Liquid concentration measuring device

Abstract

The utility model discloses a liquid concentration measuring device. The liquid concentration measuring device comprises a laser, an optical fiber sensor, an optical power meter and a computer, the optical power meter is connected with a receiving end of the optical fiber sensor, the optical power meter is connected with the computer, and the optical fiber sensor is placed in a solution to be detected; light waves emitted by the laser sequentially pass through the incident end of the optical fiber sensor, the solution to be detected and the receiving end of the optical fiber sensor, and the optical power meter is used for converting transmission light signals output by the receiving end into electric signals and sending the electric signals to the computer; the computer is used for processing the electric signal to obtain the concentration of the solution to be detected. The structure can be simplified under the condition that the measurement precision of the liquid concentration is guaranteed, and the operation convenience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of liquid concentration measurement, and in particular to a liquid concentration measuring device. Background Art

[0002] Accurately measuring the concentration of transparent liquids plays a vital role in industrial production, food processing, medical diagnosis, water quality monitoring, wastewater treatment, and basic scientific research. Numerous methods exist for measuring liquid concentration, including refractometry, spectroscopy, ion-selective electrodes (ISEs), pH meters, ultrasonic densitometers, and high-performance liquid chromatography (HPLC). However, these methods often suffer from bulky structures, complex operation, high cost, and high maintenance costs. Furthermore, their use in harsh working environments, such as those with strong corrosion, flammability, and explosion, is limited.

[0003] Therefore, the existing technology still needs to be improved and developed. Utility Model Content

[0004] The main purpose of the present application is to provide a liquid concentration measuring device, which aims to solve the problem in the prior art that the liquid concentration detection equipment has a bulky structure and causes the liquid concentration detection operation to be cumbersome.

[0005] An embodiment of the present application provides a liquid concentration measuring device, wherein the liquid concentration measuring device includes a laser, an optical fiber sensor, an optical power meter and a computer; the optical power meter is connected to the receiving end of the optical fiber sensor, the optical power meter is connected to the computer, and the optical fiber sensor is placed in a solution to be measured; the light wave emitted by the laser passes through the incident end of the optical fiber sensor, the solution to be measured and the receiving end of the optical fiber sensor in sequence, the optical power meter is used to convert the transmitted light signal output by the receiving end into an electrical signal, and send the electrical signal to the computer, and the computer is used to process the electrical signal to obtain the concentration of the solution to be measured.

[0006] In a possible implementation, the optical fiber sensor includes two optical fiber collimators and a liquid groove; the two optical fiber collimators are placed in the liquid groove, and the two optical fiber collimators are respectively used to modulate outgoing light and receive incident light.

[0007] In a possible implementation, the two optical fiber collimators are respectively located at two ends of the liquid groove, and the width of the liquid groove is the same as the working distance between the end faces of the two optical fiber collimators.

[0008] In a possible implementation, the working distance is within 2 mm.

[0009] In one possible embodiment, both of the two fiber optic collimators include an optical fiber core, a glass sleeve, a capillary and an optical lens; the capillary is sleeved in the glass sleeve, one end of the optical fiber core is arranged in the capillary through the glass sleeve, one end of the optical lens is sleeved in the glass sleeve, and one end of the optical fiber core is arranged opposite to one end of the optical lens.

[0010] In one possible embodiment, the optical fiber core of one optical fiber collimator serves as the incident end of the optical fiber sensor, and the optical fiber core of the other optical fiber collimator serves as the receiving end of the optical fiber sensor; the solution to be tested is located between the optical lens of one optical fiber collimator and the optical lens of the other optical fiber collimator.

[0011] In one possible embodiment, the laser includes a total reflection mirror, a condensing mirror, a partial reflection mirror and a pumping system, there is a working material between the total reflection mirror and the condensing mirror, the total reflection mirror, the condensing mirror and the partial reflection mirror are installed on the shell in sequence, and the pumping system is installed on the shell.

[0012] In a possible implementation, the partial reflector is disposed opposite to the optical fiber core of the optical fiber collimator; the laser emitted by the partial reflector passes through the optical fiber core of the optical fiber collimator and irradiates the solution to be tested.

