EP3714238A1 - Dispositif optique autocalibrant pour la mesure sans contact du niveau d'un liquide - Google Patents
Dispositif optique autocalibrant pour la mesure sans contact du niveau d'un liquideInfo
- Publication number
- EP3714238A1 EP3714238A1 EP18800224.0A EP18800224A EP3714238A1 EP 3714238 A1 EP3714238 A1 EP 3714238A1 EP 18800224 A EP18800224 A EP 18800224A EP 3714238 A1 EP3714238 A1 EP 3714238A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical
- liquid
- signal
- storage means
- level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 140
- 238000005259 measurement Methods 0.000 title claims abstract description 35
- 239000007788 liquid Substances 0.000 title claims abstract description 31
- 239000013307 optical fiber Substances 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 6
- 239000003758 nuclear fuel Substances 0.000 claims description 2
- 230000001902 propagating effect Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009532 heart rate measurement Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- G01F23/292—Light, e.g. infrared or ultraviolet
-
- 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
- G01F23/292—Light, e.g. infrared or ultraviolet
- G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
- G01F23/2928—Light, e.g. infrared or ultraviolet for discrete levels using light reflected on the material surface
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/02—Devices or arrangements for monitoring coolant or moderator
- G21C17/035—Moderator- or coolant-level detecting devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Definitions
- the invention relates to the field of non-contact measurement of the level of a liquid contained in a storage tank.
- the invention relates more particularly to a method and an optical device for accurately measuring the level of a liquid contained in a storage means, regardless of the measurement conditions and more particularly in degraded measurement conditions ( high temperatures, high humidity, heavy fog, boiling liquid).
- the invention finds a particularly interesting application for measuring the water level of the fuel pools of a nuclear power plant.
- electromechanical devices To continuously measure the water level in a fuel pool, it is known to use electromechanical devices. Such devices have a float and guided by a guide, the movements of the float closing at least one electrical circuit as it moves vertically along the guide.
- this type of sensor has limitations and poses difficulties in mounting pools already in use. Indeed, the liner on the wall of the pool must be drilled not far from the bottom to place a fastener and ensure maintenance of the guide in the bottom so as to avoid pendulum phenomena and excessive torsions guide.
- These devices are therefore often difficult to use in swimming pools.
- existing fuels or storage means of great depth, these devices are often limited to a measurement amplitude of less than 10 meters.
- Another known solution is to use the principle of ultrasonic wave pulses for non-contact measurement of the water level by means of a radar sensor.
- the ultrasonic waves emitted by the radar antenna are reflected by the surface of the water due to a dielectric coefficient change and then received by the receiver.
- the travel time of the ultrasonic waves is directly proportional to the distance traveled.
- the water level in the storage means can therefore be calculated from the moment when the position of the radar is accurately known.
- this type of radar pulse measurement is very sensitive to the presence of water vapor in the air, and especially when the air is saturated with 100% water vapor. Consequently, this technology is difficult to use to accurately measure the water level under degraded measurement conditions.
- this technology is difficult to exploit in a civilian nuclear environment because the radar positioned above a fuel pool has electrical / electronic components that make it sensitive to earthquakes, radiation, temperatures and pressures important at very high humidity in the ambient environment.
- the optical device described in CA 2730161 document comprises an optical unit, devoid of any electrical / electronic component, positioned above the tank and a dissociated electronic control unit, located at a distance from the optical unit, the two units being connected by two independent optical fibers.
- the optical unit transmits, on the basis of trigger signals (English trigger), a series of pulses which propagate in the form of an optical beam towards the surface fluid contained in the reservoir. Part of the optical beam is reflected back to the optical unit.
- the received signals are then processed by the electronic control unit to determine the distance between the optical unit and the fluid surface.
- the distance between the fluid surface and the optical unit is obtained by measuring the time taken by the pulses to go back and forth by means of an electronic clock.
- the optical unit comprises a transmission channel and a reception channel, each channel being independently connected to the electronic control unit by an optical fiber.
- the invention aims to overcome the drawbacks of the state of the art by providing an optical device for non-contact level measurement of a liquid to obtain an accurate measurement, reliable, repeatable, without calibration phase and usable in degraded measurement conditions that are those of the nuclear field and in deep storage means such as fuel pools having a depth of up to 20 meters.
