مدولاسیون دمایی حسگر گاز مبتنی بر اکسید قلع جهت تشخیص خلوص سرکه با استفاده از الگوریتم k نزدیکترین همسایگی
الموضوعات :وحید خرمشاهی 1 , فاطمه صفری 2 , علی فاتحی فر 3
1 - مرکز تحقیقات مواد و انرژی، واحد دزفول، دانشگاه آزاد اسلامی، دزفول، ایران
2 - مرکز تحقیقات مواد و انرژی، واحد دزفول، دانشگاه آزاد اسلامی، دزفول، ایران
3 - دانشگاه آزاد اسلامی واحد دزفول
الکلمات المفتاحية: اکسید قلع, مدولاسیون دما, بینی الکترونیکی, حسگر گاز, طبقه بندی.,
ملخص المقالة :
مدولاسیون دما در حسگرهای گاز مبتنی بر اکسیدهای فلزی، از جمله SnO₂، موجب تغییر دمای عملیاتی حسگر می‌شود. این تغییرات، حساسیت و گزینش‌پذیری حسگر را در تشخیص اسید استیک موجود در سرکه افزایش داده و امکان تعیین خلوص سرکه را فراهم می‌کنند. در مدولاسیون دمایی حسگرهای گاز، از چرخه‌های دمایی برای ثبت پاسخ حسگر به ترکیبات مختلف استفاده می‌شود. این پاسخ‌ها به‌عنوان ویژگی‌های طبقه‌بندی استخراج شده و امکان تمایز و شناسایی ترکیبات را فراهم می‌کنند. در این پژوهش، با استفاده از الگوریتم نزدیکترین همسایه، ویژگی‌های استخراج‌شده به‌طور مؤثری برای طبقه‌بندی نمونه‌های سرکه و تعیین خلوص آن‌ها به کار گرفته شد. به ریزگرمکن حسگر گاز MQ2 یک ولتاژ مربعی اعمال شد که موجب تغییر دمای حسگر و ایجاد الگوهای متمایز در پاسخ آن گردید. پاسخ ولتاژ حسگر به بخارات سرکه با خلوص‌های مختلف در سه مرحله ثبت شد. از هر الگوی ایجادشده در پاسخ حسگر، هفت ویژگی متمایز انتخاب شد که به‌عنوان ورودی‌های الگوریتم طبقه‌بندی مورد استفاده قرار گرفتند. دقت الگوریتم پیشنهادی در تشخیص خلوص سرکه برابر با ۸۶ درصد بوده و این روش قابلیت استفاده در سیستم‌های تشخیص خودکار را دارد.
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