Duct Characterization

Save favourite 11 Jan January 2017

The purpose of duct characterization is to predict how the duct is placed in the ground when the number of sharp bends reduce the maximum length of how long the fiber can be blown into the tube. The objective of this activity is to streamline the fiber installation and maintenance through duct characterization.

The companies has a great need to be able to characterize how the ducts are buried in the ground for future digging works. It can be done by various methods, for example by radio loop or ground radar. Both methods require manual work by following the ducts with an instrument above ground, which does not provide reliable information about individual bends and radius. To estimate blow ability now a pressure test is done that shows if the pipe leaks and blow a radio probe that might get stuck if a bend is to sharp. This method does not measure the cumulative effect of several bends in a row. By using a new type of probe there will be a better accuracy of categorization. Data from the sensors are filtered inside the probe with a microprocessor and then stored in an embedded memory. When the probe is reached the end the data is read out and processed so that an accurate as possible image of the installation is shown. Within this project a model that estimates the blow distance depending on the length and bends of the installation will be developed.

Partners: Eltel, Servanet, Fiber Optic Valley, Mittuniversitetet