A spectral detection device

Abstract

The utility model discloses a kind of spectral detection equipment.The spectral detection equipment includes the sample detection pipeline for fluid sample to flow through, and the detector device of emitting and receiving light rays.The sample detection pipeline includes the sample inlet for fluid sample to flow in, the sample outlet for fluid sample to flow out, and the sample cell between the sample inlet and the sample outlet.At least part wall surface of the sample cell is light-transmitting surface, so that light rays can be transmitted through the fluid in the sample cell and the light-transmitting surface emit, the detector device is set on the transmission path of the light rays, to receive the light rays that are transmitted through the fluid in the sample cell and the light-transmitting surface carry out spectral detection.The spectral detection equipment provided by the utility model can be directly deployed in production line, without sampling to be measured liquid product, to realize online real-time detection, and has the characteristics of portable and miniaturization.

Description

Technical Field

[0001] This utility model relates to the field of spectral measurement technology, specifically to a spectral detection device. Background Technology

[0002] In the field of production process monitoring in the chemical and food industries, online liquid spectroscopy is a widely used technology for monitoring the quality and composition of liquid products. This technology relies on the absorption characteristics of substances to specific wavelengths of light to analyze key indicators such as the content and purity of target components in liquid products. It provides data support for the stability control of the production process and the assurance of product quality, making it an indispensable monitoring component in modern chemical and food production systems.

[0003] However, existing online liquid spectral detection technologies also have shortcomings. Firstly, the sampling and analysis methods employed in current technologies result in monitoring delays. In existing technologies, liquid spectral detection requires sampling from the production line and transferring the sample to the analytical equipment, which not only increases operational steps but also causes the detection results to fail to reflect the immediate state of the liquid due to the time difference, making it difficult to quickly respond to production anomalies. Secondly, existing technologies typically use large spectrometers, leading to poor adaptability. The core equipment for liquid spectral detection in existing technologies is mostly large spectrometers, which, while highly accurate, are expensive, with high R&D, production, and maintenance costs. Furthermore, their bulky size makes miniaturization and integration difficult, hindering deployment near production lines and failing to meet the needs of online real-time monitoring, thus limiting their application in continuous production scenarios such as chemical and food industries.

[0004] Therefore, it is necessary to propose a new technical solution to overcome the shortcomings of existing technologies. Utility Model Content

[0005] This invention aims to address one of the technical problems in related technologies to a certain extent. To this end, this invention provides a spectral detection device that can be directly deployed on a production line without the need for sampling the liquid product to be tested, enabling online real-time detection, and is portable and miniaturized.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a spectral detection device, comprising a sample detection pipeline through which a fluid sample flows, and a detector device for emitting and receiving light. The sample detection pipeline includes a sample inlet for the fluid sample to flow in, a sample outlet for the fluid sample to flow out, and a sample cell located between the sample inlet and the sample outlet. At least a portion of the wall surface of the sample cell is a light-transmitting surface, so that light can pass through the fluid in the sample cell and the light-transmitting surface to be emitted. The detector device is disposed on the light transmission path to receive the light transmitted through the fluid in the sample cell and the light-transmitting surface for spectral detection.

[0007] As a further improved technical solution, the sample detection pipeline is arranged at an angle within the spectral detection device so that the fluid flows at an angle, wherein the central axis of the sample detection pipeline forms an angle of 30° to 60° with the vertical plane.

[0008] As a further improved technical solution, the central axis of the sample detection pipeline forms a 45° angle with the vertical plane.

[0009] As a further improved technical solution, the sample cell includes at least a pair of parallel light-transmitting surfaces, which have a deflection angle of 8° to 15° relative to the vertical plane perpendicular to the incident light.

[0010] As a further improved technical solution, the detector device includes a light source module and a detection module respectively disposed on opposite sides of a pair of light-transmitting surfaces.

[0011] As a further improved technical solution, the light source module includes multiple independently driven light sources, which are configured such that only a single light source is lit at any given time.

