CN102967583B - Measuring apparatus and method used for measuring liquid phase gas refraction index - Google Patents
Measuring apparatus and method used for measuring liquid phase gas refraction index Download PDFInfo
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- CN102967583B CN102967583B CN201210447155.0A CN201210447155A CN102967583B CN 102967583 B CN102967583 B CN 102967583B CN 201210447155 A CN201210447155 A CN 201210447155A CN 102967583 B CN102967583 B CN 102967583B
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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
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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
- G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle
Abstract
The invention discloses a measuring apparatus used for measuring the liquid phase gas refraction index. The measuring apparatus comprises a point light source illuminating module, a detection prism, a reflected light receiving module and an image analysis module, wherein to-be-tested liquid phase gas is detected by a light beam generated by the point light source illuminating module, one prism surface of the detection prism is contacted with the surface of to-be-tested liquid to form a refection plane, the light beam sent by the point light source illuminating module focuses to form a light spot on the reflection plane, and the light spot is completely reflected and partially reflected; the reflected light receiving module is used for collecting light rays reflected by the reflection plane, and converting the collected light spot image information into electrical signals to be output; and the image analysis module is used for processing the output light spot image information and extracting the light and shade boundary of the light spot so as to obtain the refraction index of the to-be-tested object. The invention further discloses a method used for measuring the liquid phase gas refraction index. The measuring apparatus and the method disclosed by the invention can efficiently measure the liquid phase gas refraction index, and the measuring apparatus and the method have the advantages of high precision, easiness in maintenance and realization, strong anti-jamming capability and the like, and also have the advantage that the measuring apparatus and the method are less influenced by the environment.
Description
Technical field
The present invention relates to light refractive index fields of measurement, be specifically related to a kind of light refractive index measuring instrument and measuring method, for measurement and the qualitative analysis of the various characterisitic parameters of the liquid-phase gas under high pressure, also can measure liquid solution under normal temperature, normal pressure simultaneously.
Background technology
Refractive index is not only the fundamental physical quantity characterizing optical characteristic of substance, and be new material synthesis, material differentiates and an important performance parameter in scientific research, its density, concentration, temperature and stress and so on physical quantities with material is relevant, is widely used in the technical fields such as optics, oil refining, papermaking, food, material.
Liquid-phase gas refractive index and other physical and chemical property parameter also exist linear relationship, and the measurement of refractive index is easier to realize relative to the measurement of other physical quantity.According to Lorentz-Lorenz formula, the refractive index of material is the function of the number N of the microscopic particle (atom or molecule) in unit volume in material.Also can be applicable to gas by this liquid-phase gas refractometer of above-mentioned principle to differentiate and proximate analysis.
At present, the measuring method of liquid-phase gas refractive index is mainly divided into wave optics, SPR technique, optical fiber sensing technology, critical angle method.Wave optics advantage is that measuring accuracy is high, but the method realizability is poor, higher to equipment requirement, anti-interference is poor, cost is higher is not suitable for large-scale production and application.The advantage of SPR technique be measuring accuracy high, be applicable to business application, but the method Measuring Time is longer, cannot realize that on-line measurement, the interference of anti-introduced contaminants are poor, interface metal film is easily corroded, and is not suitable for refractometry under extreme condition.The advantage of optical fiber sensing technology is that high, the anti-outside electromagnetic interference of measurement sensistivity is comparatively strong, but the method to requirement on devices compared with high, system realize cost compared with high, by bubble and interface impurity effect large.
The advantage of critical angle method is that measuring accuracy is high, strong interference immunity, system maintenance are simple, be applicable to large-scale production and application, be applicable to the refractometry of extreme condition liquid-phase gas.Abbe refractometer is the Typical Representative of critical angle method, because its measuring principle is simple, precision is high, system reliability is high, anti-external interference uses in a large number in industrial and agricultural production and field of scientific study by force.
