Remote Infrared Thermal Sensing of Sewer Voidsby Gary J. Weil, EnTech Engineering, Inc, United States,
Abstract: The question addressed by this paper is how to detect unseen problem areas in sewer systems before they give way. At present, progressive sewer administrations may use crawl crews or television systems to inspect sewers when problems are suspected. Infrared Thermography has been found by sewer districts and independent evaluation engineering firms to be an extremely accurate method of finding sewer voids, before they cause expensive and dangerous problems. This technique uses a non-contact, remote sensing method, with the potential for surveying large areas quickly and efficiently.
Subject Headings: Thermal effects | Imaging techniques | Voids | Remote sensing | Surveying methods | Radiation | Sewer pipes
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