[0012] As a further improved technical solution, the light source includes one or more of light-emitting diodes, superluminescent diodes, and lasers, and when the light source is a light-emitting diode or a superluminescent diode, the light source module also includes a narrowband filter corresponding to the light source.

[0013] As a further improved technical solution, the light source module includes a temperature sensor for detecting the internal temperature of the light source module, and a semiconductor cooler for regulating the internal temperature of the light source module.

[0014] As a further improved technical solution, the detection module includes multiple photodetectors and a light-shielding cover for accommodating the multiple photodetectors. The light-shielding cover separates the multiple photodetectors into independent receiving slots, and the multiple photodetectors are arranged in a one-to-one correspondence with the multiple light sources.

[0015] As a further improved technical solution, the spectral detection device includes a housing, the sample detection pipeline and the detector device are disposed in the housing, and the sample inlet and sample outlet of the sample detection pipeline are exposed outside the housing, wherein the sample inlet is at the top and the sample outlet is at the bottom, so that the fluid flows obliquely from top to bottom.

[0016] The spectral detection device provided by this utility model includes a sample detection pipeline and a detector device. During operation, the fluid sample flows from the sample inlet of the sample detection pipeline through the sample cell and then flows out from the sample outlet. When the liquid sample flows through the sample cell, light penetrates the fluid and the light-transmitting surface in the sample cell and is received by the detector device. After converting and analyzing the transmitted light, the spectral absorption characteristics data of the sample can be obtained, and then the content or purity of the target component can be analyzed. This spectral detection device is characterized by miniaturization and portability, realizing the direct embedding of the spectral detection device into the production line, performing in-situ, real-time spectral analysis of fluid samples, and significantly improving the timeliness and accuracy of production process monitoring.

[0017] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a perspective view of the sample detection pipeline in one embodiment of the spectral detection device of this utility model.

[0019] Figure 2 This is a schematic diagram of a module of an embodiment of the spectral detection device of this utility model.

[0020] Figure 3 This is a schematic diagram of the light source module in one embodiment of the spectral detection device of this utility model.

[0021] Figure 4 This is a schematic diagram showing the coordination of the light source module, sample detection pipeline, and detection module in one embodiment of the spectral detection equipment of this utility model.

[0022] Figure 5 This is a schematic diagram of the detection module in one embodiment of the spectral detection device of this utility model.

[0023] Figure 6 This is a schematic diagram of the combined structure of an embodiment of the spectral detection device of this utility model.

[0024] Among them, 10 is the sample detection pipeline; 11 is the sample inlet; 12 is the sample outlet; 13 is the sample cell; 131 is the light-transmitting surface; 20 is the light source module; 21 is the light source; 22 is the heat insulation shell; 23 is the narrow band filter; 24 is the temperature sensor; 25 is the semiconductor cooler; 30 is the detection module; 31 is the photodetector; 32 is the light-shielding cover; 320 is the receiving slot; 40 is the circuit module; and 50 is the outer shell. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0026] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this patent. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0027] This invention provides a spectral detection device designed to address the monitoring lag caused by sampling and analysis in existing technologies, as well as the poor compatibility and difficulty in integrating large spectrometers. The spectral detection device provided by this invention features a miniaturized and portable design, enabling direct embedding into production lines for in-situ, real-time spectral analysis of fluid samples, thereby significantly improving the timeliness and accuracy of production process monitoring. The technical solution of this invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please see Figures 1 to 6 As shown, the spectral detection device provided by this utility model includes a sample detection pipeline 10 through which a fluid sample flows, and a detector device for emitting and receiving light. The sample detection pipeline 10 includes a sample inlet 11 for the inflow of the fluid sample, a sample outlet 12 for the outflow of the fluid sample, and a sample cell 13 located between the sample inlet 11 and the sample outlet 12. At least a portion of the wall surface of the sample cell 13 is a light-transmitting surface 131, allowing light to pass through the fluid within the sample cell 13 and the light-transmitting surface 131 before exiting. The detector device is disposed in the light transmission path to receive the light transmitted through the fluid within the sample cell 13 and the light-transmitting surface 131 for spectral detection.

