CN113484284A - Liquid concentration detection system - Google Patents
Liquid concentration detection system Download PDFInfo
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- CN113484284A CN113484284A CN202110765688.2A CN202110765688A CN113484284A CN 113484284 A CN113484284 A CN 113484284A CN 202110765688 A CN202110765688 A CN 202110765688A CN 113484284 A CN113484284 A CN 113484284A
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- G—PHYSICS
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- 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
- G01N21/59—Transmissivity
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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Abstract
The invention provides a liquid concentration detection system, which is used for performing spectrum detection on liquid to be detected containing a preset solute and detecting the concentration of the preset solute in the liquid to be detected, and is characterized by comprising the following components: the image acquisition device is provided with a plurality of vessel grooves for respectively containing different liquids to be detected, a backlight source arranged at the bottom of the vessel grooves and a scanning head for acquiring images of the liquids to be detected in the vessel grooves so as to obtain corresponding liquid color images; a color value extracting part which extracts a color value of the liquid to be measured in the liquid color image as a color value to be measured; the spectral transmittance reconstruction part is provided with a spectral reconstruction model corresponding to the preset solute and used for reconstructing the corresponding spectral transmittance as the reconstructed spectral transmittance according to the color value to be measured; and a concentration determination unit configured to determine a corresponding concentration as a concentration to be measured from the reconstructed spectral transmittance based on a correspondence between the spectral transmittance and a concentration of a predetermined solute.
Description
Technical Field
The invention belongs to the field of liquid detection, and particularly relates to a liquid concentration detection system.
Background
The detection of solute components and contents in liquid is related to the fields of medicine, food, agriculture, environment and the like, and has a very important position in the control of the quality and the production efficiency of products. For example, in the production of drugs, it is often necessary to determine the specific content of solute in some intermediate reagents, and then perform subsequent production when the content meets the requirement to ensure that the finally produced drugs can meet the standard.
At present, separation detection technology, physical and chemical technology and spectral analysis technology are generally adopted to detect the components and the content of the solute in the liquid. However, the detection periods of the former two methods are long, and the operation is inconvenient, so that the method for determining the content of the solute in the liquid through the spectral analysis is relatively simple and convenient, and the detection precision can be ensured.
However, spectroscopic analysis techniques need to rely on the detection of the spectrum of the liquid, which typically needs to be achieved by specialized spectroscopic detection equipment (e.g. spectrometers). The cost of the spectrum detection equipment is high, and when the equipment breaks down, the replacement and maintenance costs are high, so that the cost of industrial production is not reduced.
In addition, when the spectrum detection device performs spectrum detection on the liquid, it also requires a certain time (at least about 1 minute) to detect the spectral transmittance of the liquid. In line production, this detection speed also tends to slow down the production efficiency of the final product.
Disclosure of Invention
In order to solve the problems, the invention provides a liquid concentration detection system, which adopts the following technical scheme:
the invention provides a liquid concentration detection system, which is used for performing spectrum detection on liquid to be detected containing a preset solute and detecting the concentration of the preset solute in the liquid to be detected, and is characterized by comprising the following components: the image acquisition device is provided with a plurality of vessel grooves for respectively containing different liquids to be detected, a backlight source arranged at the bottom of the vessel grooves and a scanning head for acquiring images of the liquids to be detected in the vessel grooves so as to obtain corresponding liquid color images; a color value extracting part which extracts a color value of the liquid to be measured in the liquid color image as a color value to be measured; the spectral transmittance reconstruction part is provided with a spectral reconstruction model corresponding to the preset solute and used for reconstructing the corresponding spectral transmittance as the reconstructed spectral transmittance according to the color value to be measured; and a density determination unit configured to determine a corresponding density as a concentration to be measured from the reconstructed spectral transmittance based on a correspondence between a predetermined density and the spectral transmittance.
The liquid concentration detection system provided by the invention can also have the technical characteristics that: a solute information acquisition unit for acquiring solute information of a predetermined solute in a liquid to be measured, wherein the spectral transmittance reconstruction unit has: the model storage unit stores a plurality of spectral reconstruction models which correspond to different solute information one by one; the model determining unit is used for determining a corresponding spectrum reconstruction model according to the acquired solute information; and the spectrum reconstruction unit is used for inputting the color value to be measured into the determined spectrum reconstruction model to obtain the corresponding reconstructed spectrum transmittance.
