Title

Diffraction Effects In Ir Halftone Transparencies

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 suitbale for application in halftone transparencies in the 3-5 and 8-12 μm bands in the IR. A theoretical model is developed, based on vector diffraction theory, that agrees with measurements within ±2% for the 3-5 μm and ±3% for 8-12 μm spectral regions. Results are that the transmittance is proportional to the aperture area, for apertures larger than four times the wavelength. © 1995.

Publication Date

1-1-1995

Publication Title

Infrared Physics and Technology

Volume

36

Issue

2

Number of Pages

623-637

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/1350-4495(94)00099-7

Socpus ID

58149364205 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/58149364205

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