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SPAMS actual measurement-based non-linear inversion method of optical parameters of uniform spherical particles of aerosol based on

A technology of spherical particles and optical parameters, applied in the field of atmospheric environmental science, can solve problems such as difficult convergence, lower analysis efficiency and parameter accuracy, and high dependence on initial values, and achieve the effect of improving efficiency and parameter accuracy

Inactive Publication Date: 2015-01-07
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this simple algorithm is a linear algorithm, which has a high degree of dependence on the initial value, and it is easy to cause the inversion calculation process to be difficult to converge or fall into the local extreme value due to the inaccurate initial value of the given calculation, which reduces the analysis work efficiency and Parameter accuracy
At the same time, this algorithm is mainly aimed at ATOFMS, not applicable to SPAMS (because the geometric parameters of SPAMS are different from those of ATOFMS)
[0008] At present, there is no report on the inversion of relevant parameters based on the measurement of atmospheric aerosol particles measured by SPAMS

Method used

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  • SPAMS actual measurement-based non-linear inversion method of optical parameters of uniform spherical particles of aerosol based on
  • SPAMS actual measurement-based non-linear inversion method of optical parameters of uniform spherical particles of aerosol based on
  • SPAMS actual measurement-based non-linear inversion method of optical parameters of uniform spherical particles of aerosol based on

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Embodiment 1

[0079] This embodiment introduces the calculation process of the single particle light scattering theory of the SPAMS of the present invention.

[0080] According to the optical scattering properties of the atmosphere, the present invention uses the Mie scattering theory and combines the geometric parameters of the SPAMS ellipsoid mirror to analyze the single particle optical scattering process in the mass spectrometer, thereby establishing the corresponding theoretical calculation formula and numerical calculation method, and designing and A corresponding fast calculation program is written.

[0081] Assuming linearly polarized incident radiation, the optical scattering response of SPAMS is:

[0082] R SPAMS =R AS -R OA (1)

[0083] Since SPAMS cannot observe all ranges of scattering, it is necessary to calculate the optical scattering response of SPAMS according to the effective angle range of the SPAMS beam collection mirror. This integral calculation process can be ...

Embodiment 2

[0106] This embodiment introduces the process of obtaining the linear relationship between measured scattering data and theoretical scattering data through linear fitting in the present invention.

[0107] In order to compare the theoretical optical scattering response of SPAMS with the field measured response, it is necessary to derive the relationship function between the measured and theoretical optical scattering data. Since photomultiplier tubes operate in the linear range and A / D converters are quantized, R means The pulse range and theoretical response show a linear relationship. Therefore, R can be obtained from the linear fit of the measured pulse and the theoretical response means converted to R SPAMS,means as a function of , for direct comparison with the theoretical response. Among them, the linear relationship expression between the measured scattering data obtained by linear fitting and the theoretical scattering data is:

[0108] R SPAMS,means = R means G+...

Embodiment 3

[0111] This example introduces the relationship between the optical physical properties of the particles and the particle size and chemical composition.

[0112] The present invention utilizes the extended single particle aerosol mass spectrometer to perform laboratory simulation and field observation to obtain theoretical and measured data respectively, and then compare and analyze the optical property data of single particle, so as to obtain the optical physical properties and particle size and chemical composition relationship.

[0113] All measured and collected samples are calibrated using the above calibration method, the impulse response is converted into a scattering cross section, and then fitted with the theoretical response.

[0114] The parameter inversion fitting process is to use the nonlinear optimization method to obtain the minimum value of the error function SqErr. Among them, the expression of the objective function SqErr is:

[0115] SqErr ...

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Abstract

The invention discloses a SPAMS actual measurement-based non-linear inversion method of optical parameters of uniform spherical particles of aerosol. The non-linear inversion method comprises the following steps: detecting PSL balls with different particle diameters and known optical property parameters by adopting an SPAMS, and obtaining the scattering intensity of the actually-measured PSL balls by averaging; simultaneously, combining geometrical parameters of an ellipsoidal reflector of the SPAMS and a single-particle uniform spherical model according to a Mie scattering theory to obtain the optical scattering theory response of the PSL balls; carrying out the linear combination on the optical scattering theory response and the scattering intensity obtained by the actual measurement so as to obtain a linear relation of actually-measured scattering data and theory scattering data; applying the obtained linear relation in atmospherical single-particle scattering data in the SPAMS actual measurement, so as to obtain corresponding the Mie theory scattering intensity; and carrying out the non-linear inversion fitting on the Mie theory scattering intensity so as to obtain the optical property parameters. The non-linear inversion method disclosed by the invention is high in efficiency and accurate, is applied in the SPAMS, and can be widely applied in the field of the atmospheric environment science.

Description

technical field [0001] The invention relates to the field of atmospheric environment science, in particular to a nonlinear inversion method for optical parameters of aerosol uniform spherical particles measured by SPAMS. Background technique [0002] Glossary: [0003] SPAMS: Single Particle Aerosol Mass Spectrometer. [0004] Mie scattering: When the diameter of the particle is close to the wavelength of light, the scattering of light by the particle is called Mie scattering. The Mie scattering theory is a classic algorithm for solving the analytical solution of the interaction between a spherical scatterer and an electromagnetic wave field. [0005] PSL: polystyrene latex, polystyrene latex standard pellets. [0006] The study of aerosols has always been a frontier field in atmospheric environmental science, and plays an important role in many geophysical and geochemical global changes, and its research has become one of the hotspots in atmospheric science and even earth...

Claims

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Application Information

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IPC IPC(8): G01N15/02G01N15/10
Inventor 邱宁毕新慧张国华
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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