The liquid concentration detection system according to the present invention may further include a concentration determination unit including: a relation curve storage unit for storing a relation curve between the spectral transmittance and the concentration of each predetermined solute in the liquid and solute information of the corresponding predetermined solute; the relation curve determining unit is used for determining a corresponding relation curve according to the acquired solute information; and the concentration to be measured calculating unit calculates the concentration to be measured according to the reconstructed spectral transmittance and the determined relation curve.
The liquid concentration detection system provided by the invention can also have the technical characteristics that the spectrum reconstruction model is obtained in advance through the following training steps: step S1, acquiring a plurality of standard liquid color images acquired by the image acquisition device by respectively acquiring standard liquids containing the predetermined solute with different concentrations in advance; step S2, acquiring a color value of the standard liquid in each standard liquid color image as a standard color value and a corresponding spectral transmittance as a standard spectral transmittance; and step S3, training an initial spectrum reconstruction model based on each standard color value and the corresponding standard spectral transmittance until a preset condition is met and a trained spectrum reconstruction model is obtained, wherein the trained spectrum reconstruction model can obtain the corresponding reconstructed spectral transmittance based on the color value to be measured.
The liquid concentration detection system provided by the invention can also have the technical characteristics that a plurality of spectrum reconstruction models are provided and correspond to a plurality of different preset solutes one by one, and the standard liquid is liquid containing the preset solutes with different concentrations and corresponding to the spectrum reconstruction models.
The liquid concentration detection system provided by the invention can also have the technical characteristics that the image acquisition device is also provided with a guide rail mechanism, and the guide rail mechanism is used for sequentially conveying all the vessel tanks to the scanning head, so that the scanning head can scan the conveyed liquid to be detected to obtain the corresponding liquid color image.
Action and Effect of the invention
According to the liquid concentration detection system, the image acquisition device is provided with the vessel groove for containing the liquid to be detected, the backlight source arranged at the bottom of the vessel groove and the scanning head for acquiring the image of the liquid to be detected in the vessel groove to obtain the liquid color image, so that the color image of the liquid to be detected can be acquired by the scanning head with relatively low cost, such as a CCD (charge coupled device), and the like, the cost of equipment is saved, the acquisition mode can not be contacted with the liquid, and the liquid can be prevented from being polluted. Next, still because the color value extraction portion obtains the color value of awaiting measuring of the liquid that awaits measuring from liquid color image, spectral transmittance rebuilds for corresponding spectral transmittance according to the color value of awaiting measuring, thereby make concentration determination portion can have this spectral transmittance more and determine corresponding concentration, consequently, the liquid spectrum detecting system of this embodiment can be fast (usually in several seconds), and accomplish spectral transmittance's rebuild accurately, and then detect out the concentration of the liquid that awaits measuring, it is faster for traditional liquid concentration detection method speed, the cost is lower, and can also guarantee the high accuracy of detection.
Drawings
FIG. 1 is a block diagram of a liquid concentration detection system in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of an image capturing device according to an embodiment of the present invention;
FIG. 3 is a flow chart of the training of the spectral reconstruction model according to an embodiment of the present invention; and
fig. 4 is a flow chart of the operation of the liquid spectrum detection system in the embodiment of the invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the liquid concentration detection system of the invention is specifically described below with reference to the embodiments and the accompanying drawings.
< example >
Fig. 1 is a block diagram of a liquid concentration detection system in an embodiment of the present invention.
As shown in fig. 1, the liquid concentration detection system 10 includes an image capturing device 11, a color value extracting unit 12, a scheduled solute acquiring unit 13, a spectral transmittance reconstructing unit 14, a concentration determining unit 15, and a control unit 16 for controlling the above units.
Fig. 2 is a schematic structural diagram of an image capturing device in an embodiment of the present invention.
As shown in fig. 1 and 2 (a), the image capturing apparatus 11 includes a plurality of capsule wells 31, a backlight source 32, a guide mechanism 33, and a scanning head 34.
