Sundstrand Corporation

Seektech, Inc.

Seescan, Inc.

Edward N Denaci

Mark S Olsson

Ray Merewether

David A Cox

Jan Soukup

Ryan B Levin

Jeffrey A Prsha

Michael E Turgeon

Mark Frederick Fleming

Stephen M Bench

Lisa E Latimer

Christoph Hans Maier

William H Conn

Jeffrey A Praha

Trevor Lawrence

A high-Q human-portable, battery-powered self-correcting tunable resonator in a transmitter apparatus for inducing alternating currents of high quality in buried conductors to facilitate their location is disclosed. The transmitter apparatus may employ an FET-driven capacitive tuning circuit and a coil design that achieves high precision, high-quality transmission signals, and which may be equipped with a high-voltage booster for facilitating fault-localization applications.

Spring clips for use with locating transmitters

A high-Q human-portable, battery-powered self-correcting tunable resonator in a transmitter apparatus for inducing alternating currents of high quality in buried conductors to facilitate their location. The transmitter apparatus employs an FET-driven capacitive tuning circuit and a coil design that achieves high precision, high-quality transmission signals, and which is equipped with a high-voltage booster for facilitating fault-localization applications.

High-Q self tuning locating transmitter

A self-tuning resonator for use in a transmitter apparatus for inducing alternating currents in a buried conductor. The resonator is dynamically tuned at frequencies below 500 kHz by exploiting the inherent voltage-variability of net capacitance in multilayer ceramic capacitors. The transmitter apparatus provides improved efficiency and induced output power suitable for use in a man-portable locator system, providing a very high magnetic field output from a physically small battery-powered resonator at frequencies under 500 kHz. The resonator exhibits a very low equivalent series resistance (ESR) and is adaptively returned to a predetermined resonant frequency responsive to any changes in resonance arising from phenomena such as component heating, thereby supporting very high tank circuit currents from battery-powered source to produce very high magnetic flux output.

Compact self-tuned electrical resonator for buried object locator applications

A starting system and method for a gas turbine engine checks to determine whether ignition has occurred in a light off window. If such ignition has not occurred, a starter coupled to the gas turbine engine is deactuated to allow deceleration through the light off window while still attempting to ignite gases in the combustor. By providing an extra interval of time to achieve ignition, start reliability is enhanced.

Gas turbine engine starting system and method

A turbine engine monitoring system is provided which disposes a data storage device in permanent association with an engine being monitored. The data storage device comprises an electrically erasable programmable read-only memory which is contained in an enclosure and permanently attached to the engine. A connection link is provided to connect the memory device in signal communication with an external device, such as an engine control unit. The engine control unit is connected in signal communication with a plurality of transducers that enable the engine control unit to monitor the operational status of a plurality of parameters relating to the turbine engine. By permanently attaching the data storage device to the turbine engine, a lifetime information of the turbine engine can be maintained in permanent association with the turbine engine regardless of replacement of the turbine engine or its related engine control unit.

Turbine engine monitoring system

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San Diego, CA, United States of America

Edward N Denaci