Critical angle method is divided into focus type critical method and divergence form critical method by detecting spot size on interface.CN 102012359 discloses a kind of divergence form critical angle and sends out the method measuring liquid parameter.The method is radiated at by incident ray in the matter of detection interface, reflected by light and be totally reflected thus measuring refractive indexes of liquid in detection interface generating portion.Test surface needed for the method is comparatively large, is only suitable for the parameter measuring liquid under normal temperature, normal pressure.And, because its light beam inciding prism test surface of divergence form critical method has the fixing angle of divergence, the refractive index of detection boundary material is uneven, therefore refractometry scope is narrow, test surface is easily subject to impurity effect, constraint beam capability poor, easily because of light leakage, the air-gap of influential system precision, prism hypotenuse/facet surfaces is easily subject to ectocine, and makes thrashing.
Focus type critical method utilizes plano-convex lens by incident beam focus on measurement interface, thus measure the refractive index of focal spot.The advantage of the method is that measuring accuracy is not influenced by index distribution on interface is different, the terminator of imaging end hot spot is obvious, measurement range is large more than divergence form critical method, maintain easily, be easy to large-scale production and application.By device being inverted the interference that can improve the anti-interfacial bubbles of system and impurity, thus reduce systematic error raising system accuracy.By changing the focal length of the image distance of illuminator, object distance and lens, the scope of prism test surface incident angle can be increased, thus reach and expand refractometry scope.
Summary of the invention
The object of the invention is to propose a kind of measuring instrument measuring the refractive index of liquid-phase gas based on total reflection principle, it utilizes focus type critical method to measure the refractive index of liquid-phase gas, to differentiate for gas and proximate analysis is laid a good foundation, simultaneously this refractive index have sampling less, high, the on-line measurement of the measurement of liquid or liquid-phase gas under the extreme condition such as applicable high pressure, precision, the advantage such as easy to maintenance.
Realizing a kind of measuring instrument for measuring liquid-phase gas refractive index of the object of the invention, comprising:
Spot light module, it comprises LED light source, coupling mechanism, multimode optical fiber and output lens, the light that described LED light source exports is coupled in multimode optical fiber through described coupling mechanism, and outgoing after described lens focus after multimode optical fiber transmission, to detect liquid-phase gas to be detected;
Detection prism, surface thereof and described testing liquid surface contact form reflecting surface, and the light beam after the outgoing of described spot light module is focused to a bit on this reflecting surface, form hot spot, and total reflection and part reflection occur;
Reflected light receiver module, it is for collecting the light through the reflection of described prismatic reflection face, and the light signal of collection is converted to the output of electric signal formation image information;
Image analysis module, it processes the image information exported, and extracts the terminator in hot spot, and then obtains the refractive index of determinand.
As improvement of the present invention, described measuring instrument also comprises sampling cavity volume for accommodating testing liquid, and its upper face has circular hole, and described testing liquid forms described reflecting surface by the surface contact of this circular hole and described detection prism.
As improvement of the present invention, incide in the light beam of bottom surface, the light beam that incident angle is greater than critical angle is totally reflected, and incident angle is less than the light beam generating portion reflection of critical angle, and its portion of energy is transmitted in liquid-phase gas to be measured.
As improvement of the present invention, the terminator that described image analysis module is extracted in hot spot can be adopted with the following method:
A () is drawn and is got the region that comprises described terminator in light spot image;
B (), to selected region, by the view data superposition of wherein every a line, obtains the view data after a line superposition;
(c) to the view data after the superposition of this row, using the difference wherein arbitrarily between row pixel and its previous column pixel as slope, using point maximum for slope as boundary point.
Spot light module of the present invention can by changing the distance shaven head and lens of light source, the distance of the focal length of plano-convex lens and plano-convex lens and prism upper surface, change the size of the angle of divergence of incident beam, thus strengthen measurement range and the system accuracy of refractive index.According to Si Nieer (Snell) principle, light is when optically denser medium is refracted into optically thinner medium, and refraction angle is greater than incident angle, and refraction angle increases with the increase of incident angle, and when incident angle increases to certain value, refraction angle will be increased to 90 degree.In light beam, some light will be totally reflected, and in light beam, the energy of other a part of light is by the transmission of part reflecting part.As Fig. 3, when incident angle is greater than or equal to critical angle, there is not transmission in incident ray; When incident angle is less than critical angle, incident ray generation transmission, energy of reflection light reduces.Incident beam is constant and Refractive Index of Glass Prism n1 certain, and when liquid refractivity n2 occurs relatively to change, the change along with n2 changes by critical angle θ c.By the position of terminator in computational reflect hot spot, just can by calculating organic solution density value.
