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EVALUATION OF A PREASURE SENSOR FOR A TSUNAMI WARNING SYSTEM

INTRODUCTION

The goal of this project is to develop a low-cost tsunami warning system for use in impoverished regions where tsunamis pose a threat. This paper details the design process of a pressure sensor used for tsunami detection. We begin by first considering the desired sensor parameter and range of depth in which the experiment will be conducted. The signal conditioning circuit is incorporated following the pressure sensor selection. The concept of the experiment used to collect and analyze the data necessary for tsunami prediction is presented in detail. Paper provides a discussion of the possible modification and improvements to the finalized pressure sensor model as a platform for future applications of this work. Finally, conclusion provides the overview of the pressure sensor design and gives insight for the continuation of this project for the next semester.

PRESSURE SENSOR SELECTION

Sensor Parameters

The desired sensor parameters for a pressure sensor in a tsunami warning system are repeatability and linearity. Repeatability refers to the closeness of agreement among a number of consecutive measurements of the same variable. Repeatability serves to reduce the possibility of a tsunami warning being a false alarm. Linearity is a measure of how well the transducer output increase linearly with increasing pressure. Linearity eliminates the need for a complicated set of algorithms to calculate the dynamic pressure from the pressure recorded by the sensor.

Pressure range

In order to pick the right sensor, it was first necessary to calculate the range of pressures the sensor will be deployed in. The initial bench test was done in a still water tank with a depth of 3 feet. The calculation of the pressure range was as follows:  kg  m P = ρgh = 1000  9.81 2 (0.9144m ) = 8.96 x103 Pa = 1.30 psi  m  s  At 3 feet (0.9144m) of water, the pressure is 1.30psi. Given this pressure range, we sourced for a pressure sensor available in our laboratory that was functional over a similar range. A strain gage pressure sensor with a range of 0 – 13psi fit our needs best. This pressure sensor which requires a supply of 13 – 28VDC is internally conditioned to give an output range of 0 – 10 VDC.

Fig.2.1: Photo of Pressure Sensor.

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Song, C. S., & Avramov-Zamurovic, S. (2008, June), Evaluation Of A Preasure Sensor For A Tsunami Warning System Paper presented at 2008 Annual Conference & Exposition, Pittsburgh, Pennsylvania. 10.18260/1-2--4072