&lt;title&gt;Investigation of micro-opto-electro-mechanical components with a holographic microscopic interferometer&lt;/title&gt;

Dual-wavelength holography has a better axial range than single-wavelength holography, allowing unambiguous phase imaging. The size of a reconstructed image depends on the reconstruction distance and wavelength. The two phase image sizes of different wavelength holograms should be the same in order to apply dual-wavelength holography. The Fresnel-Bluestein transform method is proposed to eliminate the dependence on the reconstruction distance and wavelength. We found that the Fresnel-Bluestein transform is very useful for making different reconstructed image sizes experimentally. Also we applied the Fresnel-Bluestein transform to make the same reconstruction image size in dual wavelength holography.

Section: 서 론unclassified

A Study on Two-wavelength Digital Holography Using the Fresnel-Bluestein Transform

Shin¹,

Kim²,

2012

“…이러한 방법은 약 30 여년 전 개념적 방법론이 제안되어, CCD의 발전과 컴퓨터 연산 속도의 발전으로 수치적 3차원 영상 재생의 방법이 발 전하여 현재 실용적 용도에 적용하기 위한 다수의 연구들이 세계적으로 활발히 진행되고 있다 [1][2][3][4][5][6] . 이와 같이 측정 대상 체의 3차원 데이터는 홀로그램 방법으로 기록함으로써 1회 촬영으로 측정 대상체의 3차원 데이터를 획득하고, 수치적 재생으로 측정 대상체의 3차원 데이터를 재구성하여 표시 할 수 있으므로 3차원 데이터 획득, 처리, 표시 면에 있어서 성능 향상을 기대할 수 있다 [7][8][9][10] .…”

Section: 서 론unclassified

Study on Error Reduction in Dual Wavelength Digital Holography Using Modified Fine Map

2011

Dual-wavelength holography has better axial range than single-wavelength holography, allowing unambiguous phase imaging but at the expense of increased noise. We have studied error reduction in dual wavelength holography using a modified fine map. The fine map is successful in measurement and has shown error reduction when the height of the object is less than the appled wavelength, but is unstable when the step height is larger than that wavelength. We have modified the fine map and we have found that the modified fine map was successful in measurement and error reduction even though the height of object was larger than the wavelength.

“…속도의 발전으로 수치적 3차원 영상 재생의 방법이 발전하 여 현재 실용적 용도에 적용하기 위한 다수의 연구들이 세계 적으로 활발히 진행되고 있다 [1][2][3][4][5] . 이와 같이 측정 대상체의 3 차원 데이터는 홀로그램 방법으로 기록함으로써 1회 촬영으 로 측정 대상체의 3차원 데이터를 획득하고, 수치적 재생으 로 측정 대상체의 3차원 데이터를 재구성하여 표시 할 수 있 으므로 3차원 데이터 획득, 처리, 표시 면에 있어서 앞서 개 발되어온 첨단 현미경들에 비하여 비교할 수 없을 정도의 성 능 향상을 기대할 수 있다.…”

unclassified

Study on the Two-wavelength Digital Holography Using Double Fourier Transform

Shin¹,

Jung

Yu³

2010

The size of a reconstructed image depends on the reconstruction distance and wavelength. The double fourier transform method is proposed to eliminate the dependence on the reconstruction distance and wavelength. We can get a fixed reconstructed image size by using the double fourier transform method. Two wavelength digital holography is proposed to measure the step height, which is larger than a single wavelength. The two image size of different wavelength holograms should be the same in order to apply two wavelength digital holography. We use two wavelength digital holography and double fourier transforms to measure the step height. The measured data were reasonable and we found that the double fourier transform is useful in two wavelength digital holography.