[0013] Beneficial effect: The present application provides a liquid concentration measuring device, in which an optical fiber sensor is sensitive to liquid concentration and can detect weak changes in light intensity. The optical fiber sensor is placed in the solution to be measured. As the liquid concentration changes, the light energy absorbed by the liquid and the intensity of the transmitted light through the liquid will also change accordingly. The light intensity signal is converted into an electrical signal through a photoelectric detector (optical power meter). The measured electrical signal result is fitted with the actual concentration to achieve the measurement of the liquid concentration, thereby simplifying the structure and improving the convenience of operation while ensuring the measurement accuracy of the liquid concentration.

[0014] In addition to the technical problems solved by the present application, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the liquid concentration measuring device provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic structural diagram of a preferred embodiment of the liquid concentration measuring device of the present application;

[0017] Figure 2 This is a schematic structural diagram of an optical fiber sensor of a preferred embodiment of the liquid concentration measuring device of the present application;

[0018] Figure 3 This is a structural diagram of a fiber optic collimator of a preferred embodiment of the liquid concentration measuring device of the present application.

[0019] Description of reference numerals:

[0020] 10. Laser; 20. Fiber optic sensor; 30. Optical power meter; 40. Computer;

[0021] 11. Total reflection mirror; 12. Condenser; 13. Partial reflection mirror; 14. Pump system; 15. Working material; 141. Pulsed xenon lamp; 142. Triggering device; 143. Energy storage capacitor; 144. High-voltage charging power supply;

[0022] 21. Fiber optic collimator; 22. Liquid groove; 211. Fiber optic core; 212. Glass sleeve; 213. Capillary tube; 214. Optical lens.

[0023] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and effects of this application clearer and more explicit, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] For ease of understanding, the application scenarios of the embodiments of the present application are first introduced. The present application can accurately measure the concentrations of different pollutants in water bodies, such as heavy metal ions, organic pollutants, etc., and provide reliable data support for water quality assessment, pollution source tracking and pollution early warning; in the biomedical field, the concentration control of drug solutions is crucial for drug efficacy evaluation, drug development and clinical treatment. The present application can be used to measure the concentration of specific components in biological samples (such as blood and urine), as well as the concentration changes of drug solutions in in vitro experiments, providing an important basis for drug screening; in the chemical production process, the concentration control of raw materials and products directly affects production efficiency, product quality and cost control. The present application can be used to monitor the concentration changes of reactants in the reactor in real time, helping engineers to adjust process parameters in a timely manner, optimize the production process, and improve product quality and output.

[0026] In response to the problem mentioned above that the liquid concentration detection equipment in the related art has a bulky structure, which makes the liquid concentration detection operation cumbersome, the present application provides a liquid concentration measuring device, in which the optical fiber sensor is sensitive to the liquid concentration and can detect weak light intensity changes. The optical fiber sensor is placed in the solution to be tested. As the liquid concentration changes, the light energy absorbed by the liquid and the intensity of the transmitted light through the liquid will also change accordingly. The light intensity signal is converted into an electrical signal through a photoelectric detector (optical power meter). The measured electrical signal result is fitted with the actual concentration to achieve the measurement of the liquid concentration, thereby simplifying the structure and improving the convenience of operation while ensuring the measurement accuracy of the liquid concentration. Thus, the technical problem of the bulky structure of the liquid concentration detection equipment in the related art, which makes the liquid concentration detection operation cumbersome, is solved.

[0027] This application is based on the propagation characteristics of light waves in optical fibers and the Beer-Lambert Law, which describes that when light propagates through a medium, its intensity decays exponentially with increasing medium concentration and optical path length. A fiber collimator is used to collimate the light emitted from the optical fiber into parallel light. The concentration of the liquid is inferred by measuring the attenuation of the light after propagation through the liquid.

