WIRELESS ACOUSTIC SENSOR FOR STRUCTURAL HEALTH MONITORING

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Non-destructive testing (NDT) is an interdisciplinary technology that plays a vital role in ensuring the quality and structural integrity of components and systems. The NDT is defined as the identification of the physical condition of materials/structures without affecting their intended functions . NDT technologies are essential in various industries, including petrochemical, nuclear, aerospace, construction, automotive, and defence . Several NDT methods are available based on a particular physical principle . There exist different NDT methods which are used for inspection of materials/structures such as visual testing (VT), magnetic particle testing (MPT), radiography testing (RT), liquid penetrant testing (LPT), ultrasonic testing (UT), vibration testing (VT), eddy current testing(ECT), infrared thermography testing (IRT) and acoustic emission testing (AET). These methods are further subdivided into various techniques. These methods and techniques lend themselves well to specific applications such as structural integrity assessment, online monitoring, etc. through detection and characterization of damage and defects, e.g., cracks, porosity, inclusions [10-11]. Judicious selection of methods and techniques is an essential part according to the area of applications. S tr u c tur al h ea lth mo ni to ri n g (SHM) is adopted to assess the healthiness/condition of structures through their monitoring and any damage sensing before failure. SHM is vital for monitoring the health of any structure to ensure the safety of working personnel and has economic implications [15]. SHM is a new concept in the field of engineering. It is intended for continuous monitoring of structures in real-time. It also evaluates the structural performance under various external stimulus to identify damage or deterioration, in order to ensure the healthiness of the structures/components. Towards the advancement in SHM, many non-destructive testing methods have been developed over the past three decades. ¿¿The structural health monitoring on a continuous real-time basis is essential for manufacturing, end-users and maintenance teams. SHM system allows optimal use of the structure, avoidance of catastrophic failure and a minimized downtime. The SHM system, once correctly implemented, shows improvement in a product and drastically changes maintenance service. The drastic changes in maintenance philosophy are described in several publications, particularly for civil infrastructure , military air vehicle , army systems and civil aircraft