CN103528748A - Muddy water pressure measuring device - Google Patents
Muddy water pressure measuring device Download PDFInfo
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- CN103528748A CN103528748A CN201310499424.2A CN201310499424A CN103528748A CN 103528748 A CN103528748 A CN 103528748A CN 201310499424 A CN201310499424 A CN 201310499424A CN 103528748 A CN103528748 A CN 103528748A
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Abstract
The invention relates to a muddy water pressure measuring device, and belongs to the technical field of water conservancy measurement. The device mainly comprises a pressure measurement container, a pressure measurement probe, a hose, a pressure measurement pipe, a pressure measurement plate, a camera and a computer, wherein the pressure measurement container is used for accommodating to-be-measured muddy water; a pressure measurement hole is formed in the side wall of the pressure measurement container, and the pressure measurement probe is mounted in the pressure measurement hole; two ends of the hose are connected with the probe and the pressure measurement pipe respectively to form a communication pipeline used for accommodating clear water, and the clear water and the muddy water are isolated by a film in the pressure measurement probe; the pressure measurement pipe is perpendicularly fixed on the surface of the vertically mounted pressure measurement plate, and a chessboard pattern calibrating plate is attached to the surface of the pressure measurement plate; the camera is aligned to the liquid level of the clear water in the pressure measurement pipe and connected with the computer; the camera shoots the liquid level of the clear water in the pressure measurement pipe and returns an image to the computer in real time; and the computer calculates the pressure of the to-be-measured muddy water according to the height of the liquid level. The device can measure the pressure of muddy water in a high-accuracy, high-frequency and automatic manner, and the comprehensive measurement accuracy is higher than that of conventional pressure measurement equipment.
Description
Technical field
The invention belongs to water conservancy measurement technology field, particularly a kind of new equipment of measuring muddy water pressure.
Background technology
Pressure is that water body acts on the water pressure in unit area, is to describe one of the most basic characteristic variable of water movement.In engineering practice and scientific experiment field, pressure mainly obtains by two kinds of methods of theoretical calculate and measurement, and wherein, theoretical calculating is only applicable to static homogeneous water body, and the pressure in motion or heterogeneous body water body can only obtain by measuring method.
Piezometric tube is the pressure tester that hydraulic model test field is most widely used, it is water body density to be measured that this device be take formula p=ρ gh(ρ, g is acceleration of gravity, h is the tested point depth of water) be theoretical foundation, by the water level reading in the piezometric tube being connected with tested point, measure hydraulic pressure, there is the plurality of advantages such as simple, easy-to-use.But, being subject to the restriction of theoretical foundation, piezometric tube is only applicable to the pressure of the water body that density measurement is even and known; Meanwhile, because the water level in piezometric tube is conventionally by manually reading and record, there is the shortcomings such as measuring accuracy and survey frequency are low.
In recent years, fast development along with semiconductor and micro-electromechanical technology, semiconductor pressure sensor is used widely at numerous areas, this sensor be take piezoelectric effect as basis, the pressure that deformation element can be born is with the formal output of analog or digital signal, has that volume is little, precision is high, automaticity advantages of higher.At present, the synthesis precision of pressure transducer can reach 2 ‰ of full scale, can meet the demand of great majority application.But for some wide range, high-precision applications, existing pressure transducer still cannot satisfy the demands.For example, when the working pressure sensor measurement depth of water is the water body pressure of 1m magnitude, its precision is 10Pa magnitude and continues to reduce with the increase of the depth of water.On the other hand, when pressure sensor application is when muddy water is measured, the also as easy as rolling off a log obstruction that is subject to sand grain and malfunctioning of sensor probe position.For high precision, measure for a long time, pressure transducer time float and problem that temperature is floated is also difficult to solve.
Summary of the invention
The object of the invention is the practical application request for the pressure measurement of heterogeneous body muddy water high precision, propose a kind of measurement mechanism of measuring muddy water pressure, can realize high precision, high frequency, automatically measure muddy water pressure, integrated measurement accuracy is higher than existing pressure instrumentataion.
