Unpowered railgun field validation for safe-arm fuzing

Patent metadata

Field	Value
Publication number	US-9915511-B1
Application number	US-201615089686-A
Country	US
Kind code	B1
Filing date	Apr 4, 2016
Priority date	Apr 4, 2016
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

Embodiments are directed to unpowered railgun field validation for safe-arm fuzing. Embodiments use a wire coil having an induced electromotive force voltage. At least one positive duration circuit measures the positive portion of the induced voltage. At least one positive peak duration circuit measures the peak value of the positive portion of the induced voltage. At least one negative duration circuit measures the duration value of the negative portion of the induced voltage. At least one negative peak detector circuit measures the peak value of the negative portion of the induced voltage.

First claim

What is claimed is:

1. A magnetic field validation circuit for a safe-arm device, comprising:
a wire coil having a first end and a second end, said wire coil having an induced EMF voltage;
a first electronic circuit electrically-connected with said wire coil, said first electronic circuit is a positive duration circuit configured to measure the duration value of the positive portion of the induced voltage;
a second electronic circuit electrically-connected with said wire coil, said second electronic circuit is a positive peak duration circuit configured to measure the peak value of the positive portion of the induced voltage;
a third electronic circuit electrically-connected with said wire coil, said third electronic circuit is a negative duration circuit configured to measure the duration value of the negative portion of the induced voltage;
a fourth electronic circuit electrically-connected with said wire coil, said fourth electronic circuit is a negative peak detector circuit configured to measure the peak value of the negative portion of the induced voltage; and
a complex logic device electrically-connected to each of said first electronic circuit, said second electronic circuit, said third electronic circuit, and said fourth electronic circuit.

2. The magnetic field validation circuit according to claim 1 , wherein said first electronic circuit, comprising:
a first positive duration resistor electrically-connected in series to a first positive duration diode;
a positive duration current mirror electrically-connected in series to said first positive duration diode;
a positive duration zener diode electrically-connected in parallel with said positive duration current mirror, said positive duration zener diode configured to maintain a 5 V DC current source to said positive duration current mirror;
a second positive duration resistor electrically-connected in series to said positive duration current mirror;
a second positive duration diode electrically-connected in parallel with said positive duration current mirror;
a positive duration capacitor electrically-connected in series to said second positive duration diode;
wherein said positive duration capacitor is electrically-connected in parallel with said second positive duration resistor, said second positive duration resistor is configured to provide a fixed current to said positive duration capacitor; and
a third positive duration resistor electrically-connected in parallel with said positive duration capacitor.

3. The magnetic field validation circuit according to claim 2 , wherein said first positive duration resistor is about 500 ohms, said second positive duration resistor is about 2 kiliohms, said third positive duration resistor is about 10 megaohms, and said positive duration capacitor is about 0.047 microfarads.

4. The magnetic field validation circuit according to claim 1 , wherein said second electronic circuit, comprising:
a positive peak duration diode electrically-connected in series to a positive peak detector capacitor; and
a positive peak detector resistor electrically-connected in parallel with said positive peak detector capacitor.

5. The magnetic field validation circuit according to claim 4 , wherein said positive peak detector capacitor is about 1 microfarads and said positive peak detector resistor is about 333 kiliohms.

6. The magnetic field validation circuit according to claim 1 , wherein said third electronic circuit, comprising:
a first negative duration resistor electrically-connected in series to a negative duration current mirror;
a negative duration zener diode electrically-connected in parallel with said first negative duration resistor, wherein said negative duration zener diode configured to maintain a 5V DC current source to said negative duration current mirror;
a second negative duration resistor electrically-connected in parallel with said first negative duration resistor;
a negative duration capacitor electrically-connected in parallel with said second negative duration resistor, said first negative duration resistor configured to supply a fixed current to said negative duration capacitor;
a first negative duration diode having a first end and a second end, said first end electrically-connected in series to said parallel connection of said negative duration capacitor and said second negative duration resistor, wherein said second end electrically connected in series with said negative duration current mirror;
wherein said negative duration current mirror having an output electrically-connected to a second negative duration diode, said second negative duration diode electrically connected in series to a third negative duration resistor.

7. The magnetic field validation circuit according to claim 6 , wherein said first negative duration resistor is about 1736 ohms, said second negative duration resistor is about 10 megaohms, said third negative duration resistor is about 512 ohms, and said negative duration capacitor is about 11 microfarads.

8. The magnetic field validation circuit according to claim 1 , said fourth electronic circuit, comprising:
a negative peak detector resistor electrically-connected in parallel with a negative peak detector capacitor; and
a negative peak detector diode electrically-connected in series to said parallel connection of said negative peak detector resistor and said negative peak detector capacitor.

9. The magnetic field validation circuit according to claim 8 , wherein said negative peak detector resistor is about 10 megaohms and said negative peak detector capacitor is about 1 microfarad.

10. The magnetic field validation circuit according to claim 1 , wherein said complex logic device is configured to measure voltages in each of said first, second, third, and fourth electronic circuits.

11. A magnetic field validation tool for safe-arm fuzing, comprising:
a wire coil having a first end and a second end, said wire coil having an induced EMF voltage;
an analog processing system electrically-connected to said wire coil; and
a complex logic device electrically-connected to said analog processing system.

12. The tool according to claim 11 , said analog processing system, further comprising:
a first electronic circuit electrically-connected with said wire coil, said first electronic circuit is a positive duration circuit configured to measure the duration value of the positive portion of the induced voltage;
a second electronic circuit electrically-connected with said wire coil, said second electronic circuit is a positive peak duration circuit configured to measure the peak value of the positive portion of the induced voltage;
a third electronic circuit electrically-connected with said wire coil, said third electronic circuit is a negative duration circuit configured to measure the duration value of the negative portion of the induced voltage;
a fourth electronic circuit electrically-connected with said wire coil, said fourth electronic circuit is a negative peak detector circuit configured to measure the peak value of the negative portion of the induced voltage.

13. The tool according to claim 12 , wherein said first electronic circuit, comprising:
a first positive duration resistor electrically-connected in series to a first positive duration diode;
a positive duration current mirror electrically-connected in series to said first positive duration diode;
a positive duration zener diode electrically-connected in parallel with said positive duration current mirror, said positive duration zener diode configured to maintain a 5 V DC current source to said positive duration current mirror;
a secon

Assignees

• Us Navy

Inventors

• Haddon Michael D

Classifications

• F42C21/00 Primary

  Checking fuzes; Testing fuzes · CPC title

• G01N27/90

  using eddy currents · CPC title

• G01N27/9026

  by moving the material · CPC title

• G01N27/82

  for investigating the presence of flaws · CPC title

• G01N27/83

  by investigating stray magnetic fields · CPC title