Miniature Laser Interferometric Seismometer

The threat of nuclear proliferation remains a critical issue. There is no greater indicator of the capability and intent of a nation than observation of actual detonation tests being conducted. Ground-based monitoring systems have proven to be very capable in identifying nuclear tests, and can provide somewhat precise information on the location and yield of the explosive device. However, these measurements currently require very expensive and bulky seismometers that are difficult to deploy in places where they are most needed. A high performance, compact device would enable the rapid deployment of large scale arrays, which, in turn, could be used to provide higher quality data during times of critical need. This project will develop a low-cost, small sensor that can achieve the required sensor self-noise of 0.5 ng/Hz1/2, with a total dynamic range of more than 150 dB. This will be accomplished in a form factor of approximately 1 cm3, with power consumption below 30 mW. Commercial Applications and other Benefits as described by the awardee: In addition to the nonproliferation application, these sensors should greatly enhance our understanding of the earth and provide early-warning systems for earthquakes and tsunami. These sensors also should find extensive use in oil and gas exploration. They will be 100 times smaller than any existing devices, and consume 1/10th the power, making it easy to deploy anywhere in the world.