Magnetostrictive guided-wave sensor for detection in heat exchange tube and detection method thereof

Abstract

The invention discloses a magnetostrictive guided-wave sensor for the detection in a heat exchange tube and a detection method thereof. The sensor comprises a shell, an end cover fixed with one end of the shell, a conductive steel brush connected with the other side of the shell, an inner shell which is arranged in the shell and connected with the shell, an aerial socket which is arranged on the end cover and electronically connected with the conductive steel brush through direct current leads of the inner shell, a first magnetic concentrator and a second magnetic concentrator which are respectively arranged at different positions of the inner shell, and a first alternating current coil and a second alternating current coil which are respectively winded along the first magnetic concentrator and the second magnetic concentrator and are respectively electronically connected with the aerial socket. According to the invention, the whole detection process is realized by magnetic field, belonging a non-contact detection, thus the requirement of the surface conditions in the heat exchange tube to be detected is low, polishing and other special treatment are not needed, and the detection efficiency and applicability are raised.

Description

technical field [0001] The invention relates to the technical field of ultrasonic non-destructive testing, in particular to a magnetostrictive guided wave sensor used for detection inside a heat exchange tube and a detection method thereof. Background technique [0002] With the rapid development of the petrochemical industry, the number of heat exchangers used has increased dramatically, and the number of heat exchange tubes has increased geometrically. Since the heat exchange tube is prone to failure under the interaction of corrosion and stress for a long time, it will affect the safe operation of the equipment and product quality, so it is necessary to test the heat exchange tube. At present, the detection methods for in-service heat exchange tubes mainly include far-field eddy current detection, local magnetic saturation eddy current detection, internal rotation ultrasonic phased array detection and magnetic flux leakage detection. In the detection process of the above...

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Problems solved by technology

Therefore, this method requires good contact with the inner surface and high cleaning requirements; and for the uneven inner surface, special treatment such as grinding is required, which causes inconvenience in actual operation

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