A kind of muddy water pressure measurer that the present invention proposes, is characterized in that, this device is mainly comprised of pressure measurement container, pressure measurement probe, flexible pipe, piezometric tube, pressure measurement plate, camera, computing machine; Wherein, pressure measurement container is used for holding muddy water to be measured, and described pressure measurement container side wall is provided with pressure tap, and described pressure measurement probe is arranged in pressure tap; Described flexible pipe two ends are connected with piezometric tube with probe respectively, are configured for holding the connecting pipeline of clear water, and clear, muddy water is isolated by the pressure measurement inner film of popping one's head in; Piezometric tube is vertically fixed on the surface of the pressure measurement plate of vertical installation, and gridiron pattern scaling board is posted on pressure measurement plate surface; Clear water liquid level in camera alignment piezometric tube is also connected with computing machine; Clear water liquid level in camera piezometric tube is also passed picture back computing machine in real time; Computing machine utilizes conventional digital image processing method from picture, to extract clear water liquid level, and according to liquid level, calculates the pressure of muddy water to be measured.
Feature of the present invention and effect are:
(1) utilize divided thin film that pliability is fabulous every clear water and muddy water, realized by measuring clear water water level and change procedure thereof and calculated muddy water pressure and temporal evolution process thereof; Because barrier film is arranged on pressure measurement internal tank, avoided the pressure measurement tower head blockage problem that in muddy water, sediment settlement causes.
(2) utilize high-resolution camera record and identification clear water liquid level, can accurately catch the SEA LEVEL VARIATION of 0.01mm magnitude, thus the high resolving power of realization (0.1Pa) pressure measurement.
Accompanying drawing explanation
Fig. 1 is muddy water device for pressure measurement schematic diagram of the present invention;
Fig. 2 is pressure measurement probe embodiments structural representation of the present invention, and wherein Fig. 2 (a) is side sectional view, and Fig. 2 (b) is front elevation.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
A kind of high precision muddy water pressure measurer of the present invention, as shown in Figure 1, is mainly comprised of pressure measurement container 1, pressure measurement probe 2, flexible pipe 3, piezometric tube 4, pressure measurement plate 5, camera 6, computing machine 7.Wherein, pressure measurement container 1 is for holding muddy water 8 to be measured, and pressure measurement container 1 sidewall is provided with pressure tap, and described pressure measurement probe 2 is arranged in pressure tap; Flexible pipe 3 two ends are connected with piezometric tube 4 with pressure measurement probe 2 respectively, are configured for holding the connecting pipeline of clear water 9, clearly, muddy water isolated by the pop one's head in film 21 of 2 inside of pressure measurement; Piezometric tube 4 is vertically fixed on the surface of the pressure measurement plate 5 of vertical installation, and gridiron pattern (the present embodiment adopts the standard gridiron pattern of 5 * 5mm) scaling board 11 is posted on pressure measurement plate 5 surfaces; Camera 6 is aimed at the clear water liquid level in piezometric tube 4 and is connected with computing machine 7; Camera 6 is taken the clear water liquid level in piezometric tube 4 and passes in real time picture back computing machine 7; Computing machine 7 utilizes conventional digital image processing method from picture, to extract clear water liquid level, and according to liquid level, calculates the pressure of muddy water to be measured.
The length of the pressure measurement container 1 of the present embodiment is the square-section container of 50cm, 50cm, 100cm respectively, and container side wall is provided with the horizontal rectangular pressure tap 10 of long 22cm, wide 3cm; Flexible pipe 3 is internal diameter 6mm common plastics flexible pipe; Piezometric tube 4 is the clear glass pipe of internal diameter 6mm, external diameter 8mm; Pressure measurement plate 5 is the black aluminium sheet of long 30cm, wide 15cm, thick 5mm; Camera 6 is Nikon D800E camera, and resolution 7360 * 4912 pixels, install circle bubble 12 on camera; This photograph function is caught the level changing amplitude of 0.01mm, take and guarantees that pressure measurement precision is as 0.1Pa.
The computing machine 7 of the present embodiment is common desk-top computer.
