Kerry B Johnson

US Patent:

20210011098, Jan 14, 2021

Filed:

Jul 6, 2020

Appl. No.:

16/946756

Inventors:

- Cambridge MA, US
Kerry Alexander Johnson - Somerville MA, US
Carson Arthur TEALE - Cambridge MA, US
Hannah A. CLEVENSON - Cambridge MA, US
Danielle Ann Braje - Winchester MA, US
Christopher Michael MCNALLY - Cambridge MA, US
John Francis BARRY - Cambridge MA, US

International Classification:

G01R 33/26
G01R 33/24
G01N 24/10
G01N 24/12
G01R 33/32

Abstract:

A magnetometer containing a crystal sensor with solid-state defects senses the magnitude and direction of a magnetic field. The solid-state defects in the crystal sensor absorb microwave and optical energy to transition between several energy states while emitting light intensity indicative of their spin states. The magnetic field alters the spin-state transitions of the solid-state defects by amounts depending on the solid-state defects' orientations with respect to the magnetic field. The optical read out, reporting the spin state of an ensemble of solid-state defects from one particular orientation class, can be used to lock microwave signals to the resonances associated with the spin-state transitions. The frequencies of the locked microwave signals can be used to reconstruct the magnetic field vector.

US Patent:

20200025835, Jan 23, 2020

Filed:

Aug 21, 2018

Appl. No.:

16/106802

Inventors:

Linh M. Pham - Arlington MA, US
Erik M. Thompson - Waltham MA, US
John F. Barry - Cambridge MA, US
Kerry A. Johnson - Somerville MA, US
Danielle A. Braje - Winchester MA, US

International Classification:

G01R 33/00
G01R 33/26

Abstract:

Applying a bias magnetic field to a solid-state spin sensor enables vector magnetic field measurements with the solid-state spin sensor. Unfortunately, if the bias magnetic field drifts slowly, it creates noise that confounds low-frequency field measurements. Fortunately, the undesired slow drift of the magnitude of the bias magnetic field can be removed, nullified, or cancelled by reversing the direction (polarity) of the bias magnetic field at known intervals. This makes the resulting solid-state spin sensor system suitable for detecting low-frequency (mHz, for example) changes in magnetic field or other physical parameters.

US Patent:

20180136291, May 17, 2018

Filed:

Nov 8, 2017

Appl. No.:

15/807269

Inventors:

Linh M. Pham - Arlington MA, US
Kerry Alexander Johnson - Somerville MA, US
Carson Arthur Teale - Cambridge MA, US
Hannah A. Clevenson - Cambridge MA, US
Danielle Ann Braje - Winchester MA, US
Christopher Michael McNally - Cambridge MA, US
John Francis Barry - Cambridge MA, US

International Classification:

G01R 33/26

Abstract:

A magnetometer containing a crystal sensor with solid-state defects senses the magnitude and direction of a magnetic field. The solid-state defects in the crystal sensor absorb microwave and optical energy to transition between several energy states while emitting light intensity indicative of their spin states. The magnetic field alters the spin-state transitions of the solid-state defects by amounts depending on the solid-state defects' orientations with respect to the magnetic field. The optical read out, reporting the spin state of an ensemble of solid-state defects from one particular orientation class, can be used to lock microwave signals to the resonances associated with the spin-state transitions. The frequencies of the locked microwave signals can be used to reconstruct the magnetic field vector.

US Patent:

20170156632, Jun 8, 2017

Filed:

Aug 15, 2016

Appl. No.:

15/237405

Inventors:

Albert Joseph SWISTON - CAMBRIDGE MA, US
ROBERT S. LANGER - Newton MA, US
TADD BERNARD HUGHES - Andover MA, US
KERRY JOHNSON - Somerville MA, US
CARLO GIOVANNI TRAVERSO - Newton MA, US

International Classification:

A61B 5/07
A61B 7/02
A61B 5/11
A61B 5/0205
A61B 5/00

Abstract:

Reliable, real-time heart and respiratory rates are key vital signs used in evaluating the physiological status in many clinical and non-clinical settings. Measuring these vital signs generally requires superficial attachment of physically or logistically obtrusive sensors to subjects that may result in skin irritation or adversely influence subject performance. Given the broad acceptance of ingestible electronics, the approach disclosed here enables vital sign monitoring internally from the gastrointestinal tract. The large animal (porcine) experiments and a robust processing disclosed herein demonstrate the feasibility of this approach. Implementing vital sign monitoring as a stand-alone technology or in conjunction with other ingestible devices has the capacity to significantly aid telemedicine, optimize performance monitoring of athletes, military service members, and first-responders, as well as provide a facile method for rapid clinical evaluation and triage.