CN101387538B - Linear array CCD transmission type liquid level measuring device - Google Patents
Linear array CCD transmission type liquid level measuring device Download PDFInfo
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- CN101387538B CN101387538B CN2008101374088A CN200810137408A CN101387538B CN 101387538 B CN101387538 B CN 101387538B CN 2008101374088 A CN2008101374088 A CN 2008101374088A CN 200810137408 A CN200810137408 A CN 200810137408A CN 101387538 B CN101387538 B CN 101387538B
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Abstract
The invention discloses a transmission-type liquid level measuring method based on a linear array CCD and a measuring device. The method adopts infiltration effect and other border effects of objects, forms a transmissive relation with the linear array CCD through a point light source, and obtains output values with different pixel strengths of CCD; and the values can directly reflect the characteristics of the liquid level, and if the data are subjected to further processing, high-precision liquid level measured values can be obtained. The method is an optical liquid level measuring method without an optical imaging lens, has the advantages of little influence on precision caused by temperature and concentration change of liquid, relatively simple structure, easy placement, capability of working in corrosive and other severe industrial environments and so on; and non-contact measurement can be realized if a receiving device is placed on the outside of a transparent container.
Description
(1) technical field
What the present invention relates to is a kind of level measuring method and device, specifically a kind of transmission type liquid level measuring method and measurement mechanism based on line array CCD.
(2) background technology
Liquid level is one of measurement parameter most important and more common in the industrial process.The measurement of liquid level mainly is meant vapour-liquid, liquid-liquid, liquid-solid interface location measuring technique, and it is widely used in the liquid storage equipment such as chemical industry, oil and propulsion system.Existing level measuring method has pressure type level gauge, sink and emerge type level gauge, electric capacity level gauge and ultrasonic liquid level measuring method etc., but when strength of fluid, temperature variation or when being subjected to environmental restraint, the resolution of above-mentioned measuring method is low, error more maybe can not be implemented to measure.
Along with the progress of Modern Optics Technology and photoelectron technology, the accurate manufacturing technology and the performance of charge-coupled image sensor have obtained fast development.This makes subtle change of the high-resolution survey liquid level utilize line array CCD become possibility, and provides new means for level gauging.
Mainly contain three kinds of level measuring methods at present based on CCD.One, based on the laser-bounce method of line array CCD: the realization principle of this method is by the oblique upper incident beam of laser of a laser instrument in tested liquid level, beam reflected is received by line array CCD, when liquid level change, the contact point of laser and liquid level changes, this changes the location of pixels of line array CCD institute receiving beam, thereby measures liquid level.The main weakness of this method is to be subject to Effect of Environmental, is difficult on the motion carrier and uses.Two, based on the optical imagery method of line array CCD: the realization principle of this method is to utilize the light of baffle reflection line source to the pairing opposite side of light source, and the light that is reflected passes transparent vessel and imaged on the CCD by optical lens.This method has been utilized the lens imaging principle in the optics, and measurement range is wide, but needs devices such as object lens, reflecting plate, and it is big to take volume, and in addition because measurement range is big, CCD and liquid level distance are far away, and the adjusting of focal length is also relatively more difficult, is easy to generate than mistake.Three, based on the line source imaging method of CCD: the realization principle of this method is that line source and line array CCD are distributed in cylindricality transparent vessel both sides, the light that line source is launched is by behind the cylindricality transparent vessel of contain fluid, because the lens effect of cylindricality transparent vessel can obtain liquid level information in the cylindricality transparent vessel on the focal length of its equivalent lens.This method structure is simple relatively, but because glass tube itself is lens, line array CCD and glass tube need certain distance, are easy to generate error.In addition to the requirement of line source also than higher, usable range is limited.
(3) summary of the invention
The object of the present invention is to provide a kind of linear array CCD transmission type liquid level measuring method that need not imaging len, is applicable to the level gauging of non-viscous liquid.The present invention also aims to provide a kind of special measurement device of linear array CCD transmission type liquid level measuring method.
