Abstract: A device comprises a circuit board, a Rogowski coil on the circuit board, persistent data storage on the circuit board, and a control circuit on the circuit board for collecting values representing current sensed by the coil, and storing the values in the persistent memory.

Abstract: A method comprises collecting a data set of field characterization measurements at a location inside a reverberant cavity excited by signals having multiple discrete electromagnetic frequencies; and performing a number (n) of circular shifts on the data set by a frequency step (?f) and computing a covariance-based coefficient at each shift until the coefficient indicates a lack of correlation. The method further comprises computing a quality factor (Q) of the reverberant cavity as fc/(?f×n), where fc is center frequency of the data set.

Abstract: A method for generating sensor data is presented. A number of wireless power signals is sent to a group of sensor units. A number of wireless data collection signals is sent to the group of sensor units after the number of wireless power signals have been sent to the group of sensor units. Sensor data in a number of wireless response signals is received from the group of sensor units.

Abstract: A sensor device includes a capacitive probe including a first conductor and a second conductor. The sensor device also includes a radio to generate a signal based on a measurement associated with the capacitive probe and to provide the signal to the first conductor for transmission using the capacitive probe as a transmission antenna.

Abstract: An apparatus comprises a structure including a cavity that, when excited with electromagnetic energy, produces an electric field having randomized distribution of field amplitude and polarity. The apparatus further comprises a sensor within the cavity. The sensor has a plurality of antennas for wirelessly harvesting operating power along different paths within the cavity.

Abstract: A device comprises a circuit board, a Rogowski coil on the circuit board, persistent data storage on the circuit board, and a control circuit on the circuit board for collecting values representing current sensed by the coil, and storing the values in the persistent memory.

Abstract: A device comprises a circuit board, a Rogowski coil on the circuit board, persistent data storage on the circuit board, and a control circuit on the circuit board for collecting values representing current sensed by the coil, and storing the values in the persistent memory.

Abstract: A method for generating sensor data is presented. A number of wireless power signals is sent to a group of sensor units. A number of wireless data collection signals is sent to the group of sensor units after the number of wireless power signals have been sent to the group of sensor units. Sensor data in a number of wireless response signals is received from the group of sensor units.

Abstract: A highly resistive wire includes a non-metallic wire material having a resistance of at least ten kilo-ohms per meter. In one embodiment, the wire material can be fashioned from a carbon-loaded plastic material, having an inclusion of carbon particles in a quantity that yields a resistance of no less than 10 kilo-ohms per meter. In another embodiment, the wire can include a plurality of strands of wire material where each of the strands is surrounded by a thin layer of conductive or semi-conductive material. The highly resistive wire can be used as a single strand, or as a bundle of strands, as wiring in a structure prone to transient electrical or electromagnetic events, such as static discharge or lightning strikes, that might otherwise lead to damage of the structure.

Abstract: A method for generating sensor data is presented. A number of wireless power signals is sent to a group of sensor units. A number of wireless data collection signals is sent to the group of sensor units after the number of wireless power signals have been sent to the group of sensor units. Sensor data in a number of wireless response signals is received from the group of sensor units.

Abstract: A method and associated wireless monitor and data analysis system are provided. The method includes installing one or more of a plurality of wireless monitors at respective locations onboard a complex system on which a wireless system of interest is installed or planned for installation. The method may then include by the plurality of wireless monitors, emulating the wireless system of interest, and recording data related to performance of the wireless system of interest at one or more recorded times over a plurality of operating conditions of the complex system. The method may also include by the plurality of wireless monitors, collecting data including the respective locations of the wireless monitors correlated with respective recorded data and recorded times. In this regard, the collected data for the plurality of wireless monitors may be retrievable for analysis of the wireless system of interest based thereon.

Abstract: A device comprises a circuit board, a Rogowski coil on the circuit board, persistent data storage on the circuit board, and a control circuit on the circuit board for collecting values representing current sensed by the coil, and storing the values in the persistent memory.

Abstract: A method comprises collecting a data set of field characterization measurements at a location inside a reverberant cavity excited by signals having multiple discrete electromagnetic frequencies; and performing a number (n) of circular shifts on the data set by a frequency step (?f) and computing a covariance-based coefficient at each shift until the coefficient indicates a lack of correlation. The method further comprises computing a quality factor (Q) of the reverberant cavity as fc/(?f×n), where fc is center frequency of the data set.

Abstract: A sensor device includes a capacitive probe including a first conductor and a second conductor. The sensor device also includes a radio to generate a signal based on a measurement associated with the capacitive probe and to provide the signal to the first conductor for transmission using the capacitive probe as a transmission antenna.

Abstract: A method for generating sensor data is presented. A number of wireless power signals is sent to a group of sensor units. A number of wireless data collection signals is sent to the group of sensor units after the number of wireless power signals have been sent to the group of sensor units. Sensor data in a number of wireless response signals is received from the group of sensor units.

Abstract: A structure is described that includes a first faying surface, a second faying surface for creating an electrical bond with the first faying surface, and a sensor operatively placed proximate the first faying surface and the second faying surface. The sensor includes a current port for injecting a fixed current through the electrical bond, a voltage port for sensing a voltage across the electrical bond induced by the fixed current, a processing device programmed to determine a resistance of the electrical bond based on the fixed current and sensed voltage, and a wireless interface for transmitting at least one of the sensed voltage and the determined resistance to an external device.

Abstract: A method and associated wireless monitor and data analysis system are provided. The method includes installing one or more of a plurality of wireless monitors at respective locations onboard a complex system on which a wireless system of interest is installed or planned for installation. The method may then include by the plurality of wireless monitors, emulating the wireless system of interest, and recording data related to performance of the wireless system of interest at one or more recorded times over a plurality of operating conditions of the complex system. The method may also include by the plurality of wireless monitors, collecting data including the respective locations of the wireless monitors correlated with respective recorded data and recorded times. In this regard, the collected data for the plurality of wireless monitors may be retrievable for analysis of the wireless system of interest based thereon.

Abstract: An apparatus comprises a structure including a cavity that, when excited with electromagnetic energy, produces an electric field having randomized distribution of field amplitude and polarity. The apparatus further comprises a sensor within the cavity. The sensor has a plurality of antennas for wirelessly harvesting operating power along different paths within the cavity.

Abstract: A method and apparatus for operating a sensor system. A first wireless signal is transmitted from a base station to a sensor unit. At least a portion of the first wireless signal is changed into power for the sensor unit using a power harvesting unit in the sensor unit. Information is received from a number of sensors associated with the sensor unit. The information is transmitted to the base station using a second wireless signal.

Abstract: Technologies are described herein for wirelessly measuring liquid quantity in an enclosure. According to various aspects, an incident electromagnetic wave is transmitted within a conductive enclosure. One or more rebound electromagnetic waves that correspond to the incident electromagnetic wave are received. Using the rebound electromagnetic waves, a transfer function of the rebound electromagnetic waves is measured and a quantity of liquid stored in the enclosure is calculated based on the measured transfer function.