Metal material defect detecting sensor based on pulsed eddy current and electromagnetic ultrasonic

Abstract

The invention discloses a metal material defect detecting sensor based on pulsed eddy current and electromagnetic ultrasonic and belongs to the field of nondestructive detection of metal material defects. The problem is solved that an existing metal material defect detecting mode based on pulsed eddy current and electromagnetic ultrasonic causes excessive size and weight of a corresponding sensor,is not suitable for high-temperature occasions and is poor in defect detecting effect. According to the sensor, an air core solenoid and a plate coil respectively transmit pulse signals and radio-frequency pulse signals. The air core solenoid makes a metal material to be detected produce eddy current effect, self-sensing voltage signals between two ends of the air core solenoid are the first sensing signals of the sensor after eddy current effect, the air core solenoid, the plate coil and the metal material to be detected form an electromagnetic ultrasonic transducer, the plate coil receivesultrasonic waves excited by the metal material to be detected and transmits ultrasonic waves to the metal material to be detected, and echo signals of the ultrasonic waves entering the metal materialto be detected are second sensing signals of the sensor.

Description

technical field [0001] The invention relates to a metal material defect detection sensor, which belongs to the field of nondestructive detection of metal material defects. Background technique [0002] Electromagnetic ultrasonic testing and pulsed eddy current testing are two commonly used nondestructive testing methods for metal materials. These two testing methods have their own advantages and disadvantages. [0003] The electromagnetic ultrasonic testing method is based on the principle of electromagnetic induction, and excites ultrasonic waves inside the metal material to identify internal defects of the metal material, and can also quantitatively describe the defects of wall thickness reduction. However, due to the near-surface blind area in electromagnetic ultrasonic testing, the defects in the near-surface blind area cannot be identified. Therefore, the electromagnetic ultrasonic testing method can only identify the internal defects of the metal material, but cannot ...

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Problems solved by technology

[0008] In order to solve the problems that the existing metal material defect detection method based on the combination of electromagnetic ultrasonic and pulsed eddy current causes the volume and weight of the corresponding sensor to be too large, it is not suitable for high temperature occasions and the defect detection effect is poor, and a method based on pulsed eddy current and pulsed eddy current is proposed. Electromagnetic Ultrasonic Metal Material Defect Detection Sensor

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