NO850372L - VAESKENIVAAMAALER - Google Patents
VAESKENIVAAMAALERInfo
- Publication number
- NO850372L NO850372L NO850372A NO850372A NO850372L NO 850372 L NO850372 L NO 850372L NO 850372 A NO850372 A NO 850372A NO 850372 A NO850372 A NO 850372A NO 850372 L NO850372 L NO 850372L
- Authority
- NO
- Norway
- Prior art keywords
- pulse
- transmission line
- line
- terminated
- reflected
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 230000011514 reflex Effects 0.000 claims 4
- 239000012530 fluid Substances 0.000 claims 1
- 239000000523 sample Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Description
Foreliggende oppfinnelse angår en fremgangsmåte til, samt et apparat for måling av væskenivåer og lokalisering av grenseflater mellom væsker som ikke er blandbare med hverandre. The present invention relates to another method, as well as an apparatus for measuring liquid levels and locating interfaces between liquids that are not miscible with each other.
I US pat. nr. 3.424.002 er det beskrevet en fremgangsmåte til å fastlegge posisjonen til grenseflater mellom ulike materia-ler ved at en spenningspuls med bratt stigeflanke tilføres enden av en transmisjonslinje som passerer gjennom grenseflaten, og hvor denne pulsen delvis reflekteres tilbake av et hvilket som helst punkt hvor impedansen til linjen forandrer seg. Tidsintervallet mellom utsendelsen av en bratt spenningspuls og returen for dens refleksjon, representerer avstanden til refleksjons-punktet langs transmisjonslinjen. Ved et slikt arrangement har det vist seg visse vanskeligheter i praksis fordi det blir snakk om korte avstander og dermed korte tidsintervaller. Et formål med foreliggende oppfinnelse er derfor å tilveiebringe en fremgangsmåte og et apparat for å måle væskenivåer og lokalisere grenseflater som reduserer eller endog fjerner ulempene ved de kjente metoder. In US Pat. No. 3,424,002 describes a method for determining the position of interfaces between different materials by applying a voltage pulse with a steep rising edge to the end of a transmission line that passes through the interface, and where this pulse is partially reflected back by any point where the impedance of the line changes. The time interval between the sending of a steep voltage pulse and the return of its reflection represents the distance to the reflection point along the transmission line. With such an arrangement, certain difficulties have proven in practice because it involves short distances and thus short time intervals. An aim of the present invention is therefore to provide a method and an apparatus for measuring liquid levels and locating boundary surfaces which reduce or even remove the disadvantages of the known methods.
Dette oppnås ved å benytte fremgangsmåten eller apparaturenThis is achieved by using the method or the apparatus
i henhold til de nedenfor fremsatte patentkrav.in accordance with the patent claims set out below.
For å gi en klarere forståelse av foreliggende oppfinnelse vises til nedenstående detaljerte beskrivelse, samt til de led-sagende figurer. To provide a clearer understanding of the present invention, reference is made to the detailed description below, as well as to the accompanying figures.
Fig. 1 viser en transmisjonslinje 1 som består av to parallelle tråder og er viklet i skrueform omkring et støtteorgan 2, og hvor trådene er isolert fra hverandre i elektrisk henseende. Understøttelsesorganet med den påviklede transmisjonslinje utgjør således en målesonde for måling av nivået. På figuren er det vist at målesonden er montert slik at den rager ned i en beholder som er delvis fylt med væsker. Den nederste delen av væsken som er vist på figuren er vann, og den øverste delen er olje. Over oljenivået er beholderen fylt med luft, da den er åpen oventil. Øverst oppe på sonden er transmisjonslinjen avsluttet i en klemme 4, og denne klemmen er tilkoblet en pulsgenerator 3 og et oscilloskop 7. Overflaten til oljen, som altså grenser mot luft, er gitt henvisningstall 5, mens grenseflaten mellom olje og vann er gitt henvisningstall 6. Kjernen som transmisjonslinjen er viklet på, kan være hul eller massiv. Fig. 1 shows a transmission line 1 which consists of two parallel wires and is wound in a helical shape around a support member 2, and where the wires are electrically isolated from each other. The support member with the wound transmission line thus forms a measuring probe for measuring the level. The figure shows that the measuring probe is mounted so that it protrudes into a container that is partially filled with liquids. The bottom part of the liquid shown in the figure is water, and the top part is oil. Above the oil level, the container is filled with air, as it is open at the top. At the top of the probe, the transmission line is terminated in a clamp 4, and this clamp is connected to a pulse generator 3 and an oscilloscope 7. The surface of the oil, which therefore borders air, is given reference number 5, while the interface between oil and water is given reference number 6 .The core on which the transmission line is wound may be hollow or solid.
