PHOTO-THERMOACOUSTIC EFFECT IN FLAKY MEDIA

The aim is to perform the theoretical and experimental investigation of the photo-thermoacoustic (PTA) effect (generation of acoustic waves in gas surrounding condensated medium at absorption of amplitude-modulated or pulse optic radiation in it) in the flaky media under action of the different thermoelastic mechanisms and to develop the new methods for diagnostics of the condensated media on their base. The PTA effect in the one-chamber cell in the configuration with soft substrate and also in the proposed three-chamber cell at excitation of the signal by a radiation pulse has been investigated by a transfer function method. At experimental investigation of the PTA effect the lasers of two types - pulse CO*002 and continuous argon laser were used. The PTA problem on the conversion of the continuous radiation in the flaky medium has been solved by a matrix method. The new methods of the media diagnostics have been developed: pulse PTA method measuring the absorption coefficient of the optic radiation in the non-transparent condensated media and indirect PTA method for analysis of the air and water contamination with the solid particlesAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio