Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1989-03-31
1991-06-18
Evans, F. L.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356375, 82 111, 82 12, G01B 1100
Patent
active
050245279
ABSTRACT:
Contact lenses can be made by machining an inner concave surface into a plastics material blank, then mounting the blank in a lathe and machining the outer convex surface thereon. Repeated measurement with a micrometer is needed during the latter machining to ensure that the lens vertex is correctly formed. To avoid this, the sensor described herein comprises a remote laser source from which radiaiton passes the lens vertex in the blank to a detector, the items being arranged so that, when the lens has been correctly machined, a surface diffraction effect occurs at the vertex leading to a detectable signal from the detector. The basis of the technique is the projection of an image of an edge diffraction intensity distribution through a slit to the detector while the non-diffracted component of the laser beam is prevented from reaching the detector. The high intensity laser diffraction edge pattern generates a narrow symmetric output signal from the detector as the edge traverses the slit, thereby enabling test piece positions to be located along the translation axis. The disclosed sensor apparatus may use the same technique during manufacture of items other than contact lenses and may be used for diamond tool profile measurements, for example.
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British Aerospace Public Limited Company
Evans F. L.
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