En puls (typisk med en varighet på 5 ns eller eventuelt enda kortere) fra pulsgeneratoren 3 sendes inn i transmisjonslinjen via klemmen 4 og forplanter seg nedover linjen med en hastighet som fastlegges av dielektrisitetskonstanten til mediet som omgir transmisjonslinjen. Der hvor det forekommer diskontinuiteter i dielektrisitetskonstanten, slik som ved overgangen 5 mellom luft og olje eller ved grenseflaten 6 mellom olje og vann, vil en del av den innfallende puls reflekteres og refleksen vil kunne detekteres på oscilliskopet 7. A pulse (typically with a duration of 5 ns or possibly even shorter) from the pulse generator 3 is sent into the transmission line via clamp 4 and propagates down the line at a speed determined by the dielectric constant of the medium surrounding the transmission line. Where there are discontinuities in the dielectric constant, such as at the transition 5 between air and oil or at the interface 6 between oil and water, part of the incident pulse will be reflected and the reflection will be detectable on the oscilloscope 7.
Tidsintervallet mellom utsending og puls og mottagelse av reflektert puls blir et mål for nivået til væsken ved det punkt hvor refleksjonen fant sted, dvs. ved øvre flate til væsken ved hvert overgangssted, og likeledes fås en refleksjon fra enden av linjen. Den nederste ende av linjen kan enten være avsluttet v.hj.a. en motstand eller en annen.impedans, dvs. at den ikke er bestemt i detalj her, men kan fastlegges av de praktiske om-stendigheter . The time interval between sending the pulse and receiving the reflected pulse becomes a measure of the level of the liquid at the point where the reflection took place, i.e. at the upper surface of the liquid at each transition point, and likewise a reflection is obtained from the end of the line. The bottom end of the line can either be terminated v.hj.a. a resistance or another impedance, i.e. it is not determined in detail here, but can be determined by the practical circumstances.
Tiden det tar for pulsen som reflekteres fra enden av linjen vil også kunne gi tilleggsinformasjon. Denne tidsvarigheten avhenger av den totale forplantningstid nedover linjen og vil derfor variere i overensstemmelse med forandringene i dielektrisitetskonstanten langs føleren. The time it takes for the pulse to be reflected from the end of the line will also provide additional information. This time duration depends on the total propagation time down the line and will therefore vary in accordance with the changes in the dielectric constant along the sensor.
Vanskelighetene med systemet som tidligere var kjent fra det omtalte US patent, skyldes liten romlig oppløsningsevne på grunn av de meget korte tidsintervaller som pulsen trenger for å til-bakelegge praktiske avstander. Dette er i foreliggende oppfinnelse unngått ved at transmisjonslinjen er viklet på støtteorganet langs en skruelinjeform, noe som bedrer tidsadskillelsen av grenseflater som ligger nær hverandre i rommet, og denne bedring i romlig oppløsningsevne avhenger selvsagt av stigningen til skrueviklingen,.og er i et arrangement som er prøvet eksperi-mentelt,, bedret med en faktor på 10. Dessuten benyttes hurtig elektronikk idet emitterkoblet logikk benyttes for signalbe-handlingen. The difficulties with the system which was previously known from the mentioned US patent are due to low spatial resolution due to the very short time intervals that the pulse needs to cover practical distances. This is avoided in the present invention by the fact that the transmission line is wound on the support member along a helical shape, which improves the time separation of boundary surfaces that are close to each other in space, and this improvement in spatial resolution obviously depends on the pitch of the helical winding, and is in an arrangement which has been tested experimentally, improved by a factor of 10. Furthermore, fast electronics are used as emitter-coupled logic is used for the signal processing.
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08402586A GB2153616B (en) | 1984-02-01 | 1984-02-01 | Liquid level measurement |
Publications (1)
Publication Number | Publication Date |
---|---|
NO850372L true NO850372L (en) | 1985-08-02 |
Family
ID=10555866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO850372A NO850372L (en) | 1984-02-01 | 1985-01-31 | VAESKENIVAAMAALER |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2153616B (en) |
NO (1) | NO850372L (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2365302B1 (en) * | 2010-02-25 | 2012-05-23 | Sick Ag | Measurement of the distance to at least one initial boundary area |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1448282A (en) * | 1973-01-30 | 1976-09-02 | Whessoe Ltd | Liquid level gauge |
-
1984
- 1984-02-01 GB GB08402586A patent/GB2153616B/en not_active Expired
-
1985
- 1985-01-31 NO NO850372A patent/NO850372L/en unknown
Also Published As
Publication number | Publication date |
---|---|
GB2153616B (en) | 1987-03-11 |
GB8402586D0 (en) | 1984-03-07 |
GB2153616A (en) | 1985-08-21 |
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