CN103822902A - Real-time online liquid physical parameter measuring device with window glass used as sensing window - Google Patents
Real-time online liquid physical parameter measuring device with window glass used as sensing window Download PDFInfo
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- CN103822902A CN103822902A CN201410070373.6A CN201410070373A CN103822902A CN 103822902 A CN103822902 A CN 103822902A CN 201410070373 A CN201410070373 A CN 201410070373A CN 103822902 A CN103822902 A CN 103822902A
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Abstract
A real-time online liquid physical parameter measuring device with a window glass used as a sensing window is disclosed. Window glass is arranged on a container filled with a liquid. A cassette is arranged on the periphery of the window glass on the container. A semiconductor laser installed on a support is disposed inside the cassette. A CCD camera which is connected with a computer through a data line is arranged at an end of the cassette. The device is characterized in that an imaging layer is attached to the outer surface of the window glass; a light-emitting end of the semiconductor laser is provided with a self-focusing rod-shaped lens which is lapped with the imaging layer; and optical axis of the self-focusing rod-shaped lens and center line of the CCD camera are vertical to the window glass and are positioned at the central position of the imaging layer. The device provided by the invention has advantages of simple structure, clear boundary of obtained optical images, high contrast ratio, wide measurement range, fast measuring speed, high precision, no influence on liquids in pipelines and the like, and can be used in online real-time measurement of refractive index of a transparent liquid and a semitransparent liquid.
Description
Technical field
The invention belongs to optical measuring apparatus or device technique field, be specifically related to adopt the device of laser measurement liquid refractivity.
Background technology
The refractive index of different liquids (solution), concentration, density, pol, soluble solid, proportion etc. are the important physical parameters that characterizes different liquid or same liquid different technologies characteristic.The measurement of these parameters has very important significance in fields such as chemical industry, oil, coal, pharmacy, biology, food, beverage, environmental protection, papermaking, material science and education and scientific research.Therefore the above-mentioned physical parameter research of measuring technique is accurately and fast the hot issue of association area always, and along with the appearance of various new technologies, measuring method and device that it is new continue to bring out.
Research shows in certain scope, to have linear relationship between the above-mentioned parameter of same liquid, and can mutually convert.For transparent or semitransparent liquid, the measurement of refractive index more easily realizes with respect to the measurement of other physical quantity, after its detecting refractive index, can obtain corresponding other parameter by existing typical curve (equation) or canonical parameter table, therefore belonging to the measurement of the liquid refractivity of field of optical measuring technologies, is key and the effective method that obtains other relevant physical parameter.
In laboratory, liquid refractivity adopts off-line measurement method mostly, is placed in surveying instrument or measuring system allocation really by appropriate testing liquid, makes its part that forms light path, then measures calculating according to relevant optical effect.But conventional Abbe refractometer, SPR measuring technique and the liquid refractivity off-line measurement technology based on physioptial interference, diffraction approach, due to the non real-time property that complicacy and the measurement data of its apparatus structure obtain, cannot meet the requirement of relevant physical parameter real-time online measuring in industrial processes.Prepare etc. in the industrial production system in field at chemical industry, pharmacy, sugaring, beverage, gas liquefaction, material simultaneously, liquid is generally all in closed system, and often in non-normal temperature, non-atmospheric pressure state, or belong to poisonous and harmful, flammable and combustible liquids, or valuable volatile liquid, therefore adopting noncontact real-time online detection technique, is the unique channel that realizes liquid physical parameters measurement and monitoring in production run.
