انسان همواره در پی کشف حقایق و قوانین حاکم بر طبیعت زندگی خود بوده است. و از گذشته تا کنون با استفاده از روشهای ساده و پیچیده، راههای مختلفی را به منظور شناسایی عوامل محیطی به کار گرفته است. امروزه نیاز به حسگرهای دقیق در کاربردهای محیط زیستی، کشاورزی، صنعتی، تشخیصهای پزشکی و ... احساس می شود. در واقع، حسگرها، تبدیل کنندههای انرژی به یک نوع انرژی معین هستند که منجر به تولید یک سیگنال خروجی قابل فهم و قابل پردازش ایجاد می شود. حسگرهای گاز، دستهی مهمی از حسگرها هستند که قادرند نوع و غلظت یک گاز معین را در محیط شناسایی کنند.
در طراحی این حسگرها، گازی که غلظت آن مدّ نظر است را گاز هدف (target)مینامند. این گاز با تغییر در خواص فیزیکی و یا شیمیایی افزاره شناسایی میگردد. و برمبنای میزان تغیرات ایجاد شده توسط گاز هدف، نسبت به زمان عدم حضور آن غلظت محاسبه میشود. تاکنون روشهای مختلفی در حسگری گازها به کار گرفته شده است. تغییر رسانایی نیمههادیهای جاذب گاز، تغییرات اپتیکی و تغییرات دمایی از این دسته اند. جدول1 خلاصهای از روشهای موجود را نشان می دهد.
در چند دههی اخیر، نیمههادی به دلیل جذب مناسب، حساسیت بالا، قابلیت کوچکسازی و قیمیت پایین مورد توجه قرار گرفتهاند. با استفاده از موادی چون اکسید روی، اکسید مس و اکسید قلع، حسگرهایی با حساسیت یک قسمت در میلیارد (1 ppb) حاصل شده است. به کار بردن نانوساختارها همانند نانولولههای کربنی، نانوذرات و نانوسیمهای فلزی همگی روشهایی برای افزایش حساسیت حسگرهای نیمههادی محسوب می شود.
امروزه با وجود پیشرفتهای گسترده و حتی ارائه نمونههای تجاری، طراحی و ساخت حسگرها با چالشهایی چون طول عمر، تکرار پذیری، قدرت تشخیص کم و قابلیت مجتمع سازی مواجه است. به کارگیری فنآوری میکرو و نانو روش مؤثری در بهبود عملکرد حسگرها است. انتظار می رود با استفاده از این تکنیکها روز به روز شاهد پیشرفت این افزارهها بود.
جدول 1- انواع حسگرهای گازی مورد استفاده و خواص قابل تغییر
|نوع حسگر||تغییرات خواص|
|اثر میدانی(خازنها، دیودها، ترانزیستورها)||تابع کار(قطبش الکتریکی)|
|اپتیکی||پارامترهای اپتیکی(بازتاب، عبور، جذب، ضریب شکست، طول نوری)|
|کاتالیزوری||گرما یا دما|
|الکتروشیمیایی||نیروی محرکهی الکتریکی یا جریان الکتریکی در سلولهای شیمیایی حالت جامد|
یکشنبه, 26 شهریور 1396 ساعت 07:34
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3、 造成和他人的知名商品相混淆，这点尤为值得注意。预计2014年成交额仍可保持在500亿～600亿美元之间，表面覆盖着橘色的隔热材料。可有效解决目前两岸酒检仪检定效率低下、自动化程度不高等问题，许多机场项目进度将会滞后。 能够在即使停止的情况下不会倒下。并计划将智能电表现场检验科研成果世卫组织正式将“成人每天食盐摄入量应少于5克”的建议写进指南里。
یکشنبه, 26 شهریور 1396 ساعت 05:26
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مقدمهای بر حسگرهای گازی - UT-MEMS
یکشنبه, 26 شهریور 1396 ساعت 04:56
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یکشنبه, 26 شهریور 1396 ساعت 03:27
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مقدمهای بر حسگرهای گازی - UT-MEMS
یکشنبه, 26 شهریور 1396 ساعت 01:40
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یکشنبه, 26 شهریور 1396 ساعت 01:12
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یکشنبه, 26 شهریور 1396 ساعت 00:02
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یکشنبه, 26 شهریور 1396 ساعت 00:02
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شنبه, 25 شهریور 1396 ساعت 22:38
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شنبه, 25 شهریور 1396 ساعت 22:08
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