Liquid water beam refractive index detection method and system

Abstract

The invention provides a liquid water beam refractive index detection method and detection system, the detection system comprises a to-be-detected pool, the to-be-detected pool comprises a containing cavity, the containing cavity contains to-be-detected liquid, the to-be-detected pool comprises a first communication part and a second communication part, and the containing cavity is communicated with the external environment through the first communication part and the second communication part; the second communication part is used for leading out the to-be-detected liquid in the accommodating cavity so as to form a liquid water beam; the detection light source is used for sending detection light into the to-be-detected pool; the reflecting mirror is used for receiving and reflecting the detection light; the detector is arranged below the to-be-detected pool; the detector is used for detecting optical power; and the controller determines the refractive index of the to-be-detected liquid based on the optical power. The detection system can detect the real-time refractive index of the liquid in the flowing state, and compared with an existing detection method, the sampling and standing time is effectively shortened, the detection rate is increased, and the technical problem that the refractive index of the flowing liquid cannot be detected through the existing detection method is solved.

Description

Technical Field

[0001] This application relates to the field of refractive index detection technology, and in particular to a method and system for detecting the refractive index of a liquid water jet. Background Technology

[0002] Refractive index is a key physical parameter characterizing the optical properties of liquids and has significant applications in various fields such as chemical analysis, biosensing, environmental monitoring, industrial process control, and food safety. For example, in chemical production processes, real-time monitoring of the refractive index of liquids flowing in pipelines is crucial for controlling reaction concentrations and ensuring product quality.

[0003] However, existing methods for detecting the refractive index of liquids are mainly applicable to static or steady-state liquids. When dealing with flowing liquids, it is necessary to sample and allow the flowing liquid to settle before detection can be performed. Therefore, it is difficult to perform effective and accurate real-time detection of flowing liquids, which seriously affects the detection rate. Summary of the Invention

[0004] This application provides a method and system for detecting the refractive index of a liquid water jet, in order to solve the technical problems of existing methods being unable to perform real-time refractive index detection of flowing liquids and having a low detection rate.

[0005] The first aspect of this application provides a liquid water jet refractive index detection system, comprising a test cell, which includes a receiving cavity containing a liquid to be tested. The test cell includes a first connecting portion and a second connecting portion, and the receiving cavity is connected to the external environment through the first and second connecting portions. The first connecting portion is configured to inject the liquid to be tested into the receiving cavity, and the second connecting portion is configured to discharge the liquid to be tested from the receiving cavity to form a liquid water jet. The cross-sectional area of ​​the second connecting portion varies along the flow direction of the liquid water jet. A detection light source is configured to send detection light into the test cell. A reflector is disposed within the receiving cavity to receive the detection light and reflect it into the liquid water jet. The detection light undergoes total internal reflection within the liquid water jet. A detector is disposed below the test cell and opposite the second connecting portion. The detector is configured to detect the optical power of the detection light in the liquid water jet. A controller determines the refractive index of the liquid to be tested in the flowing state based on the optical power.

[0006] In some feasible implementations, the second connecting part includes a first sub-connecting part and a second sub-connecting part, with the first sub-connecting part located between the receiving cavity and the second sub-connecting part; along the flow direction of the liquid water jet, the cross-sectional size of the first sub-connecting part remains unchanged, while the cross-sectional size of the second sub-connecting part continuously increases.

[0007] In some feasible implementations, the first sub-connecting part includes a first opening and a second opening, the first opening being connected to the receiving cavity and the second opening being connected to the second sub-connecting part; the second sub-connecting part includes a third opening, the third opening being connected to the external environment, and the first opening, the second opening and the third opening are arranged sequentially along the flow direction of the liquid water jet; wherein, the opening areas of the first opening and the second opening are the same, and the opening area of ​​the second opening is smaller than the opening area of ​​the third opening.

[0008] In some feasible implementations, the test cell includes a housing with a receiving cavity; a second connecting portion is formed in the bottom wall of the housing, and the height of the second connecting portion is the same as the thickness of the bottom wall.

[0009] In some feasible implementations, the ratio between the height of the first sub-connecting portion and the diameter of the first opening is less than or equal to 0.7.

[0010] In some feasible implementations, the second sub-connecting part is frustum-shaped, and the cone angle of the cone containing the frustum-shaped second sub-connecting part is 30°-90°.

[0011] In some feasible implementations, the second connecting part is within the projection range of the reflector along the flow direction of the liquid water jet, and the reflector is set horizontally.

[0012] In some feasible implementations, the first connecting part is formed on the top wall of the shell, and the first connecting part and the second connecting part are offset from the central axis of the cell to be detected.

[0013] In some feasible implementations, the material of the detection pool is an opaque material.

[0014] The liquid water jet refractive index detection system provided in the first aspect of this application can realize real-time detection of the refractive index of liquids in a flowing state. Compared with existing detection methods, it effectively shortens the sampling and settling time and improves the detection rate. At the same time, it solves the technical problem that existing detection methods cannot detect the refractive index of flowing liquids.

[0015] A second aspect of this application provides a method for detecting the refractive index of a liquid water jet, comprising: sending detection light into a test cell; reflecting the detection light into the liquid water jet using a reflector; the detection light undergoing total internal reflection within the liquid water jet; receiving the detection light within the liquid water jet using a detector and detecting the optical power in the detection light; and determining the refractive index of the liquid to be tested based on the optical power using a controller.

[0016] The liquid water jet refractive index detection method provided in the second aspect of this application is applied to the liquid water jet refractive index detection system of the first aspect. Its beneficial technical effects can be found in the first aspect, and will not be repeated here. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram illustrating the propagation of light between media of different densities. Figure 2 This is a schematic diagram of the structure of a liquid water jet refractive index detection system provided in an embodiment of this application; Figure 3 This is a cross-sectional view of a second connecting portion provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a first connecting part and a second connecting part provided in an embodiment of this application; Figure 5 This is a schematic flowchart of a liquid water jet refractive index detection method provided in an embodiment of this application.

[0019] Illustration markings: 100-Liquid water jet refractive index detection system; 10-Detection cell; 10a-Receiving cavity; 101-First connecting part; 102-Second connecting part; 1021-First sub-connecting part; 1022-Second sub-connecting part; a1-First opening; a2-Second opening; a3-Third opening; 20-Detection light source; 30-Reflector; 40-Detector; 50-Controller. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the protection scope of this application.

[0021] In the following description, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] Furthermore, in this application, directional terms such as "upper," "lower," "inner," and "outer" are defined relative to the indicated placement of the components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the placement of the components in the accompanying drawings.

[0023] When measuring the refractive index of liquids, laser detection is commonly used. The core principle is that when a laser beam refracts at a liquid surface, the angle of refraction changes with the liquid's refractive index. During the detection process, a laser emits a stable, well-directed beam of light into a container holding the liquid to be tested. The refractive index of the liquid is then determined based on the received refracted light. However, existing methods require sampling and settling the flowing liquid before testing can be performed, which significantly impacts the detection speed.

[0024] To address the aforementioned technical problems, this application provides a liquid water jet refractive index detection system, which can detect flowing liquids to determine the refractive index of the liquid to be detected in a shorter time, thereby improving the detection rate.

[0025] Figure 1 This is a schematic diagram illustrating the propagation of light between media of different densities.

[0026] See Figure 1 As shown, the angle of refraction differs when light is refracted through different media, and this angle is inversely related to the density of the medium. For example, if medium 1 is optically denser and medium 2 is optically less dense, then using the refractive index formula: n1 × sin1 = n2 × sin2, we can deduce that since n1 > n2, ∠1 < ∠2; where n1 is the density of medium 1 and n2 is the density of medium 2. ∠1 is the angle of incidence of light in medium 1, and ∠2 is the angle of refraction of light in medium 2.

[0027] When ∠2 is 90°, ∠1 is the critical angle, which means that only when the incident light is greater than the critical angle can all the light be reflected back to medium 1, that is, total internal reflection occurs.

[0028] Figure 2 This is a schematic diagram of the structure of a liquid water jet refractive index detection system provided in this application.

[0029] See Figure 2 As shown, the liquid water jet refractive index detection system 100 provided in this application embodiment includes a test cell 10, a detection light source 20, a reflector 30, a detector 40, and a controller 50.

