Increased Ground Vibration Measurement Speed for Landmine Detection
Abstract
The objective of this program, to demonstrate the feasibility of time-division multiplexing for rapid ground vibration measurements, has been achieved. Time-division multiplexing is a technique in which a multiple-beam laser Doppler vibrometer (MBLDV) passes over the ground while each beam measures a portion of the ground vibration. The signal from each beam is combined to determine the vibration pattern of that section of ground. In this way, the ground vibration measurement speed can be increased in a manner directly proportional to the number of beams in the down-track direction. The University of Mississippi (UM), working with MetroLaser, Inc. and Planning Systems Incorporated, adjusted a MBLDV to accommodate new broadband photodetectors, developed data acquisition and demodulation software, tested the overall measurement system using simulated motion of a vibrating target, built a test track, acquired data with a moving sensor, and tested a basic demultiplexing algorithm. Data was taken and processed to a velocity profile proving the concept of time division multiplexing with a MBLDV. The results indicate promise for this technique and a follow-on grant has been awarded to UM to expand the capabilities of the hardware and software to further this research in more realistic environments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 09, 2009
- Accession Number
- ADA514444
Entities
People
- James M. Sabatier
Organizations
- University of Mississippi