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L2-B

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الكلية كلية العلوم للبنات     القسم قسم فيزياء الليزر     المرحلة 3
أستاذ المادة جاسم محمد جاسم الشهبات       18/11/2016 03:20:01
WINDOWS
During the Apollo (manned lunar exploration) space program, thousands of pictures were taken from inside the space vehicle of objects and phenomena on the moon and in outer space. These pictures constituted basic scientific data. From them, objects were identified, topography was mapped, courses were charted, phenomena were observed and records were maintained.
The accuracy and validity of the data were, among other things, dependent on the windows’ ability to transmit images from outside the spacecraft to the inside for photographic recording without significant distortion. These windows also had to help to maintain a positive atmosphere inside the spacecraft. They had to prevent excessive solar radiation from entering and heating the vehicle, and withstand the intense heat and shock met on reentry to the earth’s atmosphere.
This example of an optical window demonstrates that windows are precision optical components that must be selected, specified, and designed prior to construction and usage. Optically, a window should appear as though it were not there. Windows most commonly are used in these two classes of applications:
1. To retain a specific gas pressure or a partial vacuum in a tube or other enclosure.
2. To prevent dust, moisture or other particles from entering the system.
A window could be deemed as a pane of glass or other transparent material used to transmit light with negligible distortion and to isolate the atmospheric and thermal environments on either side.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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