CN206710245U - A kind of digital liquid refraction by prism instrument based on line array CCD - Google Patents
A kind of digital liquid refraction by prism instrument based on line array CCD Download PDFInfo
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- CN206710245U CN206710245U CN201720374108.6U CN201720374108U CN206710245U CN 206710245 U CN206710245 U CN 206710245U CN 201720374108 U CN201720374108 U CN 201720374108U CN 206710245 U CN206710245 U CN 206710245U
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- prism
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- array ccd
- refraction
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- 239000007788 liquid Substances 0.000 title claims abstract description 89
- 238000003384 imaging method Methods 0.000 claims abstract description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 18
- 239000012780 transparent material Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 abstract description 7
- 230000003287 optical effect Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 4
- 238000009795 derivation Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000015170 shellfish Nutrition 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- IQQRAVYLUAZUGX-UHFFFAOYSA-N 1-butyl-3-methylimidazolium Chemical compound CCCCN1C=C[N+](C)=C1 IQQRAVYLUAZUGX-UHFFFAOYSA-N 0.000 description 1
- RVEJOWGVUQQIIZ-UHFFFAOYSA-N 1-hexyl-3-methylimidazolium Chemical compound CCCCCCN1C=C[N+](C)=C1 RVEJOWGVUQQIIZ-UHFFFAOYSA-N 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002608 ionic liquid Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/4133—Refractometers, e.g. differential
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/4133—Refractometers, e.g. differential
- G01N2021/4153—Measuring the deflection of light in refractometers
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
The utility model discloses a kind of digital liquid refraction by prism instrument based on line array CCD, refractometer includes a monochromatic LED light source, liquid prism, liquid crystal display, high-performance microprocessor, temperature sensor, shell, also include wavelength measuring apparatus, imaging lens group and line array CCD, light incidence liquid prism surface from monochromatic LED light source, form obvious clear zone and dark space on line array CCD through imaging lens group after liquid prism reflects, the information of clear zone and dark space is extracted by high-performance microprocessor, corresponding refractive index is calculated after processing, shown on a liquid crystal display together with wavelength and temperature value.The utility model, in itself as optical prism, is replaced several solid prisms in conventional Abbe refractometer using only a liquid prism, simplifies structure, alleviate weight, reduce cost by the use of testing liquid.
Description
Technical field
The utility model belongs to liquid refractivity and strength of fluid, the technical field of density measure device, more particularly to one
Digital liquid refraction by prism instrument of the kind based on line array CCD.
Background technology
In industrial and agricultural production and scientific research, liquid refractivity is that the physics of sign transparency liquid optical properties of materials is normal
Number.In various refractive index measurement methods, have plenty of using hot spot Mobile Method to realize, have plenty of and utilize critical angle method, minimum
Deviation horn cupping, total reflection method measure, also using Mach-Zender interferometer method, Michelson interferometer method, Fabry-
The interferometric methods such as glass sieve interferometer mode are realized.In recent years, there are some new measuring methods such as capillary imaging method, transmitted light
Grid, method wick-containing zoom post lens method etc..
At present, domestic and international the most frequently used refractometry instrument is Abbe refractometer, and Abbe refractometer is relatively inexpensive,
Precision is higher, and its refractometry scope is 1.3000~1.7000.But with liquid such as ionic liquid, liquid polymers
New kind continue to bring out, the ranges of indices of refraction of fluent material constantly expands, about 1.6~2.4, such as [BMIM] [I9]
Refractive index is 2.4, [HMIM] [I3] refractive index be 1.88 etc..Abbe refractometer is far from meeting these new liquid materials
Measurement need.Although the Arago series refractometer measurement ranges of French Cordoua companies production up to 1.2~3.1,
Price but wants hundreds of thousands one, cost height.Above-mentioned refractometer and measuring method are required to survey to realize by manual operation simultaneously
Amount, the manual measurement error brought into is difficult to control, and along with operating procedure is excessively cumbersome, causes the operating efficiency of measurement low.
Application No. 201621211702.5, the utility model of entitled " a kind of digital refractometer based on liquid prism " disclose
A kind of digital refractometer based on liquid prism, also uses liquid prism, and the plane of incidence of prism handle so that entering
The complete diffusion penetrated can form bright-dark cut in exit facet, and single-chip microcomputer controlled motor rotates, in rotation process, by photosensitive
Sensor detects output intensity, and the angular encoder being connected with the rotating shaft of motor can feed back the anglec of rotation, calculates accordingly pair
The liquid refractivity value answered.The patent reduces the cost of refractometer to a certain extent, but weak point be the precision of measurement not
Enough height, can not meet some occasions higher to required precision.
