Comparison of two reflecting surfaces by using digital holographic interferometry
| Autor: | Giancarlo Pedrini, Hans J. Tiziani, Yunlu Zou |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Physics
Surface (mathematics) business.industry Holography Curved mirror Image plane Holographic interferometry Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Optics law Frame grabber Fresnel number Electrical and Electronic Engineering Physical and Theoretical Chemistry business Fresnel diffraction |
| Zdroj: | Optics Communications. 118:186-192 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/0030-4018(95)00248-7 |
| Popis: | In this paper we describe a digital holographic system for the comparison of two reflecting surfaces (e.g. spherical mirrors). Two holograms of the two objects to be compared are recorded using a CCD-camera and stored in a frame grabber. Two methods are presented. In the first method we record image plane holograms and the sinusoid fitting is used in order to determine the phases of the two wavefields. In the second we record Fresnel holograms and reconstruct the wavefields by simulating the Fresnel diffraction of the holograms illuminated by the reference wave. The phases of the two wavefields are calculated from the complex amplitudes. The surface shapes are compared by phase difference. Experimental results are presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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