SELF TRACKING SENSOR SUSPENSION MECHANISM

摘要

The invention relates to a self-tracking sensor mechanism for use with a sma rt pipeline inspection gauge, commonly termed a "smart pig". The self-tracking sensor mechanism has a link pivotally attached to a body portion of the pig and a spring for using the link in a direction away from the body portion of the pig and toward the wall of the pipeline being inspected. A trailing arm is pivotally connected to the link. The trailing arm has a sensor that is maintained in contact with the pipeline interior surface to be inspected during travel of the pig through the pipeline.