Enhancement of Laser Multi-Beam Differential Interferometric Sensor and Seismic Vibration Response of Targets
Abstract
U.S. Marine expeditionary forces engage in a wide spectrum of warfare, including asymmetric and irregular warfare and distributed operations. These operations face dangers and delays from mines and IEDs buried and hidden on and off route. Rapid, standoff, wide-area mine and IED detection capability is required to detect these explosive hazards, so that they can be avoided or cleared to allow safe passage of personnel, equipment, and supplies, and maintain operational tempo. Acoustic/seismic technology refers to methods that interrogate the soil using mechanical waves. When the source of ground excitation is airborne sound, the method is referred to as acoustic. When the ground vibration is produced by direct impact with the ground, the method is referred to as seismic. Acoustic technology developed at the National Center for Physical Acoustics has been proven as a reliable method, with a high probability of detection and low false alarm rate. Seismic methods have not been as extensively developed due to limitations in fabricating reliable seismic sources. Studies of the response of buried IED~s and landmines using a seismic source are lacking.Keys to successful implementation of either acoustic or seismic technology include rapidscanning, standoff methods for ground vibration measurement over wide areas, and the adaptation of this technology for operation from a manned or unmanned ground vehicle. The University of Mississippi, National Center for Physical Acoustics (NCPA) under grants #N000141310868 and N000141512660 from Office of Naval Research (ONR) and under contract with NSWC PCD #N00178-04-D-4143-HR20 (TI008) developed a novel Laser Multi- Beam Differential Interferometric Sensor (LMBDIS) for stand-off measurement of vibration fields. The LMBDIS has low sensitivity to the platform motion, while maintaining high sensitivity to the object vibration. A high frequency wheel station (HFWS), a mechanical ~seismic~ shaker, has also been developed by the US Navy to be used in IED and landminedetection from a moving platform. The objective of the proposed effort is to enhance the brassboard prototype of LMBDIS in order to use it together with HFWS for data collection under field conditions. The proposed project will be accomplished by completing the tasks for optimizing optomechanical and electronic design of LMBDIS, optimizing algorithms for LMBDIS signal processing, and testing the modified system in laboratory and in field. Completion of these tasks will reduce sensitivity of LMBDIS to vibration and acoustic noise, increase the speed of detection and allow acousticdetection of buried objects from a moving platform in a forward looking configuration. Furthermore, the response of buried targets to seismic excitation will be investigated to allow for optimum extraction of target signatures. The seismic wave fields around targets will be measured as a function of excitation frequency, depth of burial, and range.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 03, 2017
- Source ID
- N000141712332
Entities
People
- Vyacheslav Aranchuk
Organizations
- Office of Naval Research
- United States Navy
- University of Mississippi