The Study of Infrared Spectrum by Using Interferometry

• Main Authors: Yu-Wen Chen, 陳昱文
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/92049058222514885131

碩士 === 逢甲大學 === 光電物理研究所 === 91 === The purpose of this study is due to a conventional spectrograph, which is produced by using a prism or a diffraction grating to disperse the light source, has some disadvantages. For example, it has a low resolution, long measuring time, and low detectivity for very weak source etc. Hence scientist developed an interferometric technique to separate the spectral elements for solving these problems. This paper investigates the principle of dispersing the spectral elements by a using modified Michelson interferometer. This interferometric spectrometer has some features which are invaluable for traditional spectrometer. It possesses a multiplex property that can reduce enormously the time required to separate the spectral elements and a modulation function that can make randomly incident information into an analytic one. It can cause a detector strongly accept the weak interference signal, and simultaneously promote the resolution of the spectrum. We just make use of these properties to separate the spectral elements. The paper will further verify the experimental interference pattern which is formed from enormously random frequencies of incident light in terms of theoretical analysis and computer simulation.