On the theory of nonlinear photoacoustic signal generation during gas-microphone detection
Salikhov T.Kh.1, Madvaliev U.2, Sharifov D.M.3, Tuichiev H.Kh.4
1Tajik State National University, Dushanbe, Tajikistan
2S.U.Umarov Physical-Technical Institute of the National Academy of Sciences of Tajikistan, Dushanbe, Tajikistan
3L.N.Gumilyov Eurasian National University, Nur-Sultan, Kazakhstan
4S. Aini Tajik State Pedagogical University, Dushanbe, Tajikistan
Email: tsalikhov@mail.ru
A theory is proposed for of the generation of the first two harmonics of a nonlinear photoacoustic signal of a solids sample with an arbitrary value of thermal conductivity. For limiting cases (thermally thin and thick samples) has been obtained simple expressions for the dependence of the amplitude of the excited photoacoustic signal from the emissivity of the sample and the thermophysical parameters of the sample, gas and substrates, including their thermal coefficients. Keywords: photoacoustics, thermal nonlinearity, second harmonic.
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