CN113776997A - Atmospheric particulate matter Mueller matrix measurement method with environment interference suppression function - Google Patents
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Abstract
The invention discloses an atmospheric particulate matter Mueller matrix measuring method with environmental interference suppression, which belongs to the field of environmental detection, and is characterized in that an atmospheric particulate matter simulation system and a water mist environment simulation system are utilized to simulate an atmospheric particulate matter environment with a water mist medium covered on the surface, a Mueller matrix test in the vertical direction and an emergent polarization state test in the horizontal direction are simultaneously carried out, the emergent polarization state of the interfering environment in the horizontal path is equivalent to the emergent polarization state of the interfering environment in the vertical path in a mode of ensuring that the length and the height of the uniform water mist environment simulation system are equal, and the defect that the interfering environment cannot be measured is overcome.
Description
Technical Field
The invention belongs to the field of environmental detection, and particularly relates to an atmospheric particulate matter Mueller matrix measurement method for environmental interference suppression.
Background
Serious atmospheric pollution can cause great threat and damage to public health, ecological environment and social economy. In recent years, with the rapid development of economy in China, the process of urbanization and industrialization is accelerated continuously, the concentration of liquid drops and solid particles in urban air is greatly increased due to automobile exhaust, road dust, building construction dust, secondary pollution of factories, low-altitude emission of coal burned in winter and the like, the main environmental problems are mostly particles generated by artificial activities, the indoor waste gas pollution is more serious than that imagined by people, and certain substances outside the room enter the room due to human activities and natural processes to reach sufficient concentration for enough time, so that the harm is generated to human bodies. Therefore, the method is a task with great economic and social values for effectively measuring and monitoring the atmospheric particulates in real time and further controlling and reducing the emission of the particulates.
The atmospheric particulate measurement research mainly focuses on two aspects, one is to measure the particle size distribution of particulate matters so as to obtain the concentration of the particulate matters in a selected particle size interval, and the other is to analyze the composition of the particulate matters so as to analyze the pollution source of the particulate matters, wherein the composition of the particulate matters has the relevance of the particle size distribution. Based on different measurement principles, methods used for detecting atmospheric particulates mainly include a beta ray absorption method, a gravimetric method, a slight vibration balance method, a light scattering method and the like, wherein optical detection has the characteristics of no damage, rapidness and real-time online. With the development of laser light source and detector technology, the optical detection method is more and more widely applied to the atmosphere. Polarized scattering detection is a development on the unpolarized method, and has the characteristics of large amount of information of the obtained particles, high compatibility with the existing unpolarized device, and sensitivity to small-particle-size particles. However, it is impossible to obtain all the optical properties of the medium by merely studying the change of the polarization state, and the mueller matrix is a method capable of sufficiently characterizing the polarization properties of the medium, also called the transfer function of the Stokes vector describing the polarization state of light, and therefore it is of great significance to study the measurement of the particle mueller matrix.
When indoor simulation test, in the detection of vertical direction to atmospheric particulates, because the influence of multilayer environment, the particulate matter surface that awaits measuring generally covers has the sheltering from of other environment, like simulated cloud, fog etc. for the muller matrix of particulate matter can not directly be surveyed. Therefore, an environmental interference suppression method for measuring the atmospheric particulate matters by using the mueller matrix is urgently needed for the situation that other environmental interferences exist on the surface when the mueller matrix test is performed on the particulate matters in the vertical direction.
Disclosure of Invention
The invention aims to solve the problem of shielding of the environment above atmospheric particulates during vertical measurement, and provides an atmospheric particulate Mueller matrix measurement method for inhibiting environmental interference.