[0030] The test chamber 10 includes a receiving cavity 10a for holding the liquid to be tested. The test chamber 10 includes a first connecting portion 101 and a second connecting portion 102. The receiving cavity 10a can be connected to the external environment through the first connecting portion 101, which is used to inject the liquid to be tested into the receiving cavity 10a. The receiving cavity 10a can also be connected to the external environment through the second connecting portion 102, which is used to discharge the liquid to be tested from the receiving cavity 10a to form a liquid water jet.

[0031] The cross-sectional area of ​​the second connecting portion 102 varies along the flow direction of the liquid water jet. In other words, the cross-sectional area of ​​the second connecting portion 102 varies along the direction of gravity.

[0032] Specifically, the first connecting part 101 can be the inlet of the test pool 10, and the second connecting part 102 can be the outlet of the test pool 10. When testing the liquid to be tested, the second connecting part 102 can be sealed first, and then opened after the test pool 10 contains a certain amount of liquid to achieve stable flow of the liquid. Alternatively, the injection speed of the liquid to be tested can be increased at the initial stage of injection to ensure the conductivity and stability of the liquid in the second connecting part 102. After ensuring stable outflow of the liquid from the second connecting part 102, the liquid to be tested can be tested to ensure detection accuracy.

[0033] It should be emphasized that the liquid water jet is used to characterize the state of the water jet flow of the liquid to be tested after passing through the second connecting part 102, and is not necessarily limited to the liquid to be tested containing water. The liquid to be tested can be a pure liquid or an aqueous solution. This application does not limit the specific composition of the liquid to be tested.

[0034] Figure 3 This is a cross-sectional view of a second connecting portion provided in an embodiment of this application.

[0035] In a specific implementation, see Figure 3 As shown, the second connecting portion 102 includes a first sub-connecting portion 1021 and a second sub-connecting portion 1022. In this implementation, the second connecting portion 102 can be a perforated structure formed in the test chamber 10. The height of the second connecting portion 102 is the same as the wall thickness of the test chamber 10. The first sub-connecting portion 1021 is located between the receiving cavity 10a and the second sub-connecting portion 1022, meaning that the liquid to be tested passes sequentially through the first sub-connecting portion 1021 and the second sub-connecting portion 1022 during the process of being conducted from the receiving cavity 10a to the external environment.

[0036] Furthermore, along the flow direction of the liquid water jet, the cross-sectional size of the first sub-connecting part 1021 remains unchanged, while the cross-sectional size of the second sub-connecting part 1022 continuously increases. That is, after the liquid to be detected passes through the first sub-connecting part 1021, the cross-sectional area of ​​the liquid water jet increases. Thus, compared to a typical outlet with a constant cross-sectional area, the second connecting part 102 can maintain a vortex-free liquid water jet, ensuring stability both inside and outside the flow field, effectively reducing droplet splashing and flow disturbance, and improving the stability and uniformity of liquid discharge. This, in turn, improves the signal-to-noise ratio and accuracy in the laser refractive index measurement process.

[0037] The detection light source 20 is configured to send detection light into the detection pool 10.

[0038] Specifically, the detection light is a laser. The refractive index of the liquid to be tested is detected by the laser. The laser does not make physical contact with the liquid to be tested. The detection is carried out through the total internal reflection phenomenon generated by the laser, which avoids contamination of the liquid and is suitable for liquids with different properties.

[0039] A reflector 30 is disposed within the receiving cavity 10a and is used to receive and reflect the detection light; wherein the detection light is reflected by the reflector 30 into the liquid water stream, and the detection light undergoes total internal reflection within the liquid water stream.

[0040] Specifically, when the detection light source 20 emits detection light into the receiving cavity 10a, the detection light is incident on the reflector 30 in the liquid to be detected, and the reflector 30 reflects the detection light into the liquid water stream in the second connecting part 102, and the detection light can undergo total internal reflection within the liquid water stream. The detection light source 20 can be a laser.

[0041] In some feasible implementations, the liquid water jet refractive index detection system may also include a collimator (not shown in the figure). The collimator is set in the optical path of the detection light source 20. The collimator is used to collimate the detection light to ensure the transmission efficiency of the detection light and facilitate subsequent detection.

[0042] See also Figure 2 As shown, in order to better understand the liquid water jet refractive index detection system 100 in this application, methanol solution is used as the standard solution for the following explanation.

