In the present investigation, holographic interferometry was utilized for t
he first time to monitor the thickness of oxide film growth on aluminium sa
mples during the initial stage of oxidation processes in aqueous solution w
ithout any physical contact. The oxidation process of the aluminium samples
was cart icd out chemically in different sulphuric acid concentrations (0.
5-3.125%;, H2SO4) at room temperature. Also, a method of holographic interf
erometry was used to measure the thickness of oxide film on the aluminium s
amples in aqueous solutions. Along with the holographic measurement, a math
ematical model was derived in order to correlate the electrical resistance
of the aluminium samples in solutions to the thickness of the oxide Rim on
the aluminium samples which were formed due to chemical oxidation. The thic
kness of the oxide film on the aluminium samples was measured by the real-t
ime holographic interferometry. Consequently, holographic interferometry is
found to be very useful for surface finish industries especially for monit
oring the early stage of oxidation processes of metals, in which the thickn
ess of the oxide film as well as the electrical resistance of the aluminium
samples can be determined in situ. (C) 2001 Elsevier Science Ltd. Ail righ
ts reserved.