Monochrome laser induced incandescent light nano-grade soot grain diameter measurement device and method

A technology of laser induction and measurement device, which is applied in the direction of measurement device, particle size analysis, particle and sedimentation analysis, etc. It can solve the problems of low accuracy rate, slow cooling speed, and difficult operation of incandescent light, so as to achieve small relative error and avoid time-consuming and laborious Effect

Active Publication Date: 2018-05-01
ZHEJIANG UNIV
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Problems solved by technology

However, the two-color laser-induced incandescence system requires simultaneous detection and strict calibration under experimental conditions, and because the cooling rate of large particles is slower than that of small particles, the measured temperature of polydisperse particles can usually only be regarded as an effective value of the particle temperature and cannot be accurately Reflect the temperature of each particle, so the two-color laser induced incandescent light operation is difficult and the accuracy is low

Method used

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  • Monochrome laser induced incandescent light nano-grade soot grain diameter measurement device and method
  • Monochrome laser induced incandescent light nano-grade soot grain diameter measurement device and method
  • Monochrome laser induced incandescent light nano-grade soot grain diameter measurement device and method

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Embodiment 1

[0043] In the prior art, the two-color laser-induced incandescent light experiment is carried out on a typical Santoro flame, and the particle size is calculated by the following formula

[0044]

[0045] Among them, τ T Indicates the temperature decay time, T g Indicates the temperature of the surrounding gas, the shielding effect parameter of the aggregate and the composition coefficient C of the thermodynamic parameters of the particles and the surrounding gas, that is

[0046]

[0047] Among them, α T Indicates the thermal regulation coefficient, p g Indicates the pressure of the gas around the soot particles, N p Indicates the number of primitive body particles in the aggregate, ρ s is the density of soot, c s is the specific heat of soot, R is the universal gas constant, W g is the average molar mass of the gas around the soot particle, γ is the specific heat ratio of the surrounding gas, k h and D h Both are scaling factors for soot particles.

[0048] Un...

Embodiment 2

[0066] This embodiment is also implemented based on the monochromatic laser-induced incandescent light nanoscale soot particle size measurement device in embodiment 1, and the similarities will not be repeated. The measurement device of this embodiment also includes a lens for TEM sampling of soot particles Electron microscope, through the transmission electron microscope TEM sampling to observe the soot particle size D p , the obtained electron microscopy results are as follows Figure 7 shown. When the computer program in the memory of this embodiment is executed by the processor, it can realize Figure 4 Steps shown:

[0067] Obtain signal characteristic time step S1, obtain the time required for the incandescent light signal intensity of soot particles to decrease to its peak value 1 / e, which is the signal characteristic time τ λ , measuring the characteristic time τ of the laser-induced incandescent light signal in the flame λ ;

[0068] Modeling step S2, establishin...

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Abstract

The invention discloses a monochrome laser induced incandescent light nano-grade soot grain diameter measurement device and method and belongs to a grain diameter measurement technology of soot particles. The measurement device comprises a flame generation unit, a laser device for heating the soot particles of flame, a capturing unit for capturing an incandescent light signal in the flame, an oscilloscope for displaying and recording a relationship between the captured incandescent light signal and time, and a processing unit which is in communication connection with the oscilloscope, whereinthe processing unit comprises a storage device and a processor; the storage device is used for storing a computer program; when the computer program is executed by the processor, the following steps can be realized: defining time needed for reducing the strength of the laser induced incandescent light signal of the soot particles to 1/e of a peak value as signal characteristic time; obtaining thegrain diameter of the soot particles in the flame based on a grain diameter calculation model comprising a relationship between the grain diameter of soot and the signal characteristic time; obtaininga more accurate grain diameter value by utilizing a method for calibrating physical parameters, so as to conveniently and rapidly obtain two-dimensional grain diameter distribution of the soot.

Description

technical field [0001] The invention relates to the particle size measurement technology of soot particles, in particular to a monochromatic laser-induced incandescent light nanoscale soot particle size measurement device and method. Background technique [0002] In recent years, the harm of particles in the atmosphere has been widely concerned by people, and the harm of soot to the human body has a great relationship with the particle size. The smaller the particle size of soot, the greater the proportion of stagnant particles entering the human lungs. The harm to the human body is also greater, so it is more practical to study the particle size measurement of nano-scale soot. The laser-induced incandescent light technology has high time and space resolution, and it is a promising technology for soot testing. [0003] The current laser-induced incandescent technology is usually a two-color laser-induced technology, and it is necessary to establish a two-color laser-induced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
CPCG01N15/0205
Inventor 陈玲红吴学成岑可法吴建韩黎霞
Owner ZHEJIANG UNIV
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