Abstract
Photoacoustic (PA) is an infrequent form of spectroscopy where electromagnetic light waves directly interact with the molecules and an acoustic wave is produced. The absorbed energy is measured by detecting the pressure fluctuations in enclosed air volume. For this experiment, we have fabricated a PA cell and executed parametric studies for maximum sensitivity of its performance. The optimum inert cavity volume is found to be 84.3 × 10−7 m3 for maximum signal. Also, we have designed a pre-amplifier circuit and optimized it for desired frequency response by changing its basic components. Whole setup of the spectrosmeter was optimized using lamp carbon black as a reference sample. Finally, we have measured the thermal diffusivity of Yttrium oxide using PA spectroscopy and it is found to be 6.52 × 10−6 m2/s.
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