The vessel groove 31 is circular, is made of transparent glass material, and is used for containing liquid to be measured with a preset depth. In addition, as shown in fig. 2 (b), the depth d of each vessel groove 31 is uniform, so that the liquid in the vessel grooves is ensured to have the same color under the conditions of the same concentration and the same predetermined solute.
The backlight source 32 is used to provide a light source for the dish trough 31, so that the scanning head 34 can scan the light passing through the liquid to be measured from the backlight source 32.
The guide rail mechanism 33 is a screw guide rail, and a plurality of vessel grooves 31 arranged in a straight line are provided on a rail surface thereof. The guide rail mechanism 33 is used for guiding the vessel tank 31 to the position of the scanning head 34, so that the scanning head 34 can perform scanning processing on the liquid to be measured in the vessel tank 23 to generate a corresponding liquid acquisition image.
In this embodiment, the scanning head 34 has a transmissive line CCD, and the acquisition of the liquid acquisition image is completed by the transmissive line CCD.
Through the image acquisition device 11, the liquid acquisition image of the liquid to be detected in each vessel groove 31 can be sequentially extracted.
In addition, in this embodiment, the liquid to be measured is a transparent liquid with a known solute but unknown concentration, and the liquid to be measured with different concentrations in the liquid acquisition image can show different colors.
The color value extracting unit 12 is configured to extract a color value of the liquid to be measured in the liquid color image as a color value to be measured.
In this embodiment, the color value is an RGB value, and the color value extraction unit 12 first determines a pixel point corresponding to the liquid to be measured in the liquid collection image, and then reads the RGB value of the pixel point to obtain a color value to be measured corresponding to the liquid to be measured.
The predetermined solute obtaining unit 13 is configured to obtain solute information of a predetermined solute in the solution to be measured.
In this embodiment, the solute information is preset by the operator, for example, the next 10 liquids to be measured are set to contain predetermined solutes which are all certain solute information, and the predetermined solute obtaining unit 13 automatically obtains the set solute information when the scanning head 34 obtains a liquid acquisition image by shooting.
The spectral transmittance reconstruction unit 14 is configured to reconstruct a corresponding spectral transmittance from the color value to be measured as a reconstructed spectral transmittance.
As shown in fig. 1, the spectral transmittance reconstruction unit 14 includes a model storage unit 141, a model determination unit 142, and a spectral reconstruction unit 143.
The model storage unit 141 stores a plurality of pre-trained spectral reconstruction models and corresponding solute information, each spectral reconstruction model corresponding to a predetermined solute. The predetermined solute may be a single substance or a mixture of a plurality of substances, and the ratio of the plurality of substances constituting the mixture may be different. The solute information is an element corresponding to a predetermined solute and a valence state of the element.
In this embodiment, the spectrum reconstruction model is constructed based on a least squares support vector regression model and obtained by training in advance. In this embodiment, the least squares support vector regression model includes a radial basis kernel function.
In this embodiment, different spectral reconstruction models are provided for different predetermined solutes, and these spectral reconstruction models need to be trained by standard liquids of the corresponding predetermined solutes.
FIG. 3 is a flowchart illustrating the training of the spectral reconstruction model according to an embodiment of the present invention.
As shown in fig. 3, the training process of the spectral reconstruction model includes steps S1 to S3, which are as follows:
in step S1, the image capturing device 11 captures an image of a standard liquid with a predetermined solute and different predetermined concentrations to obtain a plurality of standard liquid images.
Step S2, a color value of the standard liquid in the standard liquid image is obtained as a standard color value and a corresponding spectral transmittance is obtained as a standard spectral transmittance.
In this embodiment, the standard color value is obtained by extracting through the color value extracting part 12, and the specific extracting method is the same as the method for extracting the color value to be measured by the color value extracting part 12, and is not repeated here. The standard spectral transmittance is a spectral transmittance obtained by detecting a standard liquid in each vessel well 11 by a spectrometer.
And step S3, training the initial spectrum reconstruction model based on each standard color value and the corresponding standard spectral transmittance until a preset condition is met and the trained spectrum reconstruction model is obtained.
