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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Diverse Raman measurement schemes for reliable non-destructive analysis of samples: Axially perpendicular offset (APO) and axial illumination schemes

등록일
2014년 8월 28일 13시 50분 30초
접수번호
0903
발표코드
ANAL2-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 14시 : 20분
발표형식
심포지엄
발표분야
분석화학 - Recent Developments in Chemical Analysis Methods
저자 및
공동저자
정회일
한양대학교 화학과, Korea
An axially perpendicular offset (APO) scheme able to directly acquire reproducible Raman spectra of samples contained in an oval container even under the variation of the container orientation has been demonstrated. It utilized the axially perpendicular geometry between the laser irradiation and photon detection, namely the irradiation through a sidewall of the container and gathering of Raman photon just beneath the container. The APO scheme provided the best accuracy when the axial offset distance was 10 cm. To rationalize the found optimal offset distance, a simulation based on Monte-Carlo method was used to study the characteristics of photon migration in the APO scheme. Next, we have demonstrated a simple and effective strategy, so called axial illumination schemes, to obtain representative Raman spectra of suspension samples with minimal influence by internal particle-settling. The proposed schemes irradiates laser radiation axially with the same or opposite direction of settling, so allowing laser photons to migrate through the settling-induced particle-density gradient formed in a suspension and widely interact with particles regardless of their settled locations. Therefore, transmitted Raman information gathered at opposite of the illumination could be better representative of overall suspension composition even with the occurrence of partial settling.

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