Diffraction Effects In Ir Half-Tone Transparencies

    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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