PH measuring device and method based on RGB color model

Abstract

The invention provides a pH measurement device and method based on an RGB color model, and relates to the technical field of pH measurement, the pH measurement device comprises a shading shell assembly, a to-be-measured liquid supporting table, an internal illumination assembly, an automatic liquid supply assembly, a camera shooting assembly and a pH measurement analysis assembly, a detection cavity for containing to-be-measured liquid is formed in the shading shell assembly, and the pH measurement analysis assembly is arranged in the detection cavity. A to-be-detected liquid containing position is planned in the detection cavity, the to-be-detected liquid supporting table is located at the to-be-detected liquid containing position, the internal lighting assemblies are located in the detection cavity and evenly distributed on the periphery of the to-be-detected liquid supporting table, and the automatic liquid supply assembly automatically supplies quantitative acid-base indicator according to to-be-detected liquid. The camera shooting assembly directly faces the to-be-measured liquid supporting table, the pH measurement and analysis assembly is connected with the camera shooting assembly and located on the outer wall of the shading shell assembly, and the distance between the camera shooting assembly and the to-be-measured liquid is 20 cm or above. The pH measuring device and method provided by the invention are beneficial to improving the accuracy of liquid pH measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid pH measurement, and in particular to a pH measurement device and method based on an RGB color model. Background Art

[0002] The pH value is a scale of hydrogen ion activity in a solution and an important representation of the strength of the solution's acidity or alkalinity. As one of the most important water quality parameters, pH measurement is widely used in various fields such as sewage treatment, industrial production, environmental monitoring, food processing, education and scientific research, and aquaculture. Therefore, the measurement of pH is particularly important. At present, the precise measurement of pH mainly adopts the electrode method, such as "GB / T 13580.4-1992 Electrode method for determination of pH value of atmospheric precipitation", "HJ 1147-2020 Electrode method for determination of pH value of water quality", "GB / T 23769-2009 General method for determination of pH value in aqueous solution of inorganic chemical products", etc.

[0003] These methods all use glass electrodes to measure pH, and these methods have at least the following five disadvantages or limitations.

[0004] 1. The glass electrode itself has a very high resistance, which can reach hundreds of megohms. It must be measured with the aid of an electronic amplifier. Its resistance changes with temperature and can generally only be used at 5~60℃.

[0005] 2. When measuring solutions with high acidity (pH < 1) and high alkalinity (pH > 9), the potential response deviates from the ideal linearity, resulting in pH measurement errors, and acid- and alkali-resistant pH electrodes are required for measurement.

[0006] 3. In acidic samples containing high concentrations of fluorine or highly corrosive samples, hydrofluoric acid-resistant or corrosion-resistant pH electrodes (such as polyvinyl chloride membrane electrodes, etc.) should be used for determination.

[0007] 4. When measuring samples of solutions with different electrolyte concentrations, electrodes with different ionic strengths need to be used. The above problems result in the need to use different electrodes for different samples and the electrodes need to be maintained regularly. Generally, the service life of an electrode is about one year. When used in a strong acid, strong alkali, or highly corrosive environment, the life of the electrode may even be shortened to a few weeks to a few months. The calibration cycle of the electrode is generally three months. If the electrode is used in a harsh environment (such as a strong acid, strong alkali, or highly corrosive environment), the calibration cycle needs to be greatly shortened and maintenance is more complicated. On the other hand, the electrode needs to be replaced regularly due to corrosion, resulting in a high cost of use.

[0008] 5. Common pH meters (such as pen pH meters, portable pH meters, laboratory pH meters, etc.) generally have only one measuring electrode and cannot measure the pH of multiple solutions at the same time. Summary of the invention

[0009] The present invention provides a pH measuring device based on an RGB color model, which can avoid the problem of pH measurement errors caused by corrosive substances, high ionic strength substances and the like in a solution when measuring by an electrode method, and can also avoid the acid error, alkali error and other problems of a common electrode method under corrosive, strongly acidic and strongly alkaline solution conditions, thereby significantly improving the accuracy of pH measurement. The measuring device of the present invention is based on the RGB color model, and obtains RGB information of the solution by a camera component, and performs data processing by a microprocessor, and does not need to be in direct contact with the solution, and will not be affected by immersion contact with the measured solution.