- the invention proposes an optical device for non-contact measurement of the level of a liquid contained in a storage means by means of an optical signal, said optical device comprising an optical unit positioned in a fixed manner. above the storage means and an electronic control unit adapted to transmit an optical signal, dissociated from said optical unit and positioned at a distance from said optical unit, said optical device being characterized in that: the optical unit comprises a single channel for transmitting and receiving the optical signal;
- the optical unit is connected to the electronic control unit via an optical fiber capable of transmitting said optical signal emitted by the electronic control unit and an optical signal reflected by the liquid; said optical fiber having two optical cores juxtaposing so that at least a portion of the optical signal emitted in said first optical core of said optical fiber is backscattered in said second optical core.
- optical device according to the invention may also have one or more of the following features taken individually or in any technically possible combination:
- said first end of said optical fiber is located at said optical unit
- the two optical cores have a different diameter
- the optical core transmitting the optical signal emitted by the electronic control unit has a smaller diameter than the second optical core intended to receive the optical signal reflected by the surface of the liquid;
- said optical fiber has two distinct strands, each being composed of a single optical core
- the electronic control unit comprises means for determining the distance d separating said optical unit from the liquid contained in the storage means by measuring the flight time of the optical signal.
- the invention also relates to a method for determining the level of a liquid contained in a storage means by means of an optical device according to the invention characterized in that it comprises: a step of transmitting an optical signal by said electronic control unit: said optical signal propagating inside said optical fiber in the direction of the optical unit;
- a step of calculating the level of the liquid by determining the flight time between the instant ti of detection of the first return signal and the instant t2 of detection of the second return signal.
- the method for determining the level of a liquid is a method of detecting the water level in a nuclear reactor fuel pool.
- Figure 1 schematically illustrates a first embodiment of an optical device according to the invention for the non-contact measurement of the water level in a storage means, such as a fuel pool.
- FIG. 2 particularly illustrates one end of the optical fiber of the optical device according to the invention.
- Figure 3 is a block diagram illustrating the main steps of a method of determining a liquid level by means of the optical device according to the invention.
- FIG. 4 illustrates in the form of a graph the photons detected as a function of time by the control unit of the optical device according to the invention.
- Figure 5a illustrates the recovery rate obtained with the so-called monostatic optical device according to the invention in comparison with Figure 5b illustrating with the recovery rate obtained with a bistatic device according to the state of the art.
- the common elements bear the same references unless otherwise specified.
- Figure 1 schematically illustrates a first embodiment of an optical device 100 for the non-contact measurement of the water level 210 in a storage means 200, such as a fuel pool.
- the optical device 100 is particularly suitable for measuring the water level under degraded measurement conditions with high humidity and for example in the presence of a fog 220 located between the optical device 100 and the level of humidity. 210 water to measure.
- the storage means 200 is for example a fuel pool having a total depth (ht) of several tens of meters, typically of the order of 20 meters.
- the optical device 100 comprises an optical unit 110, devoid of any electrical / electronic component, positioned in a fixed manner above the storage means 200 and a dissociated electronic control unit 120, located at a distance of the optical unit 110 and the storage means 200, the two units 1 10, 120 being connected by an optical fiber 130 double-stranded 131, 132 and double cores.
- the electronic control unit 120 comprises:
- the emitter is a laser emitter which emits a laser pulse at a wavelength chosen specifically for its ability not to be interfered with in a medium saturated with water vapor; for example, the laser transmitter emits a pulse at 532 nm; a receiver connected to the second strand 132 of the optical fiber 130, such as a photomultiplier detector;
- a processing unit for measuring the flight time of the laser pulse between the emission and the reception of the laser pulse reflected by the surface of the water.
- the optical unit 110 comprises means for collimating the laser beam at the output of the optical fiber 130, to allow the parallelization of the rays towards the measurement point, to collect all the beams reflected on the surface of the These means are, for example, alignment lenses and / or collimating, focusing or beam expanding lenses.
- the optical unit has only one optical channel 112 for transmitting and receiving the optical beam.
- the optical fiber 130 is a double-core fiber at a first end (at the level of the control unit 120) in the form of two strands 131, 132 dissociated (ie each strand having a optical core surrounded by an optical sheath).
- the optical fiber 130 is in the form of a single cored 133 133, 135, the two cores 134, 135 being juxtaposed and surrounded by a single optical sheath 136.
- the entire optical fiber 130 may also be covered with a protective sheath (not shown).
- the two cores 134, 135 are juxtaposed and in direct contact with each other, that is to say they are each without their optical cladding or their protective sheath.
- the heart 134 is used for the transmission and the heart 135 having a larger diameter is used for the reception of the reflected signal so as to optimize the reception of the reflected signal.
- the two cores 134, 135 are juxtaposed over a defined length making it possible to backscatter the laser signal emitted between the two cores. This juxtaposition length can be for example between 0 and 10mm. However, it is also envisaged to juxtapose the two cores 134, 135 over a length greater than 10 mm in some configurations as long as the backscatter function is provided.
- the optical fiber 130 makes it possible, in addition to transmitting the laser signal emitted to the optical unit 110 via the core 134, to recover via the heart 135 a part of the laser signal emitted, by backscattering between the two cores 134, 135, and transmit it to the control unit 120.
- an optical fiber 130 with dual cores makes it possible to have a so-called monostatic system (ie with the use of the same optical channel both for the transmission and for the reception of the signal optical) and makes it possible to define a reference time for each measurement without the use of an external clock and without performing a prior calibration step.
- This is enabled by the diffusion of the laser pulse emitted through the strand 131 towards the strand 132 by virtue of the coupling of the two cores 134, 135 at a precise and known point, ie at the level of the optical unit 1 10 and more precisely from the top point of the storage means.
- the calculation of the water level 210 in the storage means 200 is carried out according to the block diagram illustrated in Figure 3 which illustrates the main steps of the level determination process. of water by means of the device 100.
- a first step 310 the laser transmitter of the control unit 120 emits a laser pulse at a reference time to.
- the laser pulse travels the optical fiber 130, and more particularly the first strand 131, to reach the second end of the optical fiber (monobrin) located at the optical block 1 10.
- a portion of the photons the laser pulse is collimated through the optical unit 1 10 and directed to the surface of the water and a part is backscattered from the first core 134 to the second core 135.
- the backscattered photons are sent to the control unit 120 via the second strand 132.
- a second step 320 the photomultiplier of the control unit 120 detects the backscattered photons of the signal emitted at a time ti (first peak shown in the graph of FIG. 4).
- the moment ti defining a temporal reference.
- the collimated portion of the laser pulse, directed towards the surface of the water, is reflected towards the optical unit, and the photons reflected and transmitted through the second strand 132 are picked up by the photomultiplier of the unit.
- the third step 330 of the method therefore consists of detecting the photons reflected by the surface of the water at a time t2 (second peak illustrated in the graph of FIG. 4).
- the control unit determines the measurement of the distance d by measurement of the time of flight (TOF for Time Of Flight in English) of the optical signal by difference between the first peak (said reference) detected at time ti and corresponding to the laser signal transmitted through the optical fiber 130 and backscattered back into the fiber 130, and the second peak detected at the instant t2 which corresponds to the reflected laser signal by the surface of the water, passing through the optical block and transmitted to the control unit 120 via the optical fiber 130.
- TOF Time Of Flight in English
- the optical device makes it possible to overcome any problem of time lag of an electronic clock.
- the optical device according to the invention also makes it possible to dispense with a prior calibration step insofar as it is not necessary to know the exact position of the optical unit 1 10. Indeed, this so-called monostatic solution and as illustrated in FIG. 5a, as opposed to known bistatic solutions of the state of the art and as illustrated in FIG. 5b using an optical block or channel for transmission and a block or separate optical channel for reception, is less sensitive to vibrations (no risk of misalignment of the two optical blocks). Thus, the measurement of the water level is carried out directly, robustly and reproducibly even in case of displacement of the optical unit due for example to vibrations of the tank. In addition, as shown in FIGS.
- the monostatic solution according to the invention makes it possible to have a better Tx coverage of the field of view of the optical block between the emission and the reception of the laser signal and makes it possible to achieve measurements at lower distances than with a bistatic device according to the state of the art illustrated for comparison with Figure 5b.
