Method for resisting noise of co-phasing system of dispersed fringe sensor and optical system

Patent metadata

Field	Value
Publication number	US-9829718-B2
Application number	US-201615266880-A
Country	US
Kind code	B2
Filing date	Sep 15, 2016
Priority date	Sep 16, 2015
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

The present disclosure provides a method for improving capability of resisting image noise of a co-phasing system of a dispersed fringe sensor. The method comprises the following steps: carrying out a coarse co-phasing adjustment by utilizing the dispersed fringe sensor until the coarse co-phasing is stabilized in a closed loop; collecting a two dimensional dispersed fringe image by the dispersed fringe sensor; superposing the dispersed fringe image along a dispersed direction so as to convert the two dimensional dispersed fringe image to a one dimensional image along an interferential direction; extracting peak values of the main peak, a left side lobe and a right side lobe of the one dimensional image along the interferential direction, and calculating corresponding piston error value of the image by carrying out a Left-subtracting-right LSR algorithm on these peak values.

First claim

The invention claimed is:

1. A method for improving capability of resisting image noise of a co-phasing system of a dispersed fringe sensor applied for an optical system comprising a main mirror system, a dispersed fringe sensor and a processing device, which comprises the following steps:
carrying out a coarse co-phasing adjustment on the main mirror system by utilizing the dispersed fringe sensor until the coarse co-phasing of the main mirror system is stabilized in a closed loop;
collecting a two dimensional dispersed fringe image by the dispersed fringe sensor;
the processing device is configured to carry out the following steps:
1) superposing the dispersed fringe image along a dispersed direction so as to convert the two dimensional dispersed fringe image to a one dimensional image along an interferential direction;
2) extracting peak values of the main peak, a left side lobe and a right side lobe of the one dimensional image along the interferential direction, and calculating corresponding piston error value of the image by carrying out a Left-subtracting-right LSR algorithm on these peak values; and
inputting the calculated piston error value to a closed loop control algorithm to get a control signal and eliminating the piston error according to the control signal.

2. The method for improving capability of resisting image noise of a co-phasing system of a dispersed fringe sensor according to claim 1 , wherein the main mirror in the co-phasing system is a segmented mirror, an optical synthetic imaging aperture or a long baseline interferential telescope.

3. The method for improving capability of resisting image noise of a co-phasing system of a dispersed fringe sensor according to claim 1 , further comprising displaying the calculated piston error value.

4. The method for improving capability of resisting image noise of a co-phasing system of a dispersed fringe sensor according to claim 1 , wherein a moving mechanism of the main mirror in the co-phasing system is controlled in a feedback manner according to the control signal to eliminate the piston error.

5. An optical system comprising a main mirror system, a dispersed fringe sensor and a processing device, wherein the main mirror in the co-phasing system is a segmented mirror, an optical synthetic imaging aperture or a long baseline interferential telescope,
the main mirror system is configured to collect optical signals;
the dispersed fringe sensor is configured to carry out a coarse co-phasing adjustment on the main mirror system until the coarse co-phasing of the main mirror system is stabilized in a closed loop, and is configured to collect two dimensional dispersed fringe images;
the processing device is configured to carry out the following steps: superposing the dispersed fringe image along a dispersed direction so as to convert the two dimensional dispersed fringe image to a one dimensional image along an interferential direction;
extracting peak values of the main peak, a left side lobe and a right side lobe of the one dimensional image along the interferential direction, and calculating corresponding piston error value of the image by carrying out a Left-subtracting-right (LSR) algorithm on these peak values; and inputting the calculated piston error value to a closed loop control algorithm to get a control signal and eliminating the piston error according to the control signal.

6. The optical system according to claim 5 , wherein the main mirror in the co-phasing system is a segmented mirror, an optical synthetic imaging aperture or a long baseline interferential telescope.

7. The optical system according to claim 5 , further comprising a display configured to display the calculated piston error value.

8. The optical system according to claim 5 , further comprising a feedback adjusting device which is configured to receive the control signal from the processing device, and to control an actuate system for the main mirror in the co-phasing system in a feedback manner according to the control signal to eliminate the piston error.

Assignees

• Inst Optics & Electronics Cas

Inventors

• Rao Changhui
• Li Yang
• Wang Shengqian

Classifications

• G02B27/58 Primary

  Optics for apodization or superresolution; Optical synthetic aperture systems · CPC title

• G02B23/02

  involving prisms or mirrors (G02B23/14 takes precedence) · CPC title

• G02B27/0087

  Phased arrays · CPC title

• G02B23/12

  with means for image conversion or intensification · CPC title