[0010] In order to achieve the above-mentioned invention object, the technical solution provided by the present invention is as follows:

[0011] A pH measuring device based on an RGB color model comprises: a light-shielding housing component, wherein the interior of the light-shielding housing component is formed as a detection cavity for accommodating a liquid to be measured, wherein a place for placing the liquid to be measured is planned in the detection cavity, wherein the light-shielding housing component comprises a door panel, wherein the door panel can be opened to close the detection cavity and block external light; a support platform for the liquid to be measured, wherein the support platform for the liquid to be measured is located at the place for placing the liquid to be measured; and an internal lighting component, wherein the internal lighting component is connected to the light-shielding housing component and is located in the detection cavity, wherein the internal lighting component is evenly arranged at the detection cavity. The periphery of the test platform for the liquid to be tested; an automatic liquid supply component, which is connected to the light-shielding shell component and automatically supplies a quantitative acid-base indicator according to the liquid to be tested; a camera component, which is connected to the light-shielding shell component and is located in the detection cavity, and the camera component is directly opposite to the support platform for the liquid to be tested; a pH measurement and analysis component, which is connected to the camera component and is located on the outer wall of the light-shielding shell component, wherein the camera component is spaced more than 20 cm from the liquid to be tested.

[0012] Exemplarily, the support platform for the liquid to be tested is recessed inward from the surface to form at least three places for placing the liquid to be tested, and the places for placing the liquid to be tested are formed to fit the shape of the container for containing the liquid to be tested.

[0013] Exemplarily, the support platform for the liquid to be tested is a square support platform, the container for holding the liquid to be tested is a square box-shaped container, and the supporting surface of the square support platform is recessed inward to form four square grooves as a place to place the liquid to be tested, and the bottom area of ​​the square grooves is not less than the bottom area of ​​the square box-shaped container for holding the liquid to be tested.

[0014] Exemplarily, the automatic liquid supply component includes an acid-base indicator storage, a peristaltic pump and a liquid outlet tube, the acid-base indicator storage is respectively connected to the peristaltic pump and the liquid outlet tube, the acid-base indicator storage and the peristaltic pump are both located in the detection cavity, the liquid outlet tube extends outward from the interior of the acid-base indicator storage until it extends out of the outer wall of the light-shielding shell assembly, and the free end of the liquid outlet tube forms a liquid outlet.

[0015] Exemplarily, the pH measurement and analysis component includes a control panel and panel buttons, the control panel is connected to the light-shielding shell component, the panel buttons are located on the control panel, and the control panel is also provided with a display screen, and the display screen displays at least one of the panel button instructions, the pH measurement data analysis results of the liquid to be tested, the working status of the internal lighting component, and the acid-base indicator amount pumped out by the peristaltic pump.

[0016] Exemplarily, the camera assembly is connected to the control panel and the panel buttons, and the camera assembly is turned on and off by controlling the panel buttons.

[0017] Exemplarily, the internal lighting assembly includes at least three LED light panels parallel to each other, and the three LED light panels are connected to the inner wall of the light-shielding shell assembly at equal intervals and close to where the liquid to be tested is placed.

[0018] Exemplarily, the light-shielding housing assembly is made of a light-shielding material, and is formed into a square box-shaped assembly, one side of which is formed with a square opening, and the door panel can be pulled out to cover the square opening so as to take out and place the solution to be tested by pulling out the door panel.