Probe 2 of the present invention is mainly comprised of mainboard 21, pressing plate 22, film 23, protection network 24 and joint 25, as shown in Figure 2 (a) shows.Wherein, mainboard 21 is plain metal plate, and Qiang26，Fang chamber, a side milling side bottom centre of plate bores circular hole 27 and connects mainboard, and circular hole 27 is connected with joint 25, and joint 25 is for connecting hose 3; The open end in film 23 chambeies, the side of covering 26, and being pressed abd fixed on mainboard 21 by pressing plate 22, film 23 has larger slack, can be under effect of water pressure in square chamber 26 Free Transform, transmit the pressure of film both sides, the pressure of its both sides is equated; Protection network 24 is arranged on film 23 by muddy water one side, to prevent film 23 chambeies, the side of exposing 26.The aluminium sheet that the mainboard 21 of the present embodiment is long 22cm, wide 3cm, thick 1cm, the square long 20cm in chamber 26, wide 1cm, dark 0.8cm, circular hole 27 diameter 6mm; Joint 27 is the thin-wall steel tube of long 5cm, internal diameter 6mm; The poly tetrafluoroethylene that film 23 is thick 0.01mm; The steel plate that pressing plate 22 is thick 1mm; Protection network 24 is the stainless steel mesh of string diameter 0.4mm, aperture 2mm, as shown in Fig. 2 (b).
Based on above-mentioned ingredient, the implementation process that the present invention measures muddy water pressure is:
(1) in the pressure measurement probe 2 rectangle pressure taps 11 that are arranged on pressure measurement container 1 sidewall, hold the clear water equating with the muddy water depth of water to be measured in pressure measurement container 1, film 23 is close to the bottom in chamber, probe side 26 under the effect of water pressure; To by fresh water pouring in piezometric tube 4, flexible pipe 3 and 2 connecting pipelines that form of popping one's head in, until the volume of film both sides water half of chamber, the side of accounting for respectively, film both sides pressure equates, the liquid level of pressure measurement container 1 and piezometric tube 4 is contour.Adjust the position of camera 6, make the liquid level in piezometric tube 4 roughly be positioned at middle part, image base, leveling fixed camera 6.
(2) after camera 6 shape libraries, take pictures, utilize conventional digital image processing method to extract liquid level in piezometric tube 4 coordinate in image, because the liquid level in piezometric tube 4 equals the liquid level in pressure measurement container 1, can set up the relation of muddy water liquid level and image coordinate initial point; Utilize conventional corner recognition method to identify angle point from gridiron pattern scaling board 11, and calculate adjacent corner points pixel distance, obtain the reduction coefficient between pixel dimension and physical size.
(3) clear water in pressure measurement container 1 is replaced with to the muddy water to be measured 8 of same volume, because muddy water unit weight is greater than clear water unit weight, film 23 is out of shape to clear water side under the effect of muddy water pressure.After muddy water liquid level build-up calmness, to by fresh water pouring in piezometric tube 4, flexible pipe 3 and 2 connecting pipelines that form of popping one's head in, lifting along with the interior clear water liquid level of piezometric tube 4, clear water pressure is greater than muddy water pressure gradually, film 23 is because pressure reduction is out of shape to muddy water side, liquid level in piezometric tube 4 falls after rise again to film both sides pressure again equal gradually, and a half that accounts for its volume when the interior clear water in square chamber 26 stops fresh water pouring.
(4) camera 6 is taken pictures again.Utilize conventional digital image processing method to extract the image coordinate of the clear water liquid level in piezometric tube 4, according to the reduction coefficient between the relation of known muddy water liquid level and image coordinate initial point and pixel dimension and physical size, obtain clear water liquid level in piezometric tube 4 and the difference of elevation of the interior muddy water liquid level of pressure measurement container 1, calculate muddy water pressure.As time goes on, the muddy water pressure in pressure measurement container 1 changes the sedimentation due to silt, causes the clear water liquid level in piezometric tube 4 to change, by extract liquid level over time process can obtain muddy water pressure temporal evolution process.
Known according to above-mentioned implementation process, the surveying range of pressure tester of the present invention is determined jointly by the volume of rectangle pressure tap 11 and the internal diameter of piezometric tube 4.Take the present embodiment as example, and the volume of rectangle pressure tap 11 is 16000mm
3, this equals the water column of high 56cm in measuring tube 4; Therefore, the difference of the measurable highest pressure of the present embodiment and minimum pressure is 5600Pa.On the other hand, measuring accuracy of the present invention is determined by the shooting resolution of camera 6.Take the present embodiment as example, during the physical size of the corresponding 49mm of picture altitude (4912 pixel) taking when camera, take resolution while being 0.01mm/ pixel, corresponding pressure measurement resolution is 0.1Pa.
