Optical determination of object distance, velocity and image quality

摘要

An apparatus and method for the optical determination of object distance and velocity or which can alternatively be used to analyse the imaging qualities of an optical system e.g. the human eye employs a laser lightsource (1) to illuminate (2) a point (4) on the object surface (3). The dispersion cone (11) of returned and scattered rays of varying phase and spatial distribution impinges on a double aperture diaphragm (6) and the two emergent beams (14,15) are brought to a focus by the lens (7) to fall together on a photorespective image sensor (8) e.g. a CCD line or matrix camera in the region (9) thereby creating an interference pattern. By examining the type and dimensioning of the pattern the object parameters are derived or corrective ophthalmology undertaken.