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Acoustic emissions (AE) travel differently in various media. This project focuses on studying its propagation and finding its attenuation values due to different losses that may occur through a steel pipe buried under soil using SSPL developed acoustic sensors. Also, it aims to detect weak AE signal that is specific to all types of steel and other metals similar to it which minimizes the losses (Range of study is 20-30kHz ). For acoustic impedance matching, it is proposed for design of AE sensor - Titanium Carbide/Nitride as encapsulating material, AlN (Aluminium Nitride) as sensing material and range specific low noise pre amplifier. Thermal Spraying may be used to deposit Titanium carbide/Nitride upto a few nanometers. These suggested encapsulating materials have an acoustic impedance of around 42 MRayl and packaging properties which makes them suitable for required AE sensor. But due to their high melting point and Nitrides lack of abundance they cannot be used to package using the process of moulding. Experiment to determine the acoustic emissions through steel pipe was done using PU and Epoxy packaging based Acoustic Sensors. Epoxy packaging based Acoustic Sensors generated output on heavy ringing between 20 to 30 kHz. On the other hand, PU did not yield any results because of very low acoustic impedance of 1.5MRayl. Acoustic impedance of steel is around 45 MRayl while that of epoxy is nearly 6MRayl. This can be used for prediction of landslides.
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