In this embodiment, the standard color values and the corresponding standard spectral transmittances are averagely divided into two data sets with equal data amounts, where one data set is used for training a spectral reconstruction model, that is, a training data set; the other data set is used for testing of the trained spectral reconstruction model, i.e. the test data set.
In addition, the predetermined condition of this embodiment is to train the spectral reconstruction model until a predetermined number of rounds is reached, and the value of the predetermined number of rounds may be 1000.
Through the training process, the spectrum reconstruction model for liquid spectrum detection can be trained, and different spectrum reconstruction models can be trained for liquids to be detected with different predetermined solutes respectively.
When the color value to be measured needs to be reconstructed, the model determining unit 142 first determines a spectral reconstruction model that needs to be corresponding according to the solute information acquired by the predetermined solute acquiring unit 13, and then the spectral reconstruction unit 143 inputs the color value to be measured into the determined spectral reconstruction model to reconstruct the corresponding reconstructed spectral transmittance.
The concentration determining section 15 can determine the concentration of a predetermined solute in the liquid to be measured based on the reconstructed spectral transmittance.
In the present embodiment, the density determination unit 15 includes a relation curve storage unit 151, a relation curve determination unit 152, and a concentration-to-be-measured calculation unit 153.
The relationship curve storage unit 151 stores solute information of various predetermined solutes and corresponding relationship curves between spectral transmittance and concentration. The relationship is obtained in advance by fitting a liquid defining a predetermined solute and concentration and its spectral transmittance.
The relation curve specifying unit 152 specifies a corresponding relation curve from the relation curve storage unit 151 based on the solute information acquired by the predetermined solute acquiring unit 13.
The concentration-to-be-measured calculating unit 153 calculates the concentration to be measured from the reconstructed spectral transmittance and the relationship curve determined by the relationship curve determining unit 152.
Fig. 4 is a flow chart of the operation of the liquid spectrum detection system in the embodiment of the invention.
As shown in fig. 4, the working process of the liquid spectrum detection system specifically includes the following steps:
step T1, the guide rail mechanism 33 guides the vessel slot 31 to the position of the scanning head 34 in turn, and then the process goes to step T2;
step T2, the scanning head 34 performs scanning processing on the liquid to be measured in the capsule groove 23 guided to the lower side of the scanning head 34 to generate a corresponding liquid collection image, and then the process goes to step T3;
step T3, the color value extracting unit 12 is configured to extract a color value of the liquid to be measured in the liquid color image as a color value to be measured, and then enter step T4;
step T4, the predetermined solute obtaining part 13 is configured to obtain solute information of a predetermined solute in the solution to be measured, and then go to step T5;
in step T5, the model determining unit 142 first determines a spectrum reconstruction model that needs to be mapped according to the solute information acquired by the predetermined solute acquiring unit 13, and then proceeds to step T6;
step T6, the spectrum reconstruction unit 143 inputs the color value to be measured into the determined spectrum reconstruction model to reconstruct the corresponding reconstructed spectrum transmittance, and then proceeds to step T7;
step T7, the concentration determination section 15 determines the concentration of a predetermined solute in the liquid to be measured based on the reconstructed spectral transmittance;
in step T8, the control unit 16 determines whether or not to stop the liquid detection process, and if not, the routine proceeds to step T2, and if so, the routine proceeds to an end state.
Examples effects and effects
According to the liquid concentration detecting system that this embodiment provided, because image acquisition device has the household utensils groove that is used for holding the liquid that awaits measuring, thereby set up the light source in a poor light of household utensils bottom and be arranged in carrying out image acquisition to the liquid that awaits measuring in the household utensils groove and obtain the scanning head of liquid color image, consequently, can gather the color image of the liquid that awaits measuring through relatively lower scanning heads of cost such as CCD, the cost of equipment has not only been saved, and such collection mode also can not produce the contact with liquid, can avoid liquid to be contaminated. Next, still because the color value extraction portion obtains the color value of awaiting measuring of the liquid that awaits measuring from liquid color image, spectral transmittance rebuilds for corresponding spectral transmittance according to the color value of awaiting measuring, thereby make concentration determination portion can have this spectral transmittance more and determine corresponding concentration, consequently, the liquid spectrum detecting system of this embodiment can be fast (usually in several seconds), and accomplish spectral transmittance's rebuild accurately, and then detect out the concentration of the liquid that awaits measuring, it is faster for traditional liquid concentration detection method speed, the cost is lower, and can also guarantee the high accuracy of detection simultaneously.