The object of the present invention is achieved like this:
Linear array CCD transmission type liquid level measuring method of the present invention comprises:
Be enclosed within by line array CCD and treatment circuit thereof and constitute sensing unit in the casing, airtight sensing unit partly is dipped in the testing liquid, the light-sensitive surface of line array CCD directly contacts with liquid, and the quick line of being made up of the CCD pixel of picture is vertical with tested liquid level; The part that contacts with liquid level on the line array CCD glass produces small concave surface prism; Place tested liquid level top, sensing unit to locate before a pointolite unit, light can be shone directly on the light-sensitive surface that is in the liquid level top of line array CCD; Line array CCD be in light-sensitive surface, the light-sensitive surface corresponding of liquid level below, the light-sensitive surface that is in the liquid level top with small concave surface prism receive respectively the liquid level below than the weak signal section, with the most weak section of the liquid level position corresponding position and the liquid level top light intensity of signal segment by force; The light intensity signal amplitude that records by analysis line array CCD chip records liquid level.
Linear array CCD transmission type liquid level measuring method of the present invention is to realize by such device:
The LED pointolite is enclosed in and constitutes light source cell in the transparent shield; Line array CCD, treatment circuit are enclosed in to form in the airtight casing and constitute sensing unit; Line array CCD is embedded in width on the side of the airtight casing fluting the same with CCD chip width and in the slit of closed box inside and outside both sides cross-notching and CCD chip and carries out sealing, and the cover plate of CCD chip slightly protrudes from this side of airtight casing simultaneously; The sensing unit requirement that line array CCD is vertical with surface level according to making, the while liquid level is in line array CCD photosensitive area middle part is placed the container relevant position; The requirement that light source cell is placed on the front upper place of line array CCD and makes the LED pointolite be higher than tested liquid level according to the LED pointolite places the container relevant position.
Device of the present invention can also comprise:
1, described treatment circuit comprises CCD driving circuit, data acquisition and treatment circuit and data transmission circuit.
2, described sensing unit is placed the container relevant position is that sensing unit is placed container that fills testing liquid or the sidewall of being close to container, and the intersection of liquid level and CCD cover plate produces small concave surface prism; It is described that light source cell is placed the container relevant position is that light source cell is placed container.
3, during non-cpntact measurement, described container is a transparent vessel, and described light source cell and sensing unit are placed the container relevant position is that light source cell and sensing unit are placed outside the container, and CCD and container side wall are close to.
The present invention is a kind of linear array CCD transmission type liquid level measuring method and device that need not imaging len, and this is applicable to the level gauging of non-viscous liquid.It partly is dipped in an airtight sensing unit in the testing liquid, this sensing unit is made up of line array CCD circuit, image acquisition and data processing unit, the light-sensitive surface of line array CCD chip directly contacts with liquid, and the quick line of being made up of the CCD pixel of picture is vertical with tested liquid level; Place tested liquid level top, sensing unit to locate before a pointolite, light can be shone directly on the light-sensitive surface that is in the liquid level top of CCD, the light-sensitive surface that CCD is in liquid level below can receive the light after liquid refracting and scattering, because liquid is to the scattering and the absorption of light, the CCD pixel of liquid level below is littler than the light intensity that the CCD pixel in the liquid level top receives; In addition, because the infiltration effect between liquid and the glass makes that liquid surface is local on the line array CCD glass and produce small concave surface prismatic effect, thereby cause line array CCD to be starkly lower than the light intensity that the CCD pixel below liquid level top and the liquid level receives corresponding to the received light intensity of this place pixel.Like this, complete ccd signal image will be divided into three sections: the strong signal segment in liquid level top, liquid level below than the weak signal section and with the most weak section of liquid level position corresponding position, these characteristics have comprised sufficient liquid level information, just can realize level gauging accurately by analyzing Linear Array CCD Signal intensity.
Infiltration effect or other boundary effect between liquid and the glass have been utilized, need not under the condition of optical imaging lens, obtain the different output valve of each pixel intensity of CCD by pointolite with line array CCD with its formation transmission-type optical position relation, these numerical value can directly reflect the liquid level feature.This mode has not relative simple, the advantage such as be easy to lay, can work of influence, the structure of liquid body temperature variation and concentration change of precision under abominable industrial environments such as corrosivity, if place the transparent vessel outside can realize non-contact measurement in this device.
(4) description of drawings
Fig. 1 is a principle schematic of the present invention;
Fig. 2 is the present invention's different output data synoptic diagram of each pixel intensity of line array CCD when surveying liquid level;
Fig. 3 is the contactless level gauging synoptic diagram of the present invention.
