CN101509801B - Intelligent light source linear array CCD liquid level measuring method and device - Google Patents
Intelligent light source linear array CCD liquid level measuring method and device Download PDFInfo
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- CN101509801B CN101509801B CN2009100715408A CN200910071540A CN101509801B CN 101509801 B CN101509801 B CN 101509801B CN 2009100715408 A CN2009100715408 A CN 2009100715408A CN 200910071540 A CN200910071540 A CN 200910071540A CN 101509801 B CN101509801 B CN 101509801B
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Abstract
The invention discloses an intellectualized light source linear array CCD liquid level measurement method and a measurement device. By using a feedback measurement structure, the method can obtain a result of comparably high precision through measurement of twice or a plurality of times and the intellectualized regulation of the light source. The device mainly consists of a point-to-point switch controllable linear array light source, a linear array CCD, a control circuit, etc. During the measurement of liquid level, all the luminous points on the linear array light source intelligently complete primary measurement scanning and determine the basic position of liquid level; the partial luminous points on the linear array light source are closed so as to complete the accurate measurement of liquid level. The intellectualized light source linear array CCD liquid level measurement method is a liquid level measurement method with higher precision and also an optical liquid level measurement method needing no optical imaging lenses, and has the advantages of little effect on the precision by the temperature change and concentration change of liquid, relatively simple structure, easiness for arrangement and the capability of working under corrosiveness and other vile industrial environments, etc. If a receiving device is arranged outside a transparent container, non-contact measurement can be realized.
Description
(1) technical field
What the present invention relates to is a kind of level measuring method and device, specifically a kind of intelligent light source linear array CCD liquid level measuring method and measurement mechanism.
(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 uppity systematic error.
(3) summary of the invention
The object of the present invention is to provide a kind of intelligent light source linear array CCD liquid level measuring method that need not imaging len, is applicable to non-viscous liquid level gauging.The present invention also aims to provide a kind of special measurement device of intelligent light source linear array CCD liquid level measuring method.
The object of the present invention is achieved like this:
Intelligent light source linear array CCD liquid level measuring method of the present invention comprises:
Be enclosed within by line array CCD and circuit thereof and constitute sensing control unit in the casing, airtight sensing control 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; With the controlled line source of a pointwise switch unit of forming by LED or LCD partly be dipped in the testing liquid, place, the dead ahead of sensing unit, make light can shine directly into whole photosensitive regions of line array CCD; Sensing control unit and light source cell form closed loop; The measurement flow process is as follows: sensing control unit is sent the line source scan control signal and is just declared liquid level position according to the picture signal that is obtained, indication closed line light source top luminous point according to this position, obtain new view data, by handling and analyzing this view data and can determine the relative more accurate liquid level position of result of just declaring.
Intelligent light source linear array CCD liquid level measuring method of the present invention is to realize by such device:
Line source is enclosed in and constitutes light source cell in the transparent shield; Line array CCD, control circuit are enclosed in to form in the airtight casing and constitute the control 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 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 of control sensing unit is placed the container relevant position; Light source cell is placed the container relevant position according to the requirement that partly is dipped in the testing liquid, the place, dead ahead of sensing unit makes light can shine directly into whole photosensitive regions of line array CCD.
Device of the present invention can also comprise:
1, described control circuit comprises CCD driving circuit, data acquisition and treatment circuit, light source pointwise ON-OFF control circuit and data transmission circuit, and has intelligence control light function.
2, sensing unit be will control and container that fills testing liquid or the sidewall of being close to container placed; Light source cell is placed container.
3, during non-cpntact measurement, described container is a transparent vessel, light source cell is opposite to outside the container mutually with the control sensing unit, and is close to container side wall.
The present invention is a kind of intelligent light source linear array CCD 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 unit such as line array CCD circuit, image acquisition and data processing, 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; With the controlled line source of a pointwise switch unit of forming by LED or LCD partly be dipped in the testing liquid, place, the dead ahead of sensing unit, make light can shine directly into whole photosensitive regions of line array CCD; Sensing control unit and light source cell form closed loop; By an intelligent measure flow process, can obtain the liquid level image information, analysis of image data can be determined liquid level.In this closed-loop measuring process, one-shot measurement is made up of preliminary survey and two links of accurate measurement usually, the preliminary survey link is the necessary light source adjustment information of accurate measurement link feedback, adjusts the luminophor of back array light source above liquid level and extinguishes, and give certain luminance compensation to continuing luminous luminophor.
After light source is adjusted automatically, the light that light source sends under the liquid goes out to cross the generation total reflection at liquid-to-air interface (liquid level), scattering takes place in water body simultaneously, need not under the condition of optical imaging lens, the line array CCD pixel of liquid level below obtains the bigger output valve of intensity, the line array CCD pixel of liquid level top obtains the less output valve of intensity, and sudden change place of such frame CCD complete image numerical value just reflects the liquid level feature.This mode has that system mistake reduces with the relevance of liquid level change, measuring accuracy is higher, not relative simple, the no moving-member of influence, the structure of liquid body temperature variation and concentration change, can be in advantage such as badly work under the industrial environment 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 structural representation of the present invention;
Fig. 2 is a light path principle synoptic diagram of the present invention;
Fig. 3 is the contactless level gauging synoptic diagram of the present invention;
Fig. 4 is the amplitude synoptic diagram of each pixel output signal of line array CCD of the present invention.
(5) embodiment
In conjunction with Fig. 1, the optical total-reflection type linear array CCD liquid level measurement mechanism comprises LED line source 3 and transparent shield 4, airtight casing 7, line array CCD 6, control circuit unit 8 (comprising: CCD driving circuit, data acquisition and treatment circuit, light source pointwise ON-OFF control circuit and data transmission circuit), 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 5 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; Light source cell partly is dipped in the testing liquid, place, the dead ahead of sensing unit, makes light can shine directly into whole photosensitive regions of line array CCD, and the CCD of liquid level top partly is in the total reflection blind area 12 of liquid level below light source.So can get the amplitude synoptic diagram of each pixel output signal of line array CCD, in conjunction with Fig. 4, wherein the sudden change section 10 between the more weak and smooth signal segment 9 in liquid level top, the strong signal segment 11 in liquid level below and two sections can realize level gauging by these information.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 (3)
1. intelligent light source linear array CCD liquid level measuring method, it is characterized in that: be enclosed within by line array CCD and circuit thereof and constitute sensing control unit in the casing, partly be dipped in airtight sensing control 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; With the controlled line source of a pointwise switch unit of forming by LED or LCD partly be dipped in the testing liquid, place, the dead ahead of sensing unit, make light can shine directly into whole photosensitive regions of line array CCD; Sensing control unit and light source cell form closed loop; Sensing control unit is sent the line source scan control signal and is just declared liquid level position according to the picture signal that is obtained, indication closed line light source top luminous point according to this position, obtain new view data, by handling and analyzing this view data and can determine the relative more accurate liquid level position of result of just declaring.
2. the special measurement device of an intelligent light source linear array CCD liquid level measuring method is characterized in that: the controlled line source of being made up of LED or LCD of pointwise switch is enclosed in and constitutes light source cell in the transparent shield, and switch controlling signal is from sensing control unit; Line array CCD, control circuit are enclosed in the airtight casing and constitute sensing control unit; Line array CCD is embedded in length and width on the side of the airtight casing fluting the same with the length and 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; Line array CCD is vertical with surface level, liquid level is in the requirement at line array CCD photosensitive area middle part simultaneously according to making with sensing unit, and sensing unit is placed the container that fills testing liquid or selects transparent vessel sensing unit to be close to the sidewall of container.
3. the special measurement device of intelligent light source linear array CCD liquid level measuring method according to claim 2, it is characterized in that: described control circuit comprises CCD driving circuit, data acquisition and treatment circuit, light source pointwise ON-OFF control circuit and data transmission circuit, and has intelligence control light function.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100715408A CN101509801B (en) | 2009-03-16 | 2009-03-16 | Intelligent light source linear array CCD liquid level measuring method and device |
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| CN2009100715408A CN101509801B (en) | 2009-03-16 | 2009-03-16 | Intelligent light source linear array CCD liquid level measuring method and device |
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| CN101509801A CN101509801A (en) | 2009-08-19 |
| CN101509801B true CN101509801B (en) | 2010-10-20 |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN102221390A (en) * | 2011-03-23 | 2011-10-19 | 哈尔滨工程大学 | Liquid level measurement device and liquid level measurement method based on linear array CCD (Charge Coupled Device) and transparent tube |
| CN104568062A (en) * | 2014-12-19 | 2015-04-29 | 惠州优科睿迪检测技术有限公司 | Illumination visualization structure for liquid level of barrel body |
| 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 |
| 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 |
| CN105890708A (en) * | 2016-05-12 | 2016-08-24 | 天津大学 | Light source adjusting method for online liquid level detection of glass bottles |
| GB201614717D0 (en) * | 2016-08-31 | 2016-10-12 | Ge Healthcare Bio Sciences Ab | Detection of foam levels |
| CN107702764A (en) * | 2017-09-30 | 2018-02-16 | 中北大学 | The full direct-injection type level sensor of gas generator optics |
| CN107702765A (en) * | 2017-09-30 | 2018-02-16 | 中北大学 | HTHP extreme environment optical total-reflection type level sensor |
| 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 |
| CN110260945B (en) * | 2019-07-09 | 2020-11-03 | 北京大学 | Total reflection type gas-liquid interface flow display method and gas-liquid interface position identification method |
| CN114322929B (en) * | 2022-01-07 | 2023-03-10 | 浙江同禾传感技术有限公司 | Static leveling device and using method thereof |
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