08 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
Laser-based measurement of thermophysical properties of diethyl ether and toluene with high accuracy using photo-thermal lens technique
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
thermophysical properties, diethyl ether, toluene, photo-thermal lens technique
سال
2021
مجله European Physical Journal Plus
پژوهشگران محمدرضا محبی فر

چکیده

The aim of this paper is to accurately measure the thermophysical properties of diethyl ether and toluene by photo-thermal lens set-up. The thermal lens signal of these liquids was recorded and results show that the thermal lens formation process in these materials is in the order of milliseconds, while the thermal lens relaxation process is in the order of decaseconds. The thermal diffusivity and thermal conductivity of these solvents was measured at fixed laser energy of 90 mJ and temperature of 293 K. The deviation of the measured values from the literature values was less than 4.2%, which indicates the high accuracy of this optical set-up for measuring thermo-optical properties. Then, thermo-optical coefficient (dn⁄dT) of chloroform, diethyl ether and toluene was measured -6.31×10-4, -7.0×10-4, and -5.5×10-4 K^(-1), respectively. Also, the refractive index changes with the sample deposited heat (dn⁄dQ) for these materials were measured -0.407, -0.436, and -0.384 〖mm〗^3/J, respectively.