Detection and detonation of improvised explosive device with magnetic fields

Patent metadata

Field	Value
Publication number	US-9683817-B1
Application number	US-201514718066-A
Country	US
Kind code	B1
Filing date	May 20, 2015
Priority date	Oct 16, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A magnetic coupling (MC) circuit is provided for detecting an obscured object. The MC circuit connects to a current measuring instrument and includes a Marx bank having a plurality of stages; a peaking circuit; and an induction loop. Each stage of the Marx bank includes a resistor-capacitor (RC) loop having a first resistor connecting to a breakdown circuit. The Marx bank connects to a fixed potential known as ground. The breakdown circuit includes a breakdown switch, a second resistor and a bank capacitor. The voltage source connects to the Marx bank. The peaking circuit includes a peaking inductor, a peaking capacitor and a peaking switch disposed in parallel. The peaking switch connects the Marx bank to the peaking capacitor. The induction loop includes an impedance inductor connecting to the peaking switch. The instrument measures a first current in absence of the object and a second current in presence of the object, and detects the object based on difference between the first and second currents.

First claim

What is claimed is:

1. A magnetic coupling (MC) circuit for detecting an obscured object, said MC circuit connecting to a current measuring instrument and comprising:
a Marx bank having a plurality of stages, each stage including a resistor-capacitor (RC) loop having a first reactance device connecting to a breakdown circuit, said Marx bank connecting to a fixed potential known as ground, said breakdown circuit including a breakdown switch, a second reactance device and a bank capacitor;
a voltage source connecting to said Marx bank;
a peaking circuit including a peaking inductor, a peaking capacitor and a peaking switch disposed in parallel, said peaking inductor and peaking capacitor constituting a peaking circuit pair, said peaking switch connecting to said Marx bank; and
an induction loop having an impedance inductor connecting to said peaking switch, wherein the instrument measures a first current in absence of the object and a second current in presence of the object, and detects the object based on difference between said first and second currents.

2. The MC circuit according to claim 1 , wherein said first and second reactance devices are first and second resistors, respectively.

3. The MC circuit according to claim 1 , wherein said first and second reactance devices are first and second inductors, respectively.

4. The MC circuit according to claim 1 , wherein said voltage supply is a pulse power supply.

5. The MC circuit according to claim 4 , wherein said Marx bank includes seven stages.

6. The MC circuit according to claim 1 , wherein said voltage supply is a continuous wave source.

7. The MC circuit according to claim 1 , wherein said peaking circuit pair is a concatenated plurality of peaking inductor and peaking capacitor pairs.

Assignees

• Camp James Thomas
• Us Navy

Inventors

• Camp James Thomas

Classifications

• H03K3/53

  by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback (H03K3/335 takes precedence) · CPC title

• F41H11/136 Primary

  Magnetic, electromagnetic, acoustic or radiation systems, e.g. ground penetrating radars or metal-detectors · CPC title

• F41H11/32

  Decoy or sacrificial vehicles; Decoy or sacrificial devices attachable to vehicles · CPC title

• H02J1/06 Primary

  Two-wire DC power distribution systems · CPC title

• G01V3/101

  by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil (measuring impedance or characteristics derived therefrom G01R27/00, e.g. quality factor G01R27/26) · CPC title