US 11,719,764 B2
Magnetic field monitor having automated quantitative calibration of magnetic field sensor
Cory J. Stephanson, La Selva Beach, CA (US); and Scott A. Sterling, Santa Cruz, CA (US)
Assigned to MIS SECURITY, LLC, Tallahassee, FL (US)
Filed by MIS SECURITY, LLC, Tallahassee, FL (US)
Filed on Mar. 16, 2021, as Appl. No. 17/202,995.
Application 17/202,995 is a continuation of application No. 16/408,601, filed on May 10, 2019, granted, now 10,976,381.
Prior Publication US 2021/0208213 A1, Jul. 8, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 33/00 (2006.01); G01R 33/028 (2006.01); H01F 27/28 (2006.01); H01F 17/04 (2006.01)
CPC G01R 33/0035 (2013.01) [G01R 33/028 (2013.01); H01F 17/04 (2013.01); H01F 27/2823 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A magnetic field monitor for monitoring magnetic field fluctuations occurring in an environment, comprising:
a magnetic field sensor configured to generate an electronic signal at a time period representing a magnetic field of the environment, said magnetic field sensor comprising,
a sensor transducer having a sensor bobbin and a primary coil wound thereon and including first and second ends, and a secondary, over-winding coil including first and second ends;
a sensor circuit connected to the first end of the primary coil;
a controller connected to the second end of the primary coil; and
a digitally controlled potentiometer connected to the secondary coil and operatively connected to the controller.