TY - JOUR
T1 - Method for measurement of the thermal diffusivity in solids
T2 - Application to metals, semiconductors, and thin materials
AU - Calderón, A.
AU - Muñoz Hernández, R. A.
AU - Tomás, S. A.
AU - Cruz-Orea, A.
AU - Sánchez Sinencio, F.
PY - 1998/12/1
Y1 - 1998/12/1
N2 - We present a method for determining the thermal diffusivity in opaque solids by means of an analysis of the photoacoustic phase signal at low modulation frequencies using the open-cell photoacoustic technique. We show for f≤(π/2)2fc, where fc is the modulation frequency at which the thermal diffusion length matches the sample thickness, the photoacoustic phase signal can be written in linear form with the modulation frequency f. Then, obtaining the proportionality coefficient by fitting the experimental data, the thermal diffusivity of the sample can be determined. The advantage of dus method is that it is realized in a range of modulation frequencies below those normally used, hence, the pbotoacoustic signal should be alone attributed to the mechanism of thermal diffusion. Moreover, the signal-to-noise ratio will be more reliable. This method was tested in some samples and it is also shown to be important in solids with high diffusivity values and thin materials.
AB - We present a method for determining the thermal diffusivity in opaque solids by means of an analysis of the photoacoustic phase signal at low modulation frequencies using the open-cell photoacoustic technique. We show for f≤(π/2)2fc, where fc is the modulation frequency at which the thermal diffusion length matches the sample thickness, the photoacoustic phase signal can be written in linear form with the modulation frequency f. Then, obtaining the proportionality coefficient by fitting the experimental data, the thermal diffusivity of the sample can be determined. The advantage of dus method is that it is realized in a range of modulation frequencies below those normally used, hence, the pbotoacoustic signal should be alone attributed to the mechanism of thermal diffusion. Moreover, the signal-to-noise ratio will be more reliable. This method was tested in some samples and it is also shown to be important in solids with high diffusivity values and thin materials.
UR - http://www.scopus.com/inward/record.url?scp=0032329526&partnerID=8YFLogxK
U2 - 10.1063/1.368957
DO - 10.1063/1.368957
M3 - Artículo
SN - 0021-8979
VL - 84
SP - 6327
EP - 6329
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 11
ER -