The technical scheme adopted by the invention for realizing the purpose is as follows: the method for measuring the atmospheric particulate matter Mueller matrix with the environment interference suppressed is characterized by comprising the following steps in sequence:
step one, early preparation
Placing a Mueller matrix test polarization system and a Mueller matrix test receiving system on the same light path, wherein the Mueller matrix test polarization system is positioned on a vertical path light incidence side of a multilayer environment simulation system, and the Mueller matrix test receiving system is positioned on a vertical path light emergence side of the multilayer environment simulation system;
placing the environmental interference suppression polarizing system and the environmental interference suppression receiving system on the same light path, wherein the environmental interference suppression polarizing system is positioned on the horizontal path light incidence side of the multilayer environmental simulation system, and the environmental interference suppression receiving system is positioned on the horizontal path light emergence side of the multilayer environmental simulation system;
wherein:
the multilayer environment simulation system is divided into an upper layer and a lower layer, the lower layer is an atmospheric particulate simulation system, and the upper layer is a water mist environment simulation system;
the Mueller matrix test polarization system consists of a first laser, a first attenuation sheet, a beam expander, a first linear polarizer and a first quarter-wave plate which are sequentially arranged along the propagation direction of light;
the Mueller matrix test receiving system consists of a second quarter-wave plate, a second linear polarizer and a CCD detector which are sequentially arranged along the propagation direction of light;
the environment interference suppression polarizing system consists of a second laser, a second attenuation sheet, a third line polarizer and a third quarter-wave plate which are sequentially arranged along the propagation direction of light;
the environment interference suppression receiving system comprises a polarization state measuring instrument;
opening a first laser in the Mueller matrix test polarization system, adjusting the brightness of a first attenuation sheet, removing a first quarter-wave plate, and adjusting a first linear polarizer to generate horizontal linear polarized light;
opening a second laser in the environment interference suppression polarizing system, adjusting the brightness generated by a second attenuation sheet to be the same as the brightness generated by the first attenuation sheet in the step one, removing a third quarter-wave plate, and adjusting a third linear polarizer to generate horizontal linear polarization light;
removing a second quarter-wave plate in the Mueller matrix test receiving system, adjusting a second linear polarizer to enable the polarization state of the second linear polarizer to be the same as that of the Mueller matrix test polarization system in the step one, and testing the received light spot patterns during horizontal polarization and horizontal polarization detection;
filling a particulate matter sample to be detected into a lower-layer atmospheric particulate matter simulation system of the multilayer environment simulation system, and filling water mist with different concentrations into an upper-layer water mist environment simulation system, wherein the upper-layer water mist environment simulation system is used for simulating cloud and mist environments under different weather conditions, and the two-layer medium environments are uniform medium environments;
after the medium environment in the multi-layer environment simulation system is stable, respectively receiving light spot patterns of two layers of media in the vertical direction by a CCD detector in the Mueller matrix test receiving system and receiving an emergent Stokes vector of an upper-layer water mist interference environment by a polarization state measuring instrument in the environment interference suppression receiving system, and recording;
step seven, repeating the step one to the step six, and adjusting a first linear polarizer and a first quarter-wave plate in the Mueller matrix test polarization system to sequentially generate horizontal polarized light, vertical polarized light, linear polarized light with +45 degrees and-45 degrees, and left-handed and right-handed polarized light; adjusting a second quarter-wave plate and a second linear polarizer in the Mueller matrix test receiving system, sequentially detecting horizontal polarized light, vertical polarized light, linear polarized light with +45 degrees, linearly polarized light with-45 degrees, right-handed polarized light and left-handed polarized light, combining thirty-six polarization and polarization detection, and receiving a light intensity pattern by a CCD detector;
step eight, adjusting a third linear polarizer and a third quarter wave plate in the environment interference suppression polarization system to enable the polarization state generated by the environment interference suppression polarization system to be the same as the polarization state in the Mueller matrix test polarization system, wherein six polarization states are counted, and six groups of Stokes vectors transmitted by the interference environment are received by a polarization state measuring instrument respectively;
and step nine, multiplying the polarization state of the polarization state adjusted in the seven-Mueller matrix test receiving system by the particle Mueller matrix and the six groups of Stokes vectors measured in the step eight, and solving the light intensity pattern received by the thirty-six groups of CCD detectors correspondingly measured in the step seven, so as to obtain sixteen elements in the atmospheric particle Mueller matrix.
Further, the atmospheric particulate matter simulation system and the water mist environment simulation system are the same in length and are arranged in length alignment; the water mist environment simulation system is the same in length and height, vertical optical windows are arranged on the vertical atmospheric particulate matter simulation system and the water mist environment simulation system, the central axes of the vertical optical windows of the atmospheric particulate matter simulation system and the water mist environment simulation system coincide, and a horizontal optical window is arranged on the horizontal water mist environment simulation system.
