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Construction and Experimental Study of Micro-area Raman OpticalSystem Based on Differential Confocal Microscopy Technology |
JIANG Jing-zi1, GAO Si-tian2, HUANG Lu2, LI Qi2, LIAN Xiao-yi2 |
1.Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
2.National Institute of Metrology, Beijing 100029, China |
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Abstract A micro-area Raman optical system based on differential confocal microscopy technology is developed to detect the micro-area Raman spectroscopy of inorganic samples. The traditional confocal Raman spectroscopy technology does not emphasize the focusing ability of the system, but the optical system device has the function of long-time focusing by using on the characteristic that the zero-crossing point of the differential confocal curve corresponds precisely to the focal point position and adopting feedback control technology. When collecting Raman scattering signals in micro-area, multi-mode optical fiber spatial coupling technology is used to replace traditional physical detection pinholes with optical fiber, which improves the anti-interference ability of the environment and optimizes the system structure and adjusting performance. The experimental results show that the device has high stability and can effectively detect the Raman frequency shift of single-walled carbon nanotubes at 1581.510cm-1, 2708.065cm-1 characteristic peaks and the Raman frequency shift of pure sulfur at 153.113cm-1, 219.917cm-1, 473.322cm-1 characteristic peaksand realize the single-line detection of the carbontube. The device meets the design requirements of the spectral detection system.
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Received: 08 November 2018
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Corresponding Authors:
Email:gaost@nim.ac.cn
E-mail: gaost@nim.ac.cn
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