Detection and identification of hydrogen isotopes and their oxides is a key point in emission monitoring of nuclear facilities. Therefore, the establishment of an accurate and stable identification system for hydrogen isotopes and their oxides has important application value in the management of nuclear facilities. Raman spectroscopy is a non-contact and non-destructive component analysis method. This method is based on inelastic scattering of photons generated in the interaction between laser and matter, and can generate different characteristic signal peaks according to the structure of molecular bonds. Therefore, different hydrogen isotopes and their oxides can be qualitatively analyzed by Raman characteristic peaks, and a certain degree of quantitative results can be obtained by signal intensity and spectral peak information. Based on the self-built dual-wavelength laser Raman spectroscopy system (532 nm and 785 nm), the vibration spectra of D-O chemical bonds in heavy water (D2O) were detected and compared, which provided data support for further analysis and identification of nuclear facility emissions.
Raman spectroscopy technology is a spectral analysis technology based on Raman effect. With this technology, the molecular structure information can be identified and analyzed quickly, nondestructively and effectively, and it has high spectral specificity. Raman spectroscopy technology can provide the mineral components information of lunar soil samples, which is of great significance for lunar surface exploration and future resource utilization. In this paper, a 785nm Raman spectroscopy detection system was set up, and used to detect and identify phosphate components with different doping concentrations in various types of earth soils, which provided data support for further analysis of lunar samples.
With the deepening of globalization, security inspection has gradually become a necessary means in many occasions. Therefore, rapid and accurate identification of components in the opaque shielding material, without destroying the outer packaging, has become a necessary detection method. Spatially offset Raman spectroscopy (SORS) , as a new Raman spectroscopy technology, can meet such demands. In this paper, the SORS of NaNO3 aqueous solution contained in opaque PTFE vessel has been obtained, using a self-built SORS detection system. In addition, some important parameters such as offset distance and detection concentration has been also studied experimentally.
Defense and security applications often require definitive and non-destructive testing or identification of samples to enable testers to make effective decisions and preserve potential evidence. Raman spectroscopy has consistently demonstrated its effectiveness as an analytical technique in defense research and applications without interfering with sample integrity. Aiming at the fact that Raman spectroscopy is limited to detect sample composition within the near surface layer or transparent medium, Rutherford Appleton Laboratory proposed the spatial offset Raman spectroscopy. This technique can effectively suppress the powerful Raman and fluorescent signal interference from the surface substance, and realize the composition detection under the opaque diffuse scattering medium material of a few mm or cm. In this paper, we have detected and analyzed the spatially offset Raman spectroscopy of sodium nitrate, sodium sulphate and their mixture powder.
As a new type of conventional Raman spectroscopy(CRS) technology, spatially offset Raman spectroscopy(SORS) can acquire subsurface information of the multi-layered materials and realize the detection of concealed materials in nonmetallic opaque and translucent containers. In this paper, the spectrum of NaNO3 powder in a red opaque plastic bottle and a brown translucent glass bottle were detected with a 785nm SORS detection system. According to comparison and analysis, the Raman signal and fluorescence of the surface opaque HDPE container and the surface translucent glass container were suppressed by SORS. The subsurface concealed NaNO3 Raman spectrum peak was detected successfully.
As a new Raman spectroscopy technology, Spatially Offset Raman Spectroscopy (SORS) can realize the detection of bilayer-and even multilayer-compositions nondestructively and non-invasively, providing the possibility of vivo biological diagnosis. In this paper, the detection of CO32- and PO43- covered by PTFE was realized, which are the main mineral components of bone tissues.
In order to further improve the supervision of food safety, the research of rapid inspection technology for food additives with package, which can identify the ingredients of additives quickly and accurately without destroying, has become an urgent need for social development. Spatially offset Raman spectroscopy (SORS), as a derivative of new Raman spectroscopy technology, can further suppress Raman scattering and fluorescence of surface samples, and solve the problem of subsurface sample detection. SORS mainly utilizes the lateral scattering of photons generated by excitation light in multi-layered samples. By controlling the spatial offset (▵S) between the collection point and the incident point, it can realize rapid, accurate and non-destructive detection of the food additives covered by the opaque/semi-transparent medium. This work established an optical detection system based on SORS technology. Sodium nitrite and sodium benzoate samples were placed in PTFE containers instead of packaging, and the best spectral intensities were obtained by changing the offset distance ▵S. Compared with conventional Raman spectroscopy (CRS), the relative intensity of SORS spectra is significantly increased, and the spectra of food additives can be distinguished efficiently.
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