Finding leaks in large vacuum chambers using a helium leak detector is fast, efficient, and cost-effective. The proper selection of a leak detector, the connection of the detector to the vacuum system, and the appropriate use of helium tracer gas are fundamental to a successful leak test. This content is available for download via your institution's. In 2015, TOTAL, AIR LIQUIDE, GRTgaz, ENGIE E&P International and INERIS were involved in a collaborative project called FOLD. The objective of this project was to experimentally assess the capability of an optical fibre based system to detect gaseous leaks occurring in a buried pipe. In such a case, the waves do not. That is, the refractive index is higher in the core than in the surrounding cladding. Thus, ideally, this type of dielectric. In this study, we explore the development and testing of a multimode optic-fiber-based pipe monitoring and leakage detector based on statistical and machine learning analyses of speckle patterns captured from the fiber's outlet by a defocused camera. The sensor was placed inside or over a PVC pipe.
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