Method and system for measurement of a characteristic of lens
AssigneeJDS Uniphase Corporation
InventorsPaul Colbourne, Jian Jim Yang, Geoff Randall
Life of this patent
Estimating the term…
Abstract
A method and system are provided for measuring a characteristic of a lens. By directing light to a lens, and receiving reflected light from a opposite end faces of the lens on an image plane, a determination from the focused spots on the image plane can be made as to a characteristic of the lens, such as its focal length.
Claims23
A method of determining a characteristic of a graded-index lens comprising the steps of:
- receiving light from two end faces of a graded-index lens within a distant light receiving/detection region;
- locating a first focus spot from light received from one of the two end faces;
- locating a second focus spot from the other of the two end faces of the lens;
- and determining a characteristic of the graded-index lens from the locations of the two focus spots.
An optical system for measuring a characteristic of a lens related to its focal length or its gradient, the lens having a partly reflective front end face and a reflective rear end face, the system comprising:
- means for temporarily holding the lens during testing thereof;
- a light source for irradiating the lens;
- a beam splitter for directing light that has been received from the lens to an image plane;
- means for relatively moving the lens and the image plane to vary a distance therebetween;
- means for locating a first focus spot from light received from one of the two end faces and for locating a second focus spot from the other of the two end faces of the lens;
- and
- means for determining a characteristic of the lens from location of the two focus spots.
A method of determining a characteristic of a graded-index lens comprising the steps of:
- receiving light from two end faces of a graded-index lens within a distant light receiving/detection region;
- locating a first focus spot from light received from one of the two end faces;
- locating a second focus spot from the other of the two end faces of the lens;
- and determining a characteristic of the graded-index lens from a distance traversed to locate the two focus spots.
Dependencies are inferred from the claim text.