Holographic interferometry-based methods represent an interesting innovation for monitoring electrochemical corrosion processes. One of these techniques based on a Michelson interferometric configuration allows quantitative and qualitative obtaining of information related to corrosion, being based on simple inspection of intensity patterns with no direct physical contact with sample during reaction time, and physical preservation practically guaranteed. In this work the performance of Michelson interferometry for investigation of such phenomena on uncovered, partial and totally covered copper metallic samples is presented and experimental results suggest important information gathered about the type and mechanism of corrosion taking place.
In this work a surface roughness measurement performed by Hurst exponent determination, calculated at the same
time from data processing of an optical reflected signal is presented. An industrial plate roller rod covered with a
polymeric coating is illuminated using a laser source. A lens is used for casting the scattered light reflected from several
sectors of the plate roller, and also to focus it into a power meter connected to a computer where corresponding data
series are stored. Information related to specific points of the considered object is contained into the optical reflected
signal and post-processing of related data signal series allows calculation of the Hurst exponent, also known as
roughness exponent. A wear analysis on considered surface sectors of the roller is performed and as a result a relation
between Hurst exponent and the coating thickness for each surface sector is clearly established. The simplicity of the
opto-mechanical setup among other evident advantages may suggest the application of this non-destructive technique on
It has been recently shown that application of Michelson interferometry, is suitable for monitoring of oxide layers
growing in metallic structures during preliminary states of oxidation processes in aqueous solutions, without any
physical contact with the sample. The qualitative and quantitative interpretation of the observed interferograms allows
evaluation of important physical parameters related to specific corrosion processes . Although the using of aluminum
samples with surfaces polished to certain optical quality is a necessary requirement to obtain well-built interferograms, it
complicates further applications for diffused surfaces typical of industrial conditions. In this work we present preliminary
qualitative results obtained by using a simple experimental setup based on Digital Speckle Pattern Interferometry (DSPI)
, as a proposal to solve this difficulty and on the other hand, to use the benefits of certain powerful tools like low-coherence
optical techniques for further applications on monitoring of corrosion through turbid media.
This work presents how performance of a simple Michelson interferometric configuration, allows monitoring of oxide layers growing in aluminium structures during preliminary states of oxidation processes in aqueous solutions, without any physical contact with the sample. The alternative experimental arrangement introduce a more simple alignment compared with preliminary proposals, and the obtained interferograms offer a qualitative and quantitative interpretation of important physical parameters related to specified corrosion processes. Finally, a potential improvement in order to obtain monitoring of samples through turbid solutions is discussed.