- optical fiber 130 to two cores 134, 135 juxtaposed at the optical unit also optimizes the recovery of the laser return signal following the reflection of the signal on the surface of the water and maximize the signal-to-noise ratio.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1760936A FR3073940B1 (fr) | 2017-11-20 | 2017-11-20 | Dispositif optique autocalibrant pour la mesure sans contact du niveau d'un liquide |
PCT/EP2018/081613 WO2019097013A1 (fr) | 2017-11-20 | 2018-11-16 | Dispositif optique autocalibrant pour la mesure sans contact du niveau d'un liquide |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3714238A1 true EP3714238A1 (fr) | 2020-09-30 |
Family
ID=61913248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18800224.0A Withdrawn EP3714238A1 (fr) | 2017-11-20 | 2018-11-16 | Dispositif optique autocalibrant pour la mesure sans contact du niveau d'un liquide |
Country Status (6)
Country | Link |
---|---|
US (1) | US11709087B2 (fr) |
EP (1) | EP3714238A1 (fr) |
JP (1) | JP7204764B2 (fr) |
CA (1) | CA3094116A1 (fr) |
FR (1) | FR3073940B1 (fr) |
WO (1) | WO2019097013A1 (fr) |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4417782A (en) * | 1980-03-31 | 1983-11-29 | Raychem Corporation | Fiber optic temperature sensing |
DE3113248A1 (de) * | 1981-04-02 | 1982-10-14 | Eppendorf Gerätebau Netheler + Hinz GmbH, 2000 Hamburg | Verfahren zur uebergabe von fluessigkeiten aus behaeltern und vorrichtung zur durchfuehrung des verfahrens |
US4692023A (en) * | 1983-07-30 | 1987-09-08 | Tokyo Kagaku Kikai Kabushiki Kaisha | Optical adapter for a light-wave rangefinder |
JPH0619432B2 (ja) | 1985-01-09 | 1994-03-16 | 株式会社トプコン | 液面高さ計測装置 |
JPS63169521A (ja) | 1987-01-07 | 1988-07-13 | Toshiba Corp | 変位計 |
JPH087261B2 (ja) | 1990-11-09 | 1996-01-29 | 株式会社オプテック | 光波距離測定方法及び光波距離計 |
JPH07280625A (ja) * | 1994-04-04 | 1995-10-27 | Opt:Kk | 光波レベル計 |
JPH08338849A (ja) * | 1995-04-11 | 1996-12-24 | Precision Syst Sci Kk | 液体の吸引判別方法およびこの方法により駆動制御される分注装置 |
JPH1090561A (ja) | 1996-09-10 | 1998-04-10 | Japan Aviation Electron Ind Ltd | 多チャンネル光モジュール |
JP2001242012A (ja) | 2000-02-25 | 2001-09-07 | Yokogawa Electric Corp | 干渉計及び分光分析計 |
US7447408B2 (en) | 2004-07-02 | 2008-11-04 | The General Hospital Corproation | Imaging system and related techniques |
US7999929B2 (en) * | 2004-08-02 | 2011-08-16 | The Furukawa Electric Co., Ltd. | Specimen optical information recognizing device and its recognizing method |
JP4751118B2 (ja) | 2005-07-21 | 2011-08-17 | 株式会社フジクラ | 光学式検出センサ |
JP4862594B2 (ja) | 2006-10-05 | 2012-01-25 | 日立電線株式会社 | 光ファイバセンサ |
CA2730161C (fr) * | 2008-07-10 | 2013-12-10 | Leddartech Inc. | Procede et appareillage pour la detection optique du niveau de surfaces de fluide sous agitation |
JP2011069726A (ja) | 2009-09-25 | 2011-04-07 | Hamamatsu Photonics Kk | 距離画像取得装置 |
US20120099112A1 (en) | 2010-10-25 | 2012-04-26 | Gerard Argant Alphonse | Multi-core low reflection lateral output fiber probe |
US9645004B2 (en) * | 2014-11-19 | 2017-05-09 | The Boeing Company | Optical impedance modulation for fuel quantity measurement comprising a fiber encased by a tube having a longitudinal slot with a lens |
JP2017062118A (ja) | 2015-09-22 | 2017-03-30 | 日本精機株式会社 | 液面検出装置 |
-
2017
- 2017-11-20 FR FR1760936A patent/FR3073940B1/fr active Active
-
2018
- 2018-11-16 JP JP2020545448A patent/JP7204764B2/ja active Active
- 2018-11-16 EP EP18800224.0A patent/EP3714238A1/fr not_active Withdrawn
- 2018-11-16 US US16/765,363 patent/US11709087B2/en active Active
- 2018-11-16 WO PCT/EP2018/081613 patent/WO2019097013A1/fr unknown
- 2018-11-16 CA CA3094116A patent/CA3094116A1/fr active Pending
Also Published As
Publication number | Publication date |
---|---|
US20200340847A1 (en) | 2020-10-29 |
JP2021503612A (ja) | 2021-02-12 |
CA3094116A1 (fr) | 2019-05-23 |
US11709087B2 (en) | 2023-07-25 |
JP7204764B2 (ja) | 2023-01-16 |
FR3073940B1 (fr) | 2019-11-08 |
FR3073940A1 (fr) | 2019-05-24 |
WO2019097013A1 (fr) | 2019-05-23 |
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