Design method, device and medium of multi-optical path device of water quality on-line monitor

Abstract

This application provides a design method for a multi-optical-path device in an online water quality monitoring instrument, along with computer equipment and a storage medium. The design method includes: calculating the required absorption span value for the analyte; calculating the effective optical path based on the absorption span value, the system information of the analyte, and the relative measurement deviation; calculating the inner diameter of the integrating sphere based on the effective optical path and the parameter information of the integrating sphere; and obtaining the shape of the multi-optical-path device based on the inner diameter of the integrating sphere. Through the above methods, this application can improve the accuracy and reliability of online water quality instruments.

Description

Technical Field

[0001] This application relates to the field of online water quality monitoring instrument technology, and in particular to a design method, equipment and medium for a multi-optical path device of an online water quality monitoring instrument. Background Technology

[0002] Currently, most indicators in the design of multi-path optical devices (ammonia nitrogen, total phosphorus, total nitrogen, nitrate, etc.) are measured based on the principle of spectrophotometry. The core of this method is the Lambert-Beer Law, which states that the concentration of the analyte is proportional to the intensity of absorbance, and the intensity of absorbance is positively correlated with the molar absorptivity and optical path length. Increasing the molar absorptivity and optical path length can improve the accuracy and sensitivity of the detection. Since the molar absorptivity is directly related to the chemical measurement principle, current multi-path optical device designs pay little attention to this aspect. Most industry approaches increase the optical path length by increasing the sample volume or the number of emission cycles. While these methods can improve the optical path length to some extent (by about 1-2 times), the effect is extremely limited, and they also lead to increased waste volume, longer measurement time, and excessively large instrument size. Summary of the Invention

[0003] The purpose of this invention is to propose a design method, computer equipment, and storage medium for a multi-path device of an online water quality monitor, which can solve the problems of insufficient detection limit, inadequate accuracy, and large sample and waste volume in the application of online water quality instruments based on the principle of spectrophotometry in the prior art.

[0004] To address the aforementioned technical problems, this invention provides a design method for a multi-optical-path device in an online water quality monitoring instrument. The multi-optical-path device design method includes: calculating the required absorption span value for the analyte; calculating the effective optical path based on the absorption span value, the system information of the analyte, and the relative measurement deviation; calculating the inner diameter of the integrating sphere based on the effective optical path and the parameter information of the integrating sphere device; and obtaining the shape of the multi-optical-path device based on the inner diameter of the integrating sphere.

[0005] The calculation of the absorbance span value required for the analyte further includes: calculating the absorbance span value based on the detection limit, measurement range, and hardware absorbance signal resolution of the online water quality monitoring instrument, and the expression for the absorbance span value is formula (1): Where ΔA is the absorbance range; α is an empirical coefficient, ranging from 1 to 3; MDL is the detection limit; C max d represents the maximum value to be measured; d represents the resolution of the hardware absorbance signal.

[0006] The step of calculating the effective optical path based on the absorption span value, the system information, and the relative measurement deviation further includes: calculating the effective optical path based on the absorption span value, the molar coefficient of the measurement factor, the overall absorbance of the solution, the scattering angle, and the relative measurement deviation according to the absorption and scattering principles, and the expression for the effective optical path is formula (2): Where Lv is the effective optical path length; ΔA is the absorbance span; MDL is the detection limit; k is the molar absorptivity; and e is the relative deviation when measuring the detection limit.

[0007] The step of calculating the inner diameter of the integrating sphere based on the effective optical path length and the parameter information of the integrating sphere device further includes: calculating the inner diameter of the integrating sphere based on the effective optical path length, the reflectivity and absorptivity of the coating of the integrating sphere, and the diameter of the light-transmitting aperture, combined with the principle of diffuse reflection. The expression for calculating the inner diameter is formula (3): in: Where R is the inner diameter of the integrating sphere; β is the reflectivity of the coating on the integrating sphere; L v σ(λ) is the effective optical path length; σ(λ) is the absorptivity at wavelength λ; and D is the aperture diameter.

[0008] The integrating sphere is a regular sphere.

[0009] The measuring medium inside the integrating sphere is a liquid, and the detection wavelength range of the measuring medium is 200nm~900nm.

[0010] Before calculating the absorbance span value required for the analyte, the method further includes: analyzing the system information of the analyte, wherein the system information includes at least the measurement factor, the measurement principle, and the reaction system.

