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دنیای الکترونیک و کامپیوتر - فرمولهای محاسبه انحنای Dish و تعیین فاصله کانونی
 
دنیای الکترونیک و کامپیوتر
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مدیر وبلاگ : مهرداد باژن
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آمار وبلاگ
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امواجی که از فاصله بسیار دور به سطح زمین می رسند باید یک آینه مقعر در یک نقطه که همان کانون می باشد،متمرکزشوند.این کار توسط دیش صورت می گیرد که عملکرد آن دقیقا مانند یک آینه مقعراست.بعضی تصورمی کنند که انحنای دیش قسمت از یک کره  می باشد که این تصور کاملا اشتباه است،چرا که در بین توابع دایره،بیضی، هذلولی و....تنها  سهمی است که رفتارش مشابه آینه مقعر است می باشد.سهمی مکان هندسی نقاطی است که از یک نقطه ویک خط ثابت (خط هادی)به یک فاصله اند ودارای این خاصیت می باشد که امواجی که از بی نهایت به آن برخوردار کنند در نقطه به نام کانون متمرکز می شوند...

برای ساخت دیش با توجه به اینکه در چه نقطه ای از کره زمین قرار داریم وقصد رصد چه ماهواره ای را داریم ابتدا قطر دیش مورد نیاز را بدست می آوریم ، حال با اشتن قطر دیش وعمق دیش که یک عدد دلخواه است،می توان فاصله کانونی دیش را بدست آورد...

برای ساخت دیش های کوچک،عمق دیش (d) را عددی کوچکی انتخاب کنید، چرا که هرچه عمق دیش را بزرگتر انتخاب کنید،انحنای دیش زیاد شده وممکن است در مراحل ساخت وتهیه قالب  برای آن با مشکل مواجه شوید. به عنوان مثال برای ساخت دیش با قطر100 سانتیمتر وعمق 10سانتیمتر با استفاده از فرمول فاصله را بدست می آوریم :

D=100

d=10cm  

n





نوع مطلب : آموزش های الكترونیكی، 
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