Soil-Properties Measurement System: Schiebel, PC and National Instruments PXI Hardware

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Authors
  1. Toews, J.D.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN)
Abstract
Metal detectors are a primary instrument used for locating buried land mines. The Schiebel Model AN19/2 and others have been used widely around the world for both military and humanitarian demining but are adversely affected by some soils. A study is underway to investigate the causes and it was determined to use this detector to acquire data for analysis and to support modeling efforts. Modifications were made to the detector electronics making it suitable as a measurement sensor. A commercial data acquisition system was assembled and used to provide programmable timing for the transmitter pulse width and repetition rate. First 16 bit and later 12 bit A-D converters were used to digitize the transmitter current and receiver waveforms. The data collected included that of response vs. distance from the sensor head for a 2.54 cm diameter aluminum sphere target in air; response vs. distance of the sensor head above Cambodian soil; and response vs. target depth while the sensor head is resting on Cambodian soil. The faster 12 bit ADCs are capable of adequately capturing the shapes of the transmitter and receiver waveforms. The magnitude of the target signal at 20 cm is similar to the effect of the soil when the sensor head is between 10 and 15 cm from the soil. With the sensor head on the soil, the target provides very little signal at 20 cm depth. Further work is anticipated to model the detector and soils.

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Keywords
Landmine Detection;Demining;Pulse Indication;Time-Domain;Electromagnetic Induction Measurement;Measurement System;Metal Detector
Report Number
DRDC-SUFFIELD-TM-2006-142 — Technical Memorandum
Date of publication
01 Oct 2006
Number of Pages
64
DSTKIM No
CA028264
CANDIS No
526384
Format(s):
CD ROM

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