Wavefront error correction system and method for inhibiting speckle noises of coronagraph system

A technology for correcting system and speckle noise, which is applied in the optical field to achieve the effects of correcting wavefront error, suppressing speckle noise, and improving imaging contrast

Inactive Publication Date: 2013-11-20
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the speckle nulling method has the following disadvantages: 1) The speckle nulling method uses linear approximation in the detection and correction of wavefront errors, and the algorithm is only in the range of small aberrations (that is, sat

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wavefront error correction system and method for inhibiting speckle noises of coronagraph system
  • Wavefront error correction system and method for inhibiting speckle noises of coronagraph system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0042] The invention provides a coronagraph system speckle noise correction system, such as figure 1 As shown, the telescope pupil 10 is placed in front of the coronagraph system 20, and the correction system is placed in front of the coronagraph system 20. The correction system includes a first lens 1, a first deformable mirror 2, a second deformable mirror 3, and a beam splitter 4. The second lens 8, the image plane detector 9, the third lens 5, the fourth lens 6, the amplitude detector 7 and the processor, wherein:

[0043] The first lens 1 is placed in the rear optical path of the back focal plane of the coronagraph system 20, the first deformable mirror 2 is placed in the transmission optical path of the first lens 1, and the light emitted by the object enters the coronagraph system from the telescope pupil 10 20, and initially imaged on the b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a wavefront error correction system and method for inhibiting speckle noises of a coronagraph system. A processor is used for outputting a control voltage signal to an actuator in a first deformable mirror according to light strength information received from an amplitude detector and driving the first deformable mirror to correct a wavefront amplitude error; the processor is used for outputting a control voltage signal to an actuator in a second deformable mirror according to light strength information received from an image surface detector and driving the second deformable mirror to correct a wavefront phase error so as to inhibit the speckle noises of the coronagraph system in a dark hole region of the image surface detector. The invention discloses a wavefront error correction method for inhibiting the speckle noises of the coronagraph system. The method comprises the following steps: firstly, selecting a suitable evaluation function according to the selected coronagraph system; adopting a random gradient descent algorithm to apply disturbance voltage signals to the actuators of the deformable mirrors by a plurality of times of iteration; and finally, enabling the evaluation function to be the minimum so as to correct the wavefront errors and greatly improve the imaging contrast ratio of a coronagraph.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a correction system and method for speckle noise of a coronagraph system. Background technique [0002] In order to avoid the influence of atmospheric turbulence on imaging contrast, the direct imaging detection of terrestrial planets will be realized with the help of space telescopes in the future. The speckle noise caused by the quasi-static mirror surface shape error of the space telescope will be the main factor restricting the imaging contrast. The calculation results based on the surface shape error of the Hubble Space Telescope's primary mirror show that the speckle noise caused by the surface shape error will be 104 times brighter than the planet (assuming that the contrast between the planet and the star is 10-9), and effective measures must be taken to reduce the speckle noise to eliminate or suppress. Adaptive optics technology is one of the key technologies for sup...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G02B26/06
Inventor 董冰覃顺胡新奇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap