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A Method of Improving the Anti-noise Ability of the Universal System of Dispersive Fringe Sensor

A sensor and anti-noise technology, which is applied in the field of extracting translation errors, can solve the problems of anti-noise ability and engineering implementation complexity, and achieve the effect of improving image signal-to-noise ratio

Active Publication Date: 2017-12-26
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to overcome the deficiencies in the anti-noise ability and complex engineering implementation of the existing translation error detection method when the dispersion fringes are in perfect phase

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  • A Method of Improving the Anti-noise Ability of the Universal System of Dispersive Fringe Sensor
  • A Method of Improving the Anti-noise Ability of the Universal System of Dispersive Fringe Sensor
  • A Method of Improving the Anti-noise Ability of the Universal System of Dispersive Fringe Sensor

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Embodiment Construction

[0025] The present invention is further described in detail in conjunction with the following examples.

[0026] Such as figure 1 As shown, the dispersion fringe sensor co-phase system targeted by the method of the present invention is composed of a primary mirror system, a dispersion fringe sensor, and a computer. In the Microsoft Visual Studio 2008 programming environment, use C++ language for programming. The size of the dispersion fringe image collected by the dispersion fringe sensor is 512×32 pixels, and the number of data bits is 8 bits.

[0027] The present invention is a method for improving the anti-noise ability of the co-phase system of the dispersion fringe sensor, which is realized according to the following steps:

[0028] Step a. The translation error between the sub-mirrors of the primary mirror is greater than half a wavelength, and coarse co-phase is required first. Use the dispersive fringe sensor to perform coarse co-phase on the primary mirror, and whe...

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Abstract

The invention discloses a method for improving the anti-noise ability of a dispersion fringe sensor common phase system, which comprises the following steps: using a dispersion fringe sensor to perform rough common phase, and using the steps described in the method to extract translation errors after the rough common phase closed loop is stable. The dispersion fringe image collected by the dispersion fringe sensor is processed by the computer as follows: the dispersion fringe image is accumulated along the dispersion direction, and it is changed from a two-dimensional image to a one-dimensional image that only retains the dimension of the interference direction through accumulation. By extracting the main peak, left side lobe, and right side lobe peaks of the above-mentioned one-dimensional image with only the interference direction dimension, and then using the LSR (Lift Subtract Right) algorithm to obtain the corresponding translation error value of the image. Through the above process, the influence of the noise of the dispersion fringe image collected by the dispersion fringe sensor on the extracted translation error can be reduced, thereby improving the anti-noise ability of the common phase system of the dispersion fringe sensor, and the method of the present invention hardly increases the engineering complexity and cost.

Description

technical field [0001] The invention relates to a method for extracting translation error (piston error) for improving the anti-image noise ability of a dispersion fringe sensor common phase system. Background technique [0002] The dispersive fringe sensor has been used as the translation error detector of the James Webb Space Telescope (JWST) and the Large Magellan Telescope (GMT) in the United States, but due to the noise and translation error extraction of the dispersive fringe image Influenced by the method, the dispersive fringe sensor is only used in the coarse cophase phase of the two telescopes. [0003] At present, a method for improving the fine universal phase detection capability of the dispersive fringe sensor has been proposed (see W.Zhao and G.Cao, "Active co-phasing and aligning testbed with segmented mirrors," Opt.Express, 19 (9), 8670 -8683 (2011)). The specific method is to extract a one-dimensional interference image from the interference direction of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
CPCG02B27/0087G02B27/58G02B23/12G02B23/02
Inventor 饶长辉李杨王胜千
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI