The present invention relates to a sensor fixing device for a Lamb wave type non-destructive inspection system and, more specifically, relates to the sensor fixing device for the Lamb wave type non-destructive inspection system which detects cracks on an outer wall of a subject to be inserted such as a gas pipe, etc. According to the present invention, the sensor fixing device comprises: a coupling belt (110) which is a coupling member having an inner wall which encloses an outer wall of the subject to be inspected, wherein a plurality of unit spaces (120) are separately prepared by partitioning an inner space of the coupling be unit air tubes (121) which are respectively prepared for each of the unit spaces; unit cartridges (130) each of which includes a transmitter to transmit an ultrasonic wave, a receiver to receive the Lamb wave reflected by the subject to be inspected, and a transmission module transmitting the received Lamb wave to an external diagnose and analysis unit wherein each of the unit cartridges corresponds to each of the unit air tubes and is coupled with an inner side of the coupling belt respectively; air line tubes which are air paths connected to the unit air tubes respectively; an air pump which separately performs injection or discharge of air into or from the unit air tubes through the air line tubes; and a control unit which controls the air pump to adjust an air pressure in each of the unit air tubes. According to the present invention, a sensor for the Lamb wave type non-destructive inspection system is able to uniformly be attached to the outer wall of the subject to be inspected.;COPYRIGHT KIPO 2016
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