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Proceedings Paper

Wafer tube for conversion and intensification of thermal images
Author(s): Boris Efimovich Dashevsky; Alexander L. Surovegin; Vladimir I. Pechorsky
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Paper Abstract

Among various devices intended for radiant flux imaging, those involving direct conversion are most space-saving and cheap. The major difficulty in their implementation is selection of the recording medium and the physical principle of data read-out from this medium. We have developed and tested a wafer tube for direct conversion of thermal images into visible ones using ferroelectric LiTaO3 as the recording medium and employing for read-out purposes the effect of exoelectron emission that accompanies alterations of a ferroelectric polarization. The design and operation principle of a vacuum tube are as follows. Thermal radiation passing through the tube''s germanium input window is focused onto an absorbing coating and transformed into a thermal field which in turn is transformed pyroelectrically into polarized charges distributed over a LiTaO3 target surface facing a MCP. Owing to a vacuum gap between the target and the MCP, the distributed pyroelectric charges are transformed into an electric field that sets over the target surface. Under the action of exoelectron emission the resulting pyroelectric field turns into an electron flux directed toward the MCP input surface. The emission flux amplified by a chevron-type MCP produces an image on a phosphor screen. The earliest manufactured tube enabled resolution of up to 3 p.l./mm for (lambda) equals 10 micrometers .

Paper Details

Date Published: 1 June 1992
PDF: 7 pages
Proc. SPIE 1655, Electron Tubes and Image Intensifiers, (1 June 1992); doi: 10.1117/12.60327
Show Author Affiliations
Boris Efimovich Dashevsky, Radian (Russia)
Alexander L. Surovegin, Radian (Russia)
Vladimir I. Pechorsky, Radian (Russia)

Published in SPIE Proceedings Vol. 1655:
Electron Tubes and Image Intensifiers
C. Bruce Johnson; Bruce N. Laprade, Editor(s)

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