光谱学与光谱分析 |
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Fourier Transform Spectrometer Based on Rotating Parallel-Mirror-Pair |
ZHAO Bao-wei1, XIANGLI Bin1, 2, CAI Qi-sheng3, Lü Qun-bo2*, ZHOU Jin-song2 |
1. Xidian University, Xi’an 710071, China 2. Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, China 3. University of Science and Technology of China, Hefei 230026, China |
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Abstract In the temporally-modulated Fourier transform spectroscopy, the translational moving mirror is difficult to drive accurately, causing tilt and shear problems. While, a rotational moving mirror can solve these problems. A rotary Fourier transform spectrometer is recommanded in this paper. Its principle is analyzed and the optical path difference is deduced. Also, the constrains for engineering realization are presented. This spectrometer consists of one beamsplitter, two fixed mirrors, one rotating parallel mirror pair, a collimating lens, a collecting lens, and one detector. From it’s principle, this spectrometer show a simple structure, and it is assembled and adjustmented easily because the two split light are interfered with each other after reflected through the same plane mirror; By calculating the expression of it’s optical path difference, the spectrometer is easy to realize large optical path difference, meaning high spectral resolution; Through analyzing it’s engineering design constraints and computer simulation, it is known that the spectrometer should get the high resolution sample by high-speed spinning motor, so it is easy to achieve precise motion control, good stability, fast measurement speed.
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Received: 2014-05-20
Accepted: 2014-09-12
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Corresponding Authors:
Lü Qun-bo
E-mail: lvqunbo@aoe.ac.cn
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