Refraction and the reflex of utilizing light action to produce in the time of testing liquid, non-patent technology and the patented technology of real-time online measuring that realizes liquid refractivity is a lot.The patent No. of seminar's invention at inventor place is the Chinese patent that ZL201010118898.4, denomination of invention are " liquid refractive index real-time measuring device and online test method thereof ", exist following not enough: one, belong to sonde-type measurement mechanism, can only carry out plug-in type measurement, obviously be only suitable in the measurement of liquid in open container physical parameter, and in industrial production system, liquid is in the pipeline or container under non-normal temperature, non-atmospheric pressure state often, therefore cannot realize real non-cpntact measurement; Its two, adopt optical fiber light-guiding and glass texturing in the face of incident light scattering, contrast and the sharpness on the circular blackening border relevant to liquid refractivity forming on photoimaging layer are not high, have seriously affected its measuring accuracy.A large amount of experimental studies have found that, is mainly because optical fiber light-guiding is too little at photoimaging layer center incident light intensity, and glass texturing is too poor in the face of the dispersion effect of incident light, causes the contrast on circular blackening border too low; The simultaneously size of incident luminous point, determine the sharpness on circular blackening border, and the size of the light intensity of optical fiber light-guiding and its outgoing luminous point exists insoluble contradiction.The problems referred to above are restricting the raising of its measuring accuracy.
Summary of the invention
Technical matters to be solved by this invention is to overcome the shortcoming of above-mentioned patent, and a kind of simple in structure, cost is low, measuring accuracy is high device take sight glass as sensing window mouth real-time online measuring liquid physical parameter is provided.
Solving the problems of the technologies described above adopted technical scheme is: it has set up imaging layer at the outside surface of sight glass, on the light exit side of semiconductor laser, be provided with and the self-focusing bar type lens of imaging layer overlap joint, the optical axis of self-focusing bar type lens is vertical with sight glass with the center line of CCD camera and be positioned at the center of imaging layer.
Imaging layer of the present invention is made up of the light scattering imaging layer that is attached to white on sight glass outside surface paint or white glass ink transmission scattering layer and the peripheral same material of transmission scattering layer, the diameter of transmission scattering layer is 5～8mm, and the sight glass of transmission scattering layer is set up to transmissivity 40%～50 ﹪ of green laser in surface; The sight glass that light scattering imaging layer is set up on surface is 60%～70 ﹪ to the light transmission of green laser; The described light exit side of self-focusing bar type lens and the center of transmission scattering layer overlap joint.
Because the present invention utilizes the optical characteristics of sight glass conventional on industrial pipeline or container, take sight glass as measurement window with sensing element, realize in production run in flowing, sealing, non-normal pressure, the very noncontact of liquid multiparameter under temperature state, noiseless measure in real time online.
Because the present invention adopts the Liquid Paraffin enamelled coating of outside surface coating or the imaging layer of white glass ink layer formation at sight glass, semiconductor laser emitting laser bundle sees through when the transmissivity of imaging layer central authorities is less is the larger transmission scattering layer of thickness, be subject to the scattering process of a large amount of micron order white pigment granules in transmission scattering layer, after making laser beam by transmission scattering layer, become the pointolite of high divergence, radial light incides behind the interface of glass and testing liquid through sight glass, the light reflection that meets total reflection condition is higher to the peripheral transmissivity of transmission scattering layer is on the light scattering imaging layer that thickness is less, form take incident luminous point on transmission scattering layer as the center of circle, the circular blackening that image boundary contrast is high.The imaging layer that transmission scattering layer and light scattering imaging layer form, has solved that traditional glass frosted face is low for scattering of light degree, the problem of imaging obscurity boundary.
The present invention adopts self-focusing bar type lens, by the beam convergence of semiconductor laser emitting laser on the central point of the transmission scattering layer of imaging layer central authorities, due to the high-effective concentration function of self-focusing bar type lens, make the luminous point at the center that is incident in transmission scattering layer little, light intensity is large, the pointolite divergence forming after scattering is high, and the sharpness on the circular blackening border forming at light scattering imaging layer significantly improves.
The present invention has optical imagery sharpness of border, contrast simple in structure, that install easily, obtain are high, measurement range is wide, measuring speed is fast, precision is high, to advantages such as liquid in pipeline have no effect, avoided traditional insertion sonde-type measurement mechanism in pipeline or the impact of liquid in container and use in water-stop problem, can be used for the online of transparency liquid and translucent liquid refractive index and measure in real time, be particularly suitable for the noncontact on-line real time monitoring of the multiple physical parameters of liquid in industrial processes.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is imaging layer 1 structural representation of the embodiment of the present invention 1.
