09 خرداد 1403
محمدرضا محبي فر

محمدرضا محبی فر

مرتبه علمی: دانشیار
نشانی: ملایر، کیلومتر 4 جاده اراک، دانشگاه ملایر، دانشکده علوم پایه، گروه فیزیک
تحصیلات: دکترای تخصصی / فیزیک-اپتیک
تلفن: +988132355404
دانشکده: دانشکده علوم پایه

مشخصات پژوهش

عنوان
The signal-to-noise ratio measurement in chloroform detection in the presence of krypton buffer gas by laser photoacoustic method
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Laser photoacoustic method, Signal-to-noise ratio, Krypton gas, Chloroform, Carbon dioxide laser power
سال
2019
مجله Belgorod State University Scientific Bulletin - Mathematics. Physics
پژوهشگران محمدرضا محبی فر

چکیده

The signal-to-noise ratio is a measure used in engineering and science that compares the level of a desired signal to the level of background noise. This parameter is one of the main features of the spectrometer devices. In this experimental study, a homemade photoacoustic layout used to detect chloroform vapour in the presence of krypton buffer gas. The system limit of detection for detecting chloroform was measured 475ppb at the 0.49W carbon dioxide laser power, 605Hz resonant frequency and in the presence of 1bar krypton gas. Also the system signal-to-noise ratio variations for 690 mTorr chloroform vapours in the presence of three buffer gases (krypton, N2 and He) at the various laser power and barometric pressure was measured. Results show that signal-to-noise ratio increase, when the carbon dioxide laser power increases. Also when He used as buffer gas, signal-to-noise ratio is the lowest.