Model for the response of an optical sensor based on absorbance measurements to HCl

摘要: Abstract A model for the response of an HCl optical sensor based on chemical reactions which produce a change in absorbance is presented. The diffusion and kinetic processes involved sensing film. Parameters important to include coefficients concentrations different species, reaction rate constants film layer thickness. computer program developed includes all this relevant information order obtain concentration species as function time. compared with quasi-reversible experimental acidic gas sensor, usually used CO2, membrane indicator. For purpose modelling has been studied characterised by techniques experiments. reproduces very well absorbance, difference speed exposure recovery transients, quasi-reversibility reversibility dependence acid concentration. can also be applied fully reversible sensors, they are particular case quasi-reversibility, other similar sensors measurements reactions. Similar models systems optical, conductivity or mass responses considering their respective controlling response.