In summary, prior art can not meet that market is low to cost, measurement range is big, can realize measurement process spy automatically
The demand of the refractometer of point.
Utility model content
The utility model is directed to a kind of digital refractometer based on liquid prism, the refractometer can solve above-mentioned Ah
Refractometry scope is less in the lens type measuring instrument such as shellfish refractometer, structure is more complicated, needs gauger's manual measurement etc.
Problem, and cost can be reduced.
To achieve the above object, the utility model proposes technical scheme be a kind of digital liquid based on line array CCD
Refraction by prism instrument, refractometer include monochromatic LED light source, liquid prism, liquid crystal display, high-performance microprocessor, a temperature
Sensor, shell, in addition to wavelength measuring apparatus, imaging lens group and line array CCD, the light incidence liquid from monochromatic LED light source
Body prism surface, obvious clear zone and dark space are formed on line array CCD through imaging lens group after liquid prism reflects, by high property
Energy microprocessor calculates corresponding refractive index after the information in clear zone and dark space is extracted, handled, together with wavelength and temperature value
Display is on a liquid crystal display.
Further, above-mentioned wavelength measuring apparatus uses in a length of 450nm~589nm of incident light wave and interference filter may be selected
Device, near-infrared wavelength detector is used during a length of 681~1000nm of incident light wave.
The plane of incidence and exit facet angle of the hollow prism of aforesaid liquid prism are 30 °, and hair is polished on the outside of the plane of incidence
Face, the bottom surface of hollow prism carry a removable cover, for canned and pouring liquid, are filled with testing liquid and form a liquid
Prism.
Above-mentioned hollow prism uses the transparent material without the limitation of refractive index size.
Compared with the prior arts such as Abbe refractometer, the beneficial effects of the utility model：
1st, the utility model by the use of testing liquid in itself as optical prism, using only a liquid prism replace conventional Ah
Several solid prisms in shellfish refractometer, simplify structure, alleviate weight, reduce cost.
2nd, liquid prism refractometer of the present utility model general refraction by prism instrument more this kind of than Abbe has wider array of refractive index
Measurement range, at the same it is again more much lower than the refractometer cost of equal measurement range.
3rd, the utility model can avoid smearing leakage because liquid is non-homogeneous in the solid prisms refractometer such as Abbe refractometer
Measurement error caused by light, accuracy are higher.
4th, the utility model directly finds bright-dark cut using line array CCD, and calculates folding using high-performance microprocessor
Radiance rate value, the uncompensable errors that manual measurement is brought are reduced, operating aspect, greatly increase measurement efficiency.
5th, the utility model refractometry scope is not limited by the refractive index size of solid prisms material, breaches Abbe
The limitation of this kind of general refraction by prism instrument of Abbe.
6th, the utility model liquid prism refractometer is easy to make, and is readily converted to production and is generalized to market.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model,
Indicate explanation：Monochromatic LED (1), interference filter (2), liquid prism (3), imaging lens group (4), line may be selected
It is battle array CCD (5), liquid crystal display (6), high-performance microprocessor (7), near-infrared wavelength detector (8), temperature sensor (9), outer
Shell (10).
Fig. 2 is liquid prism schematic diagram,
Identifier declaration：11- prism light entrance faces；12- prism light-emitting faces；Prism removable cover hollow 13-.
Fig. 3 is the principle schematic for measuring liquid refractivity based on glancing incidence method using liquid prism,
Identifier declaration：11- prism light entrance faces；12- prism light-emitting faces；Dotted line is the liquid of filling；θ0~θ5Exist for light
The entering of each interface, refraction angle；The two light and shade visual fields and boundary line that rear " bright " " dark " loop graph expression detector receives.
Embodiment
The utility model is created in conjunction with Figure of description and is described in further detail.
The utility model proposes the operation principle of digital refractometer mainly utilize liquid prism the characteristics of, by
In empty prism liquid filling body whether or carry out the flexible optics for changing liquid prism by adjusting strength of fluid, changing class of liquids etc.
Property, build an adjustable system of optical property.
As shown in figure 1, digital refractometer includes a monochromatic LED 1, interference filter 2 may be selected, suitable for incident light
Wavelength is that 450nm~589nm situation, liquid prism 3, imaging lens group 4, line array CCD 5, liquid crystal display 6, high-performance are micro-
Processor 7, near-infrared wavelength detector 8, it is situation, temperature sensor 9 suitable for a length of 681~1000nm of incident light wave, outer
Shell 10.
