Patents by Inventor Gregory W. Keith
Gregory W. Keith has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9568317Abstract: A system comprising a fiber optic gyroscope and a mixed signal application specific integrated circuit (ASIC) connected to the gyroscope is provided. The mixed signal ASIC comprises a digital logic unit, a relative intensity noise (RIN) analog-to-digital converter (ADC) coupled to the digital logic unit and configurable to receive a signal from a RIN detector, and a rate ADC coupled to the digital logic unit and configurable to receive a signal from a rate detector. The mixed signal ASIC also includes a light source digital-to-analog converter (DAC) coupled to the digital logic unit, and a thermo-electric cooler DAC coupled to the digital logic unit, both of which are configurable to send control signals to a light source of the gyroscope. The mixed signal ASIC further includes an integrated optical chip DAC, an eigen-frequency servo DAC, and a heater servo DAC, all of which are coupled to the digital logic unit.Type: GrantFiled: January 31, 2013Date of Patent: February 14, 2017Assignee: Honeywell International Inc.Inventors: Chuck Croker, Gregory W Keith, Norman Gerard Tarleton
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Publication number: 20140211210Abstract: A system comprising a fiber optic gyroscope and a mixed signal application specific integrated circuit (ASIC) connected to the gyroscope is provided. The mixed signal ASIC comprises a digital logic unit, a relative intensity noise (RIN) analog-to-digital converter (ADC) coupled to the digital logic unit and configurable to receive a signal from a RIN detector, and a rate ADC coupled to the digital logic unit and configurable to receive a signal from a rate detector. The mixed signal ASIC also includes a light source digital-to-analog converter (DAC) coupled to the digital logic unit, and a thermo-electric cooler DAC coupled to the digital logic unit, both of which are configurable to send control signals to a light source of the gyroscope. The mixed signal ASIC further includes an integrated optical chip DAC, an eigen-frequency servo DAC, and a heater servo DAC, all of which are coupled to the digital logic unit.Type: ApplicationFiled: January 31, 2013Publication date: July 31, 2014Applicant: HONEYWELL INTERNATIONAL INC.Inventors: Chuck Croker, Gregory W. Keith, Norman Gerard Tarleton
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Patent number: 8542364Abstract: A fiber optic gyroscope includes a light source, an optical coupler in optical communication with the light source, with the optical coupler configured to receive an optical signal from the light source, an optical modulator in optical communication with the optical coupler, and a fiber optic coil in optical communication with the optical modulator. A demodulator is configured to receive an optical signal from the optical coupler and convert the optical signal to an electrical signal. A loop closure electronics module is configured to receive the electrical signal from the demodulator. A bias modulator is responsive to an output from the loop closure electronics module and is configured to output a modulation signal to the optical modulator. A first crosstalk filter network is operatively coupled to the demodulator, and a second crosstalk filter network is operatively coupled to the bias modulator.Type: GrantFiled: December 17, 2009Date of Patent: September 24, 2013Assignee: Honeywell International Inc.Inventors: Gregory W Keith, Derek Mead, Douglas E. Smith, Norman Gerard Tarleton
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Publication number: 20110304852Abstract: One embodiment is directed to a power supply for a fiber optic gyroscope that comprises at least one main power supply, at least one demodulator local power supply to operatively couple the main power supply to a demodulator included in the fiber optic gyroscope, and at least one modulator local power supply to operatively couple the main power supply to a bias modulator included in the fiber optic gyroscope. The demodulator local power supply comprises a first current source to source current to the demodulator and a first shunt regulator coupled across a load associated with the demodulator. The modulator local power supply comprises a second current source to source current to the bias modulator and a second shunt regulator coupled across a load associated with the bias modulator.Type: ApplicationFiled: June 11, 2010Publication date: December 15, 2011Applicant: HONEYWELL INTERNATIONAL INC.Inventors: Gregory W. Keith, Paul Schwerman
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Patent number: 8077321Abstract: One embodiment is directed to a power supply for a fiber optic gyroscope that comprises at least one main power supply, at least one demodulator local power supply to operatively couple the main power supply to a demodulator included in the fiber optic gyroscope, and at least one modulator local power supply to operatively couple the main power supply to a bias modulator included in the fiber optic gyroscope. The demodulator local power supply comprises a first current source to source current to the demodulator and a first shunt regulator coupled across a load associated with the demodulator. The modulator local power supply comprises a second current source to source current to the bias modulator and a second shunt regulator coupled across a load associated with the bias modulator.Type: GrantFiled: June 11, 2010Date of Patent: December 13, 2011Assignee: Honeywell International Inc.Inventors: Gregory W Keith, Paul Schwerman
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Patent number: 7583384Abstract: Methods and system are provided for driving light through a sensing coil of an optical gyro. The system includes a photodetection circuit having an input for receiving an optical output from the sensing coil and having an output, and a signal processing circuit having an input coupled to the output of the photodetection circuit and having an output for supplying an output signal to modulate the sensing coil. The photodetection system produces a digital signal from the optical output. The signal processing circuit produces a feedback signal from the digital signal and adds a random number to the feedback signal to produce the output signal.Type: GrantFiled: July 27, 2006Date of Patent: September 1, 2009Assignee: Honeywell International, Inc.Inventors: Gregory W. Keith, Thomas C. Greening, Lee K. Strandjord
