Dynamically self-adjusting magnetometer

• US 8,560,259 B2
• Filed: 12/06/2010
• Issued: 10/15/2013
• Est. Priority Date: 12/06/2010
• Status: Active Grant

• Current Assignee: Mis Security, LLC.
• Original Assignee: Broadband Discovery Systems, Inc.
• Inventors: Stephanson, Cory James
• Primary Examiner(s): TSAI, CAROL S W
• Application Number:
  US12/961,302
• Publication Number:
  US 20120143548A1
• Time in Patent Office: 1,044 Days
• Field of Search: 702/92, 702/85, 702/153, 702/94, 324/239, 324/240, 324/207.17, 324/247, 324/202, 324/262, 333/19, 333/55.R, 333/56, 73/14.1
• US Class Current: 702/85
• CPC Class Codes: G01R 33/0035 Calibration of single magnetic sensors, e.g. integrated calibration
• CPC Class Codes: G01R 33/028 Electrodynamic magnetometers
• CPC Class Codes: G01R 35/00 Testing or calibrating of apparatus covered by the other groups of this subclass
• CPC Class Codes: G01R 35/005 Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references G01R33/0035, G01R35/002 take precedence

Abstract

A dynamically self-adjusting magnetometer is disclosed. In one embodiment, a first sample module periodically generates an electronic signal related to at least one magnetic field characteristic of a monitored environment. A second sample module periodically generates an electronic signal related to at least one magnetic field characteristic of a monitored environment. A summing module sums the absolute value of the electronic signal from the first sample module and the electronic signal from the second sample module. A delta comparator module receives the electronic signals from each of the first sample module, the second sample module and the summing module and compares each of the electronic signals with a previously received set of electronic signals to establish a change, wherein an output is generated if the change is greater than or equal to a threshold.

Claims

1. A computer-implemented method for monitoring an environment with a dynamically adjustable magnetometer, said method comprising:

periodically generating a first channel electronic signal representing a magnetic field of a monitored environment;

periodically generating at least a second channel electronic signal representing said magnetic field of said monitored environment;

summing an absolute value of said first channel electronic signal and an absolute value of said at least a second channel electronic signal over a period to generate a total value for said period;

calculating a delta change between the total value for a first period and the total value for a second period;

generating an output if said delta change is greater than a pre-defined threshold;

utilizing the average total value for at least two of the latest periods to repeatedly generate a floating average;

calculating an average delta change between a first period floating average and a second period floating average; and

generating said output if the average delta change is greater than a pre-defined threshold.

2. The computer-implemented method of claim 1, wherein said periodically generating a first channel electronic signal is performed by a magnetic field sensor selected from the group consisting of:

a fluxgate sensor, a magneto inductive sensor, a magneto resistive sensor, a Cesium vapor, and a skinning induction-effect sensor.

3. The computer-implemented method of claim 1 further comprising:

utilizing an oscillation frequency over a period of time to periodically generate said first channel electronic signal and said second channel electronic signal.

4. The computer-implemented method of claim 1 further comprising:

converting said first channel electronic signal and at least said second channel electronic signal from an analog signal to a digital signal.

5. The computer-implemented method of claim 1 further comprising:

utilizing an average total value for more than two periods to repeatedly generate a second floating average;

calculating an average delta change between two different period second floating averages; and

generating said output if the average delta change is greater than a pre-defined threshold.

6. The computer-implemented method of claim 1 wherein the output is selected from the group consisting of:

a printout, a visual signal, an audio signal, and an output to a graphical user interface (GUI).

7. A dynamically self-adjusting magnetometer comprising:

a first sample module for periodically generating an electronic signal related to at least one magnetic field characteristic of a monitored environment;

a second sample module for periodically generating an electronic signal related to at least one magnetic field characteristic of a monitored environment;

a summing module for summing the absolute value of said electronic signal from said first sample module and said electronic signal from said second sample module over a given period;

a delta comparator module configured to receive said electronic signal from each of said first sample module, said second sample module and said summing module, compare each of said electronic signals with a previously received set of electronic signals to establish a delta change, and provide an output if the delta change is greater than or equal to a threshold; and

a window module to receive said electronic signal from said first sample module, said second sample module and said summing module, said window module configured to provide an average signal over a pre-defined period for each of said electronic signals.

8. The dynamically self-adjusting magnetometer of claim 7, wherein said delta comparator module receives said average signal from said window module and compares said average signal with at least one signal from the group consisting of, a previously received average signal and one or more of said electronic signals from a different period to establish an average change, wherein said output is generated if the change is greater than or equal to a threshold.

9. The dynamically self-adjusting magnetometer of claim 7, comprising:

at least a second window module to receive said electronic signal from said first sample module, said second sample module and said summing module and to provide a second average signal for a pre-defined number of said electronic signal periods, said second average signal having a different pre-defined number of said electronic signal periods than said first average signal.

10. The dynamically self-adjusting magnetometer of claim 7, wherein said first and said second sample module utilize a magnetic field sensor selected from the group consisting of:

a fluxgate sensor, a magneto inductive sensor and a magneto resistive sensor.

11. The dynamically self-adjusting magnetometer of claim 7, wherein the electronic signal periodically generated by said first sample module and said second sample module is based on a frequency of oscillations over a fixed period of time.

12. The dynamically self-adjusting magnetometer of claim 7, wherein the summing module receives electronic signals from three or more sample modules.

13. The dynamically self-adjusting magnetometer of claim 7, wherein said delta comparator module utilizes a matrix filter to run the electronic signals through the filter more than one time.

14. The dynamically self-adjusting magnetometer of claim 7, wherein the output is selected from the group consisting of:

a printout, a visual signal, an audio signal, and an output to a graphical user interface (GUI).

18. The non-transitory computer-usable medium of claim 10 further comprising:

utilizing an average total value for more than two periods to repeatedly generate a second floating average;

calculating an average delta change between a first period second floating average and a second different period second floating average; and

generating said output if the average delta change is greater than a pre-defined threshold.

15. Instructions on a non-transitory computer-usable medium wherein the instructions when executed cause a computer system to perform a method for monitoring an environment with a dynamically adjustable sensor, said method comprising:

periodically generating a first channel electronic signal representing a magnetic field of a monitored environment;

periodically generating a first channel average electronic signal representing an average of two or more of said periodically generated first channel electronic signals;

calculating a delta change between two of said electronic signals;

generating an output if said delta change is greater than or equal to a pre-defined threshold;

periodically generating at least a second channel electronic signal representing said magnetic field of said monitored environment;

calculating a delta change between the total value for a first period and the total value for a second different period;

summing an absolute value of said first channel electronic signal and an absolute value of said at least a second channel electronic signal for each period to generate a total value for each said period; and

generating an output if said delta change is greater than a pre-defined threshold.

16. The non-transitory computer-usable medium of claim 15 wherein said two of said electronic signals utilized when calculating said delta change are selected from the group consisting of:

a first channel electronic signal from a first period and a first channel electronic signal from a second period,

said first channel electronic signal from said first period and a first channel average electronic signal from a first period,

said first channel electronic signal from said first period and a first channel average electronic signal from a second period, and

said first channel average electronic signal from a first period and a first channel average electronic signal from a second period.

17. The non-transitory computer-usable medium of claim 15 further comprising:

utilizing the average total oscillation value for at least two periods to repeatedly generate a floating average;

calculating an average delta change between a first period floating average and a second different period floating average; and

generating said output if the average delta change is greater than a pre-defined threshold.