Abstract
Photoacoustic signals generated in liquids are generally described with a wave equation of forced motion for which source terms are incident photoenergy. As a concrete example, the wave equation is applied to cylindrical cells, and photoacoustic signals are analyzed as a function of light modulation frequency using the assumption that the thermal diffusion length is negligibly smaller than the radius of the incident laser beam which has a Gaussian distribution. Experimental results show a monotonic decrease with increasing frequency under 10 kHz and resonance peaks beyond the 10-kHz region. These can be explained by theoretical analysis. The monotonic decrease is caused by decreased photoenergy with increasing light modulation frequency and number of the thermoelastic wave modes in the cell. The peak at 153 kHz is a resonance of the thermoelastic wave in the cell, while the other peaks correspond to structural resonance of the entire cell body and to the electrical resonance of the piezoelectric transducer.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
