A dual-wavelength Raman-capacitance integrated fertilizer solution component on-line detection device

Abstract

The application relates to a dual-wavelength Raman-capacitance integrated fertilizer solution component on-line detection device. The Raman spectrum detection module and the capacitance sensor module are electrically connected with a controller respectively. The Raman spectrum detection module comprises a Raman probe, an optical switch, a laser light source, a monochromator, a charge coupled device and a Raman spectrum pipeline. The optical switch, the laser light source, the monochromator and the charge coupled device are electrically connected with the controller respectively. The charge coupled device, the monochromator, the laser light source, the optical switch and the Raman probe are electrically connected in sequence. The probe end of the Raman probe is connected with the Raman spectrum pipeline. The capacitance sensor module comprises a interdigital capacitance pipeline. The Raman spectrum pipeline and the interdigital capacitance pipeline have the same inner diameter and are connected at the end. The application combines the dielectric frequency method and the Raman spectrum method, can give full play to the advantages of both methods, can realize comprehensive, on-line and rapid detection of fertilizer solution component information, and lays a foundation for improving the intelligent level of the water and fertilizer integrated system.

Description

Technical Field

[0001] This application relates to the field of agricultural testing equipment technology, and in particular to an online detection device for fertilizer liquid components that integrates dual-wavelength Raman and capacitance. Background Technology

[0002] As a core piece of equipment in modern intelligent agriculture, the real-time detection of fertilizer solution components is crucial for the efficient and precise fertilization of integrated water and fertilizer systems. To meet the needs of integrated water and fertilizer systems for comprehensive, real-time, and accurate monitoring of fertilizer solution components, it is urgent to develop a detection technology that combines rapid response, high sensitivity, and a wide measurement range.

[0003] Existing methods for detecting fertilizer solution components include dielectric frequency analysis, ion-selective electrode analysis, EC-pH analysis, and spectroscopic methods (near-infrared spectroscopy, Raman spectroscopy, etc.). Ion-selective electrode analysis, EC-pH analysis, and near-infrared spectroscopy generally suffer from drawbacks such as long detection times, complex operation, or high costs, and cannot achieve rapid, real-time online detection. Dielectric frequency analysis and Raman spectroscopy are low-cost, simple to operate, and fast. Dielectric frequency analysis can quickly reflect the total ion concentration and the concentration of certain electrolyte ions (such as K⁺, Na⁺, Ca²⁺, etc.), but it is difficult to distinguish other complex fertilizer solution components (such as NO⁻, SO₄²⁻, PO₄³⁻, organic matter, etc.). Raman spectroscopy can detect various fertilizer solution components with Raman activity (such as NO⁻, SO₄²⁻, PO₄³⁻, organic matter, etc.), but its sensitivity for certain electrolyte ions (such as K⁺, Na⁺, Ca²⁺, etc.) is low.

[0004] In summary, existing single detection technologies struggle to balance detection speed, cost, and measurement range, failing to meet the practical needs of integrated water and fertilizer systems for online monitoring of fertilizer solution components. Therefore, combining dielectric frequency analysis with Raman spectroscopy to develop a device and method capable of efficiently and comprehensively detecting various components and their concentrations in fertilizer solutions has significant practical implications and broad application value. Utility Model Content

[0005] To address or partially address the problems existing in related technologies, this application provides a dual-wavelength Raman-capacitor integrated online detection device for fertilizer solution components, which can achieve comprehensive, online, and rapid detection of fertilizer solution component information, laying the foundation for improving the intelligence level of integrated water and fertilizer systems.

[0006] This application provides a dual-wavelength Raman-capacitive integrated online detection device for fertilizer liquid components, including a controller 1, a Raman spectroscopy detection module, and a capacitive sensor module. The Raman spectroscopy detection module and the capacitive sensor module are electrically connected to the controller 1. The Raman spectroscopy detection module includes a Raman probe, an optical switch 4, a laser source 5, a monochromator 6, a charge-coupled device 7, and a Raman spectral channel 8. The optical switch 4, the laser source 5, the monochromator 6, and the charge-coupled device 7 are electrically connected to the controller 1. The charge-coupled device 7, the monochromator 6, the laser source 5, the optical switch 4, and the Raman probe are electrically connected in sequence. The probe end of the Raman probe is connected to the Raman spectral channel 8. The capacitive sensor module includes an interdigitated capacitive channel 9. The Raman spectral channel 8 and the interdigitated capacitive channel 9 have the same inner diameter and are connected at their ends.