The optical prism of refractometer of the present invention can be equilateral prism, and the light beam that pointolite sends is through lens focus, and converging ray is focused into a bit on prism test surface S2 through prism S1 face.On S2 face, sensing point contacts with testing liquid, and a part of angle light is totally reflected, in addition a part of light generating portion reflection.Converged in CCD image planes by lens through the light therethrough S3 face of S2 face reflection.
The effect of the ray-collecting module of refractometer of the present invention be flare is coupled to CCD light-sensitive surface on thus realize whole receptions of flare, and the light signal of reception is converted to electric signal and exports.This CCD can be the line array CCD of one dimension, also can be the area array CCD of two dimension.
The spot light module of refractometer of the present invention is made up of LED, coupling mechanism, multimode optical fiber and output lens.The light that LED exports couples light in multimode optical fiber through coupling mechanism, and the light beam through multimode optical fiber can think a branch of pointolite with certain angle of divergence.Coupling fiber output beam expands the angle of divergence through lens and focuses of the light beam on prism test surface.This module can improve measurement range and the precision of system by the angle of divergence of expanded light beam.
Refractometer of the present invention adopts focus type critical angle method, can overcome the impact that prism test surface material refractive index is uneven.Can be inverted at measurement timer, measurement point and liquid-phase gas to be measured or liquid comes into contact can be ensured like this, thus raising system rejection to disturbance ability.The present invention does not need specialized designs fine structure that detection prism is carried out encapsulation process, and the air-gap of prism hypotenuse/facet surfaces is not subject to external action simultaneously.This refractometer utilizes focus type critical angle method can measure the liquid gas with high strength pressure, and divergence form critical angle method due to prism bases and testing liquid contact area comparatively large, prism encapsulation process is more difficult.
Another object of the present invention is to provide a kind of method for measuring liquid-phase gas refractive index, comprising:
S1: utilize the LED light bundle of light source generation for measuring;
S2: focused on by light beam in the prism facets of detection prism, this prism facets and described liquid-phase gas surface contact to be measured form reflecting surface, light beam focuses on and forms hot spot on this reflecting surface, and total reflection and part reflection occur;
S3: collect the light through described reflective surface, and the light spot image collected is processed, extract the terminator in hot spot, and then the refractive index of determinand can be obtained.
Apparatus and method of the present invention measure liquid-phase gas refractive index have precision high, safeguard simple, realize easily, antijamming capability is strong, by measuring the advantages such as environmental impact is little.
Accompanying drawing explanation
Fig. 1 is that the one of the embodiment of the present invention is for liquid-phase gas refractive index on-line measurement instrument.
Fig. 2 is the structural drawing of embodiment of the present invention mid point source illumination module.
Fig. 3 is critical angle method reflection ray and transmitted ray schematic diagram in the embodiment of the present invention.
Fig. 4 is flare figure in embodiment of the present invention middle ideal situation.
In Fig. 5, (a) is the principle schematic of focus type critical method of the present invention, the principle schematic of the divergence form critical method that (b) is prior art.
Fig. 6 be certain liquid-phase gas in CCD image planes terminator with component variations in refractive index figure.
When Fig. 7 is the refractive index measuring instrument measurement saline solution of the embodiment of the present invention, the graph of relation of saline solution concentration and pixel.
Fig. 8 is the refractometer of embodiment of the present invention when measuring certain liquid phase mixed gas, the terminator figure of light spot received.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described, but the present invention is not limited only to this embodiment.
As Fig. 1, the refractive index measuring instrument of the present embodiment comprises the fine lighting module 1 of LED light, detection prism 3, high pressure liquid phase gas sample cavity volume 4, energy of reflection light collection module 5 and image processing module 7.
Liquid-phase gas to be measured enters sampling cavity volume 4 by the entrance in the sampling module 4 of measuring instrument, and the liquid-phase gas entering sampling cavity volume 4 contacts with detection prism 3 bottom surface and forms reflecting surface.Air in sampling cavity volume 4 or impurity are discharged by the outlet of sampling cavity volume 4.This sampling cavity volume 4 in the present embodiment can bear 50 atmospheric pressure, is applicable to the sampling of most liquid-phase gas.
