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  • 09월 04일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Development of a miniature fourier transform IR spectrometer based on Lamella grating

2014년 9월 1일 18시 52분 08초
PHYS.P-477 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
조충만, 최은우, 김성규*
성균관대학교 화학과, Korea
The interferometers which conventional fourier transform IR spectrometers adopt occupy a large space and may be prone to misalignment under external shocks, which are undesirable as a miniature spectrometer to be used for on-site spectrum acquisition and analysis. There have been interests and efforts in replacing the bulky interferometer by an optical component fabricated by MEMS techniques. In this respect, Lamella grating may be a good candidate. The Lamellar grating consists of a pair of transmission gratings, in which one pair is translated while the other is fixed. The relative distance of the two gratings produce the phase difference of the reflected lights off the two; the interferogram is recorded as the distance is varied. One limitation of the fourier transform spectrometer in this new optical arrangement, as a tradeoff for miniaturization, is in the spectral resolution. The maximum distance between the two gratings is limited, as an AC voltage must be used to drive one grating translation. The other resolution limit arises since the light field transmitted from the front grating forms an undesirable field image (e.g. Talbot image) before the rear grating. Such undesirable field image may distort the spectrum and limit the spectral resolution. In a preliminary work, we calculated the light field using 1-dimensional scalar diffraction theories such as Rayleigh-Sommerfeld approximation or Fresnel diffraction. We will discuss the spectral resolution of the Lamellar grating fourier transform IR spectrometer based on the field calculation. We will also show the current stage of the developing the miniature fourier transform spectrometer based on the Lamella grating.

[1] Ferhanoglu, O.; Seren, H. R..; Lutterjohann, S.; Urey, H. Lamellar grating optimization for miniaturized fourier transform spectrometers Opt. Express. 2009, 17, 21289-21301.