Abstract: An induction sensor generates speed data based on a frequency of the change in magnetic flux within the sensor and powers sensor circuitry by recharging a power source using at least a portion of the electrical voltage induced by the change in magnetic flux. In this manner, the induction sensor may generate its own power to sense and transmit data. To optimize the recharging power available from the induced electrical voltage, the sensor may also include a variable load. This variable load may be automatically controlled by the sensor based on the induced voltage and/or current. The induction sensor may also wirelessly transmit generated data. In addition, the sensor may, after shutting down, automatically power up in response to the change in magnetic flux exceeding a start-up threshold.

Abstract: An induction sensor generates speed data based on a frequency of the change in magnetic flux within the sensor and powers sensor circuitry by recharging a power source using at least a portion of the electrical voltage induced by the change in magnetic flux. In this manner, the induction sensor may generate its own power to sense and transmit data. To optimize the recharging power available from the induced electrical voltage, the sensor may also include a variable load. This variable load may be automatically controlled by the sensor based on the induced voltage and/or current. The induction sensor may also wirelessly transmit generated data. In addition, the sensor may, after shutting down, automatically power up in response to the change in magnetic flux exceeding a start-up threshold.

Abstract: An EMI shielded sensing system is for measuring parameters associated with a rotating device having a rotating shaft. The system includes a rotating unit mechanically coupled to the rotating shaft. The rotating unit includes a sensor that provides a sensing signal that is coupled to a first antenna. A stationary unit includes a second antenna. The stationary unit and rotating unit are in wireless communication via a wireless link, and the stationary unit provides RF energy to power the rotating unit over the wireless link. The rotating unit sends the sensing output to the stationary unit over the wireless link. A multi-metal shroud for EMI shielding is positioned around the rotating unit and stationary unit. The shroud includes a ferromagnetic layer and a non-ferromagnetic layer.

Abstract: Nitrogen oxide sensors and methods for fabricating them are provided. According to an exemplary embodiment of the present invention, the method comprises providing an electrically insulating substrate having a first surface and a second surface. Two electrodes are fabricated on the first surface of the substrate. Each of the electrodes has a first end configured to receive a current and a second end. A nanopowder of a barium tungstate comprising nanoparticles of substantially uniform particle size is synthesized. A film of the barium tungstate nanopowder is deposited overlying the first surface of the substrate and in electrical contact with the second ends of the electrodes. The film is sintered and a heater is fabricated on the second surface of the substrate.

Abstract: A gas flow sensor system, and method for gas flow rate measurement and self-calibration to overcome problems caused by degradation. Gas flow rate is accurately measured by determining the power dissipated at a constant differential temperature of a gas flow sensor, under conditions where its power dissipation is independent of its resistance. The gas flow sensor is adjusted to a predefined differential temperature compared to the temperature of the gas. In addition, variations in heat transfer coefficient (h) of a gas flow sensor are corrected by self-calibration of the gas flow sensor system. Experimentally established correction factors are applied to the gas flow sensor, to compensate for changes in its heat transfer coefficient (h) caused by degradation of the gas flow sensor. This offsets the adverse effects of use and aging of the gas flow sensor, thus reducing errors in gas flow measurement.

Abstract: A non-invasive method for measuring the flow rate and temperature of a gas flowing through a gas passageway. An inventive ultrasound sensor assembly includes a housing having opposed first and second ultrasound transducers. The housing is attachable onto an outside surface of a gas passageway, such as a pipe, at an angle ? relative to a gas low direction within the gas passageway. Ultrasonic signals are sent from the first ultrasound transducer to the second ultrasound transducer, and vice versa, through the gas flow. Gas flow velocity and gas temperature are determined with the measured transit times of these ultrasonic signals through the gas flow. This non-invasive method eliminates sensor degradation, and eliminates the need for separate flow and temperature sensors. It also reduces power and time requirements, thus reducing cost.

Abstract: A gas flow sensor system, and method for gas flow rate measurement and self-calibration to overcome problems caused by degradation. Gas flow rate is accurately measured by determining the power dissipated at a constant differential temperature of a gas flow sensor, under conditions where its power dissipation is independent of its resistance. The gas flow sensor is adjusted to a predefined differential temperature compared to the temperature of the gas. In addition, variations in heat transfer coefficient (h) of a gas flow sensor are corrected by self-calibration of the gas flow sensor system. Experimentally established correction factors are applied to the gas flow sensor, to compensate for changes in its heat transfer coefficient (h) caused by degradation of the gas flow sensor. This offsets the adverse effects of use and aging of the gas flow sensor, thus reducing errors in gas flow measurement.