[0019] The present invention also provides a pH measurement method based on the RGB color model, which is used in any of the above-mentioned measuring devices, comprising: roughly measuring the pretreated solution to be tested with pH test paper to determine the approximate pH range; turning on the power of the measuring device; adding an acid-base indicator according to the approximate pH range; opening the door panel, placing the solution to be tested into the place where the solution to be tested is placed, and closing the door panel; turning on the internal lighting component and the camera component to collect image information of the solution to be tested; analyzing and processing the image information, measuring and displaying the pH value of the solution to be tested; opening the door panel, taking out the measured solution, and closing the measuring device.

[0020] In some embodiments, the measuring device is calibrated once after leaving the factory, including:

[0021] Prepare a series of buffer solutions with pH values ​​between 0 and 14, with a pH interval of 0.2; obtain a fitting equation between pH and RGB information to obtain the following fitting equation: , , Three constants, the fitting equation is .

[0022] The above embodiments have at least the following beneficial effects compared with the prior art:

[0023] In the above embodiment, the RGB information of the solution is obtained by the camera device and the data is processed by the microprocessor. The specific relationship between pH and RGB information (G / (R+G+B)) is obtained by data fitting, and then the pH value of the solution can be obtained through this relationship and the RGB information (G / (R+G+B)) obtained by the measuring device. Therefore, the pH measuring device based on the RGB color model of the above embodiment will not be affected by the measured solution, thereby avoiding the problem of error in pH measurement caused by corrosive substances, high ionic strength substances in the solution during electrode measurement. At the same time, under the conditions of corrosive, strongly acidic and strongly alkaline solutions, the device effectively avoids the acid error, alkali error and other problems of the electrode method, thereby significantly improving the accuracy of pH measurement.

[0024] In some of the above examples, the support platform for the liquid to be tested is recessed inward from the surface to form at least three places for placing the liquid to be tested. That is to say, the measuring device of the above examples can provide more than three measurement areas, and one device can be used to measure the pH of multiple solutions at the same time. This will greatly reduce the pH detection cost and shorten the detection time, which is of great significance to industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a structural schematic diagram of a pH measuring device based on an RGB color model of the present invention;

[0027] Figure 2 The module schematic diagram of the pH measuring device based on the RGB color model of the present invention.

[0028] The accompanying drawings are described as follows:

[0029] pH measurement device based on RGB color model 001,

[0030] Light-shielding shell assembly 100, test liquid support platform 200, internal lighting assembly 300, automatic liquid supply assembly 400, camera assembly 500, pH measurement and analysis assembly 600, light-shielding square box 1, control panel 2, panel buttons 3, LED light board 4, camera 5, acid-base indicator storage 6, peristaltic pump 7, liquid outlet 8, test solution placement place 9, door panel 10, square support platform 11. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the common meanings understood by persons with ordinary skills in the field to which the present invention belongs. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0033] Combination Figure 2 As shown, an embodiment of the present invention provides a pH measuring device 001 based on the RGB color model, including a light-shielding housing assembly 100, a liquid support table 200 to be tested, an internal lighting assembly 300, an automatic liquid supply assembly 400, a camera assembly 500 and a pH measurement and analysis assembly 600.

[0034] The interior of the light-shielding shell assembly is formed as a detection cavity for accommodating the liquid to be tested, and a place for placing the liquid to be tested is planned in the detection cavity. The light-shielding shell assembly 100 includes a door panel, which can be opened to close the detection cavity and block external light. The support platform 200 for the liquid to be tested is located at the place for placing the liquid to be tested. The internal lighting assembly 300 is connected to the light-shielding shell assembly 100 and is located in the detection cavity. The internal lighting assembly 300 is evenly arranged around the detection platform for the liquid to be tested. The automatic liquid supply assembly 400 is connected to the light-shielding shell assembly 100, and the automatic liquid supply assembly 400 automatically supplies a quantitative acid-base indicator according to the liquid to be tested. The camera assembly 500 is connected to the light-shielding shell assembly 100 and is located in the detection cavity. The camera assembly 500 is facing the support platform 200 for the liquid to be tested. The pH measurement and analysis assembly 600 is connected to the camera assembly 500 and is located on the outer wall of the light-shielding shell assembly 100, wherein the camera assembly 500 is spaced more than 20 cm from the liquid to be tested.

