Device and method for measuring extinction coefficient of black carbon aerosol

A technology of extinction coefficient and measuring device, which is applied in the direction of transmittance measurement, etc., can solve the problems of weakening aerosol cooling effect, measurement uncertainty or error, radiation forcing, etc., and achieve the effect of real-time measurement of extinction coefficient

Inactive Publication Date: 2011-11-23
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

The 2000 IPCC (Intergovernmental Panel on Climate Change, United Nations Intergovernmental Panel on Climate Change) report pointed out that black carbon aerosols can lead to positive radiative forcing, thereby greatly weakening

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  • Device and method for measuring extinction coefficient of black carbon aerosol
  • Device and method for measuring extinction coefficient of black carbon aerosol
  • Device and method for measuring extinction coefficient of black carbon aerosol

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Embodiment Construction

[0026] Such as figure 1 , figure 2 , image 3 with Figure 4 As shown, the atmospheric aerosol extinction coefficient measuring device of the present invention includes an emitting part, a sampling part and a detecting part. The emitting part includes a laser driving power supply 1, a semiconductor laser 2, a beam splitting prism 3 and a rectangular prism 4. The laser driving power supply 1 is equipped with a laser temperature control circuit, an optical power modulation circuit and an optical power stabilization circuit to ensure that the wavelength and power of the laser emitted by the laser do not vary with the environment. Changes and changes, and effectively suppress the impact of environmental light changes on the measurement, the semiconductor laser 2 is connected to the laser drive power supply 1, and emits light pulses of a certain frequency.

[0027] The sampling part includes a measuring pool 6 and a reference pool 14. The structure, geometric scale and materia...

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Abstract

The invention provides a device and method for measuring the extinction coefficient of black carbon aerosol. The device is a two-channel transmission-type atmospheric aerosol measuring device which has high long term reliability and can accurately measure the extinction coefficient of the atmospheric aerosol. The method is characterized by adopting the two-channel photoelectric detection technology and using the ratio of the transmissivity of the filtered gas to the transmissivity of the unfiltered aerosol gas to be detected to show the extinction coefficient of the aerosol and has the advantage of accurate measuring result. The method comprises the following steps: a laser diode (LD) is adopted to transmit a light pulse sequence, the light pulse sequence becomes parallel light after being collimated and is sent out and the light beam is split into two light beams with approximately equal strength with a beam splitter; after respectively passing through a measurement cell channel and a reference cell channel, the two light beams are respectively received by receiving units; the signal received by each channel is processed by a photoelectric signal processing unit and then is sent to a computer control unit by a data acquisition unit; and the computer control unit is used for computing the ratio of the light power detected by the two channels and carrying out logarithmic operation to obtain the extinction coefficient of the aerosol.

Description

technical field [0001] The invention designs a light radiation receiving and measuring device, in particular a transmission type atmospheric environment pollution measuring device, which belongs to the measuring device of extinction coefficient when light radiation energy propagates in the atmosphere. Background technique [0002] The pollution sources in the atmosphere are mainly aerosols and toxic gases. Black carbon aerosol is an important part of atmospheric aerosol, which is mainly produced by the incomplete combustion of carbon-rich substances, such as natural phenomena such as volcanic eruptions and forest fires, and the large-scale use of fossil fuels such as coal and oil by humans. Increase in black carbon aerosol emissions. Because black carbon aerosols have a strong absorption effect on solar radiation in the wavelength range from visible light to infrared, they have an important impact on regional and global climate. The 2000 IPCC (Intergovernmental Panel on Cl...

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Application Information

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IPC IPC(8): G01N21/59
Inventor 肖韶荣朱润赵静
Owner NANJING UNIV OF INFORMATION SCI & TECH
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