CN101520395A - Method and device for liquid density measurement - Google Patents
Method and device for liquid density measurement Download PDFInfo
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- CN101520395A CN101520395A CN200910061321A CN200910061321A CN101520395A CN 101520395 A CN101520395 A CN 101520395A CN 200910061321 A CN200910061321 A CN 200910061321A CN 200910061321 A CN200910061321 A CN 200910061321A CN 101520395 A CN101520395 A CN 101520395A
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- shaped pipe
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Abstract
The invention discloses a method for liquid density measurement. The method comprises the following steps: arranging two U-shaped pipes in parallel; filling the first U-shaped pipe with a liquid to be measured, and filling the second U-shaped pipe with a standard liquid; applying the same pressure to the two U-shaped pipes simultaneously; and reading the pixel difference between the liquid levels of the two U-shaped pipes through a camera, converting the pixel difference between the liquid levels into the real difference between the liquid levels, and working out the density of the liquid to be measured according to the real difference between the liquid levels and the density of the standard liquid. The invention also provides a device for realizing the method. The device comprises the two U-shaped pipes arranged in parallel. The U-shaped pipes are communicated through a three-way pipe which is also connected with a rubber ball through a control valve. In addition, the camera aims at ports of the first U-shaped pipe and the second U-shaped pipe which are connected with the three-way pipe, and is connected with a processor. The method and the device have simple realization and high operability, and improve the working efficiency and the measurement reliability.
Description
Technical field
The invention belongs to density measure and technical field of visual measurement, be specifically related to a kind of measuring method and device of fluid density.
Background technology
Density is one of inherent characteristic parameter of liquid, i.e. the quality of contained liquid in the per unit volume, and its unit is kilograms per cubic meter or gram/cubic centimetre.The measurement of fluid density has significance in metering, scientific research and commercial production.Present industrial widespread use densitometer or experimental method are measured fluid density.Densitometer is an instrumentation of measuring fluid density, and it is the equilibrium principle that suspends according to object.Will measure with different densitometers with the liquid less than water greater than water for density, the scope of measurement is also smaller (probably at 0.7～2.0g/cm
3In the scope).And measure density of liquid with experimental method, and though precision can have certain assurance, to operate more loaded down with trivial detailsly, efficient is low.
Read liquid level whether reach require height or when reading fluid density numerical value, what take usually is artificial reading, promptly reaches the numerical value of rule by feat of operating personnel's naked-eye observation liquid level.The degree of accuracy of artificial level gauging it is generally acknowledged that the rule precision that is to use adds ± personal error of 2mm.Accuracy requirement than higher measurement in, the measuring method that this degree of accuracy and efficient are all lower obviously is difficult to satisfy the demand.
Summary of the invention
The object of the present invention is to provide a kind of liquid density measurement method, simple to operate, the measuring accuracy height.
Another object of the present invention is to provide a kind of measurement mechanism of realizing said method, simple in structure, the measuring accuracy height.
A kind of liquid density measurement method, be specially: be set up in parallel two U type pipes, fill testing liquid to a U type pipe, fill normal fluid to the 2nd U type pipe, testing liquid equates with the height of normal fluid, applies identical pressure simultaneously in two U type pipes, and it is poor to adopt camera to read two U type pipe liquid level pixels, with liquid level pixel differential conversion is that the liquid level true altitude is poor, according to this liquid level true altitude difference and normal fluid density calculation testing liquid density.
A kind of liquid density measurement device, comprise the first U-shaped pipe 1, the second U-shaped pipe 2, three-way pipe 3, operation valve 4, rubber ball 5, camera 6 and processor, two U-shaped pipes are placed side by side, one port of two U-shaped pipes is communicated with atmosphere, the another port is interconnected by three-way pipe 3, three-way pipe 3 also joins by operation valve 4 and rubber ball 5, and other has camera 6 to aim at the port that the first U-shaped pipes 1 and the second U-shaped pipe 2 are connected to three-way pipe, camera 6 connection processing devices.
As improvement of the present invention, the reference graduation line is carved with in the port that described first U-shaped pipe 1 or the 2nd U type pipe 2 connect three-way pipe.
As a further improvement on the present invention, described processor also joins with display.
Technique effect of the present invention is embodied in:
(1) camera is aimed at the end that two U-shaped pipes are connected to three-way pipe, and computing machine links to each other with camera by image pick-up card.Utilize the liquid level image of two U-shaped pipes of camera collection, show on computers in real time by image pick-up card.In advance definite camera inside and outside parameter is gone forward side by side rower calmly, obtains the relation between true altitude and the demonstration height.After liquid level reaches the requirement height, computing machine is by showing height and demarcating good true altitude in advance and the relation between the height that shows obtains the value of true altitude, utilize again under the logical pressure difference between different liquids density and the height conversion relation obtain two kinds of density of liquid relations.Obtain unknown density density of liquid by known density of liquid at last.