[0029] The spectral detection device provided by this utility model includes a sample detection pipeline 10 and a detector device. During operation, a fluid sample flows from the sample inlet 11 of the sample detection pipeline 10 through the sample cell 13 and then out through the sample outlet 12. As the liquid sample flows through the sample cell 13, light penetrates the fluid within the sample cell 13 and the light-transmitting surface 131, and is received by the detector device. After converting and analyzing the transmitted light, the spectral absorption characteristics of the sample can be obtained, thereby analyzing the content or purity of the target component. This spectral detection device is characterized by its miniaturization and portability, enabling direct embedding of the spectral detection device into the production line for in-situ, real-time spectral analysis of fluid samples, significantly improving the timeliness and accuracy of production process monitoring.

[0030] Please see Figure 1 As shown, the sample detection pipeline 10 serves as a flow channel for the fluid sample. In this embodiment, it includes a sample inlet 11, a sample outlet 12, and a sample pool 13 connecting the two. In this embodiment, the sample detection pipeline 10 is arranged at an angle within the spectroscopic detection device to allow the fluid to flow at an angle, wherein the fluid is a liquid. In some embodiments, the fluid may be in other states, such as water mist or other gas-liquid mixtures. In this embodiment, the sample detection pipeline 10 is arranged within the spectroscopic detection device, and in use, the central axis of the sample detection pipeline 10 forms an angle α with the vertical plane. The preferred range of this angle α is set between 30° and 60°. More preferably, the angle α is selected as 45°. This inclined arrangement allows the fluid to flow at an angle within the pipeline. When the sample inlet 11 is located above and the sample outlet 12 is located below, the liquid can achieve an inclined flow from top to bottom under the action of gravity. This flow pattern has multiple positive effects: First, it can use the liquid's own gravity and flow inertia to guide air bubbles in the liquid to float naturally upwards and be discharged along the inclined direction of the pipe, effectively removing air bubbles from the liquid entering the sample cell 13, reducing the interference of air bubbles on spectral detection, and improving the accuracy of detection data; Second, the inclined flow channel helps to form a more stable and smooth laminar flow, reducing signal fluctuations that may be caused by turbulence, providing a stable optical environment for the detector device, thereby improving the repeatability and accuracy of detection data.

[0031] Please continue reading. Figure 1As shown, in this embodiment, both the sample inlet 11 and the sample outlet 12 are cylindrical pipe sections, and their diameter and interface specifications are designed according to the flow rate, volume, and pipeline specifications of the liquid during the production process. The sample cell 13 is a flat polygonal pipe section to facilitate light transmission and improve detection accuracy. In this embodiment, the sample cell 13 has a hexagonal pipeline structure, which includes at least a pair of parallel light-transmitting surfaces 131, which constitute an optical window for light to pass through the fluid sample. The detector device includes a light source module 20 and a detection module 30, which are respectively located on opposite sides of the pair of light-transmitting surfaces 131. In practical applications, the material of the sample detection pipeline 10 can be selected according to the detection spectral band and the chemical properties of the liquid, specifically including inorganic optical materials such as quartz, silicon, germanium, and glass, and organic optical materials such as PMMA and PTFE.

[0032] To further optimize optical performance and reduce light energy loss caused by strong reflection when light is incident perpendicularly on the interface, as well as the resulting stray light interference, the orientation of the light-transmitting surface 131 in this embodiment of the invention is specially designed. For example... Figure 1 and Figure 2 As shown, in this embodiment, the pair of light-transmitting surfaces 131 are not parallel to the perpendicular direction of the incident light, but rather have a specific deflection angle β compared to the perpendicular surface perpendicular to the incident light. In this embodiment, the deflection angle β ranges from 8° to 15°. By introducing this deflection angle, the incident light can be directed towards the light-transmitting surface 131 at a certain tilt angle rather than a perpendicular angle. According to optical principles, non-perpendicular incidence can effectively change the direction of the reflected light, causing it to deviate from the original light path, thereby reducing or avoiding light reflection and significantly reducing the interference of interface reflection on the effective signal. Although this design detail is structurally simple, it has a significant effect on improving the signal-to-noise ratio of the system and ensuring the effective detection of weak absorbed signals.