The plane of incidence and exit facet angle of hollow prism needed for structure liquid prism 3 described in the utility model are equal to
30 °, and hair side is polished on the outside of the light entrance face of hollow prism, the bottom surface on its top carries a removable cover, for canned
And pouring liquid, it is filled with testing liquid and forms a liquid prism.
The light irradiation that monochromatic LED 1 described in the utility model is sent is formed in liquid prism hair side side and diffused, by
Snell theorems, light forms obvious clear zone and dark space through the imaged lens group 4 of liquid prism on linear array CCD5, by height
Performance microprocessor 7 handles the data in the photosensitive members of CCD5 using Boundary extracting algorithm and calculates out corresponding refractive index.This mistake
The measuring environment temperature of temperature sensor 9 in journey, near-infrared wavelength detector 8, this is applied to a length of 681~1000nm of incident light wave
Situation, measure lambda1-wavelength, last liquid crystal using interference filter 2 may be selected during a length of 450nm~589nm of incident light wave
Will display wavelength, temperature and refractive index value on display 6.
The utility model specific implementation process includes：Testing liquid is injected into formation liquid rib in hollow prism first
Mirror 3, the surface of light incidence liquid prism 3 from monochromatic LED light source 1, because the plane of incidence of prism has been polished into hair side so that enter
It is complete diffusion to penetrate light, is reflected through liquid prism 3, can form clearly bright-dark cut in exit facet, it is micro- to press high-performance
Processor 7 switchs, and light forms obvious clear zone and dark space, CCD through the imaged lens group 4 of liquid prism on linear array CCD5
Drive circuit exports the data message stored in the photosensitive members of CCD, obtains representing the light intensity vision signal of photosurface, then have high property
Vision signal is converted into 8 position digital signals by the A/D converter in the energy acquisition system of microprocessor 7, finally micro- by high-performance
The reason reading of device 7 simultaneously using Boundary extracting algorithm processing data and calculates corresponding refractive index.Temperature sensor 9 measures during this
Environment temperature, near-infrared wavelength detector 8, this is applied to a length of 681~1000nm of incident light wave situation, and incident light wave is a length of
Using interference filter 2 may be selected during 450nm~589nm, measure incident wavelength size and include wavelength and temperature value in liquid
On crystal display 6.Further the concentration of testing liquid, density can be gone out by refractive index and concentration, the relation derivation of density, can also
Study the physical relationship between liquid refractivity and room temperature, lambda1-wavelength.
As shown in Fig. 2 the utility model liquid prism is made up of liquid filling body in hollow prism, hollow prism uses
Transparent material without the limitation of refractive index size, light entrance face outside are polished into hair side, and its light entrance face and exit facet angle etc.
In 30 °, upper bottom surface carries a removable cover, for canned and pouring liquid, when liquid is filled with, that is, forms a liquid rib
Mirror.In use, liquid prism is placed on objective table, make one side face incident light source of prism.
Measuring principle is as shown in Figure 3：The liquid prism drift angle that the utility model uses is α.Monochromatic LED light is incident, in liquid
Body prism incidence face forms omnirange diffused light.Assuming that liquid refractivity is nl, prism walls refractive index is ng, determined according to Snell
Rule：
sinθ0=ngsinθ1=nlsinθ2
nlsinθ3=ngsinθ4=sin θ5
θ3=α-θ2
Assuming that work as light glancing incidence, i.e. incidence angle θ0At=90 °, in the liquid medium on the inside of hollow prism face and prism
Refraction angle in exit facet rear air is θcWithHave：
And it is as follows to go out measuring refractive indexes of liquid formula by above-mentioned several derivations of equation：
N as shown from the above formulalIt is unrelated with hollow prism wall refractive index, so refractometry scope is not by hollow prism
The limitation of wall material refractive index.The liquid prism independent equivalent to one, this point breach the limitation of Abbe refractometer.
Refraction angle θ of light of any incidence angle less than 90 ° at the rear of prism exit facet 35It is all higher thanThat is light
On the outside of glancing incidence light.There are light and shade Liang Ge areas as visual field in rear, and shadow line is glancing incidence light after prism
The position being just emitted.If refraction angle is measured by light receiving elementValue, i.e. shadow line position then can be by liquid refracting
Rate measure equation draws the refractive index of testing liquid.Further prepare liquid can be gone out by refractive index and concentration, the relation derivation of density
Concentration, the density of body.
In summary, liquid prism apex angle α determines refractometry scope, and apex angle α is different, and measurement range is different.When
During prism vertex angle α=30 °, measuring refractive indexes of liquid scope is：1.0000~3.8600.
