The development of a portable steel reinforcing bar detection device for concrete bridge decks - second quarterly report

During the last quarter a variety of steel reinforcing bar (rebar) detection schemes were studied so that an optimum sensing device could be selected. It was found that magnetic techniques were superior to infrared, acoustical, and other alternative approaches. Work has begun on a magnetic sensor to meet the specifications of the study. In the course of this quarter a particular magnetic sensor was selected, designed, constructed, tested , and calibrated. Sections II through VI report the theory, operation , and performance of the sensor. Work is now ready to begin on the construction of a prototype instrument. Preliminary design considerations have been made and summarized in Sect ion VI .Second Quarterly ReportN