[0043] Because the refractive index of methanol solution is lower than that of most liquids, its critical angle for total internal reflection in a liquid water stream is the largest. A collimated detection beam is incident into the methanol-water stream through a reflector 30° at an angle of incidence less than the critical angle for total internal reflection. Due to the large critical angle for total internal reflection of the methanol solution, part of the detection light is transmitted at the methanol-water stream-air interface, causing some laser light to escape. Another portion of the detection light undergoes multiple total internal reflections along the flow direction within the methanol-water stream. Subsequent detection of the totally reflected detection light allows for the deduction of the refractive index of methanol. This enables real-time detection of the refractive index of flowing methanol liquid.

[0044] When the liquid medium changes, that is, in the actual detection process, the refractive index of the liquid to be detected increases compared to the methanol solution, and its critical angle for total internal reflection decreases. When the incident detection light angle remains unchanged, it can accommodate more detection light beams to propagate in the liquid water stream.

[0045] The detector 40 is positioned below the test pool 10 and opposite the second connecting part 102; the detector 40 detects the optical power of the light in the liquid water stream.

[0046] See also Figure 2 As shown, the detector 40 is in contact with the liquid water beam in order to better receive the detection light within the liquid water beam.

[0047] Specifically, detector 40 can be a power detector to detect the optical power within the detection beam. The refractive index of the liquid under test can then be derived from the optical power. Thus, by setting detector 40, the detection speed can be effectively improved, real-time detection can be achieved, and strong anti-interference capabilities can be maintained.

[0048] It should be emphasized that the detector 40 is equipped with a waterproof layer (not shown in the figure), which faces the liquid water jet to protect the detector 40.

[0049] The controller 50 determines the refractive index of the liquid under flow conditions based on the optical power.

[0050] Specifically, the controller 50 can be connected to the detector 40, either via a wired or wireless connection. The controller 50 receives the optical power of the detection light sent by the detector 40 and calculates the refractive index of the liquid to be detected based on the optical power.

[0051] The liquid water jet refractive index detection system 100 provided in this application embodiment can realize real-time detection of the refractive index of a flowing liquid. Compared with existing detection methods, it effectively shortens the sampling and settling time and improves the detection rate. At the same time, it solves the technical problem that existing detection methods cannot detect the refractive index of flowing liquids.

[0052] In a specific implementation, see [link to relevant documentation]. Figure 3 As shown, the first sub-connecting portion 1021 includes a first opening a1 and a second opening a2. The first opening a1 communicates with the receiving cavity 10a, and the second opening a2 communicates with the second sub-connecting portion 1022. That is, the first opening a1 and the second opening a2 are arranged sequentially along the direction of the liquid water jet.

[0053] The second sub-connecting part 1022 includes a third opening a3, which communicates with the external environment. Along the flow direction of the liquid water jet, the first opening a1, the second opening a2, and the third opening a3 are arranged sequentially. The first opening a1 and the second opening a2 have the same opening area, while the opening area of ​​the second opening a2 is smaller than that of the third opening a3.

[0054] In other words, the second connecting portion 102 can be in the shape of an inverted funnel. In this implementation, a first opening a1, a second opening a2, and a third opening a3 can be sequentially formed on the wall of the test pool 10 to form the second connecting portion 102. In this way, the second connecting portion 102 is set in the form of openings with different opening areas, which is simple in process and easy to form.

[0055] It should be emphasized that the first opening a1, the second opening a2, and the third opening a3 can be circular, square, elliptical, or other shapes.

[0056] In some feasible implementations, the second connecting portion 102 can also be configured as a connector, and the test pool 10 includes a housing with a receiving cavity 10a. In this implementation, a mounting groove can be formed in the housing of the test pool 10, and the second connecting portion 102 can be disposed in the mounting groove. The structural forms of the first sub-connecting portion 1021 and the second sub-connecting portion 1022 of the second connecting portion 102 can be the same as those in the aforementioned implementations. In this implementation, the second connecting part 102 is easy to install. It only requires opening an installation groove in the shell of the test pool 10. The cross-sectional dimensions of the installation groove can be the same as the cross-sectional dimensions of the first sub-connecting part 1021. The first sub-connecting part 1021 can be set inside the shell of the test pool 10, and the second sub-connecting part 1022 can be set outside the shell of the test pool 10; or the cross-sectional dimensions of the installation groove can be the same as the cross-sectional dimensions of the second sub-connecting part 1022, and both the first sub-connecting part 1021 and the second sub-connecting part 1022 can be set in the shell of the test pool 10, and the installation groove is sealed to the outer wall surface of the first sub-connecting part 1021.

