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Internal response difference correction method for charge coupled device (CCD) pixel

A pixel, difference technology, applied in the field of astronomical data processing, can solve the problems of high telescope precision requirements, difficult to achieve with small-diameter telescopes, etc., to achieve good results, easy implementation, direct and convenient operation and implementation.

Inactive Publication Date: 2013-06-26
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Problems solved by technology

The "jitter" method has high requirements on the precision of the telescope finger, which is difficult to achieve with a small-aperture telescope. At the same time, due to the limitation of the observation mode, the "jitter" method is not suitable for the correction of the CCD internal response difference of this type of telescope.

Method used

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  • Internal response difference correction method for charge coupled device (CCD) pixel
  • Internal response difference correction method for charge coupled device (CCD) pixel
  • Internal response difference correction method for charge coupled device (CCD) pixel

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Experimental program
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Embodiment

[0054] (1) Observation equipment: the aperture of the telescope lens is 7 cm, and the CCD model is: ALTA U9000 front-illuminated type with 3056×3056 pixels, and each pixel corresponds to 12.6 arc seconds. The point spread function (PSF) of the star image has a full width at half maximum (FWHM) of 1.2 pixels (corresponding to 1.5 arcseconds).

[0055] (2) Select an observation night with good weather to construct the observation of the two-dimensional correction map of the internal response difference of the pixel, and the specific data collection and processing requirements and processes are carried out according to the requirements described in the "specific implementation mode" of the present invention. The finally obtained two-dimensional correction image of internal response difference of 16 groups of 4×4 pixels is as follows: Figure 4 Shown:

[0056] (3) Select photometric observations at other times, according to the processing steps described in the present invention,...

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Abstract

The invention discloses an internal response difference correction method for a charge coupled device (CCD) pixel. The correction is realized by utilizing strong correlation between the measurement flow error of an observational star brought by the internal response difference in the CCD pixel and the normalized centric coordinates of the observational star. The two-dimensional correction map of the CCD target surface grouping is established through the actual timing sequence photometric observations, the measured data can find the corresponding two-dimensional correction map according to the observed star image central coordinate and the normalized coordinate, and the corresponding flow correction amount is obtained from the map; and finally, the correction of the photometric error brought by the internal response difference of the CCD pixel is realized, and the photometric precision is improved.

Description

technical field [0001] The invention relates to a method for correcting the internal response difference of a CCD pixel, which is suitable for astronomical data processing that needs to correct the photometric flow error caused by the internal response difference of the CCD pixel in astronomical observation. It is especially suitable for observation equipment with wide field of view, low sampling rate and front-illuminated CCD, which can significantly reduce the photometry error caused by the internal response difference of CCD pixels. Background technique [0002] Charge Coupled Device (CCD for short), which is made of a high-sensitivity semiconductor material, can convert light signals into charge signals, and convert them into digital signals through analog-to-digital converter chips, digital signals After compression, it is stored by the flash memory inside the camera or the built-in hard disk card, so the data can be easily transmitted to the computer, and the image can...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
Inventor 吴潮裘予雷魏建彦邓劲松
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI