The Johns Hopkins University

Bliss G Carkhuff

Rengaswamy Srinivasan

Russell P Cain

Joseph L Abita

Jack C Roberts

Terry E Phillips

O Manuel Uy

James B Mitchell

Morris L London

Robert E Ball, Sr

Nathaniel J Hundley

Paul Arthur Bottomley

Ergin Atalar

George M Murray

Paul J Biermann

Harry K Charles, Jr

Kenneth R Grossman

Robert Osiander

Craig B Leese

Hassan M Saffarian

Andrew C Merkle

Francis B Weiskopf, Jr

Paul R Zarriello

Jeremy D Walker

Jacek L Mostwin

Andrew M Lennon

Ian D Wing

Lakshminarayan Srinivasan

Regaswamy Srinivasan

Andrew C Baisden

Michael Kleinberger

Roddy Frankel

Jeffrey C Lestio

Ronald L Stanford

Subhas Chalasani

Michael H Butler

Francis Weiskopf

John M Bacon

Oscar M Uy

Jane W Spicer

Michael L Butler

A battery cell evaluation apparatus is provided that includes a current source configured to output a current at a frequency, measurement circuitry, and control circuitry. The control circuitry may be configured to electrically connect a cell of a battery to the current source and the measurement circuitry to apply the current across terminals of the cell and receive a measurement of an impedance phase shift of the cell as phase shift data from the measurement circuitry. The control circuitry may also be configured to compare the phase shift data to a protection profile, and trigger a protection device to prevent damage to the battery based on the comparison of the phase shift data to the protection profile.

Battery cell protection system

An example battery cell diagnostic apparatus is provided that may include control circuitry, a current source, measurement circuitry, and a first and a second multiplexer. The control circuitry may be configured to control the first multiplexer to electrically connect the measurement circuitry to a battery cell and control the second multiplexer to electrically connect the current source to the battery cell to apply a current, output from the current source, at each of a set of frequencies to the battery cell. The control circuitry may also be configured to receive measurements from the measurement circuitry at each of the frequencies, which may include respective frequencies that correlate to an electrolytic resistance of the battery cell, an anode impedance of the battery cell, and a cathode impedance of the battery cell. Similar measurements may also be taken for each cell in a battery.

Battery cell evaluation system

A method is provided. The method is executable by a processor of a battery management system. The method includes sending a first command signal to a multiplexer to cause the multiplexer to select a cell of a battery. The method also includes sending a second command signal to a current source to apply a current to the cell of the battery. The method also includes receiving measurement information based on the application of the current to the cell from a measurement circuit.

Battery internal temperature sensing battery management system

A battery charging monitor is provided including a non-invasive sensor electrically connected to at least one battery cell of at least one battery, which is configured to measure an internal temperature of the at least one battery cell. The non-invasive internal temperature sensor is connected to the microcontroller that is configured to determine a rate of change of the internal temperature of the at least one battery cell based on the internal temperature of the at least one battery cell, determine a state of charge of the at least one battery cell based on the rate of change of the internal temperature, and cause a charging rate to be applied, by a battery charger, to the at least one battery cell based on the determined state of charge.

Capacity independent fast charging of batteries

A battery charging system includes a charging source, at least one battery cell, a battery internal temperature sensor configured to measure an internal temperature of the at least one battery cell responsive to charging of the at least one battery cell by the charging source, and a charge controller. The charge controller is configured to receive indications of the internal temperature of the at least one battery cell over time, to identify an indication that the at least one battery cell is at a point of full charge based on rate of change of the internal temperature, and to interrupt power delivery from the charging source to the at least one battery cell responsive to the indication that the at least one battery cell is at the point of full charge.

Control apparatus and method for conducting fast battery charge

Methods and systems to determine an internal temperature of a rechargeable lithium-ion cell based on a phase shift of the cell. Internal cell temperature may be determined with respect to an internal anode temperature and/or an internal cathode temperature. Internal anode temperature may be determined based on a phase shift of a frequency within a range of approximately 40 Hertz (Hz) to 500 Hz. Internal cathode temperature may be determined based on a phase shift of a frequency of up to approximately 30 Hz. A temperature sensor as disclosed herein may be powered by a monitored cell with relatively little impact on cell charge, may be electrically coupled to cell but housed physically separate from the cell, and/or may monitor multiple cells in a multiplex fashion. A rate of change in phase shift may be used to initiate pre-emptive action, without determining corresponding temperatures.

Battery phase meter to determine internal temperatures of lithium-ion rechargeable cells under charge and discharge

An amplifier for use in a buoyant cable antenna operable to receive signals within a frequency band includes: a first amplifier operable to provide amplified signals based on the received signals; a bandpass filter arranged to pass filtered signals within a first portion of the frequency band, the filtered signals being based on the amplified signals; an attenuator arranged in parallel with said bandpass filter and operable to attenuate signals within a second portion of the frequency band, the attenuated signals being based on the amplified signals; and a second amplifier operable to provide an amplified output including first amplified signals within the first portion of the frequency band and to provide second amplified signals within the second portion of the frequency band. The first amplified signals have a first gain, the second amplified signals have a second gain, and the first gain is more than the second gain.

