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A Realization Method of Frame Transfer CCD Electronic Shutter

An implementation method and electronic shutter technology, applied in the field of photoelectric detection, can solve the problems of lack of short exposure time and so on

Inactive Publication Date: 2018-01-05
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for ordinary frame transfer CCDs without charge dumping function, there is currently no effective method for realizing short exposure time.

Method used

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  • A Realization Method of Frame Transfer CCD Electronic Shutter
  • A Realization Method of Frame Transfer CCD Electronic Shutter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] The frame transfer CCD47-20 of e2v company has 1027 lines of pixels in the imaging area and 1033 lines of pixels in the storage area. The drive timing control flow to achieve zero exposure time is as follows:

[0026] 1. Control frame transfer clock signal and Continuous vertical transfer 2×(1027+1033)=4120 rows, while controlling the horizontal readout clock signal and Keep the continuous read state, read the reset pulse signal of the circuit Keep it in the reset high level state, so that the useless charge accumulated in the imaging area for a long time during the previous frame image readout is quickly transferred downwards, sent to the horizontal readout register through the storage area, and then horizontally transferred to the readout circuit Then reset it.

[0027] 2. At this time, images with zero exposure time are stored in the imaging area and storage area. If the required exposure time is zero, go to step 5; otherwise, go to step 3;

[0028] 3. The...

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Abstract

The invention relates to a method for realizing a frame transfer CCD electronic shutter, comprising the following steps: controlling the frame transfer clock signal to perform more than four consecutive frame transfer operations, so as to eliminate the useless accumulation of long-term exposure of the imaging area when the last frame image is read out Charges are quickly transferred downwards and sent to the horizontal readout register through the storage area; at the same time as the frame is transferred, the horizontal readout register is controlled to maintain a continuous readout state, and the readout circuit remains in a reset state, so that the useless data continuously transferred from the storage area All charges are sent to the readout circuit to be reset; if the required exposure time is zero, then after cleaning the horizontal readout register, directly read out the image with zero exposure time in the storage area; Read out the image. The present invention can ensure that the imaging area and the storage area are completely cleared through multiple consecutive "frame transfer-readout reset" operations, and no charge will remain in the readout image.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and in particular relates to a method for realizing a frame transfer CCD electronic shutter. Background technique [0002] The current application of ultraviolet / extreme ultraviolet bands has put forward requirements for the exposure time of CCD as short as milliseconds, and system calibration requires images with zero exposure time to characterize system bias or correct Smear phenomenon. The exposure time of ten milliseconds can be achieved by using a mechanical shutter with a full-frame transfer CCD, but its control precision is low, the system is complicated and its reliability is poor. The mechanical shutter can be omitted by using the frame transfer CCD, which quickly transfers the exposure charge of the imaging area to the storage area through the frame transfer operation, and realizes the clearing / resetting of the imaging area at the same time. The time interval between tw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235H04N5/232
Inventor 马庆军宋克非邵英秋
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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