Through the design scheme, the invention can bring the following beneficial effects: aiming at the problem that the surface of a particulate matter to be detected is covered with environment such as cloud and fog in the process of detecting the atmospheric particulate matter in the vertical direction when a complex atmospheric environment is simulated indoors, the Mueller matrix measuring method for the atmospheric particulate matter with environmental interference suppression is provided, the atmospheric particulate matter environment with the surface covered with a water fog medium is simulated by using an atmospheric particulate matter simulation system and a water fog environment simulation system, the Mueller matrix test in the vertical direction and the emergent polarization state test in the horizontal direction are simultaneously carried out, the emergent polarization state of the interfering environment on the horizontal path is equivalent to the emergent polarization state of the interfering environment on the vertical path in a mode of ensuring the length and the height of a uniform water fog environment simulation system to be equal, the defect that the interfering environment cannot be measured is overcome, thirty-six combined light intensity patterns of six groups of polarization and six groups of detection polarization are obtained, and the light intensity patterns are substituted into a relational formula of the Mueller matrix and the light intensity to obtain the Mueller matrix of the atmospheric particulate matter, the method enables the Mueller matrix test of the shielded particulate environment to be possible, solves the problem of environmental interference suppression in the Mueller matrix test process, and provides technical support for high-precision test of the medium Mueller matrix.
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The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention to the right, and in which:
fig. 1 is a schematic structural diagram of an optical system based on the atmospheric particulate mueller matrix measurement method for environmental interference suppression.
The respective symbols in the figure are as follows: the system comprises a 1-multilayer environment simulation system, a 2-Mueller matrix test polarization system, a 3-Mueller matrix test receiving system, a 4-environment interference suppression polarization system, a 5-environment interference suppression receiving system, an 11-atmospheric particulate matter simulation system, a 12-water mist environment simulation system, a 21-first laser, a 22-first attenuation sheet, a 23-beam expander, a 24-first linear polarizer, a 25-first quarter-wave plate, a 31-second quarter-wave plate, a 32-second linear polarizer, a 33-CCD detector, a 41-second laser, a 42-second attenuation sheet, a 43-third linear polarizer, a 44-third quarter-wave plate and a 51-polarization state measuring instrument.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the present invention is not limited by the following examples, and specific embodiments can be determined according to the technical solutions and practical situations of the present invention. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
The invention provides an atmospheric particulate matter Mueller matrix measurement method for environmental interference suppression, and as shown in FIG. 1, an optical system based on the method comprises the following steps: the system comprises a multilayer environment simulation system 1, a Mueller matrix test polarization system 2, a Mueller matrix test receiving system 3, an environmental interference suppression polarization system 4 and an environmental interference suppression receiving system 5;
the multilayer environment simulation system 1 consists of an atmospheric particulate matter simulation system 11 and a water mist environment simulation system 12, the atmospheric particulate matter simulation system 11 and the water mist environment simulation system 12 are of rectangular box structures in external shapes, the atmospheric particulate matter simulation system 11 is arranged on the lower layer of the multilayer environment simulation system 1, the water mist environment simulation system 12 is arranged on the upper layer, the two boxes are identical in length and are arranged in alignment with each other in length, and the water mist environment simulation system 12 is a box body identical in length and height, so that the paths passing in the horizontal direction and the vertical direction are equal; vertical optical windows are arranged on the atmospheric particulate simulation system 11 and the water mist environment simulation system 12 in the vertical direction and used for testing a medium Mueller matrix in the vertical direction, and horizontal optical windows are arranged on the water mist environment simulation system 12 in the horizontal direction and used for testing an environment interference system in the horizontal direction; the central axes of the vertical optical window and the horizontal optical window of the multilayer environment simulation system 1 are not crossed, so that the two light beams are ensured not to interfere with each other in the propagation process;
the muller matrix testing polarization system 2 is located on the vertical path light incidence side of the multilayer environment simulation system 1, the muller matrix testing polarization system 2 is composed of a first laser 21, a first attenuation sheet 22, a beam expander 23, a first linear polarizer 24 and a first quarter-wave plate 25 which are sequentially arranged along the propagation direction of light, the muller matrix testing polarization system 2 is used for generating expanded horizontal, vertical, + 45-degree and-45-degree linearly polarized light and left-handed and right-handed circularly polarized light, the first laser 21 is a 532nm laser, and the water mist penetrating effect is good;
the muller matrix test receiving system 3 is located at the light emergent side of the vertical path of the multilayer environment simulation system 1, the muller matrix test receiving system 3 is composed of a second quarter-wave plate 31, a second linear polarizer 32 and a CCD detector 33 which are sequentially arranged along the propagation direction of light, and the muller matrix test receiving system 3 is used for receiving light intensity patterns received in the horizontal, vertical, +45 degree, -45 degree linear polarization analyzing directions and the left-handed and right-handed circular polarization analyzing directions;
the environment interference suppression polarization system 4 is positioned on the horizontal path light incidence side of the multilayer environment simulation system 1, the environment interference suppression polarization system 4 is composed of a second laser 41, a second attenuation sheet 42, a third linear polarizer 43 and a third quarter-wave plate 44 which are sequentially arranged along the propagation direction of light, and the environment interference suppression polarization system 4 is used for generating horizontal, vertical, + 45-degree and-45-degree linearly polarized light and left-handed and right-handed circularly polarized light as polarization for interference environment test; the 532nm laser is selected as the second laser 41, so that the water mist can penetrate well;
the environmental interference suppression receiving system 5 is located at the light emitting side of the horizontal path of the multilayer environmental simulation system 1, and the environmental interference suppression receiving system 5 includes a polarization state measuring instrument 51 for testing each Stokes component of the interference environment;
the specific environment interference suppression atmospheric particulate matter Mueller matrix measurement method comprises the following steps:
step one, early preparation
Placing a Mueller matrix test polarization system 2 and a Mueller matrix test receiving system 3 on the same light path, wherein the Mueller matrix test polarization system 2 is positioned on a vertical path light incidence side of the multilayer environment simulation system 1, and the Mueller matrix test receiving system 3 is positioned on a vertical path light emergent side of the multilayer environment simulation system 1;
placing the environmental interference suppression polarizing system 4 and the environmental interference suppression receiving system 5 on the same light path, wherein the environmental interference suppression polarizing system 4 is positioned on the horizontal path light incidence side of the multilayer environmental simulation system 1, and the environmental interference suppression receiving system 5 is positioned on the horizontal path light emergent side of the multilayer environmental simulation system 1;
opening the first laser 21 in the polarization system 2 for the Mueller matrix test, adjusting the brightness of the first attenuation sheet 22 to be the same as that of the second attenuation sheet 42, removing the first quarter-wave plate 25, and adjusting the first linear polarizer 24 to generate horizontal linear polarized light;
step three, opening a second laser 41 in the environment interference suppression polarizing system 4, adjusting the brightness generated by a second attenuation sheet 42 to be the same as the brightness generated by a first attenuation sheet 22, removing a third quarter-wave plate 44, and adjusting a third linear polarizer 43 to generate horizontal linear polarized light;
removing the second quarter-wave plate 31 in the mueller matrix test receiving system 3, adjusting the second linear polarizer 32 to enable the polarization state of the second quarter-wave plate to be the same as that of the polarization state in the mueller matrix test polarization system 2, and testing the light spot patterns received during horizontal polarization and horizontal polarization analysis;
filling a particulate matter sample to be detected into a lower-layer atmospheric particulate matter simulation system 11 of the multilayer environment simulation system 1, filling water mist with different concentrations into an upper-layer water mist environment simulation system 12, and using the water mist environment simulation system to simulate cloud and mist environments under different weather conditions, wherein media in the atmospheric particulate matter simulation system 11 and the water mist environment simulation system 12 are uniformly stirred by a fan, so that the two layers of medium environments are uniform;
after the medium environment in the multilayer environment simulation system 1 is stable, respectively receiving the light spot patterns of two layers of media in the vertical direction and the emergent stokes vector of the upper-layer water mist interference environment by the CCD detector 33 in the Mueller matrix test receiving system 3 and the polarization state measuring instrument 51 in the environment interference suppression receiving system 5, and recording;
step seven, repeating the step one to the step six, and adjusting the first linear polarizer 24 and the first quarter-wave plate 25 in the Mueller matrix test polarization system 2 to sequentially generate horizontal polarized light, vertical polarized light, linear polarized light with +45 degrees and-45 degrees, and left-handed and right-handed polarized light; adjusting a second quarter-wave plate 31 and a second linear polarizer 32 in the muller matrix test receiving system 3, sequentially detecting horizontal, vertical, + 45-degree, -45-degree linearly polarized light, right-handed circularly polarized light and left-handed circularly polarized light, combining thirty-six polarization and polarization detection groups in total, and receiving a light intensity pattern by a CCD detector 33;
correspondingly, adjusting a third linear polarizer 43 and a third quarter-wave plate 44 in the environmental interference suppression polarization system 4 to ensure that the generated polarization state is the same as the polarization state in the mueller matrix test polarization system 2, wherein six polarization states are counted, and six groups of stokes vectors after interference environment transmission are respectively received by the polarization state measuring instrument 51;
and step nine, multiplying the polarization state of the polarization state adjusted in the seven-Mueller matrix test receiving system 3 by the particle Mueller matrices and the six groups of Stokes vectors measured in the step eight, and solving the light intensity patterns received by the thirty-six groups of CCD detectors 33 correspondingly measured in the step seven to obtain sixteen elements in the atmospheric particle Mueller matrices.
