Adaptive Aperture Defocused Digital Speckle Photography
| Autor: | Jose M. Diazdelacruz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Physics
Point-to-point Physics - Instrumentation and Detectors Aperture business.industry Materials Science (miscellaneous) Resolution (electron density) FOS: Physical sciences Physics::Optics Instrumentation and Detectors (physics.ins-det) Industrial and Manufacturing Engineering Collimated light Speckle pattern Optics Optical recording Range (statistics) Spatial frequency Business and International Management business Optics (physics.optics) Physics - Optics |
| Popis: | Speckle photography can be used to monitor deformations of solid surfaces. The measuring characteristics, such as range or lateral resolution depend heavily on the optical recording and illumination set-up. This paper shows how, by the addition of two suitably perforated masks, the optical aperture of the system may vary from point to point, accordingly adapting the range and resolution to local requirements. Furthermore, by illuminating narrow areas, speckle size can be chosen independently from the optical aperture, thus lifting an important constraint on its choice. The new technique in described within the framework of digital defocused speckle photography under normal collimated illumination. Mutually limiting relations between range of measurement and spatial frequency resolution turn up both locally and when the whole surface under study is considered. They are deduced and discussed in detail. Submitted to Optics & Laser Technology |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|