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Adding a new magnifying glass technology to the spectrum to help nitrogen dioxide detection

 Last Update: 2022-04-30
 Source: Internet
 Author: User

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[ Hot Focus on Chemical Machinery and Equipment Network ] Simply put, in the existing development concept, the environment is regarded as a basis for social development, and economic development should be based on environmental protection, and insist on protecting and developing during development.
In order to achieve long-term and sustainable social and stable development
.

Chemical machinery and equipment network hotspots focus on chemical machinery and equipment

In environmental protection, atmospheric protection occupies a very important position
.
For a long time in the past, atmospheric pollutants have been a problem that plagued our lives.
Even today, this problem has not been completely solved.
The greenhouse effect is caused by air pollution
.
But what we want to mention today is not the greenhouse effect, nor carbon dioxide, but another polluting gas - nitrogen dioxide
.

Nitrogen dioxide mainly comes from the combustion of fossil fuels in the industrial production process, the combustion of straw or other biomass in agricultural production, the exhaust gas emissions from transportation, and natural phenomena (such as lightning or photochemical reactions in the stratosphere).
one of the common pollutants
.
Among them, the amount of nitrogen dioxide caused by natural phenomena is very limited, so from the perspective of pollution, the source of nitrogen dioxide pollution is still concentrated in human activities
.

Of course, because nitrogen dioxide has always been highly valued as an air pollutant, in fact, there has been a very complete set of methods for its detection
.
This method is the spectrum
.
Simply put, different gases in the atmosphere have their own special spectra, so by spectral measurement of the sample gas, the content of different gas components can be accurately analyzed, and the proportion of polluting gases in the environment can be calculated from this
.
The spectrum itself is a general laboratory analytical instrument , so it should be very mature in terms of the prevention and control of atmospheric nitrogen dioxide pollution
.
But even so, there are still problems
.

Analytical Instruments

　　In fact, when the concentration of nitrogen dioxide in the atmosphere is low to a certain level, there may be situations where the instrument cannot measure accurately but the pollution cannot be ignored, and this situation is very common in some special application scenarios, such as plateaus and surrounding oceans environment,
etc.
Therefore, it is very important to improve the spectral sensitivity and the detection rate of nitrogen dioxide
.

　　And just recently, a new achievement managed to do just that
.
The research team of Zhang Weijun, Anhui Institute of Optics and Mechanics, Hefei Institute of Physical Science, Chinese Academy of Sciences, successfully realized the rapid and sensitive detection of nitrogen dioxide in the atmospheric environment by using the amplitude modulation cavity-enhanced absorption spectroscopy technology of phase-sensitive detection
.

　　It is understood that this technology uses a "broadband multi-mode diode laser" in the instrument.
This component can output a wavelength with a certain width, and can generate two or more longitudinal modes at the same time.
Using it as the detection light source of the instrument is like giving With a special "magnifying glass" attached to the spectrum, even nitrogen dioxide concentrations above the detection limit can be measured
.

　　It is worth mentioning that the product has been tested in different occasions, but many problems are still waiting to be solved, such as how to further reduce the size, simplify and standardize the operation, etc.
, but it can be expected that with the product Towards the continuous anti-war of intelligence and portability, it is likely to become a favorable tool for atmospheric environment monitoring in the future, and it will play a role in the detection of nitrogen dioxide concentration
.

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