For example, the following steps are carried out:
if the horizontal offset is adjusted in the mueller matrix test receiving system 3 in the step seven, the mueller matrix generated by the offset can be expressed as
If the particle Mueller matrix is expressed as
S′11～S′44For each element in the mueller matrix, the stokes vector received by the polarization state measuring instrument 51 in the environmental interference suppression receiving system 5 in step eight is [ I1 Q1U1 V1]TIn which I1As a total light intensity, Q1Representing the difference between the intensities of the x-and y-axis polarization, U1Denotes the difference, V, between the intensity of polarization in the direction of 45 DEG to the x-axis in the xoy plane and the intensity of polarization in the direction of-45 DEG to the x-axis in the xoy plane1Then represents the intensity difference between the left-and right-hand circularly polarized components of the light; and the light intensity pattern received by the CCD detector 33 in the seven-step mueller matrix test receiving system 3 is I'1Then there is
Wherein, [ I'1 Q′1 U′1 V′1]TA stokes vector emitted after the second linear polarizer 32 in the receiving system 3 is tested by the mueller matrix in the step seven; wherein I'1Is emergent total light intensity, Q'1U 'representing the difference between the intensities of the x-axis polarization and the y-axis polarization of the emitted light'1Represents the difference between the polarized intensity of the emergent light in the 45 degree direction and the polarized intensity in the-45 degree direction, V1' then represents the intensity difference between the left and right circular polarization components of the emerging light;
then there is
I′1＝(S′11-S′21)·I1+(S′12-S′22)·Q1+(S′13-S′23)·U1+(S′14-S′24)·V1Wherein, I'1And the Stokes vector [ I ] received by the polarization state measuring instrument 511 Q1 U1 V1]TAs is known, thirty-six combinations are obtained by receiving six groups of stokes vectors transmitted in the interference environment by the polarization state measuring instrument 51 and six groups of polarization states adjusted in the seven-mueller matrix test receiving system 3, thirty-six groups of light intensity patterns are received by the CCD detector 33, and the mueller matrices filled with particles in the atmospheric particulate simulation system 11 are obtained by simultaneous solution of thirty-six groups of equations.
Claims (2)
1. The method for measuring the atmospheric particulate matter Mueller matrix with the environment interference suppressed is characterized by comprising the following steps in sequence:
step one, early preparation
Placing a Mueller matrix test polarization system (2) and a Mueller matrix test receiving system (3) on the same light path, wherein the Mueller matrix test polarization system (2) is positioned on the vertical path light incidence side of the multilayer environment simulation system (1), and the Mueller matrix test receiving system (3) is positioned on the vertical path light emergence side of the multilayer environment simulation system (1);
placing the environmental interference suppression polarizing system (4) and the environmental interference suppression receiving system (5) on the same light path, wherein the environmental interference suppression polarizing system (4) is positioned on the horizontal path light incidence side of the multilayer environmental simulation system (1), and the environmental interference suppression receiving system (5) is positioned on the horizontal path light emergent side of the multilayer environmental simulation system (1);
wherein:
the multilayer environment simulation system (1) is divided into an upper layer and a lower layer, the lower layer is an atmospheric particulate simulation system (11), and the upper layer is a water mist environment simulation system (12);
the Mueller matrix test polarization system (2) is composed of a first laser (21), a first attenuation sheet (22), a beam expander (23), a first linear polarizer (24) and a first quarter-wave plate (25) which are sequentially arranged along the propagation direction of light;
the Mueller matrix test receiving system (3) is composed of a second quarter-wave plate (31), a second linear polarizer (32) and a CCD detector (33) which are sequentially arranged along the propagation direction of light;
the environmental interference suppression polarizing system (4) is composed of a second laser (41), a second attenuation plate (42), a third linear polarizer (43) and a third quarter-wave plate (44) which are sequentially arranged along the propagation direction of light;
the environmental interference suppression receiving system (5) comprises a polarization state measuring instrument (51);