[0035] In the pH measuring device 001 based on the RGB color model of the embodiment of the present invention, the camera component 500 is more than 20 centimeters away from the liquid to be measured, and there is no internal structure in direct contact with the solution to be measured, and it will not be affected by the solution to be measured, thereby avoiding the problem of errors in pH measurement caused by corrosive substances, high ionic strength substances in the solution during electrode measurement. At the same time, under the conditions of corrosive, strongly acidic and strongly alkaline solutions, the device effectively avoids the acid error, alkali error and other problems of the electrode method, thereby significantly improving the accuracy of pH measurement.

[0036] In the above embodiment, within the color change range of the acid-base indicator, the RGB information (G / (R+G+B)) changes monotonically with the change of pH, and the two generally have the following relationship through fitting:

[0037]

[0038] in , , The specific relationship between pH and RGB information (G / (R+G+B)) can be obtained through data fitting, and then the pH value of the solution can be obtained through this relationship and the RGB information (G / (R+G+B)) obtained by the device.

[0039] The acid-base indicators required for pH measurement by the pH measuring device 001 based on the RGB color model provided in the above embodiment are as follows:

[0040]

[0041] Table 1 Acid-base indicators required for pH measurement

[0042] In some embodiments, the light-shielding shell assembly 100 can be in the form of a circular shell, a square shell, a multi-faceted special-shaped shell, etc. The shell is made of a light-shielding material, or a light-shielding paint is applied on the shell. The interior of the light-shielding shell assembly 100 is formed with a detection cavity for accommodating the liquid to be tested, and a place for placing the liquid to be tested is planned in the detection cavity. The light-shielding shell assembly 100 includes a door panel, which can be opened to close the detection cavity and block external light. The liquid support platform 200 to be tested is located at the place where the liquid to be tested is placed. The door panel can be set to a flip-cover type, and the door panel is hinged to the shell as a flip-cover.

[0043] The test liquid support platform 200 is recessed from the surface to form at least three test liquid placement locations, and the test liquid placement locations are formed to fit the shape of the test liquid container. Figure 1 Four, five, six or ten places for placing the liquid to be tested can be formed on the surface of the liquid support platform 200 to be tested. That is to say, the pH measuring device of this embodiment can measure four, five, six or ten groups of liquid to be tested at the same time. Therefore, the measuring device of this embodiment can use one device to measure the pH of multiple solutions at the same time, which will greatly reduce the detection cost and shorten the detection time of pH, which is of great significance to industrial production. At the same time, the simultaneity of sample measurement can avoid errors between samples.

[0044] Can be combined Figure 1 In the above embodiment, the support platform 200 for the liquid to be tested is a square support platform 11, and the container for holding the liquid to be tested is a square box-shaped container. The support surface of the square support platform 11 is recessed inward to form four square grooves as a place for placing the liquid to be tested, and the bottom area of ​​the square grooves is not less than the bottom area of ​​the square box-shaped container for holding the liquid to be tested.

[0045] In some embodiments, the automatic liquid supply assembly 400 includes an acid-base indicator reservoir 6, a peristaltic pump 7 and a liquid outlet pipe, the acid-base indicator reservoir is connected to the peristaltic pump 7 and the liquid outlet pipe respectively, the acid-base indicator reservoir 6 and the peristaltic pump 7 are both located in the detection cavity, the liquid outlet pipe extends outward from the inside of the acid-base indicator reservoir until it extends out of the outer wall of the light-shielding housing assembly 100, and the free end of the liquid outlet pipe forms a liquid outlet 8, reference Figure 1 shown.