The light beam inciding detection prism 3 focuses on detection prism 3 bottom surface by the fine spot light module 1 of LED light.Incide the light beam of bottom surface, the light beam that incident angle is greater than critical angle is totally reflected; Incident angle is less than the light beam generating portion reflection of critical angle, and namely some energy transmission is in liquid-phase gas to be measured.Flare is coupled in the CCD image planes of receiver module 5 through lens 5 by the light beam through detection boundary reflection.CCD converts the light signal of reception to electric signal and is input in image processing module 7.Terminator in hot spot extracts by the flare image obtained by image processing module 7, and obtains the relational expression of terminator position and liquid-phase gas refractive index to be measured, then can obtain the refractive index of liquid-phase gas to be measured.
Extracting for the terminator in hot spot in the present embodiment preferably to adopt the differential method differential method to be that difference by comparing reflected light light intensity judges critical angle, and this makes it possess anti-interference strong advantage.According to Fresnel reflection principle, when the liquid of a certain density covers sensor prism surperficial, there is a terminator in the image of the hot spot that cmos image sensor photographs, density is higher, boundary is more turned right movement, and the displacement of the recruitment of density and boundary is linear.This image boundary can be extracted by the differential method.Demarcate the position of the known titer of several groups of density boundary in the picture, just calculate density and the refractive index of liquid to be measured by boundary recognizer.
Adopt the concrete image algorithm principle of the differential method as follows in the present embodiment: a) to draw and get region; as shown in Figure 4; border circular areas is the hot spot in CMOS shot image; a terminator is there is in hot spot; in order to ensure measurement range and measuring accuracy; first draw in circular light spot region and get a rectangular region (rectangular region in upper figure hot spot), only the data of taking out in square frame process; B () superposes by row, for selected rectangular region, the data investigation of every a line is got up, and finally obtains the data after a line superposition.This method superposed by row can increase the interference free performance of system; (c) FIR filtering, design FIR low-pass filter, filtering high frequency noise, increases the interference free performance of algorithm; D () boundary is extracted, native system adopts Slope Method to extract boundary, and namely for the i-th row pixel, the difference between the i-th+1 row pixel and the i-th row pixel is as slope, and using the position of point maximum for slope as boundary, wherein i is arbitrary integer.
The refractive index that online liquid-phase gas refractive index measuring instrument of the present invention not only can survey the refractive index of solution, the refractive index of electrolytic solution can also measure liquid-phase gas.When liquid-phase gas air pressure is constant, due to glass material, to bear pressure capability general less, and glass is stressed is simultaneously directly proportional to contact area, therefore should be smaller than the area of liquid-phase gas to be measured thus avoid glass prism because of stressed excessive and break.Traditional refractometer is comparatively large due to detection area, can only measure solution and can not measure the refractive index of the liquid-phase gas with larger pressure.This refractive index measuring instrument utilizes the principle be totally reflected in physical optics, and employing focus type critical angle method measurement liquid-phase gas refractive index can realize the measurement to liquid-phase gas refractive index, and needed for the method, sampling face is little, is easy to measure the liquid-phase gas of high pressure.
Measuring instrument of the present invention can carry out refractometry to the liquid-phase gas under high pressure, can certainly measure the refractive index of the various liquid under the liquid under high pressure or normal pressure.
A kind of method for measuring liquid-phase gas refractive index of the present invention, comprising:
S1: utilize the LED light bundle of light source generation for measuring;
S2: focused on by light beam in the prism facets of detection prism, this prism facets and described liquid-phase gas surface contact to be measured form reflecting surface, light beam focuses on and forms hot spot on this reflecting surface, and total reflection and part reflection occur;
S3: collect the light through described reflective surface, and the light spot image collected is processed, extract the terminator in hot spot, and then the refractive index of determinand can be obtained.
Liquid-phase gas to be measured contacts the reflecting surface that formed with prism facets can be consistent or adapt with the spot size of light beam.Liquid-phase gas to be measured is contained in one and opens in round-meshed cavity volume 4, and this cavity volume surface abuts with prism facets, and liquid-phase gas to be measured is contacted with prism facets by this circular hole and forms reflecting surface.This circular hole is very little, and to guarantee that it can bear the high pressure of liquid-phase gas, this circular hole can be consistent with spot size.