Claims (3)
1. a muddy water pressure measurer, is characterized in that, this device is mainly comprised of pressure measurement container, pressure measurement probe, flexible pipe, piezometric tube, pressure measurement plate, camera, computing machine; Wherein, pressure measurement container is used for holding muddy water to be measured, and described pressure measurement container side wall is provided with pressure tap, and described pressure measurement probe is arranged in pressure tap; Described flexible pipe two ends are connected with piezometric tube with probe respectively, are configured for holding the connecting pipeline of clear water, and clear, muddy water is isolated by the pressure measurement inner film of popping one's head in; Piezometric tube is vertically fixed on the surface of the pressure measurement plate of vertical installation, and gridiron pattern scaling board is posted on pressure measurement plate surface; Clear water liquid level in camera alignment piezometric tube is also connected with computing machine; Clear water liquid level in camera piezometric tube is also passed picture back computing machine in real time; Computing machine utilizes conventional digital image processing method from picture, to extract clear water liquid level, and according to liquid level, calculates the pressure of muddy water to be measured.
2. install as claimed in claim 1, it is characterized in that, described pressure measurement probe is mainly comprised of mainboard, pressing plate, film, protection network and joint; Wherein, a side of mainboard has Fang Qiang，Fang chamber bottom centre and has the circular hole that connects mainboard, and circular hole is connected with joint, and joint is for connecting hose; The open end in chamber, the film side of covering, and being pressed abd fixed on mainboard by pressing plate, film can be under effect of water pressure in square chamber Free Transform, transmit the pressure of film both sides, the pressure of its both sides is equated; Protection network is arranged on film by muddy water one side, to prevent chamber, the film side of exposing.
3. install as claimed in claim 1, it is characterized in that, resolution 7360 * 4912 pixels of described camera, install circle bubble on camera; This camera can be caught the level changing amplitude of 0.01mm, take and guarantees that pressure measurement precision is as 0.1Pa.
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| CN201310499424.2A CN103528748B (en) | 2013-10-22 | 2013-10-22 | Muddy water pressure measuring device |
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| CN201310499424.2A CN103528748B (en) | 2013-10-22 | 2013-10-22 | Muddy water pressure measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107105565A (en) * | 2017-05-02 | 2017-08-29 | 西北工业大学 | A kind of slight pressure traverse measuring device and measuring method for plasma flow control |
| CN112862820A (en) * | 2021-03-17 | 2021-05-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Intelligent acquisition device for water depth of piezometer tube group based on image recognition technology and water depth acquisition method thereof |
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| CN2762757Y (en) * | 2004-12-29 | 2006-03-08 | 彭绍与 | Luminous display of sphygmonanometer |
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| CN102393193A (en) * | 2011-10-12 | 2012-03-28 | 清华大学 | High frequency image acquisition system for measuring flow rate |
| CN102519628A (en) * | 2011-12-16 | 2012-06-27 | 清华大学 | Coupling measurement device of particle three-dimensional stress and two-dimensional fluid velocity field |
| CN102586573A (en) * | 2012-01-18 | 2012-07-18 | 中冶南方(武汉)威仕工业炉有限公司 | Leakage detecting overvoltage protective device suitable for body of annealing furnace |
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2013
- 2013-10-22 CN CN201310499424.2A patent/CN103528748B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001108548A (en) * | 1999-10-12 | 2001-04-20 | Furukawa Electric Co Ltd:The | Pressure measuring device |
| CN2762757Y (en) * | 2004-12-29 | 2006-03-08 | 彭绍与 | Luminous display of sphygmonanometer |
| CN201477636U (en) * | 2009-08-26 | 2010-05-19 | 北京农业信息技术研究中心 | Image collecting device based on vertical position difference |
| CN102393193A (en) * | 2011-10-12 | 2012-03-28 | 清华大学 | High frequency image acquisition system for measuring flow rate |
| CN102519628A (en) * | 2011-12-16 | 2012-06-27 | 清华大学 | Coupling measurement device of particle three-dimensional stress and two-dimensional fluid velocity field |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107105565A (en) * | 2017-05-02 | 2017-08-29 | 西北工业大学 | A kind of slight pressure traverse measuring device and measuring method for plasma flow control |
| CN112862820A (en) * | 2021-03-17 | 2021-05-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Intelligent acquisition device for water depth of piezometer tube group based on image recognition technology and water depth acquisition method thereof |
| CN112862820B (en) * | 2021-03-17 | 2023-12-29 | 水利部交通运输部国家能源局南京水利科学研究院 | Image recognition technology-based intelligent acquisition device and method for water depth of manometric tube group |
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