WO2004046662A1 - Procede de mesure de la hauteur d'un liquide au moyen d'une sonde a ligne haute frequence - Google Patents
Procede de mesure de la hauteur d'un liquide au moyen d'une sonde a ligne haute frequence Download PDFInfo
- Publication number
- WO2004046662A1 WO2004046662A1 PCT/FR2003/003382 FR0303382W WO2004046662A1 WO 2004046662 A1 WO2004046662 A1 WO 2004046662A1 FR 0303382 W FR0303382 W FR 0303382W WO 2004046662 A1 WO2004046662 A1 WO 2004046662A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- probe
- height
- measuring
- liquid
- circuit
- Prior art date
Links
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
- G01F23/24—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 variations of resistance of resistors due to contact with conductor fluid
-
- 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
- G01F23/24—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 variations of resistance of resistors due to contact with conductor fluid
- G01F23/241—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 variations of resistance of resistors due to contact with conductor fluid for discrete levels
- G01F23/243—Schematic arrangements of probes combined with measuring circuits
- G01F23/244—Schematic arrangements of probes combined with measuring circuits comprising oscillating circuits
Definitions
- the invention relates to a method for measuring the height of a liquid using a high frequency line probe and the probe used.
- Various probes are known for measuring the height of a liquid in a tank.
- the float probe is the oldest.
- the information comes from a triangulation driving, via pinions, a magnet inside a tank.
- Microwave probes are based on the radar principle.
- the transmission and reception of the wave emitted by a directive antenna are carried out. After reflection, we measure the time difference between transmission and reception. The consumption and the cost of production are important.
- a pulse is emitted on a coaxial line partially immersed in the liquid to be measured. At the time of the crossing of the liquid, part of the energy is reflected.
- the power at the source varies according to the time difference and therefore the level of the liquid. This method works well for liquids with high permittivity, but is very imprecise and not very reproducible for the measurement of liquids of low permittivity like hydrocarbons.
- the invention aims to remedy these drawbacks by proposing a measurement method based on the measurement of the characteristics of a high frequency line coaxial or not, in particular the impedance, through its module, its argument or its real or imaginary part. , which vary according to its physical dimensions and the characteristics of its dielectric.
- the method according to the invention is limited to the measurement of the impedance module of the probe line.
- the method according to the invention is characterized in that it consists in carrying out on an electrical circuit, supplied with high frequency alternating current, a comparison between the impedance of a probe with coaxial line or not and a reference resistance, at by means of a bridge resistive measurement, the probe immersed in a fluid reservoir whose height it is desired to determine constituting a measurement arm and said reference resistance constituting an opposite arm of the measurement bridge, the comparison signal resulting from the alternative measurement of the signal on each of the arm of the bridge by means of a suitable detector, and to process the comparison signal in order to obtain the calculation of the height of the liquid as a function of its permittivity, the length of the probe and the frequency of supply of the circuit.
- the probe is advantageously constituted by a simple tube or rod or metal wire of indifferent nature and of rectilinear shape, extending over the height of the liquid in the tank to be measured. Its length can vary from 0.1 to 10 m.
- This probe is in fact a high frequency line with an open end and therefore without contact with the bottom of the tank, consisting of the dielectric part formed by the fluid contained in the tank and the core of which is completed by the enclosure of the tank.
- the determination of the impedance of such a high frequency probe makes it possible to determine its characteristic of impedance module, fairly precisely, with current electronic processing means and to obtain a linear response of the signal for measuring the height of the liquid. with satisfactory accuracy, less than 1%; such a measurement is also possible with surrounding fluids of low permittivity, as can be encountered in petroleum products.
- the frequency range of the probe supply is advantageously between 4 and 20 MHz.
- the reference resistance is advantageously chosen to be substantially equal to that of the impedance of the probe module at mid-height of the liquid in the reservoir.
- the processing of the comparison signal is advantageously carried out in two stages, a stage of logarithmic amplifier then a terminal stage of differential amplifier.