Fig. 3 adopts the present invention to measure the circular blackening photo of distilled water refractive index.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention is described in more detail, but the invention is not restricted to these embodiment.
Embodiment 1
In Fig. 1, the device take sight glass 9 as sensing window mouth real-time online measuring liquid physical parameter of the present embodiment is connected and is formed by imaging layer 1, self-focusing bar type lens 2, magazine 3, support 4, CCD camera 5, computing machine 6, semiconductor laser 7, ring flange 8, sight glass 9.
On the interior container 10 that liquid is housed, be installed with sight glass 9 with ring flange 8, sight glass 9 is tabular, the outside surface of sight glass 9 scribbles imaging layer 1, the imaging layer 1 of the present embodiment is Liquid Paraffin enamelled coating, adopt the method for spraying white paint to be sprayed on to the outside surface of sight glass 9, imaging layer 1 is by being positioned at the transmission scattering layer 1-1 of its center and the light scattering imaging layer 1-2 of transmission scattering layer 1-1 periphery forms.The diameter of transmission scattering layer 1-1 is 6mm, transmissivity 40%～50 ﹪ of the sight glass 9 of surface spraying transmission scattering layer 1-1 to green laser; The sight glass 9 of surface spraying light scattering imaging layer 1-2 is 60%～70 ﹪ to the light transmission of green laser.In the imaging layer 1 of this structure, transmission scattering layer 1-1 produces scattering process to the laser beam of passing through.
On ring flange 8 with the screw threads for fastening connector magazine 3 that has been fixedly connected, on magazine 3 madial walls, be fixedly connected support 4 is installed with screw threads for fastening connector, on support 4, be fixedly connected semiconductor laser 7 is installed with screw threads for fastening connector, semiconductor laser 7 is for generation of laser, the bright dipping end of semiconductor laser 7 is connected with self-focusing bar type lens 2, the parameter of self-focusing bar type lens 2 is: wavelength is 400～600nm, diameter 1.8mm, the light incident side of self-focusing bar type lens 2 and the bright dipping end of semiconductor laser 7 connect with optics is gluing, the center overlap joint of the light exit side of self-focusing bar type lens 2 and transmission scattering layer 1-1, the central point of the center line of self-focusing bar type lens 2 and the center line of semiconductor laser 7 and transmission scattering layer 1-1 coincides and perpendicular to sight glass 9.Self-focusing bar type lens 2 assemble laser beam for the light incidence point that light intensity is high, diameter is little at transmission scattering layer 1-1 center, improved the sharpness of the circular blackening image boundary relevant to testing liquid refractive index.
Being incident in light transmission less by semiconductor laser 7 emitting laser bundles is the transmission scattering layer 1-1 center that thickness is larger, during by transmission scattering layer 1-1, be subject to the scattering process of a large amount of micron order white pigment granules in transmission scattering layer 1-1, by becoming the pointolite of high divergence after transmission scattering layer 1-1, radial light enter sight glass 9 and incide glass and the interface of testing liquid after, the light that meets total reflection condition by sight glass 9 with the boundary reflection of testing liquid to the larger light scattering imaging layer 1-2 of the light transmission of transmission scattering layer 1-1 periphery, on light scattering imaging layer 1-2, form take laser incidence point on transmission scattering layer 1-1 as the center of circle, diameter and image boundary contrast relevant to the interior liquid refractivity of container 10, the circular blackening that sharpness is high.End at magazine 3 is fixedly connected CCD camera 5 is installed with screw threads for fastening connector, and the optical axis of the center line of CCD camera 5 and self-focusing bar type lens 2 coincides.The output terminal of CCD camera 5 is connected with computing machine 6 by data, CCD camera 5 converts the image receiving to electric signal and the digital model of making a special trip to a certain place outputs to computing machine 6 by data line, computing machine 6 carries out data processing according to the program of prior setting to the signal of input, calculate the refractive index of fluid to be measured, demonstrate the image of result of calculation and circular blackening.Again as required, according to refractive index and concentration, the isoparametric relation curve of density or the conversion table of existing different liquids, calculate other physical parameter of liquid.