[0033] Please see Figure 2 and Figure 4 As shown, the detector device includes a light source module 20 and a detection module 30 disposed on opposite sides of a pair of light-transmitting surfaces 131, and a circuit module 40 electrically connected to the light source module 20 and the detection module 30. The light source module 20 is mainly used to generate the light required for detection. The emitted light passes sequentially through the first light-transmitting surface 131, the fluid sample flowing through the sample cell 13, and the second light-transmitting surface 131, and is finally received by the detection module 30. The detection module 30 is mainly used to convert the optical signal carrying fluid absorption information into an electrical signal and connect it to other circuit devices to achieve spectral analysis. The circuit module 40 is used to provide the electrical energy and signals required for the normal operation of the light source module 20 and the detection module 30.

[0034] Specifically, please refer to Figure 3 As shown, in this embodiment, the light source module 20 includes multiple independently driven light sources 21, which are configured such that only one light source 21 is lit at a time. The light source module 20 in this embodiment includes multiple independently driven light sources 21, which are configured so that only one light source is lit at a time, i.e., a "light-up-by-light" driving method is adopted to avoid stray light interference. This design allows multiple light sources 21, such as LEDs emitting different center wavelengths, to share the same optical path and detection system, realizing the integrated function of multi-wavelength spectral detection without requiring separate optical paths and detectors for each wavelength, greatly simplifying the system structure and reducing cost and size. The type of light source 21 can be selected according to detection requirements, including but not limited to light-emitting diodes (LEDs), superluminescent diodes (SLEDs), or lasers (LDs). When a light source 21 with a relatively wide spectral bandwidth is selected, such as when the light source 21 is a light-emitting diode or a superluminescent diode, in order to obtain emitted light with better narrowband characteristics and higher monochromaticity to improve spectral resolution, the light source module 20 further includes a narrowband filter 23 corresponding to the light source 21. This narrowband filter 23 is configured one-to-one with multiple light sources 21, effectively filtering out non-central wavelength components in the emission spectrum of the light source, so that the light emitted by the light source 21, after passing through the narrowband filter, outputs narrowband spectral output light that matches the spectral characteristic position of the measured object.

[0035] Please continue reading. Figure 3 As shown, in this embodiment, the light source module 20 includes a temperature sensor 24 for detecting the internal temperature of the light source module 20, and a semiconductor cooler 25 for regulating the internal temperature of the light source module 20. Considering that the light output characteristics (such as wavelength and intensity) of the light source 21 will drift with its own temperature changes, thereby affecting the long-term stability and accuracy of the detection results, this embodiment of the present invention integrates a temperature control mechanism in the light source module 20. Specifically, a temperature sensor 24 is provided inside the light source module 20 to monitor the temperature of the light source 21 and its surrounding environment in real time. At the same time, a semiconductor cooler 25 is also provided, which can actively regulate the internal temperature of the light source module 20 by raising and lowering it according to the feedback signal of the temperature sensor 24, so as to maintain it within a set constant temperature range. This precise temperature control effectively suppresses the measurement error introduced by the temperature drift of the light source, and provides a guarantee for long-term, stable, and high-precision detection.

[0036] In this embodiment, the temperature sensor 24 is an NTC (Negative Temperature Coefficient) sensor; in other embodiments, it can be other types of sensors. In this embodiment, a thermoelectric cooler 25 (TEC) is used for temperature control. The thermoelectric cooler 25 is based on the Peltier effect for cooling or heating, and features high temperature control accuracy, bidirectional temperature control, and a compact, easily integrated structure. Of course, other temperature control elements can be used in other embodiments. Furthermore, in this embodiment, the light source module 20 also includes an insulating housing 22, within which the multiple light sources 21 are encapsulated. This arrangement helps reduce the direct impact of external ambient temperature fluctuations on the internal light sources 21, improving temperature control efficiency and stability.

