A tdi‑ccd drive signal generator capable of external triggering

Abstract

Disclosed is a TDI-CCD drive signal generator capable of realizing external trigger and the external-trigger TDI-CCD drive signal generator includes an external-trigger signal processing module and an external-trigger CCD drive signal generating module, wherein the external-trigger CCD drive signal generating module includes a crystal oscillator, a frequency demultiplication module, an RG pulse generation module, a 1536 counting module, an envelope line generation module and a not-gate time sequence synthesis module. The external-trigger TDI-CCD drive signal generator realizes that a signal transference speed of a TDI-CCD can be randomly changed via external trigger and compared with a traditional CCD drive signal generator, the external-trigger TDI-CCD drive signal generator is capable of acquiring speed signal pulses of an external moving object and changing internal transference clock signals of the CCD through external trigger, that is, changing of an integral time of the CCD, so that real-time accurate matching of a transference speed of the internal signals of the CCD and a scanning speed of the moving object is realized and effect of an overall signal generation circuit is improved significantly; and X-ray imaging is carried out on the moving object so that imaging resolution is improved and applicable range of a drive circuit is expanded.

Description

technical field [0001] The invention relates to a signal generator, which belongs to the field of drive signal output, in particular to a TDI-CCD drive signal generator capable of realizing external triggering. Background technique [0002] TDI-CCD (Time Delay Integration Charge Coupled Devices, Time Delay Integration Charge Coupled Devices) is a special linear array photoelectric sensor, which uses time delay integration technology to expose the same target multiple times, and can be obtained under low illumination conditions. High-sensitivity, high-spatial-resolution images. Compared with ordinary linear array photoelectric sensors, TDI-CCD has an integral time delay (Time Delay Integration, TDI) function, which can perform multiple exposures on the same target, and enhance the collection of light energy through the method of delay integration, which can realize X-ray imaging of moving objects. Compared with ordinary linear array photoelectric sensors, it has many techni...

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Problems solved by technology

like figure 1 As shown, the crystal oscillator provides a global clock for the logic device, and the timing cycle of the logic signal circuit is fixed, so that the integration time of the TDI-CCD cannot be adjusted, that is, the signal transfer speed of the CCD is fixed, and the signal transfer speed of the CCD cannot be changed by an external trigger. The internal transfer signal speed of TDI-CCD cannot match the scanning speed of external moving objects in real time, resulting in unclear X-ray imaging of moving objects, which limits the application of TDI-CCD

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