SE504020C2 - Radar pulse depth measuring method for liquid in vessel e.g. hydrocarbon - Google Patents
Radar pulse depth measuring method for liquid in vessel e.g. hydrocarbonInfo
- Publication number
- SE504020C2 SE504020C2 SE9400857A SE9400857A SE504020C2 SE 504020 C2 SE504020 C2 SE 504020C2 SE 9400857 A SE9400857 A SE 9400857A SE 9400857 A SE9400857 A SE 9400857A SE 504020 C2 SE504020 C2 SE 504020C2
- Authority
- SE
- Sweden
- Prior art keywords
- pulse
- liquid
- container
- transmitter
- time
- 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
- G01F23/28—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)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
504 020 2 där H är avståndet mellan sändaren/mottagaren och behållarens botten, h är avståndet mellan sändaren/mottagaren och vätskeytan, tl är tiden för pulsens passage genom luften ovanför vätskeytan, t; är tiden för pulsens passage genom vätskan i behållaren, cl är pulshastigheten i luft och o; är pulshastigheten i behållarvätskan, medan T är den uppmätta tiden för den utsända pulsens återkomst till sändaren/mottagaren, beräknar man vätskenivån H-h i behållaren Tiden för ekot från bottnen består dels av tiden för pulsens väg genom luften, dels av tiden för pulsens väg genom vätskan. Pulshastigheten i luft är konstant ca 300.000 km/sek. Pulshasti gheten i en vätska är betydligt långsammare (och beror på den specifika vätskan). Med kännedom om A) avståndet mellan sändaren/mottagaren för radarpulsen och behållarens fasta botten; B) pulshastigheten i luft; C) pulshastigheten i behållarvätskan; D) tiden för bottenreflexen, kan man beräkna avståndet mellan vätskeytan och behållarbottnen d.v.s. vätskenivån i behållaren.. 504 020 2 where H is the distance between the transmitter / receiver and the bottom of the container, h is the distance between the transmitter / receiver and the liquid surface, t1 is the time for the passage of the pulse through the air above the liquid surface, t; is the time of passage of the pulse through the liquid in the container, cl is the pulse rate in air and o; is the pulse rate in the container liquid, while T is the measured time for the return of the transmitted pulse to the transmitter / receiver, the liquid level Hh in the container is calculated. The time for the echo from the bottom consists partly of the time of the pulse's path through the air . The pulse speed in air is constant about 300,000 km / sec. The pulse rate in a liquid is significantly slower (and depends on the specific liquid). With knowledge of A) the distance between the transmitter / receiver of the radar pulse and the fixed bottom of the container; B) the pulse rate in air; C) the pulse rate in the container liquid; D) the time of the bottom reflex, one can calculate the distance between the liquid surface and the container bottom, i.e. the liquid level in the container ..
Uppfinningen kommer i det följande att beskrivas närmare under hänvisning till ritningen, där Fig. 1 visar en anläggning för mätning av vätskenivåer i en behållare, Fig.2 visar mätningar av ytekon och boltcnekon vid två olika vätskenivåer, och Fig 3 visar ett blockdiagram av beräkningsfunktioner för realisenng av mätningar enligt föreliggande uppfinning.The invention will be described in more detail below with reference to the drawing, in which Fig. 1 shows a plant for measuring liquid levels in a container, Fig. 2 shows measurements of surface cone and bolt cone at two different liquid levels, and Fig. 3 shows a block diagram of calculation functions for realizing measurements according to the present invention.
I Fig. l betecknar l ett behållarlock för en behållare 2 med en botten 3. I locket 1 har en radarpulssändare/mottagare 4 - exempelvis av den typ som säljs av VEGA anordnats. Avståndet mellan locket 1 och bottnen 3 betecknas med H och är känt. Avståndet mellan locket l och en vätskeyta 4 betecknas med h. Pulshastigheten i luft är cl (känd), medan pulshastigheten i vätskan betecknas med o; (ävenledes känd - långsammare än cl).In Fig. 1, 1 denotes a container lid for a container 2 with a bottom 3. In the lid 1, a radar pulse transmitter / receiver 4 - for example of the type sold by VEGA, has been arranged. The distance between the lid 1 and the bottom 3 is denoted by H and is known. The distance between the lid 1 and a liquid surface 4 is denoted by h. The pulse rate in air is cl (known), while the pulse rate in the liquid is denoted by o; (also known - slower than cl).
I Fig. 2 är a) ett diagram av pulsekots amplitud A som funktion av tiden t vid en mellannivå för vätskan i behållaren 2, medan b) är motsvarande diagram vid en lägre nivå Som framgår av de båda diagrammen får man först ett litet eko - ekot från vätskeytan, medan det större ekot från bottnen 3 kommer senare. Skillnaden mellan diagrammen a) och b) är, att vid den lägre vätskenivån - (diagram b) - kommer ytekot senare, medan bottenekot kommer tidigare.In Fig. 2, a) is a diagram of the pulse echo amplitude A as a function of time t at an intermediate level of the liquid in the container 2, while b) is the corresponding diagram at a lower level. the echo from the liquid surface, while the larger echo from the bottom 3 comes later. The difference between diagrams a) and b) is that at the lower liquid level - (diagram b) - the surface echo comes later, while the bottom echo comes earlier.
Av ekvationema: 2h = c l-tl och 2X(H-l'l)=C2'l2 och tl +t2 = T = tiden för bottenekot där T, H samt cl och c; är kända, kan man beräkna l-l-h. 504 020 Fig. 3 visar f unktionema i beräkningsdatorn.Of the equations: 2h = c l-tl and 2X (H-l'1) = C2'l2 and tl + t2 = T = the time of the bottom echo where T, H and cl and c; are known, one can calculate l-l-h. 504 020 Fig. 3 shows the functions of the calculation computer.
Beräkningsenheten 10 får input = tiden T f ör bottenekot - från sändaren/mottagaren 4, input från mätning av det maximala avståndet = H från en enhet ll, samt input beträffande radarpulshastigheten = c; i det aktuella vätskemediet f rån en enhet 12. För en och samma vätska är det endast T som varierer. Nivån l-I-h blir en entydig funktion av bottenreflextiden T.The calculation unit 10 receives input = the time T for the bottom echo - from the transmitter / receiver 4, input from the measurement of the maximum distance = H from a unit 11, and input regarding the radar pulse speed = c; in the current liquid medium from a unit 12. For one and the same liquid, only T varies. The level l-I-h becomes an unambiguous function of the bottom reflex time T.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9400857A SE504020C2 (en) | 1994-03-11 | 1994-03-11 | Radar pulse depth measuring method for liquid in vessel e.g. hydrocarbon |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9400857A SE504020C2 (en) | 1994-03-11 | 1994-03-11 | Radar pulse depth measuring method for liquid in vessel e.g. hydrocarbon |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9400857D0 SE9400857D0 (en) | 1994-03-11 |
SE9400857L SE9400857L (en) | 1995-09-12 |
SE504020C2 true SE504020C2 (en) | 1996-10-21 |
Family
ID=20393273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9400857A SE504020C2 (en) | 1994-03-11 | 1994-03-11 | Radar pulse depth measuring method for liquid in vessel e.g. hydrocarbon |
Country Status (1)
Country | Link |
---|---|
SE (1) | SE504020C2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001029523A1 (en) * | 1999-10-21 | 2001-04-26 | Saab Marine Electronics Ab | Apparatus for measuring the level in a container |
NO20100519A1 (en) * | 2010-04-12 | 2011-10-13 | Kongsberg Maritime As | Method and apparatus for measuring the density of a liquid |
-
1994
- 1994-03-11 SE SE9400857A patent/SE504020C2/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001029523A1 (en) * | 1999-10-21 | 2001-04-26 | Saab Marine Electronics Ab | Apparatus for measuring the level in a container |
NO20100519A1 (en) * | 2010-04-12 | 2011-10-13 | Kongsberg Maritime As | Method and apparatus for measuring the density of a liquid |
NO331262B1 (en) * | 2010-04-12 | 2011-11-14 | Kongsberg Maritime As | Method and apparatus for measuring the density of a liquid |
Also Published As
Publication number | Publication date |
---|---|
SE9400857L (en) | 1995-09-12 |
SE9400857D0 (en) | 1994-03-11 |
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