ELECTRONIC FILE CHARACTERISTICS: 25 files; MS Word (.DOC), MS PowerPoint (.PPT), and MS Excel (.XLS). PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 5.34 MB. SYSTEMS DETAIL NOTE: IBM-clone PC-compatible. ABSTRACT: The DoD has many contaminated sites containing both refined petroleum hydrocarbons and chlorinated solvents. Bioventing is a technology of choice for remediation of sites contaminated with residual fuel, and soil venting has been used to recover ...
We present a novel technique for effective detection and location of impacts in metals and graphite/epoxy composite laminates. This scheme employs the highly sensitive extrinsic Fabry-Perot interferometric (EFPI) optical fiber-based sensing system for recording the differential arrival times of impact-generated acoustic signals using a set of four sensors whose location is predetermined. The sensors are surface-mounted on an aluminum sample and completely embedded in the composite specimen. A mathematical model ...
The major goal of this preliminary research has been to demonstrate the survivability of sapphire optical sensor fibers embedded in Nicalon sample. The future goal of this research is to embed similar optical fiber sensors to both monitor fabrication and subsequent material performance. (Author).
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