In the embodiment, the image acquisition device is further provided with a guide rail mechanism for guiding the vessel groove to the scanning head, so that the liquid image can be acquired in a streamline manner, and the concentration of the liquid to be detected can be further detected in real time through the color value extraction part, the spectral transmittance reconstruction part and the concentration determination part.
The above-described embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above-described embodiments.
Claims (6)
1. A liquid concentration detection system for performing spectrum detection on a liquid to be detected containing a predetermined solute and detecting a concentration of the predetermined solute in the liquid to be detected, comprising:
the image acquisition device is provided with a plurality of vessel grooves for respectively containing different liquids to be detected, a backlight source arranged at the bottom of the vessel grooves and a scanning head for acquiring images of the liquids to be detected in the vessel grooves so as to obtain corresponding liquid color images;
a color value extracting unit that extracts a color value of the liquid to be measured in the liquid color image as a color value to be measured;
the spectral transmittance reconstruction part is provided with a spectral reconstruction model corresponding to the preset solute and used for reconstructing corresponding spectral transmittance as reconstructed spectral transmittance according to the color value to be measured; and
and a concentration determination unit configured to determine the corresponding concentration as the concentration to be measured from the reconstructed spectral transmittance based on a correspondence relationship between the spectral transmittance and the concentration of the predetermined solute.
2. The liquid concentration detection system according to claim 1, further comprising:
a solute information acquiring section for acquiring solute information of the predetermined solute in the liquid to be measured,
wherein the spectral transmittance reconstruction unit includes:
the model storage unit is used for storing a plurality of spectral reconstruction models which are in one-to-one correspondence with different preset solutes and the solute information corresponding to the preset solutes;
the model determining unit is used for determining a corresponding spectrum reconstruction model according to the acquired solute information; and
and the spectrum reconstruction unit inputs the color value to be detected into the determined spectrum reconstruction model to obtain the corresponding reconstructed spectrum transmittance.
3. The liquid concentration detection system according to claim 2, characterized in that:
wherein the concentration determination section includes:
a relation storage unit that stores a relation between the spectral transmittance and a concentration of each of the predetermined solutes in a liquid and the solute information of the corresponding predetermined solute;
the relation curve determining unit is used for determining the corresponding relation curve according to the acquired solute information; and
and the concentration to be measured calculation unit calculates the concentration to be measured according to the reconstructed spectral transmittance and the determined relation curve.
4. The liquid concentration detection system according to claim 1, characterized in that:
the spectral reconstruction model is obtained in advance through the following training steps:
step S1, acquiring a plurality of standard liquid color images acquired by the image acquisition device by respectively acquiring standard liquids containing the predetermined solute with different concentrations in advance;
step S2, acquiring a color value of the standard liquid in each standard liquid color image as a standard color value and a corresponding spectral transmittance as a standard spectral transmittance;
step S3, training the initial spectrum reconstruction model based on each standard color value and the corresponding standard spectral transmittance until the predetermined condition is met and the trained spectrum reconstruction model is obtained,
the trained spectrum reconstruction model can obtain the corresponding reconstructed spectrum transmittance based on the color value to be detected.
5. The liquid concentration detection system according to claim 4, characterized in that:
wherein the spectrum reconstruction models are multiple and correspond to different predetermined solutes one by one,
the standard liquid is a liquid containing different concentrations of the predetermined solute corresponding to the spectral reconstruction model.
6. The liquid concentration detection system according to claim 1, characterized in that:
wherein the image acquisition device is also provided with a guide rail mechanism,
the guide rail mechanism is used for sequentially conveying the vessel grooves to the scanning head, so that the scanning head can scan the conveyed liquid to be detected to obtain the corresponding liquid color image.
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| JPH08193915A (en) * | 1995-01-19 | 1996-07-30 | Dainippon Printing Co Ltd | Inspection apparatus for color sample |
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