Multi-sensor system for the detection and characterization...

Details Multi-sensor system for the detection and characterization... Multi-sensor system for the detection and characterization...

2011-08-16

2011-08-16

Tang, Minh N (Department: 2858)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

C324S329000, C324S343000

Reexamination Certificate

active

07999550

ABSTRACT:
To fully characterize the inductive response of an isolated conductive object, such as buried unexploded ordinance, one needs to measure its response to stimulation by primary magnetic fields in three linearly independent (e.g., approximately orthogonal) directions. In one embodiment this is achieved by measuring the response to magnetic fields of three independent transmitters arranged to have magnetic fields that are linearly independent. According to the apparatus and methods employing the system of this invention, multiple transmitters and receivers of known relative position and orientation on a single platform are used. In a preferred embodiment, matched sets of receiver pairs connected in gradient mode are positioned adjacent to closely spaced pairs of transmitting coils, such that a minor displacement of one or both of the receiver coil pairs relative to the paired transmitting coils will not affect the detected secondary signals emitted by a buried metallic object.

REFERENCES:
patent: 6437573 (2002-08-01), Golder et al.
patent: 7466134 (2008-12-01), McCarty
Smith, et al., “Multi-transmitter multi-receiver null coupled systems . . . ,” Journal of Applied Geophysics, vol. 61, p. 227-234, (2007).
Smith, et al., “Otpimizing Receiver Configurations for Resolutions of Equivalent Dipole . . . ,” IEE Trans. on Geosci & Remote Sensing, vol. 43, No. 7, p. 1490-1498, (Jul. 2005).
Smith, et al., “Estimating Equivalent Dipole Polarizabilities for the Inductive . . . ,” IEE Trans. on Geosci & Remote Sensing, vol. 42, No. 6, p. 1208-1214, (Jun. 2004).

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