Environmental protection is inseparable from the water quality and oil pollution measuring instrument based on spectroscopy technology

[ Focus on Chemical Machinery Equipment Network ] Laser spectroscopy technology is an active optical detection technology.
When laser light is incident on the surface of seawater covered with oil film, the oily substance will be radiated and fluorescence will be stimulated, and the seawater will produce inelastic Raman.
Scattered light, analysis of fluorescence spectrum and Raman scattering spectrum information can realize quantitative measurement of oil film thickness.

At present, two water surface oil film thickness measuring instruments have been developed.
They are portable and remote sensing water quality and oil pollution measuring instruments.
The measuring distance of the portable instrument is within 100 meters and is easily affected by ambient light; the remote sensing measuring distance exceeds 500 meters and is affected by the environment.
Light influence is small, and it can work around the clock.

Laser spectroscopy is a spectroscopy technology that uses laser as the light source.
Compared with ordinary light sources, laser light sources have the characteristics of good monochromaticity, high brightness, strong directivity and strong coherence.
They are used to study the interaction between light and matter, so as to identify the structure, composition, and composition of matter and its system.
Ideal light source for state and its changes.
The appearance of laser has greatly improved the sensitivity and resolution of the original spectroscopy technology.
Since lasers with extremely high intensity and extremely narrow pulse width can be obtained, it is possible to observe multiphoton processes, nonlinear photochemical processes, and relaxation processes after molecules are excited, and they have been developed into new spectroscopy technologies.
Laser spectroscopy has become a research field closely related to physics, chemistry, biology and materials science.  

　　For more than half a century, with the improvement and deepening of human understanding of the nature of light, the tremendous progress of optical technology, especially the invention of lasers and the application of laser technology, the understanding of the interaction between light and matter has been fundamentally improved.
And development.
At the same time, people's understanding of environmental pollution problems has been continuously improved, and modern technical means, especially optical technology, have been used to study some environmental physical and chemical phenomena and processes, and modern environmental spectroscopy has been gradually developed.  

　　Environmental spectroscopy is not only an innovative development of classical optics, but also a new development of environmental science.
Environmental spectroscopy monitoring is an important part of environmental optics.
It uses optical absorption, emission, scattering and atmospheric radiation transmission methods to obtain the characteristics of trace gases through the establishment of characteristic factor fingerprint spectrum databases and quantitative analysis algorithms.
The automatic monitoring of air quality, fixed and mobile pollution sources has the advantages of real-time, dynamic, fast, non-contact remote measurement, remote measurement, wide monitoring range, and low cost.
It is the development direction and leading technology of today's international environmental monitoring.  

　　Using optical absorption spectroscopy, emission spectroscopy, light scattering, and atmospheric radiation transmission methods, Liu Wenqing’s team proposed to carry out innovative research on the intersection of optics and the environment.
At present, it has formed the use of differential optical absorption spectroscopy (DOAS) technology, Fourier Transformation Infrared Spectroscopy (FTIR) Technology, Non-Dispersive Infrared (NDIR) Technology, Tunable Semiconductor Laser Absorption Spectroscopy (TDLAS) Technology, Lidar (LIDAR) Technology, Fluorescence Spectroscopy Technology, Laser Induced Breakdown Spectroscopy (LIBS) Technology, Optical Cavity Environmental optical monitoring technology system based on Cavity Ring-Down Spectroscopy (CRDS), light scattering measurement technology, photoacoustic spectroscopy technology, etc.
, to achieve rapid on-site detection and multi-dimensional detection of environmental trace components/multi-element Multi-platform monitoring has been successfully applied to the monitoring of the atmosphere, water sources and soil.  

　　Source: Hefei Institute of Material Science, Science and Technology Daily, Encyclopedia
 

　　Original title: Environmental protection is inseparable from spectroscopy-based water quality and oil pollution measuring instrument