Author:
Sun Yuqi,Li Xiaotian,Galantu Jiri,Chu Qihang,Chen Jun,Li Fuguan,Song Nan,Wang Geng,Ni Qiliang
Abstract
This paper introduces an echelle grating spatial heterodyne terahertz Raman spectrometer (E-SHTRS) that combines echelle gratings with spatial heterodyne terahertz Raman spectroscopy technology by replacing the gratings on the interference arms with 36 gr/mm echelle gratings. Echelle gratings are characterized by high diffraction levels and multi-level simultaneous diffraction capability, giving the E-SHTRS higher spectral resolution and a wider detection band range than the conventional spectrometer. The system’s resolution can reach 1.37 cm−1. The spectral detection range of a single level of the proposed system is 701.61 cm−1. A total of nine levels are used in the system, giving a total spectral detection range of 6314 cm−1. Using this system, terahertz Raman spectroscopy of organic acid samples was performed, some food additives and medicines were measured, and a salicylic acid aqueous solution was measured with a minimum measurable concentration of 0.01 mol/L. In addition, the samples were detected over a wide band (10–5131 cm−1) to acquire more complete spectral information. These experiments verify that the E-SHTRS offers good detection performance and has a wide range of possible applications, including a theoretical support role in food safety, biomedicine, environmental protection, and other fields.
Funder
National Natural Science Foundation of China
Jilin Province Research Projects in China
Subject
Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science