Online Measurement and System for Mixed Particle Mass Concentration Based on Multi-Angle Light Scattering Method

Abstract

This invention belongs to the field of oil pollutant concentration monitoring technology and discloses an online measurement method and system for the mass concentration of mixed particles based on multi-angle light scattering. The method includes: calculating the standard residuals of the mass concentrations of n types of particulate matter based on a mass sensitivity matrix calibrated at l detection angles; selecting n angle detection groups based on the principle of minimum comprehensive residuals; passing oil carrying n types of mixed particles through the measurement area of ​​an optical measurement system; collecting the scattered light signals of the mixed particles at n detection angles according to the n multi-angle detection groups; correcting the signals using a reference light module; combining the corrected values ​​of the scattered light signals at the n angles with the calibrated mass sensitivity matrix to calculate the mass concentration of each component of the mixed particles, thereby obtaining the mass concentration of a major category of particles in the oil. This invention achieves simultaneous online measurement of the mass concentrations of various types of particles in mixed particles, exhibiting good feasibility and stability.

Description

Technical Field

[0001] This invention relates to the field of oil pollutant concentration monitoring technology, and more specifically to an online measurement and system for the mass concentration of mixed particles based on multi-angle light scattering method. Background Technology

[0002] Currently, aircraft engines primarily use No. 3 jet fuel, hereinafter referred to as RP-3. Excessive concentration of particulate matter and water content in RP-3 can seriously affect safe flight. The concentration of particulate matter and water content in RP-3 are important criteria for judging the quality of the fuel. Solid impurities and water particles in RP-3 can cause different types of damage to the engine; therefore, numerous authoritative organizations and current standards have imposed strict limits on the content of these two types of particles.

[0003] During the RP-3 fueling process for aero-engines, both solid impurities and water exist in the form of fine particles. Currently, commonly used methods for detecting particulate matter concentration include the filter membrane weighing method, light scattering method, extinction method, beta-ray attenuation method, and micro-balance oscillation method. The filter membrane weighing method... β X-ray attenuation method and micro-oscillation balance method have high measurement accuracy, but poor real-time performance and can only detect solid particle concentration. Extinction method has good real-time performance, but it has large errors when detecting low concentration particles, and its measurement accuracy is not as good as light scattering method. Light scattering method has the advantages of accurate measurement, high sensitivity, good real-time performance and non-contact measurement. It can also detect the content of solid particles, droplets and bubbles in the medium, and is suitable for the simultaneous online measurement of solid particle mass concentration and water content in RP-3.

[0004] Furthermore, the solid impurities in RP-3 are complex, including rust, silica, activated carbon, clay, and powdery dust. Detecting the mass concentration of each component of solid impurities in RP-3 is beneficial for timely detection and pinpointing the storage and transportation stages that may cause quality problems. In addition, the accuracy of light scattering methods for measuring particulate matter mass concentration is affected by changes in particle refractive index. When the composition of solid particles changes, the refractive index of the solid particles will inevitably change, thus causing unpredictable errors in the measurement results. Therefore, measuring the mass concentration of various particles in solid impurities is also of great significance.

[0005] Patent application CN 108645817 A discloses an online method for measuring the mass concentration of multi-type mixed particulate matter. This invention is based on the differences in scattered light at different wavelengths caused by particle types. The scattered light signal needs to be split before being received by the detector, resulting in a complex optical path and high cost. This new method, based on the differences in scattered light characteristics of particle types in different scattering directions, calculates the mass concentration of each component in the mixed particles by calibrating a mass sensitivity matrix. It determines the selection of multiple angles based on the principle of minimizing residuals, performs decoupling calculations using the collected multi-angle scattered light signals of the mixed particles, and uses a reference optical path module to feed back environmental fluctuations to correct the scattered light signals detected from multiple angles. This allows for the determination of the mass concentration of multiple components in the mixed particles, ultimately yielding the concentration of a specific class of mixed particles, thus improving measurement accuracy. Summary of the Invention

[0006] To achieve simultaneous online measurement of the mass concentration of each component in the mixed particles of RP-3 contaminants during the refueling process, and simultaneously measure the mass concentration of solid particles, this invention provides an online measurement and system for the mass concentration of mixed particles based on multi-angle light scattering. The system uses mass sensitivity to characterize the relationship between the particle mass concentration and the scattered light signal at a certain detection angle, and proposes a method for simultaneous online detection of the mass concentration of mixed particles based on multi-angle light scattering.

