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The basic idea presented in this paper is to detect corrosive liquids by extended optical fibres sensors. Surface plasmon resonance offers the possibility to detect liquid contaminants at the surface of the optical fibre in a quantitative and even analytical way. The use of optical fibres in sensing technologies is one of the most interesting upcoming technologies. Their application is related to a number of advantages, such as the small size of the sensor, the flexibility in sensor design, the inertness concerning electro-magnetic interferences, etc.. Optical fibre sensors have a small diameter which is typically in the range of 0.2 - 0.6 mm. This frequently solves spatial problems if only limited space is available. Moreover, optical fibres can work in a range up to kilometres, enabling an extended sensing area. The detection of corrosive liquids (or at least of just liquids) is possible by surface plasmon resonance which occurs on the surface of uncladded optical fibres if an appropriate metal coating is present. The set-up is relatively easy to implement, and the system is inert to electromagnetic interferences. An optical sensor is a device converting the quantity measured to another quantity characteristic for a light wave. The sensitivity can essentially be enhanced by functional coatings. For practical monitoring applications, miniaturization is required for the light source and for the read-out unit. Furthermore, the stability of the baseline still needs be determined.