Speckle Noise Reduction in Coherent Imaging Systems
First Claim
1. A method for reducing speckle noise in a coherent imaging system comprising:
- applying a time varying phase gradient across a sample beam of the system to convert spatial distortion to temporal noise;
recording a plurality of measurements of the sample beam; and
averaging the plurality of measurements to reduce the temporal noise.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for reducing speckle noise in a coherent imaging system includes applying a time varying phase gradient across a sample beam of the system to convert spatial distortion to temporal noise, recording a plurality of measurements of the sample beam, and averaging the plurality of measurements to reduce the temporal noise. Another method includes acquiring a plurality of sample scans while modulating a numerical aperture of a sample beam, and concatenating the plurality of scans such that speckle noise is decorrelated from adjacent scans of the plurality of scans. An apparatus for reducing speckle noise includes an optical element for applying a time varying phase gradient across a sample beam of the system to convert spatial distortion to temporal noise, a detector for recording a plurality of measurements of the sample beam, and circuitry for averaging the plurality of measurements to reduce the temporal noise.
-
Citations
21 Claims
-
1. A method for reducing speckle noise in a coherent imaging system comprising:
-
applying a time varying phase gradient across a sample beam of the system to convert spatial distortion to temporal noise; recording a plurality of measurements of the sample beam; and averaging the plurality of measurements to reduce the temporal noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An apparatus for reducing speckle noise in a coherent imaging system comprising:
-
an optical element for applying a time varying phase gradient across a sample beam of the system to convert spatial distortion to temporal noise; a detector for recording a plurality of measurements of the sample beam; and circuitry for averaging the plurality of measurements to reduce the temporal noise. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method for reducing speckle noise in a coherent imaging system comprising:
-
acquiring a plurality of sample scans while modulating a numerical aperture of a sample beam; and concatenating the plurality of scans such that speckle noise is decorrelated from adjacent scans of the plurality of scans.
-
Specification