[0011] To address the aforementioned technical problems, this application also provides a computer device, including a memory and a processor. The memory stores computer-readable instructions, and the processor executes the computer-readable instructions to implement the steps of the design method for the multi-optical path device of the online water quality monitoring instrument as described in any of the above claims.

[0012] To address the aforementioned technical problems, this application also provides a computer-readable storage medium, employing the following technical solution: the computer-readable storage medium stores computer-readable instructions, which, when executed by a processor, implement the steps of the design method for the multi-optical path device of the online water quality monitoring instrument described above.

[0013] Compared with the prior art, the embodiments of this application have the following main advantages: This application provides a design method, computer equipment, and storage medium for a multi-optical path device in an online water quality monitoring instrument. Based on the principle of diffuse reflection, an integrating sphere device is constructed. An algorithm for the inner diameter of the integrating sphere is studied using parameters such as molar absorptivity, effective optical path length, density, coating reflectivity, and transmittance. Based on this algorithm, a model design for the optical path cell of the online water quality instrument is performed. This solves the problems of insufficient detection limits, inadequate accuracy, and large sample and waste volume in the application of online water quality instruments based on spectrophotometry. While improving the accuracy of the online water quality monitoring instrument, it also further reduces secondary pollution, greatly enhancing the stability and adaptability of the online water quality instrument. Attached Figure Description

[0014] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a flowchart illustrating one embodiment of the design method for the multi-optical path device of the online water quality monitoring instrument of this application; Figure 2 This is a schematic diagram of the integrating sphere device for the algorithm model of this application; Figure 3 This is a simulation diagram obtained based on the diffuse reflection principle of the integrating sphere device; Figure 4 This is a schematic diagram of a computer device according to an embodiment of the present application. Detailed Implementation

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising” and “having,” and any variations thereof, in the specification, claims, and foregoing drawings, are intended to cover non-exclusive inclusion. The terms “first,” “second,” etc., in the specification, claims, or foregoing drawings are used to distinguish different objects and not to describe a particular order.

[0017] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0019] Please combine Figure 1 , Figure 1 This is a flowchart illustrating one embodiment of the design method for the multi-optical path device of the online water quality monitoring instrument of this application. Figure 1 The design method for the multi-optical-path device of the online water quality monitoring instrument provided in this application includes the following steps: S100, calculates the required absorbance span value for the analyte.

[0020] It is understood that, in the specific embodiments of this application, before calculating the absorbance span value required for the analyte, i.e., before modeling, it is necessary to further analyze the system information of the analyte. First, based on the method principle of the analyte, the relevant measurement system needs to be analyzed, and the system information includes at least the measurement factor, measurement principle, and reaction system. Of course, other information may be available in other embodiments, which are not specifically limited here.

[0021] Furthermore, after confirming the system information, the effective optical path is calculated based on the absorbance span value, the system information of the analyte, and the relative measurement deviation. Specifically, the required absorbance span value is calculated based on the detection limit, measurement range, and hardware signal resolution information required by the online water quality monitoring instrument, and the expression formula (1) for the absorbance span value is as follows: Where ΔA is the absorbance range value, dimensionless; α is an empirical coefficient, ranging from 1 to 3, dimensionless; MDL is the detection limit, mg / L; C max The maximum value is measured in mg / L; d is the resolution of the hardware absorbance signal, which is dimensionless.

[0022] S200 calculates the effective optical path based on the absorbance span value, the system information of the analyte, and the relative measurement deviation.

[0023] Specifically, based on solution absorption and scattering, the effective optical path is calculated using the absorption span value, the molar coefficient of the measurement factor, turbidity, scattering angle, and measurement relative deviation, and the expression for the effective optical path is formula (2): Where Lv is the effective optical path length, cm; ΔA is the absorbance span value, dimensionless; MDL is the detection limit, mg / L; and k1 is the molar absorptivity, L‧mg. -1 ‧cm -1 τ is the turbidity of the solution, NTU; θ is the scattering angle, the angle between emission and reception, °; ​​e is the relative deviation when measuring the detection limit, dimensionless.

[0024] S300 calculates the inner diameter of the integrating sphere based on the effective optical path length and the parameter information of the integrating sphere device.

[0025] Furthermore, based on the effective optical path, the reflectivity and absorptivity of the coating of the integrating sphere, and the diameter of the aperture, the inner diameter of the integrating sphere is calculated using the principle of diffuse reflection. The expression for calculating the inner diameter is formula (3): in:

[0026] Where R is the inner diameter of the integrating sphere; β is the reflectivity of the coating on the integrating sphere; L v The effective optical path is σ(λ); the absorptivity at wavelength λ is σ(λ); and the aperture diameter is D.

