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Magnetic Inspection of Reinforcing Steel Rods in Prestressed Concrete

Abstract: 

A method of inspecting the reinforcing members in prestressed concrete beams by generating a magnetic field close to the beam and measuring the field by means of a Hall effect sensor located between the pole pieces of the magnet. A partial or total break in a reinforcing member produces an anomaly in the magnetic field, which in turn registers as a voltage "spike" in the output of the Hall effect sensor. The method further includes a method for enhancing the data by substantially reducing or eliminating the effects of transverse reinforcing steel or support members located at the site of a break in the prestressed member.

Patent Number: 
4,573,013
Date Of Issue: 
02/25/1986
Inventors: 

Felix N. Kusenberger;John R. Barton;George A. Ferguson