El Instituto Politécnico Nacional
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http://repositoriodigital.ipn.mx/handle/123456789/11196| Título : | ON THE HEATING MODULATION FREQUENCY DEPENDENCE OF THE PHOTOPYROELECTRIC SIGNAL IN EXPERIMENTS FOR LIQUID THERMAL CHARACTERIZATION |
| Palabras clave : | photopyroelectric thermal wave |
| Fecha de publicación : | 16-ene-2013 |
| Editorial : | Infrared Physics & Technology |
| Descripción : | A pyroelectric sensor can be seen as a layered system consisted on a pyroelectric
material sandwiched between two thin metal layers acting as electrical contacts for
measurements of the voltage drop that can be induced by heating. This kind of sensor
can be used as a detector of electromagnetic radiation but also for thermal
characterization of materials using the photopyroelectric technique. In this work we
perform a theoretical analysis based in the so-called thermal wave approach to show
that, when this sensor is heated periodically by the absorption of intensity modulated
light by one of the metalized surfaces, while the other metal surface is in contact with a
liquid sample, the resulting pyroelectric voltage signal amplitude enhances respecting
the one resulting from the bare sensor, for certain values of the modulation frequency.
This contradicts the intuitively expectation based in the assumption that the sample
provides a new channel for heat conduction, thereby decreasing the pyroelectric
temperature. We will show that the back and forth propagation and the superposition of
thermal waves through the metal coatings must be taken into account in order to explain
the observed behavior. The proposed model was experimentally tested for water and
glycerin samples, and using a polyvinylidene difluoride (PVDF) polymer film, with Ni-
Cu metal electrodes, as a pyroelectric sensor. Instituto Politecnico Nacional, CONACyT |
| URI : | http://www.repositoriodigital.ipn.mx/handle/123456789/11196 |
| Otros identificadores : | 10.1016/j.infrared.2011.08.006 http://hdl.handle.net/123456789/707 |
| Aparece en las colecciones: | Doctorado |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| IRPT_Marin_2011.pdf | 52.96 kB | Adobe PDF | Visualizar/Abrir |
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