Method of detecting lens cleanliness using out-of-focus differential flat field correction
US11255798B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2021 |
| Grant date | Feb 22, 2022 |
| Priority date | — |
| Expiry date | Sep 24, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/9583
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for detecting lens cleanliness of a lens in a flat-field optical path, the flat-field optical path includes a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens, the method including disposing the camera such that the camera's light-sensitive surface is located a distance from the focal plane of the lens and measuring the bright-field image data and the dark-field image data; for each pixel, performing an out-of-focus differential flat field correction to yield a plurality of DiDj out-of-focus differentials; repeating the disposing and performing steps by altering the distance at least two more times; and displaying the out-of-focus differentials in the form of a plurality of images to show uniformity of each of the plurality of images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.