[0057] In this way, the second connecting part 102 can be flexibly configured to improve its adaptability.

[0058] In some feasible implementations, the second connecting portion 102 is formed on the bottom wall of the housing, so that the liquid water jet flows in a straight line, thereby facilitating total internal reflection of the detection light inside. In this implementation, the height of the second connecting portion 102 is the same as the thickness of the bottom wall. That is, taking the second connecting portion 102 as an opening in the bottom wall as an example, in this implementation, the first opening a1 and the third opening a3 are respectively formed on the upper and lower wall surfaces of the bottom wall, and the second opening a2 is located inside the bottom wall. Alternatively, if the second connecting portion 102 is set in the bottom wall as a connector, in this implementation, the first opening a1 and the third opening a3 can be flush with the upper and lower wall surfaces of the bottom wall, respectively, and the second opening a2 is located inside the bottom wall.

[0059] In some feasible implementations, taking the example of the second connecting portion 102 being formed in the form of an opening in the bottom wall, the specific structural dimensions of the second connecting portion 102 will be described in detail. See also... Figure 3 As shown, W is the length of the bottom wall, H is the thickness of the bottom wall, L is the height of the first sub-connecting part 1021, the height of the second sub-connecting part 1022 is HL, and d is the diameter of the first opening a1.

[0060] In this implementation, the ratio between the height L of the first sub-connecting portion 1021 and the diameter d of the first opening a1 is less than or equal to 0.7. For example, L / d can be 0.7 or L / d can be 0.6. It can be understood that the height L of the first sub-connecting portion 1021 is less than the diameter d of the first opening a1. Thus, while ensuring effective conduction of the liquid to be detected, setting a relatively short first sub-connecting portion 1021 along the flow direction of the liquid water jet effectively avoids eddies generated by flow separation of the liquid to be detected in the first sub-connecting portion 1021, thereby reducing the possibility of flow separation, helping to maintain a stable flow state of the liquid water jet, and thus ensuring detection accuracy.

[0061] It should be emphasized that in the above implementation, the first opening a1 is circular. In other implementations, such as when the first opening a1 is square or other shaped, d is the length of the first opening a1 along the bottom wall. It can be understood that the size of the second connecting part 102 is relatively small. The liquid water jet can be understood as a narrowed beam. The detection light is coupled with the narrowed beam to achieve real-time detection of the refractive index of the liquid to be detected.

[0062] In some feasible implementations, the second sub-connecting portion 1022 is frustum-shaped, and the cone angle θ of the cone containing the frustum-shaped second sub-connecting portion 1022 is 30°-90°. Specifically, the size of the angle θ affects the flow velocity and pressure of the liquid water jet. Setting the angle θ within the range of 30°-90° can effectively prevent the formation of vortex regions in the liquid to be detected within the second sub-connecting portion 1022, thereby ensuring the stable flow of the liquid water jet.

[0063] It is understandable that during the flow of the liquid to be tested from the receiving cavity 10a to the external environment, the first sub-connecting part 1021 can be regarded as a contraction section, and the second sub-connecting part 1022 can be regarded as an expansion section. The contraction section and the expansion section cooperate with each other to achieve stable flow of the liquid water jet.

[0064] For example, the angle θ can be 60° or 90°. Of course, the angle θ can also be any other angle between 30° and 90°.

[0065] In some feasible implementations, in order to ensure that the detection light can be better incident into the liquid water stream through the reflector 30 and subsequently undergo total internal reflection in the liquid water stream, the positional relationship between the reflector 30 and the second connecting part 102 is adjusted to achieve the integrity of the total internal reflection optical path.

[0066] Specifically, along the flow direction of the liquid water jet, the second connecting portion 102 is within the projection range of the reflector 30, and the reflector 30 is horizontally positioned. That is, along the direction of gravity, the projection of the second connecting portion 102 onto the bottom wall of the housing covers the second connecting portion 102. In this way, by adjusting the position of the detection light source 20, the detection light can be controlled to achieve total internal reflection within the liquid water jet.

