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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2015.4
- 수록면
- 165 - 168 (4page)
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초록· 키워드
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A simple method to determine the focal length of a lens using the Talbot image is presented. Thismethod uses only one grating, requiring neither Moiré fringe analysis nor the angle between the gratings.
The original Fourier transform was used to access the spectrum beyond the limitation set of the usualfast Fourier transform to determine the (de)magnification accurately enough to be used for the focal length.
A set of Talbot images simulated numerically with the Fresnel diffraction integral was used to demonstratethe method. For focal lengths between 5550 mm and 5650 mm, the mean difference between the focallengths determined from the Talbot images and the true values was 3.3 mm with the standard deviationof the difference being 3.8 mm. The true focal lengths can be recovered with an accuracy of 0.06%
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