CN104614046A - Oil-water interface position measuring method based on CCD - Google Patents
Oil-water interface position measuring method based on CCD Download PDFInfo
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- CN104614046A CN104614046A CN201510070196.6A CN201510070196A CN104614046A CN 104614046 A CN104614046 A CN 104614046A CN 201510070196 A CN201510070196 A CN 201510070196A CN 104614046 A CN104614046 A CN 104614046A
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Abstract
The invention belongs to the field of industrial measurement, discloses an oil-water interface position measuring method based a CCD, and particularly relates to oil-water interface position measurement. The method comprises the steps that 1, an LED lamp set and the linear array CCD are loaded into a sealed tube to be inserted into the proper position in liquid; 2, the LED lamp set and the linear array CCD are powered on, and the linear array CCD receives transmission light, passing through the liquid, of LED lamps; 3, the linear array CCD sends light intensity data to a computer; 4, the computer analyzes the light intensity data and judges the position of an oil-water interface. According to the fourth step of analyzing and judging the position of the oil-water interface, points with the minimum light intensity value are obtained, the trough range of the points with the minimum light intensity value is determined, and the position of the oil-water interface and the position of an oil-air interface are determined within the trough range. The method has the advantages of being high in measurement precision, high in processing speed and the like.
Description
Technical field
The invention belongs to field of industrial measurement, relate to a kind of oil-water interface position measuring method, particularly based on the oil-water interface position measuring method of CCD.
Background technology
Liquid surface detects, and particularly water-oil interface detect, and have a wide range of applications in fields such as petrochemical complex, chemical, wastewater treatments.The water-oil interface that existing detection method achieves various ways by technology such as electronics, ultrasound wave, Fibre Optical Sensors are measured, measuring accuracy and measurement ageing etc. in comparatively classic method had rapid progress, but they still have respective deficiency.Capacitance Oil vs Water Boundary Detecting detection method inserts metal tube as electrode in canister, canister and metal tube add that middle liquid forms a capacitor, but can cause corrosion to metal tube when the humidity in container is higher, long-time use can affect measuring accuracy.Ultrasonic type water-oil interface detection method, utilize the difference of sound wave velocity of propagation in different medium, measure the mistiming of ultrasonic probe reception needed for ultrasonic reflection signal, can oil-water interface position be calculated, but comparatively big error can be brought into measurement when liquid contains more impurity.In addition, existing method can only measure the equivalent position of liquid surface, can not get accurate result.
Summary of the invention
The present invention seeks to the deficiency overcoming existing oil-water interface position measuring method, provide a kind of oil-water interface position measuring method based on CCD, the light intensity data particularly detected by line array CCD judges the method for the position of water-oil interface.
Technical scheme of the present invention is:
Based on the oil-water interface position measuring method of CCD, comprise the following steps:
1st step: LED group, line array CCD are loaded in sealed tube, inserts correct position in liquid;
2nd step: to LED group, line array CCD energising, line array CCD receives the transmitted light of LED through liquid;
3rd step: light intensity data is sent to computing machine by line array CCD;
4th step: computing machine is analyzed light intensity data, judges the position of water-oil interface.
Sealed tube described in step 1 is glass material, and light transmission is good, places perpendicular to liquid level; LED group and line array CCD are loaded in two sealed tubes respectively, and two sealed tubes are linked together by rigid connector, ensure that the spacing of LED group and line array CCD is constant.Correct position described in step 1 be water-oil interface and oil/Air Interface all at line array CCD effective measuring area, namely core intersection is no more than LED group height and the effective measuring height of line array CCD.Line array CCD described in step 1 has 3648 pixels, and pixel sequence number 1 is highly minimum, and 3648 pixel height are the highest.
Transmitted light described in step 2, is sent by LED group, through oil reservoir or water layer, because the difference of oil, water light transmission, makes transmitted light light intensity different.
Oil-water interface position described in step 4 judges there are following 3 steps:
A, obtain the minimum point of light intensity value;
B, the trough scope determining residing for light intensity minimum point;
C, within the scope of trough, determine water-oil interface and oil/Air Interface position.
Described step b is from light intensity minimum point, find out two intensity maxima points in neighbouring pixel, one of them pixel sequence number is greater than the pixel sequence number of light intensity smallest point, and it is minimum with light intensity minimum point pixel sequence number difference, another pixel sequence number is less than the pixel sequence number of light intensity minimum point, and minimum with the pixel sequence number difference of light intensity minimum point.Scope between two intensity maxima points is trough scope, includes light intensity minimum point.Valley regions pixel sequence number being less than light intensity minimum point pixel sequence number is set to trough left field, and the valley regions that pixel sequence number is greater than light intensity minimum point pixel sequence number is set to trough right side area.
Described step c finds out the position of profit, oil/Air Interface respectively in trough left and right side region.Due to different medium light transmission difference, cause light intensity acute variation, therefore trough left and right side light intensity changes maximum point and is profit, oil/Air Interface.
Advantage of the present invention and beneficial effect
Structure of the present invention is simple, easy to use, is suitable for oil-water interface position and detects, and particularly constantly the change water-oil interface of occasion of core intersection detect.Use computing machine to judge oil reservoir interface location by oil-water interface position measuring method, measuring process is without the need to artificial reading.Use isolated tube measurement mechanism and liquid to be separated, be applicable to the inflammable and explosive measurement waiting dangerous situation.
Accompanying drawing explanation
Fig. 1 is workflow block diagram of the present invention.
Fig. 2 is the light intensity curve example that line array CCD collects, and horizontal ordinate is line array CCD pixel position, and ordinate is normalization light intensity value.
In figure: 1, maximum point on the left of trough; 2, oil-water interface position; 3, light intensity minimum point; 4, oil/Air Interface position; 5, maximum point on the right side of trough.
Fig. 3 is oil-water interface position determination methods process flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the technology of the present invention is described in detail.Based on an oil-water interface position measuring method of CCD, comprise the following steps:
1st step: LED group, line array CCD are loaded in sealed tube, inserts correct position in liquid;
2nd step: to LED group, line array CCD energising, line array CCD receives the transmitted light of LED through liquid;
3rd step: light intensity data is sent to computing machine by line array CCD;
4th step: computing machine is analyzed light intensity data, judges the position of water-oil interface.
Workflow of the present invention as shown in Figure 1, LED group sends scattered light, through measured object (oil reservoir and water layer), line array CCD receives the transmitted light of different liquid level, light signal is converted to electric signal transmission to computing machine, computing machine, to data analysis, judges position and the core intersection of water-oil interface.
Computer Analysis described in step 4, determination methods are divided into following 3 steps:
A, obtain the minimum point of light intensity value;
B, the trough scope determining residing for light intensity minimum point;
C, within the scope of trough, determine water-oil interface and oil/Air Interface position.
As light intensity curve example in Fig. 2, existing by Computer Analysis, determination methods, details are as follows:
Regulation line array CCD placement direction is that vertical fluid level is placed, namely pixel sequence number 0 is highly minimum, edge and liquid level vertical direction upwards pixel position increase, in this example, light intensity minimum point 3 position is 1658, with this point for benchmark, on the left of curve, find intensity maxima point 1, between minimum point 3 and maximum point 1, then find the position 2 of water-oil interface; If CCD point pixel sequence number is A, (A-1) point is that pixel sequence number is less than A by 1, then A point light intensity changing value:
A point light intensity changing value=A point light intensity value-(A-1) puts light intensity value
Relatively between intensity maxima point 1 and light intensity minimum point 3 in region light intensity changing value a little, the maximum point of light intensity changing value is oil-water interface position 2; Determine the position 4 of oil/Air Interface with same process, then can obtain the thickness of oil reservoir; Then core intersection is:
Core intersection value=(putting a 4 pixel sequence numbers-2 pixel sequence number)/pixel sum * CCD actual physics length
In this example, pixel adds up to 3648, and CCD actual physics length is 29.78mm, and putting 2 pixel sequence numbers is 1386, and putting 4 pixel sequence numbers is 2248, then core intersection value is: 7.04mm; With CCD pixel peak, namely 3648 is benchmark, is just higher than reference point, then oil/Air Interface position is-11.43mm, and oil-water interface position is-18.47mm.
Claims (3)
1., based on an oil reservoir interface location measuring method of CCD, it is characterized in that the step of the method comprises:
1st step: LED group, line array CCD are loaded in sealed tube, inserts correct position in liquid;
2nd step: to LED group, line array CCD energising, line array CCD receives the transmitted light of LED through liquid;
3rd step: light intensity data is sent to computing machine by line array CCD;
4th step: computing machine is analyzed light intensity data, judges the position of water-oil interface.
2. method according to claim 1, is characterized in that LED group and line array CCD are in sealed tube, and sealed tube is glass material, and light transmission is good, measurement mechanism and fluid isolation.
3. method according to claim 1, is characterized in that described in the 4th step, oil-water interface position is drawn by following steps:
A, obtain the minimum point of light intensity value;
B, the trough scope determining residing for light intensity minimum point;
C, within the scope of trough, determine water-oil interface and oil/Air Interface position.
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| CN201510070196.6A CN104614046A (en) | 2015-02-11 | 2015-02-11 | Oil-water interface position measuring method based on CCD |
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| CN201510070196.6A CN104614046A (en) | 2015-02-11 | 2015-02-11 | Oil-water interface position measuring method based on CCD |
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| CN105241523A (en) * | 2015-11-04 | 2016-01-13 | 成都南方电子仪表有限公司 | Radioactive waste resin interface measurement device and measurement method thereof |
| CN106840312A (en) * | 2017-01-10 | 2017-06-13 | 陕西科技大学 | A kind of crude oil storage tank water liquid level measurement mechanism for oil and method |
| CN110361073A (en) * | 2018-03-26 | 2019-10-22 | 华中科技大学 | A kind of liquid-level detecting method based on liquid waveguide |
| CN113405628A (en) * | 2021-06-22 | 2021-09-17 | 北京理工大学 | Liquid level deformation and morphology measurement method and system based on double-layer graph transmission imaging |
| CN113617542A (en) * | 2021-07-28 | 2021-11-09 | 上海乐纯生物技术有限公司 | Centrifugal device for separating and preparing biological samples |
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| CN113617542A (en) * | 2021-07-28 | 2021-11-09 | 上海乐纯生物技术有限公司 | Centrifugal device for separating and preparing biological samples |
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