[0007] Optionally, in some embodiments, the Raman probe includes Raman probe I2 and Raman probe II3, wherein Raman probe I2 is a probe for detecting 785nm wavelength laser, and Raman probe II3 is a probe for detecting 1064nm wavelength laser.

[0008] Optionally, in some embodiments, the capacitive sensor module further includes an interdigital capacitive sensor 10, which is electrically connected to the controller 1, and has an induction electrode 12 and a drive electrode 13 connected to it.

[0009] Optionally, in some embodiments, the interdigitated capacitive sensor 10 is connected to a conditioning circuit box 11.

[0010] Optionally, in some embodiments, an insulating shielding shell 14 is fitted around the outside of the interdigital capacitive channel 9, and the insulating shielding shell 14 is located outside the interdigital capacitive sensor 10.

[0011] Optionally, in some embodiments, the dual-wavelength Raman-capacitor integrated online detection device for fertilizer components further includes a temperature sensing module. The temperature sensing module includes a temperature sensor 15 and a temperature sensor pipe 16. The temperature sensor pipe 16 has the same inner diameter as the interdigitated capacitor pipe 9 and is connected at its ends. The temperature sensor 15 is connected to the temperature sensor pipe 16 and is electrically connected to the controller 1.

[0012] The technical solution provided in this application may include the following beneficial effects:

[0013] This application combines dielectric frequency method with Raman spectroscopy, which can give full play to the advantages of both methods and realize comprehensive, online and rapid detection of fertilizer liquid composition information, laying the foundation for improving the intelligence level of water and fertilizer integration system;

[0014] This application enables integrated detection of multidimensional components, achieving comprehensive analysis of major ions in fertilizer solutions: It combines a dual-wavelength (785 nm and 1064 nm laser wavelengths) Raman probe with a capacitive sensor, using the Raman probe to detect Raman-active fertilizer components (such as NO3) in the solution. - It can detect electrolyte ions (such as K⁺, Na⁺, Ca²⁺, etc.) in fertilizer solutions that cannot be detected by Raman spectroscopy detection modules, such as SO₄²⁻, PO₄³⁻, and organic molecules. This enables a single device to detect the main components in fertilizer solutions comprehensively and efficiently, and can simultaneously acquire information on multiple categories of components, meeting the needs of smart agriculture for accurate and comprehensive detection of fertilizer solution components.

[0015] This application features an integrated structure with strong field adaptability: the interdigitated capacitive sensor, Raman spectroscopy module and temperature sensor are integrated into the same pipeline detection structure, with a threaded connection installation design, which is convenient for embedding into field equipment such as integrated water and fertilizer machines, and realizes online and continuous monitoring.

[0016] This application's anti-interference design enhances stability: real-time correction of the capacitance sensor output is achieved using temperature sensor data, preventing temperature from interfering with experimental data and significantly improving the accuracy and reliability of the detection data; the capacitance sensor is surrounded by an insulating shielding shell, effectively reducing external environmental interference and ensuring stable and reliable detection results.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0019] Figure 1 This is a schematic diagram of the structure of the dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components shown in Embodiment 1 of this application;

[0020] Figure 2 This is a schematic diagram of the structure of the dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components shown in Embodiment 2 of this application;

[0021] Figure 3 This is a schematic diagram of the structure of the dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components shown in Embodiment 3 of this application.