[0028] The following specific embodiments are used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0029] like Figure 1As shown, an embodiment of the present application provides a liquid concentration measuring device, which includes a laser 10, an optical fiber sensor 20, an optical power meter 30 and a computer 40; the optical power meter 30 is connected to the receiving end of the optical fiber sensor 20, the optical power meter 30 is connected to the computer 40, and the optical fiber sensor 20 is placed in the solution to be measured; the light wave emitted by the laser 10 passes through the incident end of the optical fiber sensor 20, the solution to be measured and the receiving end of the optical fiber sensor 20 in sequence, the optical power meter 30 is used to convert the transmitted light signal output by the receiving end into an electrical signal, and send the electrical signal to the computer 40, and the computer 40 is used to process the electrical signal to obtain the concentration of the solution to be measured.

[0030] Specifically, based on the propagation characteristics of light waves in optical fibers and the Beer-Lambert law, the present invention utilizes a fiber optic sensor 20 that is sensitive to liquid concentration and can detect even subtle changes in light intensity. By placing the fiber optic sensor 20 in the solution to be measured, as the liquid concentration changes, the light energy absorbed by the liquid and the intensity of the light transmitted through the liquid also change accordingly. A photodetector (i.e., an optical power meter 30) converts the light intensity signal into an electrical signal. A computer 40 then matches the measured electrical signal to the actual concentration, thereby enabling the measurement of the liquid concentration.

[0031] In one embodiment of the present application, the fiber optic sensor 20 includes two fiber optic collimators 21 and a liquid groove 22; the two fiber optic collimators 21 are placed in the liquid groove 22, and the two fiber optic collimators 21 are used to modulate the outgoing light and receive the incident light respectively.

[0032] Specifically, such as Figure 2 As shown, the fiber optic sensor 20 includes a liquid groove 22 and two fiber collimators 21 fixed therein. A six-dimensional transfer stage is used to precisely align the two fiber collimators 21 and secure them within the specially designed liquid groove 22, thereby providing a fiber optic sensor 20 capable of providing a large-area parallel light beam. The laser 10 is used to provide light waves of a specific wavelength. The liquid groove 22 is used to hold test solutions of varying concentrations. The two fiber collimators 21 are respectively used to provide incident light into the test solution and receive transmitted light through the liquid. An optical power meter 30 converts the transmitted light signal into an electrical signal, which is then connected to a computer 40 for auxiliary calculations using specialized software to achieve efficient collection and processing of experimental data.

[0033] It can be understood that the fiber collimator 21 uses a lens to collimate the light emitted by the optical fiber into parallel light based on the refraction and reflection of light, or focuses the parallel light and couples it into the optical fiber to achieve precise modulation and directional transmission of the optical signal, avoiding excessive energy loss or large changes in energy during the change of the optical path.

[0034] It can be understood that a Gaussian beam with a large emission angle emitted from the end face of the optical fiber is incident on the optical lens plane at a certain distance. After the change of the optical lens, it becomes an approximately parallel beam with a very small emission angle, thereby achieving the purpose of beam collimation.

[0035] Furthermore, there are fiber collimators 21 and liquid grooves 22 at both ends. The main functions of the fiber collimators 21 on the left and right ends are to modulate the outgoing light and receive the incident light, respectively, while the main function of the liquid groove 22 is to fix the fiber collimators 21 with their end faces aligned at a short working distance (2mm). The liquid groove 22 is made of stainless steel with high chemical stability to minimize experimental errors caused by additional chemical reactions. This sensor design that uses a liquid groove 22 to fix the fiber collimator 21 instead of an optical fiber can effectively solve the problem of the laser beam being easily deviated when passing directly through the two optical fiber end faces.

[0036] The present application analyzes the linear relationship between the concentration, refractive index and absorbance of a liquid of known concentration, uses a fiber optic collimator 21 to collimate the light emitted by the optical fiber into parallel light, and obtains information on the liquid concentration in reverse through changes in light reflection and attenuation, thereby simplifying the structure and improving the convenience of operation while ensuring the measurement accuracy of the liquid concentration.

