Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
304706 | Soil Dynamics and Earthquake Engineering | 2012 | 8 Pages |
Accelerometers are one of the most used sensors for monitoring dynamically sensitive systems either in field or in laboratory scale experiments. One of the key requirements in dynamic geo-engineering application is that these sensors should be water proof or water insensitive. Traditional accelerometers used in practice are based on piezoelectric/piezoresistive technology and are generally water sensitive. They are also one-axis (can measure one dimensional acceleration), big in size and expensive (typical minimum price is 300 USD/axis). These accelerometers are adapted in dynamic geo-engineering applications dealing with saturated soils by sealing the junction of the cables and the accelerometer by appropriate sealants. In this paper, the development of an inexpensive (circa 10 USD/axis), light weight, three-axis (can measure three dimensional accelerations) Micro Electro Mechanical Systems (MEMS) based accelerometers and their application to geo-engineering problems is presented. The sensor is based on ADXL 335 chip and can be made water proof. Performance of 3-axis MEMS accelerometer is presented along with the methodology to make it water proof.