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Abstract:

A technique has been developed for the determination of the phase transition temperature of very small samples or thin films and coatings. The technique relies on the determination of changes in the heat capacity of the surface by resonant piezoelectric detection of the photoacoustic signal. The sample, is illuminated by means of a low power diode laser modulated at the resonant frequency of a piezoelectric detector. The detector senses the acoustic signal generated by the expansion of the surface that has been slightly heated (about 1K) by the laser. The signal is monitored as the sample is heated at an established rate, and the phase transition temperature is determined by the change in the amplitude and phase of the signal. As the penetration of the light in metals is very small (well below 1 μm), the technique is particularly suitable for the study of surface coatings and thin films.

Registro:

Documento: Artículo
Título:Testing stability of surfaces and coatings by resonant photoacoustic phase transition detection
Autor:Cesa, Y.; Mingolo, N.; Martínez, O.E.
Filiación:Laboratorio de Haces Dirigidos, Departamento de Fisica, Universidad de Buenos Aires, Paseo Colón 850, 1063 Buenos Aires, Argentina
Laboratorio de Electronica Cuantica, Departamento de Fisica, Universidad de Buenos Aires, Pabellon 1, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Coatings; Expansion; Heating; Natural frequencies; Phase transitions; Photoacoustic effect; Piezoelectricity; Semiconductor lasers; Specific heat; Temperature; Thin films; Piezoelectric detector; Resonant photoacoustic phase transition detection; Testing stability; Surface structure
Año:2002
Volumen:18
Número:1
Página de inicio:64
Página de fin:66
DOI: http://dx.doi.org/10.1179/026708401225001219
Título revista:Surface Engineering
Título revista abreviado:Surf Eng
ISSN:02670844
CODEN:SUENE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02670844_v18_n1_p64_Cesa

Referencias:

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Citas:

---------- APA ----------
Cesa, Y., Mingolo, N. & Martínez, O.E. (2002) . Testing stability of surfaces and coatings by resonant photoacoustic phase transition detection. Surface Engineering, 18(1), 64-66.
http://dx.doi.org/10.1179/026708401225001219
---------- CHICAGO ----------
Cesa, Y., Mingolo, N., Martínez, O.E. "Testing stability of surfaces and coatings by resonant photoacoustic phase transition detection" . Surface Engineering 18, no. 1 (2002) : 64-66.
http://dx.doi.org/10.1179/026708401225001219
---------- MLA ----------
Cesa, Y., Mingolo, N., Martínez, O.E. "Testing stability of surfaces and coatings by resonant photoacoustic phase transition detection" . Surface Engineering, vol. 18, no. 1, 2002, pp. 64-66.
http://dx.doi.org/10.1179/026708401225001219
---------- VANCOUVER ----------
Cesa, Y., Mingolo, N., Martínez, O.E. Testing stability of surfaces and coatings by resonant photoacoustic phase transition detection. Surf Eng. 2002;18(1):64-66.
http://dx.doi.org/10.1179/026708401225001219