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Inversion Method of Radiation Characteristic Parameters of Suspension Solution Based on GPU Parallel Acceleration

A technology of suspended solution and radiation characteristics, applied in the measurement of scattering characteristics, etc., can solve the problems of large computer, cost, low accuracy, etc., and achieve the effect of small impact on initial value, high sensitivity, and improved accuracy

Active Publication Date: 2017-03-22
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0007] In order to solve the problem of low accuracy of the measurement results of the radiation characteristic parameters of the suspension solution and the problem of consuming a large amount of computers in the prior art, the present invention proposes a method for inversion of the radiation characteristic parameters of the suspension solution based on GPU parallel acceleration

Method used

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  • Inversion Method of Radiation Characteristic Parameters of Suspension Solution Based on GPU Parallel Acceleration
  • Inversion Method of Radiation Characteristic Parameters of Suspension Solution Based on GPU Parallel Acceleration
  • Inversion Method of Radiation Characteristic Parameters of Suspension Solution Based on GPU Parallel Acceleration

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specific Embodiment approach 1

[0035] Specific implementation mode 1: Combination figure 1 Explain that in this embodiment, the method for inverting the radiation characteristic parameters of the suspended solution based on GPU parallel acceleration is specifically performed according to the following steps:

[0036] Step 1. Prepare the suspension solution to be tested, put the suspension solution to be tested in a sample container made of quartz glass, and mix the suspension solution to be tested evenly during the experimental measurement;

[0037] Step 2. Measure the BSDF of the sample container containing the suspension solution to be tested. The laser light source is incident on the left side of the sample container along a direction perpendicular to the surface of the sample container, and the sample container is measured with a rotatable detector arranged outside the sample container The scattering signals of different scattering directions from the left side to the right side, and the range from the left ...

specific Embodiment approach 2

[0050] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the initial values ​​of the radiation characteristic parameters of the suspension solution are assumed in the third step, including the extinction coefficient β and the scattering coefficient σ. s And the initial value of the asymmetry factor g, and then use the GPU-based MC algorithm to solve the radiation transfer process in the sample container containing the suspension, and obtain a set of BSDF simulation data BSDF in different directions of the light scattering of the sample container sim ; The specific process is:

[0051] The radiation transfer process in the sample container is solved by the radiation transfer equation:

[0052]

[0053]

[0054] In the formula, I(r,s) is the radiation intensity, r is the position vector of the radiation field, s is the direction vector, β′ is the initial value of the extinction coefficient β, Φ(s′→s) is the scattering phase function, Ω′ is Solid angle, σ s...

specific Embodiment approach 3

[0056] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the objective function F(x) in the step three is:

[0057] Combine the following formula:

[0058]

[0059]

[0060] In the formula, τ is the optical thickness, ω is the albedo, g is the asymmetry factor, and the value range of g is [-1,1], N d Is the number of scattering angles used.

[0061] Other steps and parameters are the same as those in the first or second embodiment.

[0062] The following examples are used to verify the beneficial effects of the present invention:

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Abstract

The invention discloses a suspended solution radiation characteristic parameter inversion method based on GPU parallel acceleration, and relates to a suspended solution radiation characteristic parameter method based on GPU parallel acceleration. The suspended solution radiation characteristic parameter inversion method aims to solve the problems that the accuracy rate of measurement results of suspended solution radiation characteristic parameters is low and a great number of computers are needed in the prior art. The suspended solution radiation characteristic parameter inversion method is specifically performed by virtue of the following steps: step 1, preparing a to-be-measured suspended solution, and feeding the to-be-measured suspended solution into a sample container which is made from quartz glass; step 2, measuring BSDF of the sample container filled with the suspended solution to acquire a group of BSDF experimental measurement data BSDFexp in different scattering directions; and step 3, performing inversion on radiation characteristic parameters of the sample container suspended solution based on the combination of a GPU acceleration algorithm and an optimization algorithm, wherein the radiation characteristic parameters of the suspended solution comprise extinction coefficients beta, scattering coefficients sigma s and asymmetry factors g. The suspended solution radiation characteristic parameter inversion method disclosed by the invention can be applied to the technical field of optical characteristic measurement of the suspended solutions.

Description

Technical field [0001] The invention relates to a method for GPU parallel acceleration of radiation characteristic parameters of a suspension solution. Background technique [0002] In the past, CPU-based single-threaded MC simulation calculations required a large number of computers. Since NVIDIA proposed a heterogeneous (CUDA) parallel computing architecture in 2006, the programming language using graphics card (GPU) parallel computing has been greatly improved. At the same time, the performance of the graphics card is continuously improved, which greatly reduces the simulation time of the MC method to solve the radiation transfer equation. This is the use of the MC method combined with optimization algorithms (such as particle swarm optimization algorithm PSO, genetic algorithm GA) The foundation was laid for inversion. [0003] Generally speaking, there are two methods for measuring the radiation characteristic parameters of the suspended particle solution: [0004] The method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/51
Inventor 赵军明马春阳裘俊刘林华
Owner HARBIN INST OF TECH
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