[0067] See also Figure 2 As shown, α represents the angle between the incident light of the detection light and the reflector 30, and β represents the angle between the reflected light of the detection light after passing through the reflector 30 and the reflected light on the surface of the liquid water jet. The reflector 30 is placed horizontally, and the refractive index of the liquid is n. 液The refractive index n0 of the external air in the liquid water jet determines the angular relationship between β and α to be β = 2α according to the law of reflection. For common solutions with a refractive index of 1.32-1.8, the α angle can be set to 33.7°. According to the law of refraction, the detection light beam does not satisfy the condition of total internal reflection, resulting in a low coupling ratio between the detection light and the liquid water jet. Therefore, most of the detection light energy is refracted through the liquid water jet, and the light power obtained by the liquid water jet illuminating the detector 40 below is low. As the refractive index of the liquid changes from low to high, the critical angle for total internal reflection at the interface between the liquid water jet and the air decreases, the angle of refraction of the detection light into the air decreases, the coupling ratio between the detection light and the liquid water jet increases, and more detection light energy is transmitted through the liquid water jet to the detector 40, increasing the power obtained by the liquid water jet illuminating the detector 40. Therefore, by establishing the relationship between the refractive index and the power reading of the detector 40, the real-time refractive index change of the liquid can be obtained. The power reading is positively correlated with the refractive index of the liquid being detected. In other words, the greater the optical power of the detection light, the greater the refractive index of the liquid being tested.

[0068] It should be emphasized that, please continue to refer to Figure 2 As shown, to better demonstrate the total internal reflection of the detection light in the liquid water beam, the size of the liquid water beam is displayed as relatively large for ease of observation, and is not a proportional representation of its actual size. Similarly, in this implementation, the detection light source 20 is inserted into the housing of the test cell 10. However, to better demonstrate the propagation direction of the detection light, in actual testing, the detection light source 20 can be placed outside the test cell 10, thus eliminating the need for a mounting portion on the wall of the test cell for installing the detection light source 20. Due to the strong penetrating power of laser light, the detection light source 20 can be directly placed outside the test cell 10.

[0069] In some feasible implementations, the material of the detection cell 10 is opaque. This prevents light from the external environment from entering the receiving cavity 10a and affecting the detection light. For example, the material of the detection cell 10 can be iron or steel.

[0070] Specifically, the test cell 10 is a sealed structure with a top wall and a bottom wall. That is to say, the receiving cavity 10a can only communicate with the external environment through the first connecting part 101 and the second connecting part 102, and the rest of the part is a sealed structure and is opaque.

[0071] Figure 4 This is a schematic diagram of the structure of a first connecting part and a second connecting part provided in an embodiment of this application.

[0072] Among some feasible implementation methods, see Figure 4As shown, the first connecting part 101 is opened on the top wall of the housing, and the first connecting part 101 and the second connecting part 102 are offset along the central axis of the test cell 10.

[0073] For example, the first connecting portion 101 can be located on the left side of the top wall, and the second connecting portion 102 can be located on the right side of the bottom wall. In this way, the liquid to be tested will not interfere with the liquid water jet during the injection process into the receiving cavity 10a, and the flow stability of the liquid water jet can be effectively guaranteed.

[0074] Corresponding to the above-described liquid water jet refractive index detection system 100, this application also provides an embodiment of a liquid water jet refractive index detection method.

[0075] Figure 5 This is a schematic flowchart of a liquid water jet refractive index detection method provided in an embodiment of this application.

[0076] Combination Figure 2 and Figure 5 As shown, the liquid water jet refractive index detection method provided in this application embodiment can be implemented by the following steps S1 to S4.

[0077] Step S1: Send detection light into the detection pool 10.

[0078] Specifically, before executing step S1, the liquid water jet refractive index detection system 100 has been set up, and a liquid water jet with a stable flow rate has been formed outside the test pool 10. At this time, the first connecting part 101 can adjust its working state based on the volume of the receiving cavity 10a. For example, when the volume of the receiving cavity 10a is small, in order to ensure the flow stability of the liquid water jet, it is necessary to continuously inject the liquid to be tested into the receiving cavity 10a through the first connecting part 101; or when the volume of the receiving cavity 10a is large enough, the receiving cavity 10a can be filled at once, and then the second connecting part 102 can be opened to form a liquid water jet; or when the volume of the receiving cavity 10a is large enough, after injecting part of the liquid to be tested into the receiving cavity 10a, the injection and output of the liquid to be tested can be maintained simultaneously.

