A5058394681- Thermography and Photoacoustic Techniques
- Photoacoustic and Ultrasonic Imaging
- Ultrasonics and Acoustic Wave Propagation
- Calibration and Measurement Techniques
- Advanced Chemical Sensor Technologies
- Thermoelastic and Magnetoelastic Phenomena
- Thermal properties of materials
- Laser and Thermal Forming Techniques
- Heavy Metals in Plants
- Crop Yield and Soil Fertility
University of Nis
2012-2023
University of East Sarajevo
2021-2023
Vinča Institute of Nuclear Sciences
2021
In this paper, a self-consistent inverse procedure is developed for the estimation of linear thermal expansion coefficient and diffusivity solids from transmission photoacoustic measurement. This consists two single-parameter fitting processes applied alternately: phase data are fitted by shifting diffusion coefficient, while amplitude coefficient. Each process uses resulting parameter other, previously finished one, thus converging to best solution-pair achievable. numerical experiments,...
In order to make the photothermal effect detectable from a sample with low optical absorption, an optically opaque layer must be applied on its surface. A model of induced temperature variations for such structure is derived, very thin coating non-illuminated (back) side and neglecting heat flux dissipation in coating. Validation performed by comparing obtained results corresponding two-layer model. The influence absorption surface both transparent semi-transparent film, whether film good or...
This paper presents the model of surface temperature variations, resulting from photothermal effect induced in a ?thin film ? highly absorbing layer? structure, where thin is irradiated. The influence optical absorption coefficient and sample thickness on gradient analyzed. It shown that, depending product these parameters (optical absorbance) described phenomenon inverse can occur, further influencing direction magnitude thermoelastic displacement.
In this work, the influence of thermal and mechanical piston effects over frequency at which amplitudes components photoacoustic signal resulting from these two are equalized. The analysis was done in measuring range 10 to 20kHz. An aluminum sample illuminated with modulated light, whose thickness varies 1000 microns, considered. It is important for development reliable inverse procedures determination various properties samples experimental measurement.
Abstract In this work, theoretically/mathematically simulated (TMS) model is presented for the photoacoustic (PA) frequency response of a semiconductor in minimum volume PA cell. By analyzing TMS model, influences thermal diffusivity and linear coefficient expansion on silicon sample were investigated two methods developed their estimation. The first one self consistent inverse procedure (SCIP) solving exponential problems mathematical physics, based regression. second one, well trained...