(5) embodiment
In conjunction with Fig. 1, the linear array CCD transmission type liquid level measurement mechanism comprises LED pointolite 3 and transparent shield 4, airtight casing 7, line array CCD 6, circuit unit 8 (comprising: CCD driving, data acquisition and processing and data-transformation facility), line array CCD 6 is embedded in the airtight casing 7 a certain lateral width fluting the same with CCD chip width and in the slit of airtight casing 7 inside and outside both sides cross-notchings and CCD6 and carries out sealing, guarantees that simultaneously the cover plate of CCD6 slightly protrudes from this side of airtight casing 7.Airtight casing 7 is placed the container 12 that fills testing liquid 2 sidewall of container (or be close to), and make line array CCD vertical with surface level, liquid level 1 is in line array CCD photosensitive area middle part simultaneously, and will at intersection with CCD cover plate produce small concave surface prism 5 owing to soak into effect liquid this moment; For realizing the transmission-type optical measurement, will place the LED pointolite 3 of transparent shield 4 to be placed on the front upper place of airtight casing 7, and make LED pointolite 3 be higher than tested liquid level 1.So can get the graph of a relation of the amplitude of each pixel of line array CCD and its output signal, in conjunction with Fig. 2, the most weak section 10 of being produced of the strong signal segment 9 in liquid level top, liquid level below wherein than weak signal section 11 with liquid level position corresponding position concave surface prism 5, level gauging can be realized by these information in actual this Duan Weiyi arrowband.Be range extension, can introduce a hunting gear, make airtight casing 7 roughly follow liquid level motion and write down its displacement, thereby realize the wide range level gauging.
In conjunction with Fig. 3, if place the transparent vessel outside can realize non-contact measurement in this device, as Fig. 3.
Can select different pointolite of spectral coverage and line array CCD for use for different testing liquids.
Claims (5)
1. linear array CCD transmission type liquid level measuring method, it is characterized in that: be enclosed within by line array CCD and treatment circuit thereof and constitute sensing unit in the casing, partly be dipped in airtight sensing unit in the testing liquid, the light-sensitive surface of line array CCD directly contacts with liquid, and the quick line of being made up of the CCD pixel of picture is vertical with tested liquid level; The part that contacts with liquid level on the line array CCD glass produces small concave surface prism; Place tested liquid level top, sensing unit to locate before a pointolite unit, light can be shone directly on the light-sensitive surface that is in the liquid level top of line array CCD; Line array CCD be in light-sensitive surface, the light-sensitive surface corresponding of liquid level below, the light-sensitive surface that is in the liquid level top with small concave surface prism receive respectively the liquid level below than the weak signal section, with the most weak section of the liquid level position corresponding position and the liquid level top light intensity of signal segment by force; The light intensity signal amplitude that records by analysis line array CCD chip records liquid level.
2. the special measurement device of a linear array CCD transmission type liquid level measuring method, it is characterized in that: the LED pointolite is enclosed in and constitutes light source cell in the transparent shield; Line array CCD, treatment circuit are enclosed in to form in the airtight casing and constitute sensing unit; Line array CCD is embedded in length, width on the side of the airtight casing fluting the same with length, the width of CCD chip and in the slit of closed box inside and outside both sides cross-notching and CCD chip and carries out sealing, and the cover plate of CCD chip slightly protrudes from this side of airtight casing simultaneously; The sensing unit requirement that line array CCD is vertical with surface level according to making, the while liquid level is in line array CCD photosensitive area middle part places the container that fills testing liquid, and the intersection of liquid level and CCD cover plate produces small concave surface prism; Light source cell is placed on the front upper place of line array CCD according to the LED pointolite and requirement that the LED pointolite is higher than tested liquid level places the container that fills testing liquid.
3. the special measurement device of linear array CCD transmission type liquid level measuring method according to claim 2 is characterized in that: described treatment circuit comprises CCD driving circuit, data acquisition and treatment circuit and data transmission circuit.
4. the special measurement device of a linear array CCD transmission type liquid level measuring method, it is characterized in that: the LED pointolite is enclosed in and constitutes light source cell in the transparent shield; Line array CCD, treatment circuit are enclosed in to form in the airtight casing and constitute sensing unit; Line array CCD is embedded in length, width on the side of the airtight casing fluting the same with length, the width of CCD chip and in the slit of closed box inside and outside both sides cross-notching and CCD chip and carries out sealing, and the cover plate of CCD chip slightly protrudes from this side of airtight casing simultaneously; The sensing unit requirement that line array CCD is vertical with surface level according to making, the while liquid level is in line array CCD photosensitive area middle part places and fills outside the container for the treatment of side liquid, and CCD and described container side wall are close to; The requirement that light source cell is placed on the front upper place of line array CCD and makes the LED pointolite be higher than tested liquid level according to the LED pointolite places outside the described container, and described container is a transparent vessel.