[0037] In one embodiment of the present application, the two optical fiber collimators 21 are respectively located at two ends of the liquid groove 22 , and the width of the liquid groove 22 is the same as the working distance between the end faces of the two optical fiber collimators 21 .

[0038] In one embodiment of the present application, the working distance is within 2 mm.

[0039] Specifically, the liquid groove 22 plays a positioning and fixing role, ensuring that the fiber optic collimators 21 on both sides can be positioned relative to each other in a very precise manner, and the distance between them is strictly controlled at a short distance of 2 mm. The working distance of 2 mm refers to the effective working gap between the end faces of the two fiber optic collimators 21, that is, the distance during the transmission of light waves, which is emitted from the fiber optic collimator 21 on one side, passes through the solution to be tested in the liquid groove 22, and is then received by the fiber optic collimator 21 on the other side. This distance directly affects the transmission efficiency of light waves and the absorption and scattering characteristics of the solution to be tested of light waves. In addition, the liquid groove 22 is made of stainless steel with high chemical stability to ensure that no errors are introduced due to additional chemical reactions during the experiment, thereby further improving the accuracy and reliability of the experiment.

[0040] It is understandable that the structural design or material of the optical fiber sensor 20 can be adjusted according to the characteristics of different liquids.

[0041] It should be noted that in traditional fiber optic connections or fiber optic sensor 20 designs, when the end faces of two optical fibers are directly docked, due to slight unevenness of the fiber end faces, slight deviations of the fiber axis or the influence of the external environment (such as temperature and pressure changes), the laser beam may deviate from the predetermined path during transmission, resulting in loss of optical signals or measurement errors. The design of the present application of "using a liquid groove 22 to fix the fiber collimator 21 instead of an optical fiber" cleverly circumvents this problem. In this design, the fiber collimators 21 are installed on both sides of the liquid groove 22, and the relative position and distance between them are ensured by the precise design and manufacture of the liquid groove 22. The fiber collimator 21 itself has the function of collimating the light waves emitted by the optical fiber into parallel light, which means that after leaving the fiber collimator 21, the light beam will maintain parallel transmission within a certain range until it is received by the fiber collimator 21 on the other side; because the liquid groove 22 provides stable support and positioning, the two fiber collimators 21 can maintain a precise relative position, thereby avoiding the problem of deviation of the laser beam during transmission; in addition, the liquid groove 22 can also serve as a container for the solution to be tested, so that the light wave can pass through the solution and be captured by the fiber collimator 21 at the receiving end, thereby realizing the measurement of the properties of the solution to be tested. Therefore, this design method not only improves the measurement accuracy and stability of the optical fiber sensor 20, but also simplifies the structure and operation process of the experimental device, making the experimental data more reliable and easy to process.

[0042] In one embodiment of the present application, Figure 3 As shown, the two optical fiber collimators 21 each include an optical fiber core 211, a glass sleeve 212, a capillary 213 and an optical lens 214; the capillary 213 is sleeved in the glass sleeve 212, one end of the optical fiber core 211 is arranged in the capillary 213 through the glass sleeve 212, one end of the optical lens 214 is sleeved in the glass sleeve 212, and one end of the optical fiber core 211 is arranged opposite to one end of the optical lens 214.

[0043] Specifically, a lens is a transparent optical component composed of one or more pieces of curved (usually spherical) optical glass.

[0044] The present application achieves high-precision docking between optical fibers by designing a specific optical fiber probe and liquid groove 22, reduces light loss, and solves the problem of deviation of laser light when passing through two sections of optical fiber. The present application utilizes the combination of an optical fiber collimator 21 and an optical power meter 30 to achieve efficient coupling between the optical fiber sensor 20 and the photodetector, thereby improving the efficiency of optical signal transmission and measurement accuracy. The present application uses an optical fiber collimator 21 to generate a highly collimated light beam. Compared with traditional light sources and transmission methods, this method can provide a more stable and uniform light field, thereby improving measurement accuracy. The present application applies the Beer-Lambert law to the optical fiber sensor 20, and determines the liquid concentration by measuring the change in the transmitted light intensity. This method is more accurate and sensitive than traditional refractometry and spectroscopy. The present application has a simple structure, low cost, and is easy to carry and operate, making the experimental device not only suitable for laboratory environments, but also for rapid on-site detection. The present application can achieve dynamic measurement of the concentration of transparent liquids, which is of great significance for real-time monitoring and control.

