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A new weapon in the field of terahertz technology environmental monitoring

 Last Update: 2022-02-03
 Source: Internet
 Author: User

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[ Focus on Chemical Machinery Equipment Network ] Environmental monitoring is the foundation and key of environmental governance and protection.
Since the rapid development of industry in the last century led to many serious pollution incidents, environmental monitoring technology has begun to develop rapidly.
So far, not only in terms of monitoring methods, an environmental monitoring quality control system composed of physical and chemical analysis technology, biological monitoring technology, "3S" monitoring technology, information technology and other technologies has been formed, but also in the diversity of monitoring indicators and monitoring data.
There have also been great improvements in precision and accuracy.

Chemical machinery and equipment network hotspots pay attention to chemical machinery and equipment

Recently, Professor Zhu Weidong, a member of the online analytical instrument expert group of the Analytical Instrument Society, explained the application of these two technologies in environmental monitoring and other fields.

Analytical Instruments

Hyperspectral technology is no stranger to us.
As a telemetry imaging analysis technology with extremely high spectral resolution and continuous bands, hyperspectral technology integrates sample image information and spectral information.
It can not only reflect the external quality characteristics such as sample size, shape, and defects, but also fully reflect the internal characteristics of the sample.
Information such as differences in physical structure and chemical composition has become a common technique for airborne and spaceborne telemetry.

In environmental monitoring, hyperspectral technology has been widely used in the monitoring of pollutant gases and greenhouse gases in the atmospheric environment, monitoring of water blooms, water quality, and safety of drinking water sources in key water pollution sources in the water environment, and monitoring of biodiversity and vegetation types in the ecological environment.
, Soil pollution and other fields.
With the development of unmanned aerial vehicle technology, hyperspectral analysis technology is equipped with unmanned aerial vehicles, and there has been a further development in real-time environmental monitoring and unmanned monitoring.

　　Compared with hyperspectral technology, terahertz technology is still in the development stage, the technology is still immature, and it cannot be applied in a wide range.
Therefore, terahertz technology is one of the key directions of current detection technology development.

　　The terahertz (THz, 1THz = 1012 Hz) band refers to the electromagnetic spectrum region with a frequency from 100 GHz to 10 THz and a corresponding wavelength from 3 millimeters to 30 microns, which is between millimeter wave and infrared light.
Terahertz waves have high frequency, short pulses, strong penetrability, and low energy.
They have less damage to substances and human bodies, and have broader application prospects than X-rays.

　　Terahertz technology can be divided into terahertz spectroscopy technology and terahertz imaging technology, and terahertz spectroscopy technology can be divided into terahertz time domain spectroscopy technology and terahertz frequency domain spectroscopy technology.
Among them, terahertz time domain spectroscopy (THz-TDS) has unique advantages in detecting and identifying gases.
The basic principle of terahertz time-domain spectroscopy technology is to use femtosecond pulses to generate and detect time-resolved terahertz electric fields, and obtain spectral information of the measured object through Fourier transform, which can simultaneously determine the absorption and chemical composition of different components in the mixed gas And concentration.
By comparing the spectrum before and after the terahertz wave passes through the gas sample, the characteristic spectrum of the gas can be obtained, and then the gas can be monitored and identified, which is a good supplement to the current mid-infrared spectrum analysis technology.

　　Terahertz spectroscopy technology is sensitive to some trace polar molecules.
The main components of gaseous pollutants in ambient air are some polar gases such as SO2 and NOX.
Using this feature, terahertz spectroscopy technology can effectively monitor these pollutants, and has great application prospects and development space in gas monitoring.

　　The study of terahertz band spectroscopy has just started, and it is still in a period of rapid development.
It is foreseeable that terahertz time-domain spectroscopy technology will become one of the important means of environmental monitoring, and miniaturized, portable, high-resolution real-time terahertz time-domain spectroscopy detection systems will be the development trend.

　　Original title: A new weapon in the field of terahertz technology environmental monitoring

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