| Autor: |
Stanojevic, N., Markushev, D. K., Aleksić, S. M., Pantić, D. S., Galović, S. P., Markushev, D. D., Ordonez-Miranda, J. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 6/28/2023, Vol. 133 Issue 24, p1-12, 12p |
| Abstrakt: |
Based on the analogy between resistor–capacitor (RC) filters and the thermoelastic component of a photoacoustic signal, the complex thermoelastic response of an open photoacoustic cell is described as a simple linear time-invariant system of a low-pass RC filter. This description is done by finding a linear relation between the thermoelastic cut-off frequency and sample material thickness within the range of 10–1000 μm. Based on the theory of a composite piston, we run numerical simulations of the proposed method for n-type silicon, described as either a surface or volume absorber. Theoretical predictions are experimentally validated by using an open photoacoustic cell setup to record the signal of an 850-μm-thick n-type silicon wafer illuminated by a blue light source modulated with frequencies from 20 Hz to 20 kHz. The obtained experimental results confirm the linear dependence of the thermoelastic cut-off frequency on the sample thickness, and, therefore, they lay the foundation of a new method for the thermal characterization of materials. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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