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An image of the near-field light distribution in a multimode optical fibre was required so that the modal parameters could be determined. A high quality machine-vision CCD camera was chosen having 768 x 574 picture elements, or pixels. An imaging system was then designed to give (a) a field-of-view commensurate with the fibre sizes to be measured, and (b) an optical resolution commensurate with the physical pixel size in the camera. Increasing the numerical aperture of the optics in this type of application does not always lead to a better image quality if the pixel size is not sufficiently small to make use of the extra resolution. For some more notes on digital imaging, click here. For details on resolution and depth of field, click here. |
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Requirement: High quality imaging using a CCD camera |
