Abstract: 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.

Abstract: An embeddable corrosion rate meter (ECRM) for detecting and measuring corrosion in metal and concrete structures is provided. The system comprises an electrochemical cell with at least one working electrode evenly separated from a counter electrode, wherein a separation distance between electrodes determines an electrolyte medium resistance and the electrolyte medium resistance is less than or equal to a polarization resistance.

Abstract: A long-life conductivity sensor system and method that is embeddable or immersible in a medium. The conductivity sensor system includes at least a housing with an enclosing wall that defines an interior volume and that has at least one aperture through the wall; a pair of electrodes protruding through the aperture into a medium surrounding the sensor housing; and conductivity sensing electronics contained within the sensor housing interior volume and connected to the pair of electrodes. The conductivity sensing electronics include a galvanostat connected to the electrodes for inducing discrete constant current pulses between the electrodes creating a transient voltage signal between the electrodes; and a high-speed voltmeter/A-D Converter connected to the electrodes for measuring the transient voltage signal between the electrodes, the transient voltage signal being a function of the conductivity of the medium surrounding the sensor housing.

Abstract: A long-life conductivity sensor system and method that is embeddable or immersible in a medium. The conductivity sensor system includes at least a housing with an enclosing wall that defines an interior volume and that has at least one aperture through the wall; a pair of electrodes protruding through the aperture into a medium surrounding the sensor housing; and conductivity sensing electronics contained within the sensor housing interior volume and connected to the pair of electrodes. The conductivity sensing electronics include a galvanostat connected to the electrodes for inducing discrete constant current pulses between the electrodes creating a transient voltage signal between the electrodes; and a high-speed voltmeter/A-D Converter connected to the electrodes for measuring the transient voltage signal between the electrodes, the transient voltage signal being a function of the conductivity of the medium surrounding the sensor housing.

Abstract: A pH sensor system (10) and method capable of monitoring the pH level of a medium based on the characteristics of a chromatic pH sensitive material employed in the pH sensor system is provided. The pH sensor system includes at least a housing (12) having at least one transparent surface (14); a light sensitive circuitry (15), e.g., a LED (16) and photo-detector (18), enclosed within the housing; and, a chromatic pH sensitive material (20) overlaying at least a portion of the transparent surface having the characteristic of becoming saturated when an ambient pH level reaches a predetermined level such that the light sensitive circuitry detects a different intensity of incident light when the chromatic pH sensitive material is saturated than when the chromatic pH sensitive material is not saturated. As the pH level of the medium, e.g., concrete, storage tanks containing chemical reagents, etc.