Amplifier for buoyant cable antenna

A human surrogate head model (HSHM) to measure brain/skull displacement due to a physical force, such as due to an explosive, ballistic, or automotive crash type of event. A HSHM may include a plurality of magnetic field generators positioned stationary relative to a HSHM skull, each to generate a magnetic field oriented with respect to a corresponding one of multiple directions. The HSHM may include one or more electromagnetic force (EMF)-based displacement sensors, each of which may include three inductive coils oriented orthogonally with respect to one another and co-aligned about a central point. A signal processor may be implemented to separate signals generated by each coil of each EMF-based displacement sensor into a plurality of component magnitudes, each attributable to a corresponding one of the magnetic fields. A computer-implemented model may be implemented to correlate between the component magnitudes and a corresponding position and orientation of the displacement sensor.

Methods and systems to implement a surrogate head model and directly measure brain/skull relative displacement

An aspect of the present invention is drawn to method of determining a location of a submersible vehicle. The method includes obtaining first bearing information based on a location of a ship at a first time relative to the submersible vehicle and receiving broadcast information from the ship, wherein the broadcast information includes location information related to a second location of the ship at a second time, a velocity of the ship at the second time and a course of the ship at the second time. The method further includes obtaining second bearing information based on the second location of the ship at the second time relative to the submersible vehicle, obtaining a velocity of the submersible vehicle at the second time and obtaining a course of the submersible vehicle at the second time. The method still further includes determining the location of the submersible vehicle based on the first bearing information, the second location of the ship at the second time, the velocity of the ship at the second time, the course of the ship at the second time, the second bearing information, the velocity of the submersible vehicle at the second time and the course of the submersible vehicle at the second time.

System and method for determining location of submerged submersible vehicle

A battery health monitor (BHM) that operates as a battery-mountable full-spectrum alternating current (ac) impedance meter that facilitates monitoring a state-of-charge and a state-of-health of a battery. The BHM is used for monitoring one or more electrical parameters, e.g., impedance, of a battery. The BHM includes: a current sink coupled to the first terminal and configured to sink therefrom an oscillatory current so as to cause the battery to produce at a first terminal thereof an oscillatory voltage equal to or less than a dc operating voltage of the battery that would be present at the first terminal in the absence of the oscillatory current; and a voltage sensor configured to sense the oscillatory voltage at the first terminal.

Battery health monitor

An apparatus for monitoring a temperature of a structure, comprising: one or more electrically conductive loops adapted to be affixed to the structure, each including first and second elongate connection strips each made of a first metal composition having a first melting point, and a temperature sensitive band connected between the first and second connection strips and made of a second metal composition having a second melting point less than the first melting point. The apparatus further comprises a monitor, connected to respective ends of the first and second connection strips spaced-apart from the temperature sensitive band, configured to detect an open-circuit in the one or more electrically conductive loops caused when the temperature sensitive band separates from either of the connection strips.

Method and apparatus for monitoring for failure temperatures of a structure

Techniques are provided for measuring chloride ion concentration in a medium. The techniques allow measurements to be made in dry or alkaline media, or both. For alkaline conditions, a sensor includes a pair of electrodes and a polymer film imprinted for uptake of chloride ions under alkaline conditions. The film is deposited to be in contact with at least one electrode and the medium. For dry conditions, a sensor includes a pair of electrodes and a conductive polymer film imprinted for uptake of chloride ions. The film is in contact with the pair of electrodes, and is positioned for contact with the medium. An electrical conductivity of the film depends on an amount of chloride ions taken up by the film. Some techniques allow chloride ion measurements over years at sensors embedded in concrete. Such measurements allow the determination of the progress of rebar corrosion in concrete infrastructure.

Techniques for sensing chloride ions in wet or dry media

Some techniques for monitoring health of a vessel include attaching a sensor suite of one or more sensors to an outer skin of the vessel and providing power for the sensor suite based on a temperature difference between a fluid temperature of a contained fluid inside the vessel and an ambient temperature outside the vessel. Some techniques include attaching a sensor suite by cinching a belt around the vessel and causing two ends of a strain gauge in the sensor suite to become rigidly attached to the outer skin of the vessel, for example, on opposite sides of a weld joining two sections of the vessel. These techniques allow a pipeline to be readily instrumented and monitored remotely which reduces manpower costs for performing manual inspections, reduces the risks of injury from performing manual inspections during hazardous weather conditions, and reduces the likelihood of undetected leaks.

Techniques for monitoring health of vessels containing fluids

A multi-functional sensor system for simultaneously monitoring various parameters such as the structural, chemical and environmental conditions associated with a medium to be monitored, e.g., bridges, high-rise buildings, pollution zones, is provided wherein the system includes at least a plurality of wireless multi-functional sensor platforms embedded in the medium in which an interrogation unit transmits power and receives responses. Each wireless multi-functional sensor platform includes multiple channels for accommodating a plurality of sensor types to simultaneously monitor the parameters associated with the medium. Thus, the wireless sensor platforms are formed to include those sensor types which are considered germane to the intended medium to be monitored.

Wireless multi-functional sensor platform, system containing same and method for its use

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Laurel, MD, United States of America

Bliss G Carkhuff