[0027] S400, the shape of the multi-path device is obtained based on the inner diameter of the integrating sphere.

[0028] Furthermore, the inner diameter of the integrating sphere can be calculated using the formulas (1), (2), and (3) above. This allows for the detailed design of the multi-optical-path device based on the inner diameter information of the integrating sphere.

[0029] Furthermore, the integrating sphere in the design method of the multi-optical path device of the online water quality monitoring instrument provided in this application is a regular sphere design, which is not suitable when the integrating sphere is an irregular sphere.

[0030] Furthermore, the embodiments of this application can be applied to measurement media in which the inside of the integrating sphere is liquid, and the detection wavelength of the measurement medium is in the range of 200nm~900nm, specifically 200nm, 550nm, or 900nm, without any specific limitation here.

[0031] In the above embodiments, by employing the principle of diffuse reflection and combining parameters such as the molar absorptivity, effective optical path, density, coating reflectivity, and transmittance of different samples, an algorithm for the inner diameter of the integrating sphere is studied. This algorithm model, combined with the characteristics of the integrating sphere, is used to design a multi-optical-path device, offering the following advantages: a) It can meet the wavelength detection requirements of different monitoring factors; b) It has a low detection limit; c) It requires less sample and waste liquid, thus reducing the time for a single measurement; d) Based on the algorithm model, rapid structural design is possible, and it can solve problems such as insufficient detection limit, inadequate accuracy, and large sample and waste liquid volumes in the application of online water quality instruments based on spectrophotometry. While improving the accuracy of online water quality monitoring instruments, it also further reduces secondary pollution, greatly enhancing the stability and adaptability of online water quality instruments.

[0032] In a specific embodiment of this application, taking the online total phosphorus water quality monitor as an example, the ultraviolet spectrophotometry method is proposed for measurement, with a detection limit of 0.05 mg / L, an empirical coefficient α with an intermediate value of 2, and a maximum measurement value of 7 mg / L; the hardware absorbance signal resolution is 0.002, and the absorbance range can be obtained according to formula (1) as follows: Based on the principle of measuring total nitrogen in water using ultraviolet spectrophotometry, its molar absorptivity is 220 L·mg. -1 ‧cm -1 The detection limit is 0.05 mg / L, the relative deviation of the detection limit signal is 1%, the turbidity is 20 NTU, and the scattering angle is 90°. The effective optical path can be calculated according to formula (2) as follows: When measuring total nitrogen, the system mainly consists of water, so its transmittance is close to 1; the aperture is 2 mm, the integrating sphere coating is made of PTFE, and its reflectance is calculated to be 0.98; using formula (3) and combined with the effective optical path, the diameter of the integrating sphere can be obtained as follows:

[0033] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the integrating sphere device for the algorithm model of this application. Figure 3 This is a simulation diagram based on the diffuse reflection principle of the integrating sphere device. According to specific application scenarios, the algorithm model in this application further illustrates that it can guide the multi-optical-path device of online water quality monitoring instruments, solving problems such as insufficient detection limits, poor accuracy, large sample volumes, and secondary pollution in the use of spectrophotometry, thus greatly improving the accuracy and reliability of online water quality instruments.

[0034] To address the aforementioned technical problems, embodiments of this application also provide a computer device. Please refer to [link / reference needed]. Figure 4 , Figure 4 This is a basic structural block diagram of the computer device in this embodiment.

[0035] The computer device 300 includes a memory 301, a processor 302, and a network interface 303 that are interconnected via a system bus. It should be noted that... Figure 4 Only a computer device 300 with components 301-303 is shown in this document; however, it should be understood that implementation of all shown components is not required, and more or fewer components may be implemented alternatively. Those skilled in the art will understand that the computer device described herein is a device capable of automatically performing numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes, but is not limited to, microprocessors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), embedded devices, etc.

[0036] The computer device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The computer device can interact with the user via a keyboard, mouse, remote control, touchpad, or voice control.

[0037] The memory 301 includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 301 may be an internal storage unit of the computer device 300, such as the hard disk or memory of the computer device 300. In other embodiments, the memory 301 may also be an external storage device of the computer device 300, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. Of course, the memory 301 may also include both internal storage units and external storage devices of the computer device 300. In this embodiment, the memory 301 is typically used to store the operating system and various application software installed on the computer device 300, such as computer-readable instructions for interface calling methods. Furthermore, the memory 301 can also be used to temporarily store various types of data that have been output or will be output.