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Patent number: 7561085Abstract: Systems and methods for improving efficiency of a data converter. An example method generates a noise signal, alters the spectrum of the noise signal based on operation of an associated data converter, and supplies the altered spectrum noise signal to the associated data converter. The data converter is a digital-to-analog converter or an analog-to-digital converter. The altered spectrum noise signal is notched at frequencies of interest. The spectrum is altered by sending a signal generated by a random number generator to a delay device and adding the output of the delay device from the output of the random number generator. Also, the spectrum is altered by seeding first and second identical random number generators, delaying the operation of the first random number generator, and adding the output of the delayed first random number generator from the second random number generator.Type: GrantFiled: March 21, 2007Date of Patent: July 14, 2009Assignee: Honeywell International Inc.Inventors: Matthew P. Newlin, Lee K. Strandjord, Thomas C. Greening, Gregory W. Keith
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Publication number: 20090128826Abstract: Methods and system are provided for driving light through a sensing coil of an optical gyro. The system includes a photodetection circuit having an input for receiving an optical output from the sensing coil and having an output, and a signal processing circuit having an input coupled to the output of the photodetection circuit and having an output for supplying an output signal to modulate the sensing coil. The photodetection system produces a digital signal from the optical output. The signal processing circuit produces a feedback signal from the digital signal and adds a random number to the feedback signal to produce the output signal.Type: ApplicationFiled: July 27, 2006Publication date: May 21, 2009Inventors: Gregory W. Keith, Thomas C. Greening, Lee K. Strandjord
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Patent number: 7531783Abstract: A trans-impedance amplifier with gain control for a fiber optic rotation rate sensor. A variable gain amplifier having gain control based on keeping the amplifier output above a certain level. The gain control approach allows the amplifier bandwidth to remain constant. A gain control circuit includes a control device connected to ground and the amplifier feedback network. The input to the gain control circuit may be the amplifier output that has been filtered, or the input could be from an external circuit or microcontroller.Type: GrantFiled: June 15, 2007Date of Patent: May 12, 2009Assignee: Honeywell International Inc.Inventors: Gregory W. Keith, Chung-Jen Chen
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Publication number: 20080308713Abstract: A trans-impedance amplifier with gain control for a fiber optic rotation rate sensor. A variable gain amplifier having gain control based on keeping the amplifier output above a certain level. The gain control approach allows the amplifier bandwidth to remain constant. A gain control circuit includes a control device connected to ground and the amplifier feedback network. The input to the gain control circuit may be the amplifier output that has been filtered, or the input could be from an external circuit or microcontroller.Type: ApplicationFiled: June 15, 2007Publication date: December 18, 2008Applicant: HONEYWELL INTERNATIONAL INC.Inventors: Gregory W. Keith, Chung-Jen Chen
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Publication number: 20080231485Abstract: Systems and methods for improving efficiency of a data converter. An example method generates a noise signal, alters the spectrum of the noise signal based on operation of an associated data converter, and supplies the altered spectrum noise signal to the associated data converter. The data converter is a digital-to-analog converter or an analog-to-digital converter. The altered spectrum noise signal is notched at frequencies of interest. The spectrum is altered by sending a signal generated by a random number generator to a delay device and adding the output of the delay device from the output of the random number generator. Also, the spectrum is altered by seeding first and second identical random number generators, delaying the operation of the first random number generator, and adding the output of the delayed first random number generator from the second random number generator.Type: ApplicationFiled: March 21, 2007Publication date: September 25, 2008Applicant: HONEYWELL INTERNATIONAL INC.Inventors: Matthew P. Newlin, Lee K. Strandjord, Thomas C. Greening, Gregory W. Keith
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Patent number: 6504100Abstract: A reversible wire management system includes a mounting bracket having first and second planar members, the first and second planar members each including a set of retention bracket mounting features, wherein each set of retention bracket mounting features includes at least one mounting feature, which may be a slot, for connecting the respective planar member to a retention bracket, and at least one retention bracket, which may be a bifurcated O-ring, removeably attached to the first mounting bracket planar member using the first set of retention bracket mounting features, wherein the at least one retention bracket is adaptable to be selectively removed and reconnected to the second mounting bracket planar member using the second set of retention bracket mounting features.Type: GrantFiled: March 9, 2001Date of Patent: January 7, 2003Assignee: Chatsworth Products, Inc.Inventors: James I. Lawrence, Mark R. Benavides, Daniel W. Walker, William D. Krietzman, D. Brian Donowho, Bryan W. Hurley, Gregory W. Keith
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Publication number: 20020074149Abstract: A reversible wire management system includes a mounting bracket having first and second planar members, the first and second planar members each including a set of retention bracket mounting features, wherein each set of retention bracket mounting features includes at least one mounting feature, which may be a slot, for connecting the respective planar member to a retention bracket, and at least one retention bracket, which may be a bifurcated O-ring, removeably attached to the first mounting bracket planar member using the first set of retention bracket mounting features, wherein the at least one retention bracket is adaptable to be selectively removed and reconnected to the second mounting bracket planar member using the second set of retention bracket mounting features.Type: ApplicationFiled: March 9, 2001Publication date: June 20, 2002Inventors: James I. Lawrence, Mark R. Benavides, Daniel W. Walker, William D. Krietzman, D. Brian Donowho, Bryan W. Hurley, Gregory W. Keith