طراحی یک نوع طیف‌سنج اپتیکی بهینه در ناحیه طیفی UV-A

نوع مقاله : مقاله پژوهشی

نویسنده

دانشیار، دانشگاه هرمزگان، بندرعباس، ایران

چکیده

طیف‌سنج یا اسپکترومتر اپتیکی ابزاری است که برای جداسازی و تفکیک یک تابش الکترومغناطیسی به مولفه‌های طول موجی‌اش مورد استفاده قرار می‌گیرد و کاربرد متنوعی در علوم و صنایع دارد. در این مقاله یک اسپکترومتر اپتیکی منحصراً در ناحیه طیفی A UV-، که قبلاً مورد تحقیق قرار نگرفته است طراحی شده است. برای این طراحی، از توری پراش هولوگرافی با چگالی شیار 3600 خط بر میلی‌متر و تعدای عدسی با جنس‌های مختلف مناسب در ناحیه فرابنفش استفاده شده است. برای رسیدن به کنتراست و توان تفکیک بالا باید پرتوهای مربوط به هر طول موج پراشیده شده توسط توری، با دقت بالانی بر روی صفحه آشکارساز کانونی شوند. برای این منظور هشت عدسی از جنس‌های سلیکا و سلیکای ذوب شده که دارای ضریب انتقال بالایی در ناحیه فرابنفش هستند به‌کار برده شد. سپس بعد از محاسبات اولیه و تعیین تخمینی شعاع انحنای سطوح، ، جهت رسیدن به نتایج مطلوب، عدسی‌ها را به فاصله 1 میلی‌متر از هم قرارداده و با کمک عملوندهای مناسب تعریف شده در ویرایشگر تابع شایسته نرم‌افزار زیمکس، ضخامت سطوح و شعاع‌ انحنای عدسی‌ها در چند مرحله بهینه‌سازی شدند. پس از بهینه‌سازی، در طول‌موج مرکزی، تمام نقاط نمودار نقطه‌ای داخل دیسک ایری واقع شدند و توان تفکیک‌‌ سامانه تقریباً 30 پیکومتر بدست آمد که در مقایسه با کارهای قبلی محققان در سایر نواحی طیف الکترومغناطیسی، نتیجه بسیار مطلوبی است.

کلیدواژه‌ها


عنوان مقاله [English]

Design of a type of optimal optical spectrometer in the UV- A spectral region

نویسنده [English]

  • Ali Rezaei-latifi
Associate Professor, University of Hormozgan, Bandar Abbas, Iran
چکیده [English]

An optical spectrometer is a tool used to separate an electromagnetic radiation into its wavelength components and has a variety of applications in science and industry. In this paper, an optical spectrometer in the UV-A spectral region, which has not been investigated before, is designed. For this design, a holographic diffraction grating with a groove density of 3600 lines/mm and a number of lenses with different materials suitable for the ultraviolet region are used. To achieve high contrast and resolution, the beams of each wavelength scattered by the grating must be carefully focused on the detector screen. For this purpose, eight lenses made of silica and fused silica, which have a high transfer coefficient in the ultraviolet region, were used. Then, after the initial calculations and determining the estimated radius of curvature of the surfaces, in order to achieve the desired results, the lenses were placed at a distance of 1 mm from each other and by using appropriate operands defined in the merit function editor of Zemax software, the thickness of the surfaces and the radius of curvature of the lenses was optimized in several stages . After optimization, at the central wavelength, all points of the spot diagram were located inside the Airy disk and the resolution of approximately 30 pm was obtained, which is a very good result compared to the previous works of researchers in other areas of the electromagnetic spectrum.

کلیدواژه‌ها [English]

  • Spectrometer
  • Diffraction grating
  • UV-A
  • Resolution
  • Spot diagram
  • Airy disk

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دوره 11، شماره 2 - شماره پیاپی 27
شماره پیاپی 27، پاییز و زمستان
مهر 1402
صفحه 1-9
  • تاریخ دریافت: 29 اردیبهشت 1402
  • تاریخ بازنگری: 16 مرداد 1402
  • تاریخ پذیرش: 21 شهریور 1402
  • تاریخ انتشار: 16 آبان 1402