[0046] In the above embodiment, the pH measurement and analysis component 600 includes a control panel 2 and a panel button 3. The control panel 2 is connected to the light-shielding shell component 100. The panel button 3 is located on the control panel 2. The control panel 2 is also provided with a display screen. The display screen displays at least one of the instructions of the panel button 3, the analysis results of the pH measurement data of the liquid to be tested, the working status of the internal lighting component 300, and the acid-base indicator dose pumped out by the peristaltic pump 7.

[0047] Combination Figure 1The camera assembly 500 may include at least one camera 5, which is connected to the control panel 2 and the panel button 3, and the camera 5 is turned on and off by the panel button 3. Therefore, the pH measuring device of the embodiment of the present invention can directly read the pH measurement data analysis result of the liquid to be measured on the control panel display screen, which is conducive to improving the measurement efficiency.

[0048] In some examples, the internal lighting assembly 300 includes at least three parallel LED light panels 4, which are connected to the inner wall of the light shielding housing assembly 100 at equal intervals and close to where the liquid to be measured is placed. This ensures that the illumination in the pH measuring device is uniform to reduce errors. Figure 1 .

[0049] In addition, combined Figure 1 The light-shielding housing assembly 100 is made of a light-shielding material. The light-shielding housing assembly 100 is formed into a square box-shaped assembly. A square opening is formed on one side of the square box-shaped assembly. The door panel 10 can be pulled out to cover the square opening so that the solution to be tested can be taken out by pulling out the door panel 10.

[0050] In some embodiments, continue to refer to Figure 1 The pH measuring device 001 based on the RGB color model may include a shading square box 1, a control panel display, a panel button 3, an LED fill light, a camera device, an acid-base indicator storage 6, a peristaltic pump 7, a liquid outlet 8, a place for placing the solution to be tested 9, a door panel 10, and a square support table 11. The shading square box 1 is made of an opaque polyethylene plastic plate, which prevents the stray light in the environment from affecting the camera device to reduce the error. The control panel display is a display panel for controlling the peristaltic pump and taking pictures for pH measurement and instrument calibration.

[0051] The panel buttons 3 control the peristaltic pump and take photos for pH measurement and instrument calibration. The LED fill light can also be composed of two parallel LED light panels to ensure that the lighting in the device is uniform to reduce errors. The camera device is a device for the device to obtain the detection signal (i.e., the RGB information in the solution). The acid-base indicator storage 6 is used to store various acid-base indicators required for solution detection, and the peristaltic pump and the peristaltic pump outlet are devices for dripping the appropriate acid-base indicator into the solution to be tested. The place 9 for placing the solution to be tested is the standard position for placing the sample of the solution to be tested, and it is 20 cm away from the camera device. The door panel 10 can be pulled back and forth to take and place the sample.

[0052] In addition, the present invention also provides a pH measurement method based on the RGB color model, which is used in the above-mentioned measuring device and comprises the following steps:

[0053] S100: The pretreated solution to be tested is roughly tested with pH test paper to determine an approximate pH range.

[0054] S200: Turn on the power supply of the measuring device.

[0055] S300: Add acid-base indicator according to the approximate pH range.

[0056] S400: Open the door panel, put the solution to be tested into the place where the solution to be tested is placed, and close the door panel.

[0057] S500: Turn on the internal lighting component and the camera component to collect image information of the solution to be tested.

[0058] S600: Analyze and process image information, measure and display the pH value of the solution to be tested.

[0059] S700: Open the door, take out the measured solution, and close the measuring device.

[0060] In the above embodiment, the measuring device may be calibrated at least once after leaving the factory, including:

[0061] S10: preparing a series of buffer solutions with a pH value ranging from 0 to 14, wherein the pH interval of the buffer solutions is 0.2.

[0062] S20: Obtain a fitting equation between pH and RGB information to obtain the following fitting equation: , , Three constants, the fitting equation is .

