Temp. dependent imaging contrast improvement - by feeding radiation detector outputs to differential amplifier providing intensity modulation

摘要

The contrast improvement method for temperature dependent imaging equipment compares each point of the scanned image with its surroundings to provide a weighted signal which is subtracted from the image element signal. Alternatively, the image signal is divided by the weighted ambient signal. The resulting signal is used to intensity-modulate the display. The method is suitable for single-detector units or for equipment using detector arrays. The target scene is scanned by mirrors (sp1-2) and the radiation is focussed via an object lens (o) onto twin detectors. The detector outputs are fed to a differential amplifier. The amplifier output signal is used to intensity-modulate the electron beam of the monitor. The monitor scan is synchronised with the mirror movement.