(2) the present invention is practical, utilizes software, calculates by computer-internal, can directly unknown density density of liquid be shown on computers, realizes promptly surveying promptly reading, or by voice broadcast, directly hears the numerical value of density fast.In computing machine, the database of various fluid densities is arranged, can also pass through accessing database, may supply operating personnel's reference on computers for the information demonstration of which kind of liquid with measuring liquid.The present invention also can measure the purity of various liquid, as the oil and the true and false purity of wine etc.
(3) implementation of the present invention is simple, only utilized the fluid column equilibrium principle, realize that by three-way pipe the liquid level pressure difference is consistent, avoided for density greater than water and the trouble that will measure with different densitometers less than the liquid of water, and adopt camera to realize the measurement of liquid level, the metrical information that can obtain enriching improves measuring accuracy and efficiency of measurement, and makes that whole measuring process is more reliable.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is two a U-shaped pipe liquid level differentials intention, and Fig. 2 (a) is that Fig. 2 (b) is the difference in height synoptic diagram when testing liquid liquid level overgauge liquid levels height at the difference in height synoptic diagram of testing liquid liquid level during less than the normal fluid liquid level;
Fig. 3 is a camera collection image synoptic diagram, and Fig. 3 (a) is the corresponding image synoptic diagram of Fig. 2 (a), and Fig. 3 (b) is the corresponding image synoptic diagram of Fig. 2 (b).
Embodiment
Device of the present invention and realization principle are:
As shown in Figure 1, the first U-shaped pipe 1 all communicates with atmosphere with the left port of the second U-shaped pipe 2, and right output port connects by three-way pipe 3 after adding rubber stopper.Be carved with a scale mark on the first U-shaped pipe 1, as the standard liquid level.The first U-shaped pipe 1 and the second U-shaped pipe 2 are placed side by side.Three-way pipe 3 other ends connect rubber ball 5 by operation valve 4.Camera 6 adopts camera, and camera is aimed at the right-hand member place of the first U-shaped pipe 1 and the second U-shaped pipe 2, and computing machine 8 links to each other with camera by image pick-up card 7.
During work, testing liquid is filled with the first U-shaped pipe 1, normal fluid (as water) is filled with the second U-shaped pipe 2.When the first U-shaped pipe 1 and the second U-shaped pipe 2 charge into air, three-way pipe 3 can keep the first U-shaped pipe 1 identical all the time with the atmospheric pressure of the second U-shaped pipe, 2 right-hand member liquid levels, promptly keeps the first U-shaped pipe 1 identical with the pressure difference of the second U-shaped pipe, 2 two ends liquid levels.Shown in Fig. 2 (a), 2 (b), establishing the first U-shaped pipe, 1 interior fluid density is ρ
Survey, corresponding right-hand member liquid level is h
Mark, fluid density is ρ in the second U-shaped pipe 2
Mark, corresponding right-hand member liquid level is h
1, the first U-shaped pipe 1 and the second U-shaped pipe, 2 right-hand member liquid level differences are h, then h
1=h
Mark± h is in the corresponding formula of Fig. 2 (a) "+", in the corresponding formula of Fig. 2 (b) "-".According to ρ
Markh
1=ρ
Surveyh
Mark, i.e. ρ
Mark(h
Mark± h)=ρ
Surveyh
Mark, obtain ρ
Survey=ρ
Mark(1 ± h/h
Mark).At known h
MarkAnd ρ
MarkSituation under, reach h if read liquid level to be measured
MarkThe time the h value, can measure the density of testing liquid.
As shown in Figure 1, the right-hand member of the camera perpendicular alignmnet first U-shaped pipe 1 and the second U-shaped pipe 2, image pick-up card 7 are gathered liquid level to be measured and are reached h
MarkThe time the first U-shaped pipe 1 and the second U-shaped pipe, 2 right-hand member liquid levels image, and be transferred to computing machine 8.Computing machine 8 obtains the first U-shaped pipe 1 and the second U-shaped pipe, 2 right-hand member liquid level difference h at this moment according to the calibrating parameters of camera.Shown in Fig. 3 (a), 3 (b), the resolution of establishing camera is δ, and liquid level to be measured reaches h
MarkThe time, the pixel count in the image of camera collection between the first U-shaped pipe 1 and the second U-shaped pipe, 2 right-hand member liquid levels is x, then this moment h=δ x, thereby ρ
Survey=ρ
Mark(1 ± δ x/h
Mark), can calculate the density of testing liquid when promptly reading x.
Concrete measuring process is as follows:
By the device of putting up shown in Figure 1, and fill with testing liquid, fill with normal fluid to U-shaped pipe 2 to U-shaped pipe 1.
Open the valve above the rubber ball,, treat to stop when testing liquid is about to rise to master scale inflation to U-shaped pipe 1 and 2 inflations of U-shaped pipe.
Open camera, and image is transferred to computing machine 8 by image pick-up card 7.
U-shaped pipe 1 and U-shaped pipe 2 right-hand member liquid level difference x when reading the t liquid level stabilizing.
By ρ
Survey=ρ
Mark(1 ± δ x/h
Mark), can measure the density of testing liquid.
Embodiment is carved with the reference graduation line at the right-hand member place of the first U-shaped pipe 1, rubber ball is inflated to when liquid level to be measured arrives the reference graduation line and stops, therefore the difference in height pixel count that only need read liquid level to be measured and standard liquid level when density calculation gets final product, the present invention does not limit to this a kind of implementation, also can carve the reference graduation line at the right-hand member place of the second U-shaped pipe, perhaps do not want scale mark, the density calculation method of corresponding change computing machine gets final product.No matter any implementation is all in protection scope of the present invention.
Claims (4)
1, a kind of liquid density measurement method, be specially: be set up in parallel two U type pipes, fill testing liquid to a U type pipe, fill normal fluid to the 2nd U type pipe, testing liquid equates with the height of normal fluid, applies identical pressure simultaneously in two U type pipes, and it is poor to adopt camera to read two U type pipe liquid level pixels, with liquid level pixel differential conversion is that the liquid level true altitude is poor, according to this liquid level true altitude difference and normal fluid density calculation testing liquid density.
2, a kind of liquid density measurement device of realizing the described method of claim 1, comprise the first U-shaped pipe (1), the second U-shaped pipe (2), three-way pipe (3), operation valve (4), rubber ball (5), camera (6) and processor, two U-shaped pipes are placed side by side, one port of two U-shaped pipes is communicated with atmosphere, the another port is interconnected by three-way pipe (3), three-way pipe (3) also joins by operation valve (4) and rubber ball (5), other has camera (6) to aim at the port that the first U-shaped pipe (1) and the second U-shaped pipe (2) are connected to three-way pipe, camera (6) connection processing device.
3, liquid density measurement device according to claim 2 is characterized in that, the reference graduation line is carved with in the port that described first U-shaped pipe (1) or the 2nd U type pipe (2) connect three-way pipe.
4, liquid density measurement device according to claim 2 is characterized in that, described processor also joins with display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100613211A CN101520395B (en) | 2009-03-27 | 2009-03-27 | Method and device for liquid density measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100613211A CN101520395B (en) | 2009-03-27 | 2009-03-27 | Method and device for liquid density measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101520395A true CN101520395A (en) | 2009-09-02 |
| CN101520395B CN101520395B (en) | 2011-01-19 |
Family
ID=41081103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100613211A Expired - Fee Related CN101520395B (en) | 2009-03-27 | 2009-03-27 | Method and device for liquid density measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101520395B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521279A (en) * | 2013-11-01 | 2014-01-22 | 苏州市凯业金属制品有限公司 | Three pipes for teaching laboratory |
| CN104596888A (en) * | 2015-02-11 | 2015-05-06 | 中国工程物理研究院总体工程研究所 | Temperature-control liquid density measuring device |
| CN109974798A (en) * | 2019-04-03 | 2019-07-05 | 阳泉煤业（集团）有限责任公司 | A kind of gas pressure-flow testing device |
| CN112051188A (en) * | 2020-09-18 | 2020-12-08 | 华兰生物工程重庆有限公司 | Density measuring equipment and method for measuring protein content based on same by density method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB609445A (en) * | 1946-03-14 | 1948-09-30 | Manchester Oil Refinery Ltd | Improvements in density meters for liquids |
| CA1112471A (en) * | 1979-11-29 | 1981-11-17 | Frank Rosenblum | Liquid density meter |
| SU1179149A1 (en) * | 1984-01-24 | 1985-09-15 | Томский инженерно-строительный институт | Device for measuring liquid density |
| CN2345976Y (en) * | 1998-07-10 | 1999-10-27 | 陈富忠 | Liquefied petroleum gas liquid densimeter |
| CN2646696Y (en) * | 2003-10-17 | 2004-10-06 | 郑吉鹏 | A liquid density measuring apparatus |
-
2009
- 2009-03-27 CN CN2009100613211A patent/CN101520395B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521279A (en) * | 2013-11-01 | 2014-01-22 | 苏州市凯业金属制品有限公司 | Three pipes for teaching laboratory |
| CN104596888A (en) * | 2015-02-11 | 2015-05-06 | 中国工程物理研究院总体工程研究所 | Temperature-control liquid density measuring device |
| CN109974798A (en) * | 2019-04-03 | 2019-07-05 | 阳泉煤业（集团）有限责任公司 | A kind of gas pressure-flow testing device |
| CN112051188A (en) * | 2020-09-18 | 2020-12-08 | 华兰生物工程重庆有限公司 | Density measuring equipment and method for measuring protein content based on same by density method |
| CN112051188B (en) * | 2020-09-18 | 2024-06-25 | 华兰生物工程重庆有限公司 | Density measuring equipment and method for measuring protein content by using density method based on same |
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| Publication number | Publication date |
|---|---|
| CN101520395B (en) | 2011-01-19 |
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