[0063] It should be noted that the calibration operation does not need to be performed every time a measurement is made. It is sufficient to calibrate once after leaving the factory. The purpose is to obtain the value of the fitting equation between pH and RGB information. , , Three constants. Of course, if the relevant parameters are lost, a second calibration can be performed as long as the accuracy of the measurement results can be guaranteed.

[0064] It should be understood that, although the various steps are arranged in sequence according to the description, these steps are not necessarily performed in sequence according to the order indicated or marked. Unless clearly stated herein, the execution of these steps is not strictly limited in order, and they can be performed in other orders. Moreover, at least a portion of the steps in the step flow may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and the execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0065] In the above embodiment, step S100: the pre-treated solution to be tested is roughly tested with pH test paper to determine the approximate pH range. For water samples with impurities or colored solutions and solutions containing interfering substances such as oil, suspended matter, etc., physical or chemical means should be used to eliminate the interfering substances and ensure that the solution is basically colorless to ensure the accuracy of the measurement results.

[0066] In a further embodiment, in combination Figure 1 The measuring device comprises a light-shielding square box 1, a control panel 2, a panel button 3, an LED fill light, a camera device, an acid-base indicator storage 6, a peristaltic pump 7, a liquid outlet 8, a place for placing a solution to be measured 9, a door panel 10, and a square support table 11.

[0067] Specific combination Figure 1 The pH measurement method of the measuring device comprises the following steps:

[0068] 1. Use pH test paper to roughly measure the solution to be tested and determine the approximate pH range.

[0069] 2. Connect the power supply of the device and turn on the device switch.

[0070] 3. Add the solution to be tested into the polypropylene square box, use the control button to select the indicator function and select the approximate pH range of the solution. Place the solution to be tested under the outlet of the peristaltic pump, select the indicator function, and the peristaltic pump will add 0.1 mL of the corresponding acid-base indicator to the solution to be tested.

[0071] 4. Use the control button to select the LED fill light interface. Open the door panel, put the solution to be tested into the place where the solution to be tested is placed, and close the door panel.

[0072] 5. Use the control button to select the pH measurement function and perform pH measurement. The pH of the solution to be tested will be displayed on the control panel display, and the measurement is completed.

[0073] 6. After the measurement is completed, open the door, take out the measured solution, and close the door. Use the control button to return to the initial interface, turn off the LED fill light, and turn off the instrument.

[0074] As mentioned above, the pH measurement method based on the RGB color model can realize the "contactless" measurement of pH in the solution by using the device of the present invention, can realize the accurate measurement of pH of high-fluorine solution, and effectively avoids the problems of "acid difference" and "base difference" of the glass electrode method, thereby significantly improving the accuracy of pH measurement. The ordinary LED optical equipment used reduces the instrument cost of the detection; at the same time, it realizes the simultaneous measurement of pH of multiple groups of solutions, reducing the error between samples; at the same time, it avoids the problem of regular maintenance of pH electrodes in the electrode method, so it has strong practicality and convenience.

[0075] There are a few points to note:

[0076] (1) The drawings of the embodiments of the present invention only involve structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0077] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of layers or regions are enlarged or reduced, that is, these drawings are not drawn according to the actual scale.

[0078] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0079] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A pH measuring device based on RGB color model, characterized in that: include: A light-shielding housing assembly, wherein the interior of the light-shielding housing assembly is formed with a detection cavity for accommodating a liquid to be detected, wherein a place for placing the liquid to be detected is planned in the detection cavity, and the light-shielding housing assembly includes a door panel, wherein the door panel can be opened to close the detection cavity and block external light; A support platform for the liquid to be tested, wherein the support platform for the liquid to be tested is located where the liquid to be tested is placed; An internal lighting component, the internal lighting component is connected to the light shielding housing component and is located in the detection cavity, and the internal lighting component is evenly arranged around the detection platform of the liquid to be detected; An automatic liquid supply component, the automatic liquid supply component is connected to the light-shielding housing component, and the automatic liquid supply component automatically supplies a quantitative acid-base indicator according to the liquid to be tested; A camera assembly, the camera assembly is connected to the light shielding housing assembly and is located in the detection cavity, the camera assembly is facing the liquid support platform to be detected; A pH measurement and analysis component is connected to the camera component and is located on the outer wall of the light-shielding shell component, wherein the camera component is spaced more than 20 centimeters from the liquid to be measured.