opening a first laser (21) in the Mueller matrix test polarization system (2), adjusting the brightness of a first attenuation sheet (22), removing a first quarter-wave plate (25), and adjusting a first linear polarizer (24) to generate horizontal linear polarized light;
step three, turning on a second laser (41) in the environment interference suppression polarizing system (4), adjusting the brightness generated by a second attenuation sheet (42) to be the same as the brightness generated by the first attenuation sheet (22) in the step one, removing a third quarter-wave plate (44), and adjusting a third linear polarizer (43) to generate horizontal linear polarization;
removing a second quarter-wave plate (31) in the Mueller matrix test receiving system (3), adjusting a second linear polarizer (32) to enable the polarization state of the second linear polarizer to be the same as that of the Mueller matrix test polarization system (2) in the step one, and testing a light spot pattern received during horizontal polarization and horizontal polarization detection;
filling a particulate matter sample to be detected into a lower-layer atmospheric particulate matter simulation system (11) of the multilayer environment simulation system (1), and filling water mist with different concentrations into an upper-layer water mist environment simulation system (12) for simulating cloud and mist environments under different weather conditions, wherein the two medium environments are uniform medium environments;
after the medium environment in the multilayer environment simulation system (1) is stable, respectively receiving light spot patterns of two layers of media in the vertical direction by a CCD detector (33) in the Mueller matrix test receiving system (3) and receiving an emergent Stokes vector of an upper-layer water mist interference environment by a polarization state measuring instrument (51) in the environment interference suppression receiving system (5), and recording;
step seven, repeating the step one to the step six, and adjusting a first linear polarizer (24) and a first quarter-wave plate (25) in the Mueller matrix test polarization system (2) to sequentially generate horizontal polarized light, vertical polarized light, linear polarized light with +45 degrees and-45 degrees, and left-handed and right-handed polarized light; adjusting a second quarter-wave plate (31) and a second linear polarizer (32) in the Mueller matrix test receiving system (3), sequentially detecting horizontal polarized light, vertical polarized light, linear polarized light at +45 degrees, -45 degrees, right-handed circularly polarized light and left-handed circularly polarized light, combining thirty-six polarization and polarization detection, and receiving a light intensity pattern by a CCD detector (33);
step eight, adjusting a third linear polarizer (43) and a third quarter-wave plate (44) in the environmental interference suppression polarization system (4) to enable the polarization state generated by the environmental interference suppression polarization system (4) to be the same as the polarization state in the Mueller matrix test polarization system (2), wherein six polarization states are counted, and six groups of Stokes vectors transmitted in the interference environment are received by a polarization state measuring instrument (51) respectively;
and step nine, multiplying the polarization state of the polarization state adjusted in the seven-Mueller matrix test receiving system (3) by the particle Mueller matrix and the six groups of Stokes vectors measured in the step eight, and solving the light intensity pattern received by the thirty-six groups of CCD detectors (33) correspondingly measured in the step seven, so as to obtain sixteen elements in the atmospheric particle Mueller matrix.
2. The ambient interference suppression atmospheric particulate matter mueller matrix measurement method of claim 1, wherein: the atmospheric particulate simulation system (11) and the water mist environment simulation system (12) are the same in length and are arranged in length alignment; the water mist environment simulation system (12) is the same in length and height, vertical optical windows are formed in the vertical direction atmospheric particulate matter simulation system (11) and the water mist environment simulation system (12), the central axes of the vertical optical windows of the atmospheric particulate matter simulation system (11) and the water mist environment simulation system (12) coincide, and a horizontal optical window is formed in the horizontal direction water mist environment simulation system (12).
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| CN115876650A (en) * | 2023-02-27 | 2023-03-31 | 长春理工大学 | Synchronous measurement system and method for Mueller matrix |
| CN115876650B (en) * | 2023-02-27 | 2023-05-30 | 长春理工大学 | Mueller matrix synchronous measurement system and method |
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