Image dissector tube with light filter

Details Image dissector tube with light filter Image dissector tube with light filter

1985-10-03

1987-10-06

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313524, H01J 3128, H01J 4016

Patent

active

046984968

ABSTRACT:
Photoelectric detection device comprising a vacuum chamber provided with a window having a substrate which bears a photocathode on the internal surface of the vacuum chamber is sensitive to incident light radiation between a short wavelength .lambda..sub.1 bottom threshold and a longer wavelength .lambda..sub.2 upper threshold. Electrons emitted by the photocathode are focused, accelerated and deflected by electronic means to deliver signals or an image representative of luminous events projected onto the photocathode. Window is provided with at least one light filter which determines the wavelength range for which the detection device is operational, eliminating wavelengths greater than a wavelength .lambda..sub.f such that .lambda..sub.1 <.lambda..sub.f <.lambda..sub.2. This light filter can be a pass-band filter which also eliminates wavelengths lower than a wavelength .lambda.'.sub.f such that .lambda..sub.1 <.lambda.'.sub.f <.lambda..sub.f. This filter is preferably an interference filter, arranged on the outside and/or the inside of the vacuum chamber, constituted by a series of thin layers applied to the substrate. The invention has its principal application in image dissector tubes.

REFERENCES:
patent: 2821637 (1958-01-01), Roberts et al.
patent: 3575628 (1971-04-01), Word
patent: 3663913 (1972-05-01), Shaw
patent: 3748523 (1973-07-01), Beyer et al.
patent: 3863093 (1975-01-01), Orthuber
patent: 4004176 (1977-01-01), Otake et al.
patent: 4376889 (1983-03-01), Swift
patent: 4536679 (1985-08-01), Guittard et al.

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