INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
NEW DESIGN FOR OPTICAL POROUS SILICON GAS SENSORS
Autor/es:
L.N. ACQUAROLI; R. URTEAGA; R.R. KOROPECKI
Lugar:
Valencia
Reunión:
Conferencia; 7th International conference on porous semiconductors sciene and technology; 2010
Resumen:
A
simple system for the detection of external analytes (EA) in the atmosphere
employing nanostructured porous silicon optical microcavities was design and
built. The system is based on the measurement of the transmittance changes as a
function of the incidence angle of a monochromatic laser beam. Using a matrix
formalism and effective medium theories we calculate the optimal conditions for
the system so as to obtain the best sensitivity of the sensor. In this work we
test the system with isopropyl alcohol vapor diluted in a N2 stream.
With the system proposed we were able to detect changes in the concentration of
the EA as small as 1 ppm, which is equivalent to a change in the refractive
index of 10-6. Below this value, variations in temperature become
significant and must be taken into account to obtain reliable measurements.