[0007] To achieve the above objectives, the following technical means are specifically adopted in accordance with the purpose of this invention:

[0008] An online measurement method for the mass concentration of mixed particles based on multi-angle light scattering includes:

[0009] in accordance with The mass sensitivity matrix calibrated at each detection angle is calculated to obtain... The standard residuals of particulate matter mass concentrations are selected based on the principle of comprehensive minimum residuals. An angle detection group;

[0010] Will carry Oil particles of various mixtures are sampled through the measurement area of ​​the optical measurement system, based on n multi-angle detection groups. The scattered light signal of the mixed particles at each detection angle is corrected by the reference light module;

[0011] Will By combining the correction values ​​of the scattered light signals at each angle with the calibrated mass sensitivity matrix, the mass concentration of each component of the mixed particles is calculated, and thus the mass concentration of a certain class of particles in the oil is obtained.

[0012] As a further improvement of the present invention, the The mass sensitivity matrix calibrated at each detection angle includes:

[0013] Based on the known mass concentration A mixed particle solution was used to collect data covering forward, lateral, and backward scattering angles. The scattered light signals of mixed particles at various detection angles were used to calibrate the mass sensitivity of each particle at multiple detection angles, and a system was established. Mass sensitivity matrix of the particle under test at each detection angle.

[0014] As a further improvement to the present invention, the mass sensitivity matrix should include the mass sensitivity matrix for each type of particle in the oil. Mass sensitivity at various detection angles; oil contains n For particulate matter, it should meet the following requirements. And the rank of the mass sensitivity matrix should be n .

[0015] when When the value is 3, that is, when measuring the mass concentration of rust, quartz, and free water particles, based on the principle of comprehensive minimum residual, three angles of 11°, 60°, and 120° are selected as the detection group; when When the value is 2, that is, when measuring the mass concentration of solid particles and water particles, according to the principle of comprehensive minimum residual, two angles, 11° and 60°, are selected as the detection group.

[0016] As a further improvement of the present invention, the reference optical module incorporates random fluctuations caused by factors affecting the operation of the laser in the reference optical path to correct the collected scattered light signal. For real-time reference optical signal, This is the average value of the reference signal.

[0017] As a further improvement of the present invention, the correction via the reference optical module includes:

[0018] The real-time reference optical signal detected is The average value of the reference signal is Real-time scattered light signal The average value of the scattered light signal is Therefore, the real-time optical signal of transmitted light It can be represented as: ,in The relative fluctuation of transmitted light is related to the beam splitter ratio, which is a constant after the beam splitter is selected. -1, then the corrected scattered light signal With real-time scattered light signal The relationship is: The reference light module is used to control fluctuations caused by light source power and environmental factors.

[0019] As a further improvement of the present invention, then The calibration process for the sensitivity matrix of particle mass is as follows:

[0020] Given the first j For a given type of particulate matter, a multi-angle scattered light acquisition module was used to acquire the scattered light signals of this type of particulate matter at a known mass concentration. After correction by a reference light, these signals were denoted as follows: Based on the proportional relationship between particulate matter mass concentration and scattered light signal, a fitting was performed. The mass sensitivity matrix of this type of particle at each detection angle [ ], where the fitting relationship expression is , For the first The mass concentration of the particulate matter, Indicates the number of detection angles;

[0021] Then the mass sensitivity is The matrix is ​​expressed in the following form:

[0022] .