[0038] In some embodiments, the processor 302 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip. The processor 302 is typically used to control the overall operation of the computer device 300. In this embodiment, the processor 302 is used to execute computer-readable instructions stored in the memory 301 or to process data, such as executing computer-readable instructions for a multi-path device design method.

[0039] The network interface 303 may include a wireless network interface or a wired network interface, which is typically used to establish communication connections between the computer device 300 and other electronic devices.

[0040] In the above embodiments, an integrating sphere device is made based on the principle of diffuse reflection. The inner diameter of the integrating sphere is studied by analyzing parameters such as the molar absorptivity, effective optical path length, density, coating reflectivity, and transmittance. Based on the algorithm, a model design of the optical path cell of the online water quality instrument is carried out. This solves the problems of insufficient detection limit, inadequate accuracy, and large sample and waste liquid volumes in the application of online water quality instruments based on the principle of spectrophotometry. While improving the accuracy of online water quality monitoring instruments, it also further reduces secondary pollution and greatly enhances the stability and adaptability of online water quality instruments.

[0041] This application also provides another embodiment, namely, a computer-readable storage medium storing computer-readable instructions that can be executed by at least one processor to cause the at least one processor to perform the steps of the multi-path device design method described above.

[0042] In the above embodiments, an integrating sphere device is made based on the principle of diffuse reflection. The inner diameter of the integrating sphere is studied by analyzing parameters such as the molar absorptivity, effective optical path length, density, coating reflectivity, and transmittance. Based on the algorithm, a model design of the optical path cell of the online water quality instrument is carried out. This solves the problems of insufficient detection limit, inadequate accuracy, and large sample and waste liquid volumes in the application of online water quality instruments based on the principle of spectrophotometry. While improving the accuracy of online water quality monitoring instruments, it also further reduces secondary pollution and greatly enhances the stability and adaptability of online water quality instruments.

[0043] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods of the various embodiments of this application.

[0044] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A design method for a multi-optical path device in an online water quality monitoring instrument, characterized in that, The multi-optical-path device design method includes: Analyze the system information of the component to be tested, which includes at least the measurement factor, measurement principle, and reaction system; The required absorbance span value for the analyte includes: calculating the absorbance span value based on the detection limit, measurement range, and hardware absorbance signal resolution of the online water quality monitor, and the expression for the absorbance span value is formula (1): Where ΔA is the absorbance range; α is an empirical coefficient, ranging from 1 to 3; MDL is the detection limit; C max The maximum value is measured; d is the hardware absorbance signal resolution. The effective optical path is calculated based on the absorbance span value, the system information of the analyte, and the relative measurement deviation, including: The effective optical path is calculated based on the absorption span value, the molar coefficient of the measurement factor, the relative measurement deviation, and the absorption and Mie scattering principles, and the expression for the effective optical path is formula (2): Among them, L v The effective optical path length is ΔA; the absorbance span is MDL; the detection limit is k; the molar absorptivity is e; the relative deviation when measuring the detection limit is τ; and the scattering angle is θ. The inner diameter of the integrating sphere is calculated based on the effective optical path length and the parameter information of the integrating sphere device, including: Based on the effective optical path, the reflectivity and absorptivity of the integrating sphere coating, and the diameter of the aperture, the inner diameter of the integrating sphere is calculated using the principle of diffuse reflection. The expression for calculating the inner diameter is formula (3): in: Where R is the inner diameter of the integrating sphere; β is the reflectivity of the coating on the integrating sphere; L v The effective optical path length is σ(λ), the absorptivity at wavelength λ is σ(λ), and the aperture diameter is D. The shape of the multi-path device is obtained based on the inner diameter of the integrating sphere.

2. The multi-optical-path device design method according to claim 1, characterized in that, The integrating sphere is a regular sphere.

3. The multi-optical-path device design method according to claim 1, characterized in that, The measuring medium inside the integrating sphere is a liquid, and the detection wavelength range of the measuring medium is 200nm~900nm.

4. A computer device, characterized in that, The device includes a memory and a processor, wherein the memory stores computer-readable instructions, and the processor executes the computer-readable instructions to implement the steps of the design method for a multi-optical-path device as described in any one of claims 1 to 3.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-readable instructions, which, when executed by a processor, implement the steps of the design method for a multi-optical-path device as described in any one of claims 1 to 3.

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