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US 8,619,405 B2Granted
Wavefront sensor
AssigneeWaveTec Vision Systems, Inc.
InventorAnthony Y. Van Heugten
Life of this patent
Estimating the term…
Abstract
The present invention relates to a wavefront sensor using a pair of screens, each having a two-dimensional array of circular apertures, to achieve Moiré effects, and its use to measure the slope of a wavefront.
Claims33
An apparatus comprising:
- a) a first screen comprising a first two-dimensional array of circular apertures, wherein the first screen is placed downstream of a light source;
- b) a second screen comprising a second two-dimensional array of circular apertures, wherein the second screen is placed downstream of the first screen, the second screen is in a plane parallel to the first screen, and the second screen is rotated relative to the first screen;
- and
- c) a light detector downstream of the second screen.
1 more element
A method of measuring characteristics of a lens comprising:
- a) directing light into the lens;
- b) directing the light from the lens through a first screen comprising a first two-dimensional array of circular apertures;
- c) directing the light from the first screen through a second screen comprising a second two-dimensional array of circular apertures, wherein the second screen is placed downstream of the first screen, the second screen is in a plane parallel to the first screen, and the second screen is rotated relative to the first screen;
- d) detecting the light from the second screen at a light detector.
1 more element
A method of measuring characteristics of an eye comprising:
- a) directing light into the eye;
- b) directing the light from the eye through a first screen comprising a first two-dimensional array of circular apertures;
- c) directing the light from the first screen through a second screen comprising a second two-dimensional array of circular apertures, wherein the second screen is placed downstream of the first screen, the second screen is in a plane parallel to the first screen, and the second screen is rotated relative to the first screen;
- d) detecting the light from the second screen at a light detector.
1 more element
Dependencies are inferred from the claim text.