[0037] Please see Figure 4 and Figure 5 As shown, the detection module 30 is mainly used to convert the optical signal carrying fluid absorption information into an electrical signal. The detection module 30 includes multiple photodetectors 31 and a light-shielding housing 32 for housing the multiple photodetectors 31. The light-shielding housing 32 separates the multiple photodetectors 31 into independent receiving slots 320. The multiple photodetectors 31 are arranged in a one-to-one correspondence with the multiple light sources 21. Specifically, the multiple photodetectors 31 are arranged in a one-to-one correspondence with the multiple light sources 21 in the light source module 20, so that when a light source 21 of a specific wavelength is lit, its emitted light passes through the sample and is received by a dedicated photodetector 31. This one-to-one correspondence simplifies signal routing and processing logic. The light-shielding housing 32 prevents crosstalk between different optical paths, meaning that light emitted by one light source 21 will not be received by a non-corresponding photodetector 31. In this embodiment, the light-shielding housing 32 includes multiple independent receiving slots 320, and each photodetector 31 is placed in an independent receiving slot 320. This physical isolation structure ensures the optical independence of each detection channel, effectively avoids cross-contamination of optical signals, and guarantees the purity and reliability of multi-wavelength detection data.

[0038] Please refer to it again. Figure 2As shown, the circuit module 40 is the control and data processing center of the device. The circuit module 40 includes a light source driving circuit, a sampling circuit, a temperature control circuit, and a control calculation unit. The light source driving circuit provides constant drive for each light source 21; the temperature control circuit is used to collect the real-time temperature of the light source 21 through an NTC thermistor, and adjust the working state of the semiconductor cooler 25 according to the collected temperature data, ultimately achieving stable control of the ambient temperature of the light source 21; the sampling circuit samples each output light passing through the sample through a photodetector 31 to obtain the corresponding power value; the control calculation unit is used to send control signals and perform calculation and analysis on the collected data.

[0039] In one embodiment, the circuit module 40 functions as follows: controlling the time-sharing illumination of each light source 21 according to a preset timing sequence; providing driving power to the semiconductor cooler 25 and processing the feedback signal from the temperature sensor 24 to achieve precise temperature control; receiving electrical signals from each photodetector 31 and performing preprocessing such as amplification and filtering; and finally, calculating the absorbance of the fluid through a built-in algorithm and further analyzing and obtaining information such as the concentration of the component to be measured.

[0040] Please see Figure 6 As shown, in a specific embodiment of the spectral detection device provided by this utility model, the spectral detection device includes a housing 50, the sample detection pipeline 10 and the detector device are disposed in the housing 50, the sample inlet 11 and the sample outlet 12 of the sample detection pipeline 10 are exposed outside the housing 50 to connect to the liquid in the production outflow line, the sample inlet 11 is on top and the sample outlet 12 is on the bottom, so that the fluid flows obliquely from top to bottom.

[0041] The process of performing spectral detection using an embodiment of the spectral detection equipment of this utility model is described below.

[0042] Before the device leaves the factory, the sample cell 13 is subjected to an unloaded optical power measurement under the standard state of constant driving current and constant temperature control of the light source 21. That is, the measurement is performed under the state of no fluid flow. The optical power data of each path received by each photodetector 31 at this time are recorded as IS1, IS2, IS3, ..., ISN; where N is the total number of corresponding channels of the light source 21 and photodetector 31, and ISN represents the unloaded optical power value of the Nth channel.

[0043] In the actual testing phase, after the liquid to be tested flows through the sample cell 13, the photodetector 31 samples the power of each output light that penetrates the sample and obtains the measured optical power data of the corresponding channel, which are denoted as ID1, ID2, ID3, ..., IDN; where IDN represents the power value of the light after penetrating the liquid to be tested in the Nth channel.