[0023] As a further improvement of the present invention, the selection based on the principle of minimum residual is... An angle detection group, including:

[0024] according to The mass sensitivity matrix calibrated at each detection angle is used to calculate the mass sensitivity matrix at different detection angles. The measured mass concentration of the mixed particles was characterized by standard residuals. The deviation between the calculated concentration of each particulate matter at each detection angle and the known configured concentration is selected based on the smallest overall standard residual. A set of detection angles is used as the detection angle group for the online measurement process.

[0025] As a further improvement of the present invention, the calculation of the mass concentration of each component of the mixed particles, and thus the mass concentration of a certain class of particles in the oil, includes:

[0026] Oil Carrying Test n The mixed particulate matter passes through the measurement area of ​​the optical measurement system. Under illumination by the light source, the mixed particulate matter emits scattered light signals. Based on the principle of minimum standard residual, a set of detection angles is selected, and data is collected. n The scattered light signals at each angle are corrected by the reference optical module to obtain the corrected multi-angle scattered light intensities, which are denoted as follows: ,in For the mixed particles in the first Correction values ​​for the scattered light signal at each detection angle;

[0027] Oil particles contain The components, with their mass concentrations denoted as follows: Then the mixed particles Corrected scattered light signal at each detection angle and The relationship between the mass concentration of the seeds is as follows:

[0028]

[0029] The above system of linear equations can be represented in matrix form as follows:

[0030]

[0031] make:

[0032] , ,

[0033] Then we have:

[0034]

[0035] Based on the matrix operations above, by detecting the scattered light signal and the mass sensitivity matrix from multiple angles, the results at different angles can be obtained. The mass concentration of each type of particle is determined, and thus the mass concentration of a certain class of particles in the oil is obtained.

[0036] An online measurement system for the mass concentration of mixed particles based on multi-angle light scattering method includes: a light source module, a measurement area, a multi-angle scattered light acquisition module, a light trap, a reference optical path, and a data acquisition system;

[0037] The light source module includes a He-Ne laser, a beam expander, and a first variable aperture arranged in sequence.

[0038] The multi-angle scattered light acquisition module includes multiple acquisition units, each of which includes a second variable aperture, a lens, and a first silicon photodetector arranged in sequence, with the multiple acquisition units arranged around the area to be measured;

[0039] The reference optical path includes a beam splitter prism and a second silicon photodetector, the second silicon photodetector collecting the light emitted by the beam splitter prism;

[0040] The light trap is positioned on the outgoing light beam in the area being measured.

[0041] The data acquisition system is electrically connected to the reference optical path and the multi-angle scattered light acquisition module.

[0042] A working method for an online measurement system of mixed particle mass concentration based on multi-angle light scattering includes:

[0043] After the electric turntable rotates the measuring optical arm to a determined detection angle, the He-Ne laser emits an incident beam. After the beam is expanded and the divergence angle is reduced by the beam expander, the first variable aperture filters out some weak light, forming a monochromatic parallel beam with uniform energy. Then, the beam is split into a reference beam and a measurement beam by the beam splitter. The reference beam is received by the second silicon photodetector, and the measurement beam is incident on the sample cell, causing the particle group to emit scattered light. The first silicon photodetector transmits the scattered signal to the data acquisition system, and the transmitted measurement light is received by the light trap.

[0044] After the scattered light signals are acquired and corrected by the multi-angle scattered light detection module, they are transmitted to the central control station for processing and calculation to obtain online measurements of the mass concentration of various types of particulate matter.

[0045] In general, the technical solution conceived in this invention can achieve the following beneficial effects compared with the prior art:

[0046] This invention is based on the differences in the angular distribution characteristics of scattered light from different types of particles in different directions. It calibrates the mass sensitivity matrix of each component particle at multiple angles (forward, lateral, and backward) using a mixed solution with known mass concentrations. By comprehensively considering the principle of minimum standard residual, the optimal detection angle group is selected, and the scattered light signal of the oil mixture particles to be tested is collected. Simultaneously, a reference optical module is used to correct system fluctuations. Based on the calibrated mass sensitivity matrix, the mass concentration of each component particle in RP-3 is decoupled, thereby achieving simultaneous detection of the mass concentration of solid impurities and water content in RP-3. This also helps to promptly identify and locate storage and transportation links that cause RP-3 quality problems, ensuring the normal operation of aviation kerosene engines. Attached Figure Description

[0047] Figure 1 This is a schematic diagram illustrating the principle of online measurement of mixed particle mass concentration based on multi-angle light scattering method.

[0048] Figure 2 This is a schematic diagram of the optical measurement system in this invention;

[0049] Among them, 1-He-Ne laser, 2-beam expander, 3,6-variable aperture, 4-sample cell, 5-light trap, 7-lens, 8,12-silicon photodetector, 9-data acquisition system, 10-computer, 11-beam splitter, 13-motor turntable. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0051] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0052] Reference Figure 1 This invention relates to an online measurement of mixed particle mass concentration based on multi-angle light scattering method, which mainly includes three parts: pre-calibration of particle mass sensitivity at each detection angle, determination of multi-angle detection group based on comprehensive minimum residual, and synchronous online measurement of mass concentration of multiple types of particles.

[0053] The pre-calibration part of the particulate matter mass sensitivity at each detection angle uses multiple types of single-component particulate matter, an optical measurement system, and a central control station. The multiple types of particulate matter are carried by RP-3 and pass through the optical measurement system. The mass sensitivity of each type of particulate matter at each detection angle is obtained by fitting calculation and stored in the central control station.

[0054] The section on determining the multi-angle detection group based on the comprehensive minimum residual involves calculating the standard residual between the calculated concentration and the configured concentration based on the pre-calibrated mass sensitivity matrix, and selecting multiple angles corresponding to the comprehensive minimum residual of each particulate matter as the detection group.

[0055] The synchronous online measurement of the mass concentration of various types of particulate matter is the actual measurement device, which uses the optical measurement system, the mixed particulate matter carried by RP-3, and the central control station. The mixed particulate matter, carried by RP-3, passes through the measurement area of ​​the optical measurement system. Under the illumination of the light source, the mixed particulate matter emits scattered light in all directions. The corresponding signal is then acquired by the multi-angle scattered light acquisition module determined by the comprehensive minimum residual. After correction by the reference light signal, the corrected scattered light signal is decoupled and calculated by the central control station to obtain the mass concentration of the particulate matter of the specified type.

[0056] The optical measurement system includes a light source module, a measurement area, a multi-angle scattered light acquisition module, a light trap, a reference optical path, and a data acquisition system. The measurement area includes an electric turntable and a dynamic circulating sample device, which dynamically and in real time reflects the flow rate of the oil to be measured through a flow meter.

[0057] The central control station establishes a communication connection with the optical measurement system and has functions for data storage, calculation, result display, result feedback, and parameter setting.

[0058] To further illustrate the intended purpose, technical solution, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the specific embodiments described below are only for explaining the present invention and are not intended to limit the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0059] The method includes the following steps:

[0060] 1) A reference optical path is introduced to feed back the fluctuation noise caused by environmental factors and to correct the multi-angle scattered light signals collected;

[0061] 2) Based on the mixed particle solution with known mass concentration, select multiple detection angles, covering forward, side and back scattering angles, calibrate the mass sensitivity of the particles under test at each detection angle, and establish the mass sensitivity matrix of each particle under test at each detection angle.

[0062] 3) Calculate the standard residuals of each particle at different angles based on the mass sensitivity matrix calibrated in step 2), and select a multi-angle detection group based on the principle of comprehensive minimum residual;

[0063] 4) The mixed particles to be tested are carried into the optical measurement system by the oil. The scattered light signals of the mixed particles at multiple angles are collected according to the multi-angle detection group determined in step 3), and after being corrected by the reference light module, they are transmitted to the central controller.

[0064] 5) The central controller combines the mass sensitivity matrix calibrated in step 2) with the mixed particle corrected scattered light signal collected in step 4) to calculate the mass concentration of each particle in the mixed particle solution (such as quartz particles, rust particles, clay particles, dust particles, free water particles, etc. in aviation kerosene). Then, the mass concentration of a certain class of particles (such as solid particles and water particles) can be calculated by summation.