[0022] Figure label:

[0023] 1-Controller, 2-Raman probe I, 3-Raman probe II, 4-Optical switch, 5-Laser source, 6-Monochromator, 7-Charge-coupled device, 8-Raman spectroscopy tube, 9-Interdigital capacitor tube, 10-Interdigital capacitor sensor, 11-Conditioning circuit box, 12-Induction electrode, 13-Drive electrode, 14-Insulating shielding shell, 15-Temperature sensor, 16-Temperature sensor tube, 17-eDP touch screen display. Detailed Implementation

[0024] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0025] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] To address the aforementioned issues, this application provides a dual-wavelength Raman-capacitor integrated online detection device for fertilizer solution components, which enables comprehensive, online, and rapid detection of fertilizer solution component information, laying the foundation for improving the intelligence level of integrated water and fertilizer systems.

[0029] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0030] Example 1

[0031] See Figure 1 The dual-wavelength Raman-capacitor integrated online fertilizer solution component detection device includes a controller 1, a Raman spectroscopy detection module, and a capacitor sensor module. The Raman spectroscopy detection module and the capacitor sensor module are electrically connected to the controller 1. The Raman spectroscopy detection module includes a Raman probe, an optical switch 4, a laser source 5, a monochromator 6, a charge-coupled device 7, and a Raman spectral channel 8. The optical switch 4, the laser source 5, the monochromator 6, and the charge-coupled device 7 are electrically connected to the controller 1. The charge-coupled device 7, the monochromator 6, the laser source 5, the optical switch 4, and the Raman probe are electrically connected in sequence. The probe end of the Raman probe is connected to the Raman spectral channel 8. The capacitor sensor module includes an interdigitated capacitor channel 9. The Raman spectral channel 8 and the interdigitated capacitor channel 9 have the same inner diameter and are connected at their ends.

[0032] Specifically, controller 1 uses a LattePanda 3 Delta microcontroller equipped with an eDP touch screen 17 to display the detection results in real time. The Raman spectroscopy detection module detects Raman-active fertilizer components (such as NO3⁻, SO4²⁻, PO4³⁻ and organic molecules) in the fertilizer solution and transmits the spectral data to controller 1. The capacitive sensor module collects relevant data on electrolyte ions (such as K⁺, Na⁺, Ca²⁺, etc.) that cannot be detected by the Raman spectroscopy detection module in the fertilizer solution and transmits the data to controller 1.

[0033] The microcontroller used in this device is equipped with a prediction model for the optimal fertilizer solution types and component contents established in the previous stage. It can automatically analyze the integrated fertilizer solution component data and output information on the types and concentrations of various fertilizer solution components. The display screen can show the detection results of various fertilizer solution components in real time, allowing users to keep track of changes in fertilizer solution composition immediately.

[0034] In the specific functional implementation process, the Raman probe (including a collimating lens, filter, condenser lens, and probe) receives the laser emitted from the laser source 5. The collimating lens collimates the laser into parallel light, the filter removes stray light, and the condenser lens focuses the light through the Raman probe to illuminate the detection area through which the fertilizer solution flows. The laser interacts with the fertilizer molecules to generate Raman scattered light. To ensure stable detection, a quartz glass plate is placed between the Raman probe and the fertilizer solution for isolation. The collected Raman scattered light is transmitted via optical fiber to a monochromator 6 for dispersion, then converted into an electrical signal by a charge-coupled device 7 and uploaded to the LattePanda3 Delta microcontroller.

[0035] The microcontroller takes Raman spectroscopy data and characteristic voltage data as input, combines them with a prediction model of optimal fertilizer solution type and component content, outputs complete information on fertilizer solution components, and displays the types and concentrations of various ions and organic molecules in real time on a display.

[0036] In some embodiments, the Raman probe includes Raman probe I2 and Raman probe II3, wherein Raman probe I2 is a probe for detecting 785nm wavelength laser and Raman probe II3 is a probe for detecting 1064nm wavelength laser.

[0037] Specifically, Raman probe I2 is used to collect Raman scattered light after irradiation with a 785nm wavelength laser in the detection area, and Raman probe II3 is used to collect Raman scattered light after irradiation with a 1064nm wavelength laser. Depending on the detection requirements, different wavelengths (785nm or 1064nm) can be selected for Raman signal acquisition via optical switch 4.