[0045] In one embodiment of the present application, the optical fiber core 211 of one optical fiber collimator 21 serves as the incident end of the optical fiber sensor 20, and the optical fiber core 211 of another optical fiber collimator 21 serves as the receiving end of the optical fiber sensor 20; the solution to be tested is located between the optical lens of one optical fiber collimator 21 and the optical lens of the other optical fiber collimator 21.

[0046] In one embodiment of the present application, Figure 1 As shown, the laser 10 includes a total reflection mirror 11, a condensing mirror 12, a partial reflection mirror 13 and a pumping system 14. There is a working material 15 between the total reflection mirror 11 and the condensing mirror 12. The total reflection mirror 11, the condensing mirror 12 and the partial reflection mirror 13 are installed on the shell in sequence, and the pumping system 14 is installed on the shell.

[0047] Specifically, the pumping system 14 includes a pulse xenon lamp 141 , a triggering device 142 , an energy storage capacitor 143 and a high-voltage charging power supply 144 . The high-voltage charging power supply 144 and the energy storage capacitor 143 are connected to the pulse xenon lamp 141 and the triggering device 142 , respectively.

[0048] In one embodiment of the present application, the partial reflector 13 is arranged opposite to the optical fiber core 211 of the optical fiber collimator 21; the laser emitted by the partial reflector 13 passes through the optical fiber core 211 of the optical fiber collimator 21 and irradiates the solution to be tested.

[0049] This application introduces multimode optical fiber combined with advanced models for image processing. By utilizing the characteristics of multimode optical fiber that can not only transmit optical signals but also capture rich image information through its complex internal mode structure, an image sensing system based on multimode optical fiber is constructed to achieve high-resolution imaging of liquid samples. Subsequently, through deep learning methods, neural networks are trained using MMF input-output data pairs to simulate the image transmission behavior of multimode optical fiber. These models can automatically learn the complex relationship between liquids of different concentrations and image features, and continuously optimize their prediction capabilities as the training data increases. Once the model training is completed, it can quickly and accurately infer the concentration of the liquid from the image, realize real-time measurement of liquid concentration, and extract key features in the image, such as color, texture, morphology, etc., providing a richer data basis for subsequent concentration measurements.

[0050] It should be noted that the present application combines the customized design of the optical fiber sensor 20 with the application of the optical fiber collimator 21, and realizes high-precision light beam docking and transmission through the design of a specific optical fiber probe and a liquid groove 22. By utilizing the optimized coupling technology of optical fiber and photodetector, combined with the innovative application of Beer-Lambert's law, high-precision measurement of transmitted light intensity is achieved. The present application combines the collimated light beam generated by the optical fiber collimator 21 with the application of Beer-Lambert's law to form a high-precision measurement system. The present application combines a portable, low-cost design with real-time dynamic detection capabilities, making the device suitable for field environments that require rapid response. The present application integrates the customized design of the optical fiber sensor 20, the optimized coupling of optical fiber and photodetector, and the real-time dynamic detection capabilities to form an efficient, sensitive and user-friendly measurement system.

[0051] Next, a liquid concentration measuring method based on a liquid concentration measuring device described in any one of the above-mentioned solutions according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0052] The liquid concentration measuring method comprises:

[0053] In step S101 , the laser emits light waves to the optical fiber sensor, wherein the optical fiber sensor is placed in a solution to be tested.

[0054] In step S102 , the optical fiber sensor outputs the light wave passing through the solution to be tested as a transmitted light signal.

[0055] In one possible implementation, a fiber optic collimator collimates the passing light wave to obtain parallel light; after the parallel light passes through the solution to be tested in the solution groove, another fiber optic collimator collimates the passing parallel light to obtain a transmitted light signal.