- the logarithmic amplifier stage makes it possible to transform the signals from the arms of the measuring bridge into a difference, which is expressed by a ratio in the differential amplifier and is freed from any temperature, aging and other drifts of the high generator. frequency and the amplifier itself.
- a double synchronous switching is carried out, between the output of the measurement bridge and the input of the differential amplifier stage, of the signal coming from the arms of the bridge, so as to use only one amplifier. logarithmic for the first processing stage of the circuit.
- the signal from the arms alternately passes over the same logarithmic amplifier. This eliminates the differential drift from the use of two logarithmic amplifiers, one per arm measurement signal.
- the alternative measurement signals processed by the logarithmic amplifier are advantageously collected alternately by said synchronous switching on a capacitive circuit memorizing the information at the input of the terminal differential amplifier stage, to be taken up and then processed by this last.
- said double synchronous switching is advantageously controlled by a square pulse electrical pulse generator.
- the invention also relates to the probe used, namely the entire high frequency line for measuring the height of a liquid in an associated tank and the signal processing circuit for determining said height of the liquid in The reservoir.
- the single figure is a schematic view of the electrical circuit of the probe according to the invention.
- the assembly shows the assembly of the probe used according to the invention for measuring the height of a liquid of hydrocarbon type in a reservoir, namely consisting of a high frequency line 1 immersed in the liquid of the reservoir. on its height and its electrical measurement circuit 3.
- the tank is not shown.
- the measurement circuit 3 has been shown schematically. It comprises a high frequency power generator 5 (4 to 20 MHz), a measurement bridge 7 for the impedance of the line 1, a logarithmic amplifier 9 connected to the output of the measurement bridge 7, a differential amplifier 11, connected to the output of the logarithmic amplifier 9, a double synchronous switch 13 disposed between the terminals of the logarithmic amplifier 9 and an intermediate capacitive load circuit 15 disposed at the input of the differential amplifier 11.
- the measurement bridge 7 is a resistive bridge, comprising at the lower level the high frequency line 1 for measuring the height of the liquid (lower arm) and at the upper level (upper arm) a reference resistor 17 whose value is substantially equal to the module line impedance, when the reservoir liquid is halfway up in the latter.
- the value of this resistance may be equal to 2.5 times the characteristic impedance of the line, for example between 100 ⁇ and 1 k ⁇ .
- Line 1 consists of a simple metal rod (with open end) arranged vertically in the tank and over the measurement height of the liquid in the tank.
- the distance from the line to the bottom of the tank can be a few centimeters, so as to isolate it from the impurities deposited at the bottom and which can disturb the measurement.
- the synchronous switch 13 ensures by a first branch 13a the alternative transmission of the signal coming respectively from the upper arm and the lower arm of the bridge to the logarithmic amplifier for processing; it synchronously ensures by another branch 13b the storage of the alternating signal processed in two opposite branches 15a, 15b of the intermediate capacitive load circuit 15 before their transmission to the final stage of differential amplifier.
- This switching circuit is controlled by a generator 19 of square wave electrical pulses.
- the measurement signal of the line impedance module is compared with that of the reference resistance, the two signals are processed alternately, via the switch, by the logarithmic amplifier, are stored in the circuit intermediate load, via the switch, in sequence at each change of the pulse from the generator 19, then are compared and processed in the differential amplifier in order to determine the height of the liquid in the tank.
- the processed signal becomes respectively a stored log VI in the upper branch 15a of the intermediate load circuit, and a log V stored in the lower branch 15b of the intermediate load circuit, a being a coefficient dependent on the logarithmic amplifier.
- the formula is known and is not developed here.
- the measurement accuracy within the aforementioned field of application is less than one percent.
