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Method and device for measuring particle size of soot particle

A smoke particle and particle size technology, which is applied in the direction of measuring devices, particle and sedimentation analysis, particle size analysis, etc., can solve the problems that the particle size distribution of the smoke particle group cannot be obtained, and all properties of the scattered light signal are not fully utilized. Effectively Measured Effects

Inactive Publication Date: 2012-06-20
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0004] The disadvantage of the method for measuring the particle size of smoke particles in the above-mentioned prior art is that this method only uses the scattered light intensity of the scattered light signal or the angle distribution measurement data of the degree of polarization for inversion, and does not fully utilize the scattered light signal. All properties, for the smoke particle group with complex structure, the particle size distribution results that conform to the actual situation cannot be obtained

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  • Method and device for measuring particle size of soot particle
  • Method and device for measuring particle size of soot particle
  • Method and device for measuring particle size of soot particle

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Embodiment 1

[0022] A schematic diagram of the principle of a method for measuring the particle size of smoke particles provided by this embodiment is as follows figure 1 As shown, the smoke is sprayed from the nozzle through the pipe from the generating device, the modulated incident light is scattered by the smoke particles, and the photomultiplier tube receives the scattered light at different angles with the rotation of the rotating arm. The scattered light signal is collected and stored in the computer through a lock-in amplifier and a filter. Carry out the calculation and processing of the particle size of the smoke particles in the computer, the specific processing flow is as follows: figure 2 As shown, the following processing steps are included:

[0023] Step 21: Establish a Mueller (Miller) scattering matrix of the scattered light of the smoke particle according to the DC component and the harmonic component of the scattered light of the smoke particle.

[0024] The laser ligh...

Embodiment 2

[0067] This embodiment provides a device for measuring the particle size of smoke particles, which can be set in figure 1 In the computer shown, its specific implementation structure is as follows Figure 4 As shown, it may specifically include:

[0068] The scattering matrix establishment module 41 is used to establish the scattering matrix of the scattered light of the smoke particles according to the DC component and the harmonic component of the scattered light of the smoke particles;

[0069] An objective function establishing module 42, configured to establish an objective function of the particle size parameter of smoke particles according to the scattering matrix established by the scattering matrix establishing module;

[0070] The smoke particle size distribution calculation module 43 is used to obtain the optimal value of the objective function by using the scattering matrix established by the scattering matrix establishment module and the objective function establis...

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Abstract

The embodiment of the invention provides a method and a device for measuring the particle size of soot particles. The method mainly comprises: building a scattering matrix of the scattered light of the soot particles according to the direct current component and harmonic wave component of the scattered light of the soot particle; and constructing a target function of the particle size parameter of the soot particles according to the scattering matrix, working out the optimal value of the target function by using the scattering matrix and the target function and by an inversion algorithm, and obtaining the particle size distribution of the soot particles according to the optimal value. According to the embodiment of the invention, the particle size inversion under a spherical model of the light scattering of soot particles in a fire disaster and the like by starting from a Mueller matrix which completely reflects the light scattering character of the particles, and thus, the particle size distribution of soot particles in a dire disaster and the like can be measured effectively.

Description

technical field [0001] The invention relates to the technical field of electronic applications, in particular to a method and device for measuring the particle diameter of smoke particles. Background technique [0002] Fire detection is an important means to prevent fires. When a fire occurs, a large number of smoke particles are generally released. Therefore, early fire detection can be realized through the perception and identification of smoke. Particle size is an important physical parameter of fire smoke particles. In-depth study of the particle size characteristics of fire smoke particles has important theoretical significance and practical value for the development of photoelectric smoke detection technology and the reduction of false alarm rate of photoelectric smoke detectors. [0003] A method for measuring the particle size of smoke particles in the prior art is an angular scattering method based on the optical Mie scattering theory. In the process of particles s...

Claims

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Application Information

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IPC IPC(8): G01N15/02
Inventor 张永明李耀东方俊王进军
Owner UNIV OF SCI & TECH OF CHINA
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