[0065] This invention is based on the differences in the angular distribution characteristics of scattered light caused by different particle types. It calculates the mass concentration by calibrating the mass sensitivity matrix and determines multiple detection angles according to the principle of comprehensive minimum residual. It collects scattered light signals from multiple angles, realizing the synchronous online measurement of the mass concentration of various particles in mixed particles. At the same time, it uses a reference light module to overcome the influence of laser power fluctuations, collector signal fluctuations, and stray light fluctuations in the surrounding environment on the light scattering method for measuring particle mass concentration, and has good feasibility and stability.

[0066] To achieve the above objectives, combined with Figure 1 This invention provides a method for simultaneous online detection of the mass concentration of mixed particles based on multi-angle light scattering. The measurement steps of this method are as follows:

[0067] 1) The power fluctuations of the laser during operation, as well as random fluctuations caused by environmental vibrations, temperature, polarization optical components, and reflected light, are introduced into the reference optical path to correct the collected scattered light signal. For real-time reference optical signal, The average value of the reference signal;

[0068] 2) Based on the known mass concentration n A mixed particle solution was selected. The detection angles cover forward, side and back scattering angles. The mass sensitivity of the particle under test is calibrated at each detection angle, and the mass sensitivity matrix of the particle under test is established at each detection angle.

[0069] 3) Based on The mass sensitivity matrix calibrated at each detection angle is calculated to obtain... The standard residuals of the particulate matter mass concentrations were selected based on the principle of comprehensive minimum residuals. Angle detection groups (for rust, quartz, and free water particles, three angles of 11°, 60°, and 120° are selected as detection groups based on the principle of comprehensive minimum residual; for solid particles and water particles, two angles of 11° and 60° are selected as detection groups based on the principle of comprehensive minimum residual).

[0070] 4) The RP-3, carrying solid impurities and water particles, is passed through the measurement area of ​​the optical measurement system. The multi-angle scattered light acquisition module is used to collect data from the multi-angle detection group. nThe scattered light signals of the mixed particles at each detection angle were compared with the reference light signal and denoted as follows: ,in For the mixed particles in the first Correction values ​​for the scattered light signal at each detection angle;

[0071] 5) The multi-angle scattered light acquisition module in the optical measurement system will... n The scattered light signals collected and corrected from each angle are transmitted to the central control station. The central control station combines the received scattered light signals with the mass sensitivity matrix in 2) to solve for the mass concentration of each component in the mixed particles, and then calculates the mass concentration of solid impurities and water content in RP-3.

[0072] It should be noted that the particulate matter mass sensitivity matrix should include the values ​​of each particle in RP-3. Mass sensitivity at each detection angle. Assume RP-3 contains... n For particulate matter, it should meet the following requirements. Then the mass sensitivity is The matrix is ​​selected based on the principle of minimum comprehensive residual. n The scattered light signal of the mixed particles at each detection angle is calculated by decoupling it from the mass sensitivity. n The mass concentration of the particulate matter.

[0073] As an optional embodiment, the n The calibration process for the mass sensitivity matrix of particulate matter is as follows:

[0074] Based on the known mass concentration n A mixed particle solution was selected. Each detection angle covers forward, lateral, and backward scattering angles; given the first... j For particulate matter of this type, a multi-angle scattered light acquisition module was used to acquire the scattered light signals of this type of particulate matter with known mass concentrations. After correction by a reference light signal, these signals were denoted as follows: Based on the proportional relationship between particulate matter mass concentration and scattered light signal, a fitting was performed. The mass sensitivity matrix of this type of particle at each detection angle [ ], where the fitting relationship expression is , For the first The mass concentration of the particulate matter, This indicates the number of detection angles (e.g., when calibrating the mass sensitivity matrix for rust, quartz, and free water particles, 16 detection angles covering forward, lateral, and backward directions can be selected to collect scattered light signals).

