A technology for sewer pipe inspection (Part 2)

Experimental assessment of a new laser profiler for sewer defect detection and quantification

Journal article (2017)

Authors

M.J. Lepot Sanitary Engineering -

N. Stanic Sanitary Engineering -

F.H.L.R. Clemens Deltares, Sanitary Engineering -

Research Group

Sanitary Engineering () (TU Delft)

Bias Uncertainty Camera Prototype Laser Asset management Validation Laboratory test CCTV Linear infrastructure

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Published Date

01-01-2017

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Water Management

Research Group

Sanitary Engineering

Abstract

In order to test the laser-scanning device presented by Stanić, Lepot, Catieau, Langeveld and Clemens [1], laboratory experiments have been performed. Various objects, covering a wide range of sizes, shapes, materials, colours and reflectiveness, have been installed in a concrete pipe and scanned by the prototype in order to identify potential object characteristics that may affect measurement uncertainty and/or create bias. By taking into account both uncertainties (on scanned and measured sizes), scanned dimensions have been compared to measurements performed with a calliper or a ruler: overall the values are mutually consistent. The proposed prototype is suitable for sewer inspections: displaced joints, cracks, deposits can be accurately measured without any bias by comparison to CCTV. Uncertainty in the measurement appears to be unaffected by humidity or fat deposits.

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