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In this paper, we discuss the current status of the development of an elastic wave analyzer for icy sub-surface (EWAIS). We begin with an introductory overview of the necessity to develop an active elastic wave transmitter that will enable reaching distances of kilometer thru ice. It is being developed to be driven by piezoelectric transducers with a bouncing constrained mass that impacts a transmission head. The EWAIS transmits the waves at two distinct frequencies; the primary frequency of the actuator at ~10 kHz for high resolution, and the secondary converted low frequency (LF) in the range of 100 to 500 Hz for long distance transmission. The sonar equation was used for the estimation of required source level, and an impact force sensor is used for the performance measurement of EWAIS prototype.
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Hyeong Jae Lee, Yoseph Bar-Cohen, Mircea Badescu, Stewart Sherrit, Xiaoqi Bao, Maikel Heness, "Elastic wave analyzer for icy sub-surfaces (EWAIS) in water-bearing worlds," Proc. SPIE 11381, Health Monitoring of Structural and Biological Systems XIV, 1138106 (22 April 2020); https://doi.org/10.1117/12.2557084