Device for generating images by luminescence effect
AssigneeThomson Tubes Electroniques
InventorPaul de Groot
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Abstract
A device for selecting a remanence of output screens of radiological image intensifier tubes. A luminescent screen (ES1) utilizes two phosphor materials (A, B) exhibiting different remanences and different emission spectra. Wavelength-selective optical filters (Fo) are associated with the luminescent screen ES1 in order to select a remanence chosen by transmitting the corresponding spectral band.
Claims14
An image generating device including a luminescent screen with at least two phosphor materials emitting light with different emission spectra and different remanences wherein said generator device functions in modes producing images resulting from the detection of radiation having different fluctuation levels, said device comprising:
- at least one image detector;
- a light transmission device inserted between the luminescent screen and the image detector wherein said transmission device includes removable filter means for wavelength-selectively altering the quantity of light produced by the luminescent screen and directed towards the image detector whereby the remanence which is most appropriate to the level of detected radiation is selected.
Dependencies are inferred from the claim text.