Method and system for measurement of a characteristic of lens
First Claim
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1. 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.
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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.
11 Citations
23 Claims
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1. A method of determining a characteristic of a graded-index lens comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. 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:
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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. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method of determining a characteristic of a graded-index lens comprising the steps of:
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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.
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Specification