year 28, Issue 2 (ICOP & ICPET 2022 2022)                   ICOP & ICPET _ INPC _ ICOFS 2022, 28(2): 776-779 | Back to browse issues page

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Investigation of the effect of the pinhole size on photothermal signal and thermal diffusivity
Iman Bidarvnad *1 , Fatemeh Matroodi , Amir mohammad Ahadi
Abstract:   (1769 Views)
In this paper we investigate the effect of the pinhole size on the magnitude of the photothermal signal and the result of signal analyses to obtain the thermal diffusivity. In this experiment, in the thermal lens spectroscopy (TLS) setup, a diode laser operating at 532nm and a He-Ne laser operating at 632.8nm were used as pump and probe respectively, and they passed co-linearly through the sample. Pure ethanol (99.5%) was used as the sample. Results show that despite the direct effect of the pinhole size on the magnitude of photothermal signal, if aligned properly, it does not have a considerable effect on analyses of thermal diffusivity.
Keywords: photothermal signal, pinhole, thermal diffusivity, thermal lens spectroscopy.
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Type of Study: Experimental | Subject: Special
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