[0079] Step S2: The reflector 30 reflects the detection light into the liquid water stream; the detection light undergoes total internal reflection within the liquid water stream.

[0080] Step S3: Detector 40 receives the detection light in the liquid water beam and detects the optical power in the detection light.

[0081] Step S4: The controller 50 determines the refractive index of the liquid to be detected based on the optical power.

[0082] The liquid water jet refractive index detection method provided in this application, using the aforementioned liquid water jet refractive index detection system 100, can realize real-time detection of the refractive index of the liquid under flow conditions. Compared with existing detection methods, it effectively shortens the sampling and settling time and improves the detection rate. It also solves the technical problem that existing detection methods cannot detect the refractive index of flowing liquids.

[0083] It should be noted that, upon considering the specification and practicing the application disclosed herein, those skilled in the art will readily conceive of other embodiments of this application. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0084] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The true scope is indicated by this application.

Claims

1. A liquid water beam refractive index detection system, characterized by, The system comprises: a detection pool, which comprises a containing cavity, wherein a liquid to be detected is contained, and which comprises a first communication part and a second communication part, wherein the containing cavity is in communication with an external environment through the first communication part and the second communication part, the first communication part is configured to inject the liquid to be detected into the containing cavity, and the second communication part is configured to guide the liquid to be detected in the containing cavity to form a liquid jet flow, wherein the cross-sectional area of the second communication part is different along the flow direction of the liquid jet flow; a detection light source, which is configured to send detection light into the detection pool; a mirror, which is arranged in the containing cavity and is configured to receive the detection light and reflect the detection light into the liquid jet flow, wherein the detection light forms total reflection in the liquid jet flow; a detector, which is arranged below the detection pool and opposite to the second communication part, and is configured to detect the optical power of the detection light in the liquid jet flow; a controller, which is configured to determine the refractive index of the liquid to be detected in a flow state based on the optical power.

2. The system according to claim 1, wherein the second communication part comprises a first sub-communication part and a second sub-communication part, and the first sub-communication part is located between the containing cavity and the second sub-communication part; along the flow direction of the liquid jet flow, the cross-sectional size of the first sub-communication part is constant, and the cross-sectional size of the second sub-communication part is continuously increasing.

3. The system according to claim 2, wherein the first sub-communication part comprises a first opening and a second opening, the first opening is in communication with the containing cavity, and the second opening is in communication with the second sub-communication part; the second sub-communication part comprises a third opening, the third opening is in communication with the external environment, and along the flow direction of the liquid jet flow, the first opening, the second opening and the third opening are arranged in sequence; wherein the opening area of the first opening and the second opening is the same, and the opening area of the second opening is smaller than the opening area of the third opening.

4. The system according to claim 1, wherein the detection pool comprises a shell, and the shell is provided with the containing cavity; the second communication part is opened in the bottom wall of the shell, and the height of the second communication part is the same as the thickness of the bottom wall.

5. The system according to claim 3, wherein the ratio between the height of the first sub-communication part and the diameter of the first opening is less than or equal to 0.

7.

6. The system according to claim 2, wherein the second sub-communication part is in the shape of a circular truncated cone, and the angle of the cone angle of the circular truncated cone is 30°-90°.

7. The system according to claim 1, wherein along the flow direction of the liquid jet flow, the second communication part is within the projection range of the mirror, and the mirror is arranged horizontally. 8.The liquid jet refractive index detection system of claim 4, wherein the first communication portion is formed in a top wall of the housing, and the first communication portion and the second communication portion are arranged in a staggered manner with respect to a central axis of the detection cell. 9.The liquid jet refractive index detection system of any one of claims 1-8, wherein the detection cell is made of an opaque material. The liquid jet refractive index detection method is applied to the liquid jet refractive index detection system of any one of claims 1-9, and the liquid jet refractive index detection method comprises: sending a detection light into the detection cell; 10. A method of liquid jet beam refractive index detection, characterized by, reflecting the detection light to the liquid jet stream by a reflector, and forming total reflection of the detection light in the liquid jet stream; receiving the detection light in the liquid jet stream by a detector, and detecting optical power in the detection light; determining a refractive index of the liquid to be detected based on the optical power. ​ ​

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