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Method for calibrating combined type aerosol diluter

A calibration method, aerosol generator technology, applied in the direction of instruments, scientific instruments, test samples, etc., can solve the problems of ignoring the characteristics of aerosol particles, and the inability to really measure the change value of particle concentration, so as to improve the measurement The effect of precision

Pending Publication Date: 2019-09-17
FUJIAN METROLOGY INST
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Problems solved by technology

[0011] Just measuring the flow rate of the original particle counter and the flow rate of the supplementary clean compressed gas, and then calculating the dilution ratio, it is impossible to really measure the change value of the particle concentration in the diluter, ignoring the material characteristics of the aerosol particles, that is, the aerosol Whether there are factors such as aggregation and adhesion of particles in the diluter

Method used

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  • Method for calibrating combined type aerosol diluter
  • Method for calibrating combined type aerosol diluter
  • Method for calibrating combined type aerosol diluter

Examples

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Embodiment 1

[0038] First prepare the monodisperse polystyrene (PSL) particle standard solution of two kinds of different concentrations, the volume of solution is 100mL, 1# sample is the diluent of high concentration polystyrene and pure water that particle diameter is 0.5 μm, 2 The concentration of the polystyrene solution prepared by #sample is f times that of 1#, that is, the dilution factor of the diluter, as shown in Table 1.

[0039] Table 1. Standard substances for the required concentration ratios for calibration

[0040]

[0041] *The concentration ratio of monodisperse particle dilution can also be prepared separately according to the actual measurement point.

[0042] The preparation method of monodisperse particle dilution is as follows:

[0043] (1) Drop 100uL of high-concentration polystyrene stock solution directly into a clean volumetric flask to avoid stock solution contamination.

[0044] (2) Prepare 1# sample, pour pure water into the volumetric flask, close the volu...

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Abstract

The invention belongs to the field of nano-particle metering, and especially relates to a method for calibrating a combined type aerosol diluter. The method is characterized by measuring a particle concentration value before and after an aerosol diluter is used through a calibrated particle counter, calculating a dilution ratio of a diluter, and comparing the dilution ratio with a nominal value to complete calibration of the diluter. A calibrating system comprises an aerosol generator, a uniform mixer, and a standard particle counter. According to the method of the invention, a scientific and reasonable calibration method is adopted to ensure an accurate and reliable measured result; the method is capable of effectively calibrating the combined type aerosol diluter and improving measuring precision of analysis instruments such as the particle counter, thereby providing technical support for establishment of a traceability system of particle number concentration.

Description

technical field [0001] The invention belongs to the field of nanometer particle measurement, in particular to a calibration method for a confluent aerosol diluter. Background technique [0002] When the measuring instrument is performing particle size analysis, too high a concentration will cause collisions between particles, agglomeration and coagulation, etc., which will affect the accuracy of the measurement results. The main function of the aerosol diluter is to reduce the concentration of the aerosol by diluting the aerosol, so as to solve the problem that the high concentration cannot be tested or the flow rate does not match during the particle analysis. [0003] For example, in the field of nanoparticle counting, since the traceability system of particle number concentration in the low concentration range has not yet been established, it is necessary to accurately dilute high-concentration samples with good traceability to obtain low-concentration samples with known ...

Claims

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Application Information

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IPC IPC(8): G01N1/38G01N15/10
CPCG01N1/38G01N15/10G01N2001/387G01N2015/1024
Inventor 黄志煌刘俊杰李杰董旭林军林国辉
Owner FUJIAN METROLOGY INST
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