2. The pH measuring device based on the RGB color model according to claim 1, characterized in that: The support platform for the liquid to be tested is recessed inward from the surface to form at least three places for placing the liquid to be tested, and the places for placing the liquid to be tested are formed to be adapted to the shape of the container for containing the liquid to be tested.

3. The pH measuring device based on the RGB color model according to claim 2, characterized in that: The support platform for the liquid to be tested is a square support platform, and the container for holding the liquid to be tested is a square box-shaped container. The support surface of the square support platform is recessed inward to form four square grooves as a place for placing the liquid to be tested, and the bottom area of ​​the square grooves is not less than the bottom area of ​​the square box-shaped container for holding the liquid to be tested.

4. The pH measuring device based on the RGB color model according to claim 1, characterized in that: The automatic liquid supply component includes an acid-base indicator storage, a peristaltic pump and a liquid outlet tube. The acid-base indicator storage is connected to the peristaltic pump and the liquid outlet tube respectively. The acid-base indicator storage and the peristaltic pump are both located in the detection cavity. The liquid outlet tube extends outward from the inside of the acid-base indicator storage until it extends out of the outer wall of the light-shielding shell assembly, and the free end of the liquid outlet tube forms a liquid outlet.

5. The pH measuring device based on the RGB color model according to claim 4, characterized in that: The pH measurement and analysis component includes a control panel and panel buttons. The control panel is connected to the light-shielding shell component. The panel buttons are located on the control panel. The control panel is also provided with a display screen. The display screen displays at least one of the panel button instructions, the pH measurement data analysis results of the liquid to be tested, the working status of the internal lighting component, and the acid-base indicator dose pumped out by the peristaltic pump.

6. The pH measuring device based on the RGB color model according to claim 5, characterized in that: The camera assembly is connected to the control panel and the panel buttons, and the camera assembly is turned on and off by the panel buttons.

7. The pH measuring device based on the RGB color model according to claim 1, characterized in that: The internal lighting assembly includes at least three LED light panels parallel to each other. The three LED light panels are connected to the inner side wall of the light shielding shell assembly at equal intervals and are close to the location where the liquid to be tested is placed.

8. The pH measuring device based on the RGB color model according to claim 1, characterized in that: The light-shielding housing component is made of light-shielding material and is formed into a square box-shaped component. A square opening is formed on one side of the square box-shaped component. The door panel can be pulled out to cover the square opening so that the solution to be tested can be taken out by pulling out the door panel.

9. A pH measurement method based on RGB color model, used in the measuring device according to any one of claims 1 to 8, characterized in that: include: Use pH test paper to roughly test the pretreated solution to determine the approximate pH range; Turning on the power supply of the measuring device; Adding an acid-base indicator according to the approximate pH range; Open the door panel, put the solution to be tested into the place where the solution to be tested is placed, and close the door panel; Turning on the internal lighting component and the camera component to collect image information of the solution to be tested; Analyze and process image information, measure and display the pH value of the solution to be tested; Open the door panel, take out the measured solution, and close the measuring device.

10. The pH measurement method based on the RGB color model according to claim 9, characterized in that: The measuring device is calibrated once after leaving the factory, including: A series of buffer solutions with a pH value between 0 and 14 are prepared, wherein the pH interval of the buffer solutions is 0.2; Get the fitting equation between pH and RGB information to get the following fitting equation , , Three constants, the fitting equation is .

Images