The study of microwave nondestructive examination system for fiber glass-reinforced plastic sucker rods

When the defect existed in the glass-reinforced plastic sucker rods, some insecurity accident would happen in use of the sucker rods in the oil field. The microwave signal source with a wavelength of 8 mm has been adopted for examining it. The experimental result shows that the optimum defect reflection signal wave and penetration signal wave of fiber glass-reinforced plastic sucker rod can be obtained by adopting 36.75 GHz microwave signal. The sensitivity taper probe which is suit for examining defects of fiber glass-reinforced plastic sucker rods using microwave nondestructive examination system has been designed, in which, the width of H side is 58.1 mm, the width of E side is 17 mm, the length of axis is 138 mm, the range of frequency is between 26.5 GHz to 40 GHz. When the distance between penetrating receiving transducer and test piece is 80 ~ 140 mm, the defects can be identified exactly. Since the problem that the direction of the test piece is 90°, the glass-reinforced plastic sucker rods have been examined nondestructively in all directions by means of single signal generator and magic tee multichannel testing system technology. The microwave nondestructive examination detector has been successfully developed, which can meet the project requirement for microwave nondestructive examination system for glass-reinforced plastic sucker rods in oil fields.