[0075] The matrix expression for mass sensitivity is as follows:

[0076] .

[0077] As an optional embodiment, the selection based on the principle of minimum residual is... n The process for optimizing the detection group at each angle is as follows:

[0078] according to The mass sensitivity matrix was calibrated at each detection angle, and the results were calculated at different detection angles. The measured mass concentration of the mixed particles was characterized by standard residuals. The error between the calculated concentration and the configured concentration of each particulate matter at each detection angle is selected. The particulate matter with the smallest comprehensive standard residual Several angles can be used as multi-angle detection groups in the online measurement process (for example, for mixed particles of rust, quartz and free water, three angles of 11°, 60° and 120° can be selected as detection groups by the principle of comprehensive minimum residual; for solid particles and water particles, two angles of 11° and 60° can be selected as detection groups by the principle of comprehensive minimum residual).

[0079] The process for measuring the mass concentration of mixed particles based on the multi-angle light scattering method is as follows:

[0080] RP-3 carries the test n The mixed particulate matter passes through the measurement area of ​​the optical measurement system. Under illumination by a light source, the mixed particulate matter emits scattered light signals. Based on the principle of minimizing the overall standard residual, the acquisition module selects... n Each angle detector group collects scattered light signals, which, after correction by a reference light signal, are denoted as follows: ,in For the mixed particles in the first Correction values ​​for scattered light signals at each detection angle;

[0081] The mixed particles in RP-3 contain The components, with mass concentrations of respectively The corrected mixed particles Scattered light signal at each detection angle and The relationship between the mass concentration of the seeds is as follows:

[0082]

[0083] The above system of linear equations can be represented in matrix form as follows:

[0084]

[0085] When satisfied And the mass sensitivity is When considering matrix conditions, the principle of selecting the minimum residual should be followed. nThe scattered light signal of the mixed particles at each detection angle can be decoupled from the mass sensitivity calculation to obtain the solution. The mass concentration of each type of particle is determined, and then the mass concentration of solid particles and water content in RP-3 are calculated.

[0086] Reference Figure 2 This invention relates to an online measurement of the mass concentration of mixed particles based on multi-angle light scattering method. Its optical measurement system includes a light source module, a measurement area, a multi-angle scattered light acquisition module, a light trap 5, a reference optical path, and a data acquisition system 9.

[0087] The light source module includes a He-Ne laser 1, a beam expander 2, and a first variable aperture 3 arranged in sequence;

[0088] The multi-angle scattered light acquisition module includes multiple acquisition units. Each acquisition unit includes a second variable aperture 6, a lens 7, and a first silicon photodetector 8 arranged in sequence. The multiple acquisition units are arranged around the area to be measured.

[0089] The reference optical path includes a beam splitter 11 and a second silicon photodetector 12, which collects the light emitted by the beam splitter 11.

[0090] The light trap 5 is positioned on the outgoing light beam in the area being measured;

[0091] The data acquisition system 9 is electrically connected to the reference optical path and the multi-angle scattered light acquisition module.

[0092] The principle of this invention is as follows: First, the scattered light signal is corrected by detecting the reference light signal through the reference optical path. Second, multiple detection angles are selected, covering forward, lateral, and backward scattering angles, to collect the scattered light signals of mixed particles with known concentrations. The mass sensitivity matrix of each component of the mixed particles at each detection angle is calibrated. Then, a multi-angle detection group is selected based on the principle of comprehensive minimum residual. Finally, the corrected values ​​of the scattered light signals of the mixed particles collected by the multi-angle detection group are substituted into the linear equation system to solve for the mass concentration of various particles in RP-3, thereby obtaining the solid particle mass concentration and water content.

