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.
Spatially Offset Raman Spectroscopy (SORS) is a new type of Raman Spectroscopy technology, which can detect the medium concealed in the opaque or sub-transparent material fast and nondestructively. The article summarized Spatially Offset Raman Spectroscopy`s international and domestic study and application progress on contraband detecting, medical science (bone ingredient, cancer diagnose etc.), agricultural products, historical relic identification etc. and stated the technology would become an effective measurement which had wide application prospect.
A single-shot transient-grating frequency-resolved optical gating (TG-FROG) device was set up to measure UV ultrashort pulse laser with pulse duration within 10ps.The performance of the device was demonstrated by experimental data measured on discharge-pumped KrF laser which is operated in 10Hz repeated frequency mode,and on electronbeam- pumped KrF laser which is only operated in single-shot mode.For the former,the TG-FROG can distinguish the changes of the pulse shape,spectrum and phase when the pulse chirp is changed.For the later,the TG-FROG finds that the pulse shape has multiple peaks whose pulse duration is about 2ps,and the spectrum is modulated whose bandwidth is about 1.3nm,and the corresponding phases present parabolic structure.