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/535,111 US7318345B2 (en) | 2002-11-15 | 2003-11-14 | Method of measuring the height of a liquid using a high-frequency line probe |
AU2003290203A AU2003290203A1 (en) | 2002-11-15 | 2003-11-14 | Method of measuring the height of a liquid using a high-frequency line probe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0214318A FR2847340B1 (fr) | 2002-11-15 | 2002-11-15 | Procede de mesure de la hauteur d'un liquide au moyen d'une sonde a ligne haute frequence et sonde utilisee |
FR02/14318 | 2002-11-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004046662A1 true WO2004046662A1 (fr) | 2004-06-03 |
Family
ID=32187639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2003/003382 WO2004046662A1 (fr) | 2002-11-15 | 2003-11-14 | Procede de mesure de la hauteur d'un liquide au moyen d'une sonde a ligne haute frequence |
Country Status (4)
Country | Link |
---|---|
US (1) | US7318345B2 (fr) |
AU (1) | AU2003290203A1 (fr) |
FR (1) | FR2847340B1 (fr) |
WO (1) | WO2004046662A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007007407A1 (de) * | 2007-02-12 | 2008-08-21 | Krohne S.A. | Füllstandsschalter und Verfahren zur Erfassung des Füllzustands eines in einem Behälter vorgesehenen Mediums |
DE102008020647A1 (de) * | 2008-04-24 | 2009-11-12 | Continental Automotive Gmbh | Vorrichtung zum Messen einer Sondenimpedanz |
FR2982361B1 (fr) | 2011-11-08 | 2014-10-10 | Jacques Morineau | Procede de mesure d'une hauteur d'un fluide contenu a l'interieur d'un reservoir |
CN103115656B (zh) * | 2013-03-06 | 2015-01-21 | 深圳市理邦精密仪器股份有限公司 | 一种液路位置检测的方法和装置 |
CN109459450B (zh) * | 2018-12-26 | 2023-12-19 | 江苏麦赫物联网科技有限公司 | 一种含水率和电导率检测系统及检测方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1121661A (fr) * | 1955-02-12 | 1956-08-23 | Appareil destiné à mesurer de façon continue le niveau du remplissage d'un réservoir | |
EP0360405A2 (fr) * | 1988-08-18 | 1990-03-28 | Texas Instruments Incorporated | Capteur du niveau du réfrigérant à deux fils |
EP0405835A2 (fr) * | 1989-06-28 | 1991-01-02 | Texas Instruments Incorporated | Capteur du niveau du réfrigérant à deux fils |
US6237412B1 (en) * | 1997-07-16 | 2001-05-29 | Nitta Corporation | Level sensor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4284951A (en) * | 1979-08-15 | 1981-08-18 | Dahl Ernest A | Battery electrolyte level sensor |
US6486679B1 (en) * | 2002-01-21 | 2002-11-26 | Kenneth David Holt | Wide-band ratiometric radio frequency bridge |
-
2002
- 2002-11-15 FR FR0214318A patent/FR2847340B1/fr not_active Expired - Fee Related
-
2003
- 2003-11-14 AU AU2003290203A patent/AU2003290203A1/en not_active Abandoned
- 2003-11-14 US US10/535,111 patent/US7318345B2/en not_active Expired - Fee Related
- 2003-11-14 WO PCT/FR2003/003382 patent/WO2004046662A1/fr not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1121661A (fr) * | 1955-02-12 | 1956-08-23 | Appareil destiné à mesurer de façon continue le niveau du remplissage d'un réservoir | |
EP0360405A2 (fr) * | 1988-08-18 | 1990-03-28 | Texas Instruments Incorporated | Capteur du niveau du réfrigérant à deux fils |
EP0405835A2 (fr) * | 1989-06-28 | 1991-01-02 | Texas Instruments Incorporated | Capteur du niveau du réfrigérant à deux fils |
US6237412B1 (en) * | 1997-07-16 | 2001-05-29 | Nitta Corporation | Level sensor |
Also Published As
Publication number | Publication date |
---|---|
FR2847340A1 (fr) | 2004-05-21 |
AU2003290203A1 (en) | 2004-06-15 |
FR2847340B1 (fr) | 2005-02-25 |
US7318345B2 (en) | 2008-01-15 |
US20060096368A1 (en) | 2006-05-11 |
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