[0093] The optical measurement system operates as follows: The first silicon photodetector 8 is placed after the second variable aperture 6 and the lens 7 to form a multi-angle measurement optical arm; after the electric turntable 13 rotates the measurement optical arm to a determined detection angle, the He-Ne laser 1 emits an incident beam, which is expanded and the divergence angle is reduced by the beam expander 2, and then some weak light is filtered out by the first variable aperture 3 to form a relatively ideal monochromatic parallel light with uniform energy. Then, the beam splitter 11 splits the beam into a reference beam and a measurement beam. The reference beam is received by the second silicon photodetector 12, and the measurement beam is incident on the sample cell 4 to cause the particle group to emit scattered light. The first silicon photodetector 8 transmits the scattered signal to the data acquisition system 9, and the transmitted measurement light is received by the light trap 5 to avoid generating new environmental stray light in the dark room.

[0094] During the calibration and measurement processes described above, the scattered light signals are acquired and corrected by the multi-angle scattered light detection module, and then transmitted to the central control station for processing and calculation. The rapid response of the photodetector and the powerful computing capabilities of the central control station ensure the timeliness of the acquisition, processing, and calculation of the scattered light signals, enabling online measurement of the mass concentration of various types of particulate matter.

[0095] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for on-line measurement of mixed particle mass concentration based on multi-angle light scattering method, characterized in that, Comprise: According to The quality sensitivity matrix is calibrated under one detection angle, and the standard residual error of the particle mass concentration is calculated The standard residual error of the particle mass concentration is selected according to the comprehensive minimum residual error principle The angle detection group Will carry Oil particles of various mixtures are sampled through the measurement area of ​​the optical measurement system, based on n multi-angle detection groups. The scattered light signal of the mixed particles at each detection angle is corrected by the reference light module; Will By combining the correction values ​​of the scattered light signals at each angle with the calibrated mass sensitivity matrix, the mass concentration of each component of the mixed particles is calculated, and thus the mass concentration of a certain class of particles in the oil is obtained. The Quality sensitivity matrix calibrated under each detection angle, comprising: According to the known mass concentration of A mixed particle solution, the scattering light signals of the mixed particles at multiple detection angles covering forward, side and back scattering angles are collected, the mass sensitivities of each particle at multiple detection angles are calibrated, and a mass sensitivity matrix of the particles to be measured at multiple detection angles is established. A mixed particle solution, the scattering light signals of the mixed particles at multiple detection angles covering forward, side and back scattering angles are collected, the mass sensitivities of each particle at multiple detection angles are calibrated, and a mass sensitivity matrix of the particles to be measured at multiple detection angles is established. A mixed particle solution, the scattering light signals of the mixed particles at multiple detection angles covering forward, side and back scattering angles are collected, the mass sensitivities of each particle at multiple detection angles are calibrated, and a mass sensitivity matrix of the particles to be measured at multiple detection angles is established. The reference light module corrects the collected scattered light signal, for a real-time reference light signal, is the average value of the reference signal; The angle detection group is selected according to the principle of comprehensive minimum residual error comprises: according to The mass sensitivity matrix calibrated at each detection angle is used to calculate the mass sensitivity matrix at different detection angles. The measured mass concentration of the mixed particles was characterized by standard residuals. The deviation between the calculated concentration of each particulate matter at each detection angle and the known configured concentration is selected based on the smallest overall standard residual. A set of detection angles is used as the detection angle group for the online measurement process.

2. The method according to claim 1, wherein The mass sensitivity matrix should contain the mass sensitivity of each particle in the oil quality at each detection angle; if the oil quality contains n particles, then the following should be satisfied , and the rank of the mass sensitivity matrix should be n ; When When 3, i.e. measuring the mass concentrations of rust, quartz and free water particles, according to the principle of comprehensive minimum residual error, three angles of 11°, 60° and 120° are selected as the detection group; when When 2, i.e. measuring the mass concentrations of solid particles and water particles, according to the principle of comprehensive minimum residual error, two angles of 11° and 60° are selected as the detection group.

3. The method according to claim 1, wherein the method is characterized by, The reference light module correction, comprising: The real-time reference light signal is detected as , the average value of the reference signal is , the real-time scattering light signal is , the average value of the scattering light signal is , and the real-time light signal of the transmitted light is , which can be expressed as: , wherein is related to the splitting ratio of the splitting prism, is a constant value after the splitting prism is selected, the relative fluctuation of the transmitted light is: -1, then the corrected scattering light signal is related to the real-time scattering light signal as: , and the reference light module is used to realize the fluctuation caused by the light source power and environmental factors.

