FIELD: ferromagnetic alloy pipes wall thickness measuring.
SUBSTANCE: invention relates to ferromagnetic alloy pipes wall thickness measuring. The essence of the invention includes at least two transducers structurally located in one housing, one of which is an ultrasonic transducer designed as an electromagnetic-acoustic transducer and connected to the pulse current generator and the processing unit of ultrasonic signals, the second is a magnetic-induction transducer designed as a Hall sensor and connected to the processing unit of magnetic-induction signals, placed over the pipe surface, the sensors scan the pipe surface along a helical path while moving the pipe linearly and rotating it around its axis under a common applied constant magnetic field generated by a magnetic field source, the pipe wall thickness is measured at the same measuring point by means of the magnetic-induction and ultrasonic sensors, the acoustic wave signals received by the ultrasonic sensor are transmitted to the ultrasonic signal processing unit, while the magnetic field signals received by the magnetic-induction sensor are transmitted to the magnetic-induction signal processing unit, then the processing results from the ultrasonic and magnetic-induction signal processing units are transmitted to the general processing unit designed to generate the pipe wall thickness measurement resultant and continuously calibrate the measurement results from the magnetic-induction sensor to the measurement results of the ultrasonic sensor, taking into account the time shift caused by the different transit times of each measurement point by means of the ultrasonic and magnetic-induction sensors, the results of the calibrated measurement results are displayed in the form of a diagram on the display unit, if there are no measurement results from the ultrasonic sensor, the measurement results from the magnetic-induction sensor are displayed on the display unit.
EFFECT: invention provides possibility to increase the pipe wall thickness measurement accuracy.
2 cl, 4 dwg