[0056] In step S103 , the optical power meter converts the transmitted light signal into an electrical signal.

[0057] In step S104 , the computer processes the electrical signal to obtain the concentration of the solution to be tested.

[0058] The following is a further description of the liquid concentration measurement method of the present application through specific examples:

[0059] Concentration measurement: Place the test solutions of different concentrations into the liquid groove in sequence and record the electrical signal output by the optical power meter at each concentration.

[0060] Data fitting: Using a computer and dedicated software, the measured electrical signal results are fitted with the known liquid concentration to establish a corresponding relationship between the concentration and the electrical signal.

[0061] Concentration inversion: In practical applications, by measuring the transmitted light signal of a liquid of unknown concentration and based on the established correspondence, the concentration of the liquid can be inferred.

[0062] Verification experiment: Verify the accuracy and reliability of the measuring device by comparing the measurement results of liquids of known concentration with the true value.

[0063] Optimization and adjustment: Based on the verification results, make necessary adjustments and optimizations to the experimental device to improve measurement accuracy and stability.

[0064] The liquid concentration measurement method provided in this application is applied to the above-mentioned liquid concentration measurement device, thereby having all the beneficial effects of the above-mentioned liquid concentration measurement device, which will not be repeated here.

[0065] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0066] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0068] It should be noted that, in this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0069] The terms "first," "second," "third," "fourth," etc. (if any) in the specification and claims of the present application and in the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that the numbers used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or apparatus.

[0070] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid concentration measuring device, characterized in that: The liquid concentration measuring device includes a laser, an optical fiber sensor, an optical power meter and a computer; The optical power meter is connected to the receiving end of the optical fiber sensor, the optical power meter is connected to the computer, and the optical fiber sensor is placed in the solution to be tested; The light waves emitted by the laser pass through the incident end of the optical fiber sensor, the solution to be tested, and the receiving end of the optical fiber sensor in sequence. The optical power meter is used to convert the transmitted light signal output by the receiving end into an electrical signal and send the electrical signal to the computer. The computer is used to process the electrical signal to obtain the concentration of the solution to be tested.

2. The liquid concentration measuring device according to claim 1, characterized in that: The optical fiber sensor includes two optical fiber collimators and a liquid groove; The two optical fiber collimators are placed in the liquid groove, and the two optical fiber collimators are used to modulate the outgoing light and receive the incident light respectively.

3. The liquid concentration measuring device according to claim 2, characterized in that: The two optical fiber collimators are respectively located at two ends of the liquid groove, and the width of the liquid groove is the same as the working distance between the end faces of the two optical fiber collimators.

4. The liquid concentration measuring device according to claim 3, characterized in that: The working distance is within 2 mm.

5. The liquid concentration measuring device according to claim 3, characterized in that: The two optical fiber collimators each include an optical fiber core, a glass sleeve, a capillary tube and an optical lens; The capillary is sleeved in the glass sleeve, one end of the optical fiber core is arranged in the capillary through the glass sleeve, one end of the optical lens is sleeved in the glass sleeve, and one end of the optical fiber core is arranged opposite to one end of the optical lens.

6. The liquid concentration measuring device according to claim 5, characterized in that: The optical fiber core of one optical fiber collimator serves as the incident end of the optical fiber sensor, and the optical fiber core of the other optical fiber collimator serves as the receiving end of the optical fiber sensor; the solution to be measured is located between the optical lens of one optical fiber collimator and the optical lens of the other optical fiber collimator.

7. The liquid concentration measuring device according to claim 6, characterized in that: The laser includes a total reflection mirror, a condensing mirror, a partial reflection mirror and a pumping system. There is a working material between the total reflection mirror and the condensing mirror. The total reflection mirror, the condensing mirror and the partial reflection mirror are sequentially mounted on a shell. The pumping system is mounted on the shell.

8. The liquid concentration measuring device according to claim 7, characterized in that: The partial reflector is arranged opposite to the optical fiber core of the optical fiber collimator; The laser light emitted by the partial reflector passes through the optical fiber core of the optical fiber collimator and irradiates the solution to be tested.

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