DEVELOPMENT OF NONLINEAR HARMONIC SENSORS FOR DETECTION OF MECHANICAL DAMAGE

Crouch, Alfred E. ; Dean, Alan ; Torres, Carl ; Aron, Jeff

Southwest Research Institute (United States)

关键词: Pipelines;    Measuring Instruments;    Detection;    Design;    Harmonics;   

DOI  :  10.2172/825669
RP-ID  :  NONE
RP-ID  :  FC26-01NT41156
RP-ID  :  825669

美国|英语

来源: UNT Digital Library

【 摘 要 】

In a joint effort with Tuboscope Pipeline Services of Houston, Texas, Southwest Research Institute (SwRI) adapted its nonlinear harmonic (NLH) sensing technology for use on a new in-line inspection system (smart pig). Nonlinear harmonics, an AC magnetic method for detecting local anomalies of stress and plastic deformation, shows promise of improved characterization of mechanical damage defects such as gouged dents, even though the dents may have re-rounded. The SwRI-Tuboscope project produced a sensor design, electronic design, and sensor suspension design that are directly adaptable to a multitechnology ILI system. This report describes the NLH method, the sensor, circuit, and suspension designs, and shows results from the supporting laboratory work.