The optical technology developed by the Spanish University Carlos III of Madrid is related with carrying out measurements on liquid tanks. It allows detecting the liquid level using light, in an intrinsically safe way, without the risk of explosion of the electronic type techniques. We are looking for the collaboration of companies devoted to the development of instrumentation systems, specifically instrumentation for the storage and distribution of flammable liquids, fuel tanks manufacturers, as well as instrumentation for aircrafts and vehicles.Contrato Programa de Comercialización e Internacionalización. Sistema Regional de Investigación Científica e Innovación Tecnológica. (Comunidad de Madrid; Universidad Carlos III de Madrid