The utility model is based on glancing incidence principle measurement liquid refractivity, and the ribs such as foregoing Abbe are replaced with a liquid prism
Several solid prisms in mirror refractometer.Compared to Abbe refractometer, there is wider array of measurement range, be in liquid prism drift angle
At 30 °, ranges of indices of refraction can be surveyed and reach 1.0000-3.8600.And after with a liquid prism replacing multiple solid prisms, structure
Become simple, weight, cost is lower.The error that gauger's subjective reading brings can be avoided using digital thought, by
In the application of line array CCD, high-performance microprocessor, precision is up to 10-5, an order of magnitude is improved compared with Abbe refractometer.Simultaneously
The solid prisms such as Abbe refractometer refractometer can be avoided due to measurement error, accuracy caused by the non-homogeneous smearing light leak of liquid
It is higher, and it is readily converted into product.
It should be noted that embodiment of above is only to illustrate the technical solution of the utility model and unrestricted, although
The utility model has been described in detail by above preferred embodiment, it is to be understood by those skilled in the art that
Various changes can be made to it in the form and details, without departing from the utility model limited range.
Claims (4)
1. a kind of digital liquid refraction by prism instrument based on line array CCD, the refractometer include a monochromatic LED light source (1),
Liquid prism (3), liquid crystal display (6), high-performance microprocessor (7), temperature sensor (9), shell (10), it is characterised in that
Also include wavelength measuring apparatus, imaging lens group (4) and line array CCD (5), the light incidence liquid rib from monochromatic LED light source (1)
Mirror (3) surface, obvious clear zone and dark is formed on line array CCD (5) through imaging lens group (4) after liquid prism (3) refraction
Area, corresponding refractive index is calculated after the information in clear zone and dark space is extracted, handled by high-performance microprocessor (7), together with
Wavelength and temperature value are shown on liquid crystal display (6).
2. the digital liquid refraction by prism instrument according to claim 1 based on line array CCD, it is characterised in that the wavelength
Measurement apparatus uses in a length of 450nm~589nm of incident light wave may be selected interference filter (2), and incident light wave a length of 681~
Near-infrared wavelength detector (8) is used during 1000nm.
3. the digital liquid refraction by prism instrument according to claim 1 based on line array CCD, it is characterised in that the liquid
The plane of incidence and exit facet angle of the hollow prism of prism (3) are 30 °, and hair side, hollow prism are polished on the outside of the plane of incidence
Bottom surface carry a removable cover, for canned and pouring liquid, be filled with testing liquid and form a liquid prism.
4. the digital liquid refraction by prism instrument according to claim 3 based on line array CCD, it is characterised in that described hollow
Prism uses the transparent material without the limitation of refractive index size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720374108.6U CN206710245U (en) | 2017-04-11 | 2017-04-11 | A kind of digital liquid refraction by prism instrument based on line array CCD |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720374108.6U CN206710245U (en) | 2017-04-11 | 2017-04-11 | A kind of digital liquid refraction by prism instrument based on line array CCD |
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| Publication Number | Publication Date |
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| CN206710245U true CN206710245U (en) | 2017-12-05 |
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|---|---|---|---|
| CN201720374108.6U Expired - Fee Related CN206710245U (en) | 2017-04-11 | 2017-04-11 | A kind of digital liquid refraction by prism instrument based on line array CCD |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979907A (en) * | 2017-04-11 | 2017-07-25 | 南京邮电大学 | A kind of digital liquid refraction by prism instrument based on line array CCD |
| CN108593599A (en) * | 2018-05-29 | 2018-09-28 | 莆田市烛火信息技术有限公司 | A kind of brine for kitchen use, syrup concentration measure Intelligent water cup |
| CN110749423A (en) * | 2019-09-23 | 2020-02-04 | 商丘师范学院 | Method and system for measuring refractive index of prism |
-
2017
- 2017-04-11 CN CN201720374108.6U patent/CN206710245U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979907A (en) * | 2017-04-11 | 2017-07-25 | 南京邮电大学 | A kind of digital liquid refraction by prism instrument based on line array CCD |
| CN108593599A (en) * | 2018-05-29 | 2018-09-28 | 莆田市烛火信息技术有限公司 | A kind of brine for kitchen use, syrup concentration measure Intelligent water cup |
| CN110749423A (en) * | 2019-09-23 | 2020-02-04 | 商丘师范学院 | Method and system for measuring refractive index of prism |
| CN110749423B (en) * | 2019-09-23 | 2021-08-20 | 商丘师范学院 | Method and system for measuring refractive index of prism |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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