に向かって、送受信回路基板に対して直交するようにして水平方向に延びる円形導波管と、該円形導波管に繋がり鉛直方向に延びる方形導波管と、該方形導波管にさらに繋がり鉛直方向に延びる第2円形導波管とを有することを特徴とする。
12 筐体
14 アンテナ部
30 回路ユニット
32 送受信回路基板
32a 給電端子
34 グランド導体
38 非導電性ケース
40 誘電体ロッド
42 絶縁用誘電体プレート
46 電波吸収材
W1 円形導波管
W2 方形導波管
W3 円形導波管
Claims (7)
- 筐体に内蔵された送受信回路基板と、電波の送受信を行うアンテナ部と、送受信回路基板とアンテナ部とを接続するための接続構造とを有し、電波によって被測定物のレベルを測定する電波レベル計において、
筐体内で送受信回路基板が鉛直方向に配置されており、接続構造は、送受信回路基板に形成された給電端子から給電される導波管によって構成され、導波管は、送受信回路基板からアンテナ部に向かって、送受信回路基板に対して直交するようにして水平方向に延びる円形導波管と、該円形導波管に繋がり鉛直方向に延びる方形導波管と、該方形導波管にさらに繋がり鉛直方向に延びる第2円形導波管とを有することを特徴とする電波レベル計。 - 方形導波管と第2円形導波管との境界部分に跨り、導波管内には誘電体が充填されることを特徴とする請求項1記載の電波レベル計。
- 方形導波管と第2円形導波管との境界部分において、前記誘電体の周囲には、送受信回路基板のグランド導体と筐体との絶縁を行う絶縁用誘電体が配置されることを特徴とする請求項2記載の電波レベル計。
- 前記導波管内に充填される誘電体の方形導波管側端部と第2円形導波管側端部は、それぞれ先端に向かうに従って連続的または段階的に先細り形状となっていることを特徴とする請求項2または3記載の電波レベル計。
- 前記導波管内に充填される誘電体の外周の一部に電波吸収材が装着されることを特徴とする請求項2ないし4のいずれか1項に記載の電波レベル計。
- 前記導波管内に充填される誘電体は、基端側が断面方形で、先端側が断面円形の誘電体ロッドとして構成されることを特徴とする請求項2ないし5のいずれか1項に記載の電波レベル計。
- 前記送受信回路基板、送受信回路基板のグランド導体、非導電性ケース及び前記誘電体ロッドがユニットとして筐体内に差し込まれることを特徴とする請求項6記載の電波レベル計。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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KR1020157024275A KR101748059B1 (ko) | 2013-03-29 | 2014-03-26 | 전파 레벨 미터 |
CN201480017206.3A CN105102942B (zh) | 2013-03-29 | 2014-03-26 | 电波水平仪 |
US14/780,497 US9863800B2 (en) | 2013-03-29 | 2014-03-26 | Radar level gauge |
EP14776250.4A EP2980539B1 (en) | 2013-03-29 | 2014-03-26 | Radio-wave level meter |
Applications Claiming Priority (2)
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JP2013072204A JP6097119B2 (ja) | 2013-03-29 | 2013-03-29 | 電波レベル計 |
JP2013-072204 | 2013-03-29 |
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US (1) | US9863800B2 (ja) |
EP (1) | EP2980539B1 (ja) |
JP (1) | JP6097119B2 (ja) |
KR (1) | KR101748059B1 (ja) |
CN (1) | CN105102942B (ja) |
WO (1) | WO2014157356A1 (ja) |
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JP6097119B2 (ja) * | 2013-03-29 | 2017-03-15 | 東京計器株式会社 | 電波レベル計 |
DE102014107393B4 (de) * | 2014-05-26 | 2020-04-23 | Krohne S. A. S. | Abschlusselement für Füllstandmessgerät und Füllstandmessgerät |
DE102016101756A1 (de) * | 2016-02-01 | 2017-08-03 | Vega Grieshaber Kg | Verfahren zur Bestimmung und Anzeige der optimalen Materialstärke bei der Füllstandmessung mit Radarsensoren |
US10114067B2 (en) * | 2016-02-04 | 2018-10-30 | Advantest Corporation | Integrated waveguide structure and socket structure for millimeter waveband testing |
JP6232149B1 (ja) * | 2017-01-10 | 2017-11-15 | ムサシノ機器株式会社 | 高位液面警報装置 |
US20180219288A1 (en) * | 2017-01-30 | 2018-08-02 | Michael Benjamin Griesi | Wideband Dielectrically Loaded Rectangular Waveguide to Air-filled Rectangular Waveguide Adapter |
EP3418700A1 (de) | 2017-06-21 | 2018-12-26 | VEGA Grieshaber KG | Füllstandradargerät mit automatisierter frequenzanpassung |
US11047725B2 (en) * | 2018-04-26 | 2021-06-29 | Rosemount Tank Radar Ab | Radar level gauge system with dielectric antenna |
KR101961672B1 (ko) * | 2018-06-11 | 2019-03-26 | 두온시스템(주) | 레이더 레벨 측정 장치 |
JP7186041B2 (ja) * | 2018-09-12 | 2022-12-08 | 株式会社Soken | 点火装置 |
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- 2014-03-26 CN CN201480017206.3A patent/CN105102942B/zh active Active
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EP2980539A1 (en) | 2016-02-03 |
EP2980539A4 (en) | 2016-11-16 |
KR20150128692A (ko) | 2015-11-18 |
CN105102942A (zh) | 2015-11-25 |
JP2014196936A (ja) | 2014-10-16 |
EP2980539B1 (en) | 2020-12-23 |
CN105102942B (zh) | 2018-04-10 |
JP6097119B2 (ja) | 2017-03-15 |
KR101748059B1 (ko) | 2017-06-15 |
US20160041023A1 (en) | 2016-02-11 |
US9863800B2 (en) | 2018-01-09 |
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