Title : DESIGN AND PACKAGING OF AN IRONGALLIUM (GALFENOL) NANOWIRE ACOUSTIC SENSOR FOR UNDERWATER APPLICATIONS
Department of Mechanical Engineering
About Project: In this thesis, design efforts aimed at producing this MEMS bio-inspired acoustic transducer have been detailed along with the process sequence for its fabrication. Package materials including encapsulants and filler fluids have been identified based on their acoustic performance in water by conducting several experiments to compare their impedance and attenuation characteristics and moisture absorption properties. Preliminary test results of the sensor without nanowires demonstrate the process is practical for constructing a nanowire based acoustic sensor, yielding potential benefits for SONAR applications and hearing implants.
Project Overview: One of the principle applications of acoustic sensors is SONAR (sound navigation and
ranging), which is used to determine the distance and the direction of a remote object by transmitting sound waves and collecting and interpreting the reflected waves. SONAR is primarily used for underwater applications. The frequencies used in sonar systems are typically either infrasonic or ultrasonic. To trace objects under water, it is difficult to use alternative methods like LIDAR or RADAR. This is because, in the case of LIDAR, light quickly fades in the water making it difficult to trace underwater objects. Similarly, RADAR also attenuates in the water and hence can not be used. On the other hand, sound waves travel through water at a speed of 1500 m/s, which is almost five times faster than in air and penetrates to greater depths without deterioration. This makes SONAR a widely used technique for underwater applications.
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