[0038] Example 2

[0039] See Figure 2 Based on Embodiment 1, the capacitance sensor module further includes an interdigital capacitance sensor 10, which is electrically connected to the controller 1. The interdigital capacitance sensor 10 is connected to an induction electrode 12 and a drive electrode 13. The interdigital capacitance sensor 10 is connected to a conditioning circuit box 11. An insulating shielding shell 14 is fitted on the outside of the interdigital capacitance pipe 9, and the insulating shielding shell 14 is located outside the interdigital capacitance sensor 10.

[0040] Specifically, the capacitance sensor module applies excitation signals of different characteristic frequencies to the driving electrode 13 and the sensing electrode 12 to form a stable electric field in the detection area, thereby detecting changes in the capacitance of the fertilizer solution. The signal is amplified, denoised, and filtered by the conditioning circuit of the conditioning circuit box 11 to obtain the characteristic voltage parameters of the fertilizer solution components, which are then uploaded to the microcontroller. Based on the temperature data measured by the temperature sensor 10, the microcontroller corrects and compensates the characteristic voltage data using a specific algorithm. The insulating shielding shell 14 prevents interference from the external environment, improving the stability and reliability of the detection.

[0041] Example 3

[0042] See Figure 3 Based on Example 1, the dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components further includes a temperature sensing module. The temperature sensing module includes a temperature sensor 15 and a temperature sensor pipe 16. The temperature sensor pipe 16 has the same inner diameter as the interdigitated capacitor pipe 9 and is connected at the ends. The temperature sensor 15 is connected to the temperature sensor pipe 16 and is electrically connected to the controller 1.

[0043] Specifically, controller 1 corrects and compensates the detection data of capacitive sensor 10 according to a preset algorithm based on the temperature data transmitted in real time by temperature sensor 16, and obtains corrected characteristic voltage data. Subsequently, controller 1 integrates the corrected characteristic voltage data with Raman spectroscopy detection data to form complete raw data of fertilizer solution components.

[0044] Finally, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "contain," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0045] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0046] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components, characterized in that: The dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components includes a controller (1), a Raman spectroscopy detection module, and a capacitor sensor module. The Raman spectroscopy detection module and the capacitor sensor module are electrically connected to the controller (1). The Raman spectroscopy detection module includes a Raman probe, an optical switch (4), a laser source (5), a monochromator (6), a charge-coupled device (7), and a Raman spectral channel (8). The optical switch (4), the laser source (5), the monochromator (6), and the charge-coupled device (7) are electrically connected to the controller (1). The charge-coupled device (7), the monochromator (6), the laser source (5), the optical switch (4), and the Raman probe are electrically connected in sequence. The probe end of the Raman probe is connected to the Raman spectral channel (8). The capacitor sensor module includes an interdigitated capacitor channel (9). The Raman spectral channel (8) and the interdigitated capacitor channel (9) have the same inner diameter and are connected at their ends.

2. The dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components according to claim 1, characterized in that: The Raman probes include Raman probe I (2) and Raman probe II (3). Raman probe I (2) is a probe for detecting 785nm wavelength laser, and Raman probe II (3) is a probe for detecting 1064nm wavelength laser.

3. The dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components according to claim 1 or 2, characterized in that: The capacitance sensor module also includes an interdigital capacitance sensor (10), which is electrically connected to the controller (1). The interdigital capacitance sensor (10) is connected to an induction electrode (12) and a drive electrode (13).

4. The dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components according to claim 3, characterized in that: The interdigitated capacitive sensor (10) is connected to a conditioning circuit box (11).

5. The dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components according to claim 4, characterized in that: An insulating shielding shell (14) is fitted on the outside of the interdigitated capacitor channel (9), and the insulating shielding shell (14) is located outside the interdigitated capacitor sensor (10).

6. The dual-wavelength Raman-capacitor integrated online detection device for fertilizer liquid components according to claim 5, characterized in that: The dual-wavelength Raman-capacitor integrated fertilizer liquid component online detection device also includes a temperature sensing module, which includes a temperature sensor (15) and a temperature sensor pipe (16). The temperature sensor pipe (16) has the same inner diameter as the interdigitated capacitor pipe (9) and is connected at the ends. The temperature sensor (15) is connected to the temperature sensor pipe (16) and is electrically connected to the controller (1).

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