نوع مقاله : علمی- ترویجی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده فیزیک، دانشگاه علم و صنعت ایران، تهران، ایران

2 دانشیار، دانشکده فناوری‌های نوین، دانشگاه علم و صنعت ایران، تهران، ایران

3 استاد، دانشکده فیزیک، دانشگاه علم و صنعت ایران، تهران، ایران

4 استادیار، دانشکده فیزیک ، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

آشکارسازی نور فرابنفش در علوم نجوم و هواشناسی به دلیل اطلاعات مفیدی که در اختیار می‌گذارد، مورد توجه قرار دارد. CCD هایی که بر پایة آشکارساز فرابنفش ساخته می‌شود، به انواع فیلترهای طول موج‌های بلندتر نیاز ندارد. در این صورت، نور فرابنفش به‌طور مستقیم آشکارسازی می‌شود و از این رو می‌توان گفت که حساسیت مؤثر این نوع CCD نسبت به نور فرابنفش بیش‌تر است. علاوه بر پارامترهای اساسی آشکارساز، مثل بازدهی کوانتومی، جریان تاریک و جریان نوری، حد تحمل در برابر تشعشعات پرانرژی، به‌خصوص برای آشکارسازهایی که جهت کاربرد در محیط فضایی مورد استفاده قرار می‌گیرد، اهمیت زیادی دارد. محیط‌های تشعشعی با تأثیر و تغییر در مشخصات مواد و قطعات تشکیل‌دهندة آشکارسازهای نوری به‌تدریج عملکرد آن‌ها را با افت کیفیت مواجه کرده و باعث عملکرد نامناسب و محدودیت‌هایی در استفاده از آشکارسازها می‌شود. در این مقاله، ابتدا انواع آشکارسازهای فرابنفش و مشخصات عمومی آن‌ها بررسی می‌شود. سپس، آشکارساز مبتنی بر نیمه‌هادی AlN معرفی و اثر تشعشعات بر پارامترهای آن بررسی می‌شود. در انتها، به مطالعة چند نوع از آشکارسازهای طیف VUV جهت استفاده در کاربردهای فضایی پرداخته می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

An Overview of Aluminum Nitride (AlN) Based VUV Detectors in Space Applications

نویسندگان [English]

  • Leyla Barghamadi 1
  • Seyd hassan Sedighy 2
  • Bijan Ghafari 3
  • Shahab Norouzian alam 4

1 M.Sc. Student, Department of Physics, Iran University of Science and Technology.Tehran.Iran

2 Associate Professor, School of Advanced Tecnologies, Iran University of Science and Technology .Tehran, Iran

3 Professor, Department of Physics, Iran University of Science and Technology, Tehran, Iran

4 Assistant Professor , Department of Physics, Iran University of Science and Technology Tehran, Iran

چکیده [English]

Ultraviolet light detection is of interest in astronomy and meteorology because of the useful information it provides. CCD's based on UV detectors do not require any longer wavelength filters.In this case, UV light can be directly detected and therefore the effective sensitivity of CCD can be effectively increased. The high radiation tolerance is a very critical factor (especially for the detectors used in outer space) in addition to other basic detector parameters, such as quantum efficiency, dark current, and optical current, Radiative environment, by changing the properties of the materials and devices that create the photodetector, can gradually deteriorate its performance and therefore causes malfunction and limitation in the application of photodetectors. In this article, we initially deal with different types of UV detectors and their general characteristics, then the AlN based photodiode and the effect of radiation on its parameters is introduced and discussed. Eventually,a  few types of VUV photo-detectors, used in space applications, will be reviewed.

کلیدواژه‌ها [English]

  • Photodetector
  • VUV
  • Space Applications
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