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shimi&life - میکروسکوپ الکترون روبشی
shimi&life
شنبه 3 دی 1390

میکروسکوپ الکترون روبشی

شنبه 3 دی 1390

نوع مطلب :
نویسنده :zahra mohammadi

میکروسکوپ

در میکروسکوپ الکترونی روبشی (SEM) هم مانند میکروسکوپ الکترونی عبوری (TEM)، یک پرتو الکترونی به نمونه می‌تابد. درنتیجه بعضی قسمت‌ها نظیر تفنگ الکترونی، عدسی‌های متمرکزکننده و سیستم خلأ، در هر دو دستگاه مشابه است. اما روش تشکیل تصویر و نحوه بزرگنمایی کاملاً متفاوت است. علاوه بر این، TEM اصولاً برای مطالعه ساختار نمونه‌های حجیم درسطح یا نزدیکی سطح، استفاده می‌شود. درک این نوع تصویر بسیار آسان‌تر از تصویر الکترونی عبوری است.




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دوشنبه 20 شهریور 1396 04:01 ق.ظ
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یکشنبه 19 شهریور 1396 09:19 ب.ظ
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