The physical model of measuring instrument of the present invention can be determined by Snell law, Fresnel reflection law and total reflection principle.Refractometer measurement range can be evaluated by following formula,
n
x＝n
gsinθ
c
In formula, n
xfor test substance refractive index, n
gfor glass refraction, θ
cfor critical angle, θ
ifor incident angle, θ
zfor angle of transmission, R
nfor the reflectivity of prism test surface.The formula with measuring principle is determined, refractometer measurement range [n according to the ranges of incidence angles of interface glazed thread
min, n
max] have:
With concrete example, the specific performance of refractive index measuring instrument of the present invention and use are described below.
Example 1
Utilize measuring instrument of the present invention when room temperature to saline solution density carry out measurement and and standard hand-held Density Measuring Instrument compare, measuring method is as follows:
First by the common salt aqueous solution of different densities gradient, utilize Abbe refractometer instrument to measure, then by standard hand-held Density Measuring Instrument, its concentration is measured.
Clean the sampling module of the present invention's type model machine with distilled water, common salt aqueous solution to be measured is put into sampling module.The light beam of light source focuses on the interface of detection prism and saline solution by spot light module, and the light beam through boundary reflection is coupled on the light-sensitive surface of CCD by receiving light path.By VC interface, the limit information in light spot received is extracted, and refractive index and the density of testing liquid is obtained by image algorithm, and refractive index value and density value and Abbe refractometer apparatus measuring value and standard hand-held Density Measuring Instrument measured value are compared, calculate relative error simultaneously.Above-mentioned LED coupled fiber module selects wavelength to be that the LED of 532nm is coupled to multimode optical fiber.
Use the same method and remaining common salt aqueous solution measured, and obtain common salt aqueous solution refractive index and variable density curve.
Example 2
Utilize measuring instrument of the present invention when room temperature to distilled water, 75% medicinal alcohol, saturated Nacl solution and certain concentration sucrose solution density carry out measurement and and Abbe refractometer instrument compare, measuring method is as follows:
First by above-mentioned solution, utilize Abbe refractometer instrument to measure, then solution is put into respectively the sampling module of the invention type model machine calibrated.The refractive index of each solution is obtained by VC algorithm.Solution refractive index and Abbe refractometer measured value are compared, and calculates relative error.Table 1 is measured various normal fluid refractive index value for this refractometer and is compared with Abbe refractometer.
The various fluid measuring value of table 1. compares with Abbe measured value
Example 3
Utilize measuring instrument of the present invention to measure certain liquid phase component gases refractive index at low temperatures, and by refractive index qualitative analysis gas composition, measuring method is as follows:
Liquid-phase gas outlet to be measured is connected on the entrance of model machine sampling module by copper pipe, when liquid-phase gas enters sampling module, outlet valve and liquid-phase gas inlet valve is closed.Liquid-phase gas to be measured due to gravity effect with detection prism S3 face contact and form reflecting surface.Fine for LED light lighting module and CCD are powered on, the light beam with certain angle of divergence is pooled on the reflecting surface that detection prism S3 and liquid-phase gas to be measured form by the fine lighting module of LED light, and convergent beam total reflection occurs on the reflecting surface and partly reflects.The light beam of generating portion reflection has part energy and projects in liquid-phase gas to be measured, energy-producing loss.The energy that the light beam that generating portion reflects enters receiving system is determined by Fresnel reflection rate curve.Light beam through reflection is coupled in the image planes of CCD by receiving system.Along with the change of component, in CCD image planes, the terminator of hot spot also changes.Fig. 8 is that terminator is with component variations in refractive index figure.