Adopt the method for the interior distilled water refractive index of measuring vessel 10 of the present invention as follows:
Be equipped with at external diameter 90cm on the container 10 of distilled water quartzy sight glass 9 is installed, the parameter of quartzy sight glass 9 is: diameter is that 80mm, thickness h are 5mm, are 1.46007 to the refractive index n of green laser (532nm); In test, the temperature of distilled water is 25 ℃.
Relational expression according to the refractive index of liquid in the upper radius r take the upper laser incidence point of transmission scattering layer 1-1 as the circular blackening in the center of circle forming of light scattering imaging layer 1-2 and container 10:
CCD camera 5 converts the circular blackening radius length signal receiving to digital signal and is transferred to computing machine 6 by data line, computing machine 6 carries out data processing according to (1) formula according to the program of prior setting, and the refractive index that calculates tested distilled water is 1.33251.
Embodiment 2
In the present embodiment, scribble imaging layer 1 at the outside surface of sight glass 9, imaging layer 1 is Liquid Paraffin enamelled coating, adopt the method for spraying white paint to be sprayed on to the outside surface of sight glass 9, imaging layer 1 is by being positioned at the transmission scattering layer 1-1 of its center and the light scattering imaging layer 1-2 of transmission scattering layer 1-1 periphery forms.The diameter of transmission scattering layer 1-1 is 5mm, transmissivity 40%～50 ﹪ of the sight glass 9 of surface spraying transmission scattering layer 1-1 to green laser; The sight glass 9 of surface spraying light scattering imaging layer 1-2 is 60%～70 ﹪ to the light transmission of green laser.The connecting relation of other parts and parts is identical with embodiment 1.
Embodiment 3
In the present embodiment, scribble imaging layer 1 at the outside surface of sight glass 9, imaging layer 1 is Liquid Paraffin enamelled coating, adopt the method for spraying white paint to be sprayed on to the outside surface of sight glass 9, imaging layer 1 is by being positioned at the transmission scattering layer 1-1 of its center and the light scattering imaging layer 1-2 of transmission scattering layer 1-1 periphery forms.The diameter of transmission scattering layer 1-1 is 8mm, transmissivity 40%～50 ﹪ of the sight glass 9 of surface spraying transmission scattering layer 1-1 to green laser; The sight glass 9 of surface spraying light scattering imaging layer 1-2 is 60%～70 ﹪ to the light transmission of green laser.The connecting relation of other parts and parts is identical with embodiment 1.
Embodiment 4
In above embodiment 1～3, scribble imaging layer 1 at the outside surface of sight glass 9, imaging layer 1 is white glass ink layer, adopt the method for silk-screen by white glass ink silk screen printing the outside surface at sight glass 9, imaging layer 1 is by being positioned at the transmission scattering layer 1-1 of its center and the light scattering imaging layer 1-2 of transmission scattering layer 1-1 periphery forms.The diameter of transmission scattering layer 1-1 is identical with corresponding embodiment, transmissivity 40%～50 ﹪ of the sight glass 9 of surperficial silk-screen transmission scattering layer 1-1 to green laser; The sight glass 9 of surface silk-screen light scattering imaging layer 1-2 is 60%～70 ﹪ to the light transmission of green laser.The connecting relation of other parts and parts is identical with embodiment 1.
Claims (2)
1. the device take sight glass (9) as sensing window mouth real-time online measuring liquid physical parameter, on the interior container (10) that liquid is housed, be provided with sight glass (9), the upper sight glass (9) of container (10) periphery arranges magazine (3), the semiconductor laser (7) being arranged on support (4) is set in magazine (3), the end of magazine (3) is provided with the CCD camera (5) being connected with computing machine (6) by data line, it is characterized in that: set up imaging layer (1) at the outside surface of sight glass (9), on the light exit side of semiconductor laser (7), be provided with the self-focusing bar type lens (2) with imaging layer (1) overlap joint, the center line of the optical axis of self-focusing bar type lens (2) and CCD camera (5) is vertical with sight glass (9) and be positioned at the center of imaging layer (1).
2. the device take sight glass (9) as sensing window mouth real-time online measuring liquid physical parameter according to claim 1, it is characterized in that: described imaging layer (1) is by light scattering imaging layer (1-2) formation that is attached to white on sight glass (9) outside surface paint or white glass ink transmission scattering layer (1-1) and the peripheral same material of transmission scattering layer (1-1), the diameter of transmission scattering layer (1-1) is 5～8mm, and the sight glass (9) of transmission scattering layer (1-1) is set up to transmissivity 40%～50 ﹪ of green laser in surface; The sight glass (9) that light scattering imaging layer (1-2) set up on surface is 60%～70 ﹪ to the light transmission of green laser; The light exit side of described self-focusing bar type lens (2) and the center of transmission scattering layer (1-1) overlap joint.
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| CN201410070373.6A CN103822902B (en) | 2014-02-28 | 2014-02-28 | Real-time online liquid physical parameter measuring device with window glass used as sensing window |
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| CN201410070373.6A CN103822902B (en) | 2014-02-28 | 2014-02-28 | Real-time online liquid physical parameter measuring device with window glass used as sensing window |
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| CN103822902B CN103822902B (en) | 2014-12-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941747A (en) * | 2018-01-16 | 2018-04-20 | 济南金宏利实业有限公司 | Device and method based on the MEMS near infrared technologies detection batch mixing uniformity |
| CN113071636A (en) * | 2021-04-06 | 2021-07-06 | 中国科学院半导体研究所 | Underwater optical fairing |
| CN113324990A (en) * | 2021-06-01 | 2021-08-31 | 深圳市先波科技有限公司 | Device capable of being used for on-line monitoring of oil quality and detection method thereof |
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| JPS5690243A (en) * | 1979-12-25 | 1981-07-22 | Nippon Sheet Glass Co Ltd | Refraction index meter for liquid |
| JPS6366441A (en) * | 1986-09-08 | 1988-03-25 | Japan Aviation Electronics Ind Ltd | Refractive index meter |
| CN101776572A (en) * | 2010-03-05 | 2010-07-14 | 陕西师范大学 | Liquid refractive index CCD real-time measuring device and measuring method |
| CN101776571A (en) * | 2010-03-05 | 2010-07-14 | 陕西师范大学 | Liquid refractive index real-time measuring device and on-line measuring method |
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2014
- 2014-02-28 CN CN201410070373.6A patent/CN103822902B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5690243A (en) * | 1979-12-25 | 1981-07-22 | Nippon Sheet Glass Co Ltd | Refraction index meter for liquid |
| JPS6366441A (en) * | 1986-09-08 | 1988-03-25 | Japan Aviation Electronics Ind Ltd | Refractive index meter |
| CN101776572A (en) * | 2010-03-05 | 2010-07-14 | 陕西师范大学 | Liquid refractive index CCD real-time measuring device and measuring method |
| CN101776571A (en) * | 2010-03-05 | 2010-07-14 | 陕西师范大学 | Liquid refractive index real-time measuring device and on-line measuring method |
Non-Patent Citations (1)
| Title |
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| 张全法等: "利用CCD测量液体折射率", 《半导体光电》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941747A (en) * | 2018-01-16 | 2018-04-20 | 济南金宏利实业有限公司 | Device and method based on the MEMS near infrared technologies detection batch mixing uniformity |
| CN113071636A (en) * | 2021-04-06 | 2021-07-06 | 中国科学院半导体研究所 | Underwater optical fairing |
| CN113324990A (en) * | 2021-06-01 | 2021-08-31 | 深圳市先波科技有限公司 | Device capable of being used for on-line monitoring of oil quality and detection method thereof |
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