4. The method according to claim 1, wherein The n A calibration process of the sensitivity matrix of particulate matter quality is as follows: Given the j particles, the scattering light signals of the particles with known mass concentration are acquired by using a multi-angle scattering light acquisition module, and are recorded as respectively after being corrected by reference light. According to the proportional relationship between the mass concentration of the particles and the scattering light signals, the mass sensitivity matrix of the particles at detection angles is fitted, wherein the fitting relationship expression is , the mass concentration of the particles, indicates the number of detection angles. The mass sensitivity is then The matrix of the form is given by 。 5. The method according to claim 1, wherein, The calculation of the mass concentration of each component of the mixed particles, and then the mass concentration of a certain class of particles in the oil quality, comprising: Oil Carrying Test n The mixed particulate matter passes through the measurement area of ​​the optical measurement system. Under illumination by the light source, the mixed particulate matter emits scattered light signals. Based on the principle of minimum standard residual, a set of detection angles is selected, and data is collected. n The scattered light signals at each angle are corrected by the reference optical module to obtain the corrected multi-angle scattered light intensities, which are denoted as follows: ,in For the mixed particles in the first Correction values ​​for the scattered light signal at each detection angle; The mixed particles in the oil quality contain A component, the mass concentration is respectively recorded as Then the mixed particles The relationship between the corrected scattered light signal under the one detection angle and the mass concentration of the particles is as follows: The relationship between the corrected scattered light signal under the one detection angle and the mass concentration of the particles is as follows: The above linear equations are expressed in matrix form, that is: Let: ， ， Then: From the above matrix operation, the mass concentration of each particle is solved by multi-angle detection of scattered light signals and the quality sensitivity matrix The mass concentration of each particle is solved, and the mass concentration of a certain class of particles in the oil quality is obtained.

6. A system for on-line measurement of mass concentration of mixed particles based on multi-angle light scattering method, which realizes the method for on-line measurement of mass concentration of mixed particles based on multi-angle light scattering method according to any one of claims 1-5, characterized in that, Comprise: Light source module, measurement area, multi-angle scattered light acquisition module, light trap (5), reference light path and data acquisition system (9); The light source module comprises a He-Ne laser (1), a beam expander (2) and a first variable aperture (3) arranged in sequence; The multi-angle scattered light acquisition module comprises a plurality of acquisition units, each acquisition unit comprising a second variable aperture (6), a lens (7) and a first silicon photodetector (8) arranged in sequence, and the plurality of acquisition units are arranged around the measured area; The reference light path comprises a beam splitter prism (11) and a second silicon photodetector (12), and the second silicon photodetector (12) acquires light emitted by the beam splitter prism (11); The light trap (5) is arranged on the exit light of the measured area; The data acquisition system (9) is electrically connected with the reference light path and the multi-angle scattered light acquisition module.

7. The method of operating a multi-angle light scattering based online mixed particle mass concentration measurement system of claim 6, wherein, After the motorized turntable (13) carries the measurement optical arm to rotate to a certain detection angle, the He-Ne laser (1) emits an incident light beam, which is expanded and the divergence angle is reduced by the beam expander (2), and then the first variable aperture (3) filters out part of the weak light, forming uniform energy monochromatic parallel light, and then the beam splitter prism (11) splits the beam into reference light and measurement light, the reference light is received by the second silicon photodetector (12), the measurement light enters the sample cell (4) to make the particle group emit scattered light, the first silicon photodetector (8) transmits the scattered signal to the data acquisition system (9), and the transmitted measurement light is received by the light trap (5); After the scattered light signal is acquired and corrected by the multi-angle scattered light detection module, it is transmitted to the central control station for processing and calculation to obtain the online measurement of the mass concentration of various types of particulate matter. ​

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