Claims (4)
1., for measuring a measuring instrument for liquid-phase gas refractive index, comprising:
Spot light module (1), it comprises LED light source (11), coupling mechanism (12), multimode optical fiber (13) and output lens (14), the light that described LED light source (11) exports is coupled in multimode optical fiber (13) through described coupling mechanism (12), outgoing after being focused on by described lens (14) after this multimode optical fiber (13) transmission, to detect liquid-phase gas to be detected;
Detection prism (3), one prism facets and described liquid-phase gas surface contact to be detected form reflecting surface, light beam after the outgoing of described spot light module (1) is focused into and a bit forms hot spot on this reflecting surface, and total reflection and part reflection occur;
Reflected light receiver module (5), it collects the light through described reflective surface, and the light spot image information of collection is converted to electric signal output;
Image analysis module (7), it processes the light spot image information exported, and extracts the terminator in hot spot, and then can obtain the refractive index of determinand;
Described measuring instrument also comprises sampling cavity volume (4), and for accommodating testing liquid, its surface has circular hole, and described testing liquid forms described reflecting surface by the surface contact of this circular hole and described detection prism (3).
2. a kind of measuring instrument for measuring liquid-phase gas refractive index according to claim 1, it is characterized in that, incide in the light beam of reflecting surface, the light beam that incident angle is greater than critical angle is totally reflected, incident angle is less than the light beam generating portion reflection of critical angle, and its portion of energy is transmitted in liquid-phase gas to be detected.
3. a kind of measuring instrument for measuring liquid-phase gas refractive index according to claim 1 and 2, is characterized in that, the terminator that described image analysis module (7) is extracted in hot spot adopts following process:
A () chooses the region that comprises described terminator in light spot image;
B (), to selected region, by the view data superposition of wherein every a line, obtains the view data after a line superposition;
(c) to the view data after the superposition of this row, using the difference wherein arbitrarily between row pixel and its previous column pixel as slope, using point maximum for slope as boundary point.
4. utilize the method measuring liquid-phase gas refractive index for the measuring instrument measuring liquid-phase gas refractive index according to any one of claim 1-3, comprising:
S1: utilize the LED light bundle of light source generation for measuring;
S2: focused on by light beam in the prism facets of detection prism, this prism facets and described liquid-phase gas surface contact to be detected form reflecting surface, light beam focuses on and forms hot spot on this reflecting surface, and total reflection and part reflection occur; Wherein, described liquid-phase gas to be detected is contained in one and opens in round-meshed cavity volume (4), this cavity volume surface abuts with described prism facets, described liquid-phase gas to be detected is contacted with described prism facets by this circular hole and forms reflecting surface, and described liquid-phase gas to be detected contacts reflecting surface and the described light beam formed spot size with described prism facets is consistent;
S3: collect the light through described reflective surface, and the light spot image collected is processed, extract the terminator in hot spot, and then the refractive index of determinand can be obtained.
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| CN103454247B (en) * | 2013-08-26 | 2016-05-25 | 华中科技大学 | A kind of apparatus for measuring refractive index of machine with wide range and method |
| CN103645119B (en) * | 2013-12-17 | 2015-12-09 | 哈尔滨工程大学 | A kind of measurement mechanism of the area array CCD liquid density measurement based on pointolite |
| CN104702248B (en) * | 2015-01-29 | 2017-12-01 | 复旦大学 | Ultrafast laser balance detection photoelectric pulse signal shaping methods and realize circuit |
| ITUA20161345A1 (en) * | 2016-03-04 | 2017-09-04 | Eltek Spa | SENSOR DEVICE FOR CONTAINERS OF LIQUID SUBSTANCES |
| CN108489899A (en) * | 2018-02-13 | 2018-09-04 | 中国海洋石油集团有限公司 | A kind of fluid reflected light measurement device |
| CN109187431B (en) * | 2018-10-23 | 2023-06-16 | 北京领航力嘉机电有限公司 | Liquid refractive index measuring device and measuring method |
| CN109632719B (en) * | 2018-11-28 | 2021-07-06 | 中国海洋石油集团有限公司 | Method and device for detecting gas in fluid |
| DE102019108559A1 (en) * | 2019-04-02 | 2020-10-08 | Endress+Hauser Process Solutions (Deutschland) GmbH | Refractometer and method for determining the refractive index of a process medium with a refractometer |
| CN111007037A (en) * | 2019-11-23 | 2020-04-14 | 成都佳鑫德科技有限公司 | Liquid concentration measuring device based on optical device, computer equipment and computer readable storage medium |
| WO2023023964A1 (en) * | 2021-08-25 | 2023-03-02 | 深圳市流数科技有限公司 | Refractometer, smart cup, and refractive index measurement method |
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