Novel method for simultaneously measuring absorption coefficient of aerosol at multiple wavelengths through single photoacoustic cell

An absorption coefficient, photoacoustic cell technology, applied in the optical field, can solve the problems of aerosol particle loss, space-time inhomogeneity, complex system structure and operation, etc.

Inactive Publication Date: 2016-11-16
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0011] The present invention is mainly used to solve the complex problem of system structure and operation caused by multiple photoacoustic cells when measuring aerosol multi-wavelength absorption, and provides a method for online measurement of wavelength-dependent characteristics of atmospheric aerosols using a si

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  • Novel method for simultaneously measuring absorption coefficient of aerosol at multiple wavelengths through single photoacoustic cell
  • Novel method for simultaneously measuring absorption coefficient of aerosol at multiple wavelengths through single photoacoustic cell
  • Novel method for simultaneously measuring absorption coefficient of aerosol at multiple wavelengths through single photoacoustic cell

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Embodiment Construction

[0038] Such as figure 1 As shown, the new method for simultaneously measuring the multi-wavelength absorption coefficient of aerosol with a single photoacoustic cell is characterized in that: the signal function generator 9 is used to generate square wave signals with a frequency interval of df, and these square wave signals are used to control multiple fiber lasers 1 -3 performing power amplitude modulation to generate laser signals of different frequencies, these laser signals of different frequencies are transformed into corresponding output lasers of different wavelengths by corresponding multiple fiber lasers, and the output lasers of different wavelengths are combined by the fiber combiner 4, The optical fiber adjustment bracket 5 adjusts the optical path and then enters the photoacoustic cell 6 vertically, and ensures that the optical axis coincides with the axis of the photoacoustic cell. The photoacoustic cell 6 is provided with a sample inlet and a sample outlet. The...

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Abstract

The invention discloses a method for simultaneously measuring an absorption coefficient of an aerosol at multiple wavelengths through a single photoacoustic cell. The method comprises the steps that amplitude modulation is conducted on multiple laser devices with different wavelengths through square signals which are generated by a function generator at the frequency intervals of df, lasers with different wavelengths are emitted into the photoacoustic cell after being subjected to beam combination through a fiber optic combiner, the lasers emitted into the photoacoustic cell interact with the aerosol in the photoacoustic cell, and a photoacoustic signal P<m>(f0+/-f) reflecting an absorption signal of aerosol particles is generated; the absorption coefficient of the aerosol at the multiple wavelengths is obtained through calculation according to a deduced absorption coefficient formula at different modulation frequencies. The method solves the problems of spatial and temporal heterogeneity of samples and particle losses caused by measurement conducted through multiple photoacoustic cells, the measuring process is simpler, and the system structure is more compact. By means of the method, the aerosol absorption Angstrom coefficient can be obtained, components of the aerosol can be recognized, and therefore a valuable decision making basis is provided for traceability and governance of haze.

Description

technical field [0001] The method belongs to the field of optics. The invention relates to a new method for simultaneously measuring the optical absorption coefficient of aerosol at multiple wavelengths with a single photoacoustic cell. The method uses photoacoustic spectroscopy combined with a Fourier transform data processing method to realize the wavelength dependence of the aerosol optical absorption coefficient. Real-time online measurement of properties. Background technique [0002] With the rapid growth of my country's economy, industrial production, urban traffic and other production and living activities have become more and more serious pollution to the atmospheric environment, and large-scale, long-term smog weather has become more frequent, which is harmful to the healthy development of the national economy and the people. Therefore, it is particularly urgent to trace the source of smog and carry out targeted governance on this basis. Atmospheric aerosol is one...

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Application Information

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IPC IPC(8): G01N21/17
CPCG01N21/1702G01N2021/1704
Inventor 刘强都小凡朱文越黄印博李学彬曹振松邵士勇
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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