Title

Diffraction Effects In Ir Half-Tone Transparencies

Authors

Authors

A. Daniels; G. D. Boreman;E. Sapir

Comments

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Abbreviated Journal Title

Infrared Phys. Technol.

Keywords

Instruments & Instrumentation; Optics; Physics, Applied

Abstract

Halftone transparencies are a useful tool for performance characterization of IR systems. This paper describes halftone transparencies called thermoscenes, which are lithographically produced patterns of apertures in a metallic coating placed on a transparent IR substrate. To fabricate thermoscene transparencies that are radiometrically accurate, a linear dependence is desired between aperture size and transmittance. We examine the transmittance as a function of hole size for structures suitable for application in halftone transparencies in the 3-5 and 8-12 mum bands in the IR. A theoretical model is developed, based on vector diffraction theory, that agrees with measurements within +/- 2% for the 3-5 mum and +/- 3% for 8-12 mum spectral regions. Results are that the transmittance is proportional to the aperture area, for apertures larger than four times the wavelength.

Journal Title

Infrared Physics & Technology

Volume

36

Issue/Number

2

Publication Date

1-1-1995

Document Type

Article

Language

English

First Page

623

Last Page

637

WOS Identifier

WOS:A1995QG90000006

ISSN

1350-4495

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