5. the special measurement device of linear array CCD transmission type liquid level measuring method according to claim 4 is characterized in that: described treatment circuit comprises CCD driving circuit, data acquisition and treatment circuit and data transmission circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101374088A CN101387538B (en) | 2008-10-29 | 2008-10-29 | Linear array CCD transmission type liquid level measuring device |
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| CN2008101374088A CN101387538B (en) | 2008-10-29 | 2008-10-29 | Linear array CCD transmission type liquid level measuring device |
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| CN101387538A CN101387538A (en) | 2009-03-18 |
| CN101387538B true CN101387538B (en) | 2010-06-02 |
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| CN101788320B (en) * | 2010-03-17 | 2011-11-16 | 哈尔滨工程大学 | Bevel edge type liquid level measurement method and device based on isosceles right triangular prism |
| CN101782419B (en) * | 2010-03-17 | 2011-06-22 | 哈尔滨工程大学 | Liquid level measuring method and device based on isosceles right triangular prism |
| CN101988845B (en) * | 2010-07-30 | 2012-04-18 | 西安理工大学 | Device and method for detecting fused silica liquid level by laser curved mirror reflection |
| CN102095473B (en) * | 2010-12-26 | 2012-06-13 | 河海大学常州校区 | Transmission type photoelectric liquid level meter |
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| CN102645253B (en) * | 2012-04-26 | 2014-06-18 | 宝力马（苏州）传感技术有限公司 | Photoelectric continuous liquid level measuring method and device |
| CN104266710A (en) * | 2014-09-15 | 2015-01-07 | 湖南欧杰生物科技发展有限公司 | Full-automatic volume measurement device and production method thereof |
| CN104614046A (en) * | 2015-02-11 | 2015-05-13 | 天津理工大学 | Oil-water interface position measuring method based on CCD |
| CN104614045A (en) * | 2015-02-11 | 2015-05-13 | 天津理工大学 | Oil-water interface position measuring device |
| CN106644606A (en) * | 2016-11-17 | 2017-05-10 | 西安培华学院 | Collection device of expired air condensed liquid |
| CN106524930A (en) * | 2016-12-19 | 2017-03-22 | 中国科学院烟台海岸带研究所 | Photoelectric composite type wireless sensing method and device for water body petroleum hydrocarbon pollutant thickness |
| CN110361074B (en) * | 2018-03-26 | 2020-09-08 | 华中科技大学 | Photoelectric liquid level detection device |
| CN110172399B (en) * | 2019-05-27 | 2020-03-27 | 哈尔滨工业大学 | Ultramicro injection detection and control device and method based on lens-free imaging technology |
| CN115014461A (en) * | 2022-04-25 | 2022-09-06 | 山东产研信息与人工智能融合研究院有限公司 | Liquid level measuring device and method integrating millimeter wave radar and height sensor |
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| CN1070474A (en) * | 1991-09-10 | 1993-03-31 | 北京光电技术研究所 | The method and apparatus of laser precision detection of liquid level |
| US5463228A (en) * | 1992-12-19 | 1995-10-31 | Boehringer Mannheim Gmbh | Apparatus for the detection of a fluid phase boundary in a transparent measuring tube and for the automatic exact metering of an amount of liquid |
| US20040178916A1 (en) * | 2003-03-12 | 2004-09-16 | Ming-Chih Lu | Device for gauging level of stored objects |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070474A (en) * | 1991-09-10 | 1993-03-31 | 北京光电技术研究所 | The method and apparatus of laser precision detection of liquid level |
| US5463228A (en) * | 1992-12-19 | 1995-10-31 | Boehringer Mannheim Gmbh | Apparatus for the detection of a fluid phase boundary in a transparent measuring tube and for the automatic exact metering of an amount of liquid |
| US20040178916A1 (en) * | 2003-03-12 | 2004-09-16 | Ming-Chih Lu | Device for gauging level of stored objects |
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