An optical window for a hypersonic vehicle includes a window substrate and an optical coating on the window substrate, with the coating including multiple alternating layers of different materials. The coating may have many layers, for example having five or more alternating bi-layers and may be configured to still perform its optical function with some of the layers removed, such as by ablation of some of the layers through exposure to hypersonic flow. The different materials of the different layers may have different properties, for example with one of the materials being more resistant to ablation and/or chemical reaction than another of the layers. Coatings for anti-reflection additionally include a region of graded optical index between the sequence of bi-layers and the substrate. The hypersonic vehicle may include an optical sensor which operates by receiving light through the optical window.


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    Title :

    Optical window with abrasion tolerance


    Contributors:

    Publication date :

    2024-01-23


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / B64C AEROPLANES , Flugzeuge / G01J Messen der Intensität, der Geschwindigkeit, der spektralen Zusammensetzung, der Polarisation, der Phase oder der Pulscharakteristik von infrarotem, sichtbarem oder ultraviolettem Licht , MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT



    OPTICAL WINDOW WITH ABRASION TOLERANCE

    FRAZIER GARY A | European Patent Office | 2022

    Free access

    OPTICAL WINDOW WITH ABRASION TOLERANCE

    FRAZIER GARY A | European Patent Office | 2022

    Free access

    OPTICAL WINDOW WITH ABRASION TOLERANCE

    FRAZIER GARY A | European Patent Office | 2024

    Free access

    Abrasion

    Daniels, G. E. | NTRS | 1973


    ABRASION MEASURING APPARATUS AND ABRASION MEASURING METHOD

    KAMEYAMA SATORU / WATABE YUSUKE | European Patent Office | 2020

    Free access