[0044] The spectral response of the test liquid is defined as the ratio of the power value of light after passing through the test liquid to the empty light power value of the sample cell. The corresponding calculation formula is:

[0045] Through the above calculations, the spectral response data of the liquid under test corresponding to each spectral characteristic wavelength λ1, λ2, λ3, ..., λN can be obtained, and finally a complete spectral response sequence P1, P2, P3, ..., PN can be formed; where λN represents the spectral characteristic wavelength corresponding to the Nth channel, and PN is the spectral response value of the liquid under test at that wavelength.

[0046] In summary, as described above regarding the specific embodiments, this invention, by designing the sample detection pipeline 10 with a specific angled tilt, introducing a deflection angle to the light-transmitting surface 131 of the sample cell 13 to suppress reflection interference, employing a multi-source light-distribution and corresponding detection structure supplemented by precise temperature control and light-shielding design, and highly integrating all components into a single housing 50, collectively constitutes a compact, accurate, stable, and easily deployable online spectroscopic detection device. It successfully overcomes the limitations of traditional offline sampling analysis and large spectrometers, providing an efficient and economical solution for real-time, online monitoring of liquid quality in chemical, food, and other industrial processes.

[0047] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A spectral detection device, characterized in that, The sample detection pipeline (10) includes a sample inlet (11) through which a fluid sample flows, and a detector device for emitting and receiving light. The sample detection pipeline (10) includes a sample inlet (11) for the fluid sample to flow in, a sample outlet (12) for the fluid sample to flow out, and a sample pool (13) located between the sample inlet (11) and the sample outlet (12). At least a portion of the wall of the sample pool (13) is a light-transmitting surface (131) so that light can pass through the fluid in the sample pool (13) and the light-transmitting surface (131) and be emitted. The detector device is disposed on the light transmission path to receive the light passing through the fluid in the sample pool (13) and the light-transmitting surface (131) for spectral detection.

2. The spectral detection device according to claim 1, characterized in that, The sample detection pipeline (10) is arranged at an angle within the spectral detection device so that the fluid flows at an angle, wherein the central axis of the sample detection pipeline (10) forms an angle of 30° to 60° with the vertical plane.

3. The spectral detection device according to claim 2, characterized in that, The central axis of the sample detection pipeline (10) forms a 45° angle with the vertical plane.

4. The spectral detection device according to claim 1, characterized in that, The sample cell (13) includes at least one pair of parallel light-transmitting surfaces (131), which have a deflection angle of 8° to 15° relative to a vertical plane perpendicular to the incident light.

5. The spectral detection device according to any one of claims 1 to 4, characterized in that, The detector device includes a light source module (20) and a detection module (30) disposed on opposite sides of a pair of light-transmitting surfaces (131).

6. The spectral detection device according to claim 5, characterized in that, The light source module (20) includes multiple independently driven light sources (21), which are configured such that only a single light source (21) is lit at any given time.

7. The spectral detection device according to claim 6, characterized in that, The light source (21) includes one or more of light-emitting diodes, superluminescent diodes and lasers, and when the light source (21) is a light-emitting diode or a superluminescent diode, the light source module (20) also includes a narrowband filter (23) corresponding to the light source (21).

8. The spectral detection device according to claim 6, characterized in that, The light source module (20) includes a temperature sensor (24) for detecting the internal temperature of the light source module (20) and a semiconductor cooler (25) for regulating the internal temperature of the light source module (20).

9. The spectral detection device according to claim 6, characterized in that, The detection module (30) includes multiple photodetectors (31) and a light-shielding cover (32) for accommodating the multiple photodetectors (31). The light-shielding cover (32) separates the multiple photodetectors (31) into independent receiving slots (320). The multiple photodetectors (31) are arranged one-to-one with the multiple light sources (21).

10. The spectral detection device according to any one of claims 1 to 4, characterized in that, The spectral detection device includes a housing (50), the sample detection pipeline (10) and the detector device are disposed in the housing (50), and the sample inlet (11) and sample outlet (12) of the sample detection pipeline (10) are exposed outside the housing (50), wherein the sample inlet (11) is on top and the sample outlet (12) is on the bottom, so that the fluid flows obliquely from top to bottom.

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