Patents by Inventor Randy Dean May
Randy Dean May 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: 8182143Abstract: Ambient temperature for a temperature sensor can be calculated using a mobile temperature sensor system that samples air from the boundary layer around a mobile platform and passes the air through a measurement cell containing two flush-mounted or embedded sensor elements. A common reference voltage can be applied by control circuitry to minimize drift in the sensor element readings and to calculate the ambient temperature.Type: GrantFiled: August 9, 2007Date of Patent: May 22, 2012Assignee: SpectraSensors, Inc.Inventors: Rex J. Fleming, Randy Dean May, W. Stephen Woodward
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Patent number: 7504631Abstract: A system and method are disclosed for the detection of water vapor in a natural gas background. The system includes a light source operating in a wavelength range such as, 1.877-1.901 ?m, 2.711-2.786 ?m, or 920-960 nm, passes through the natural gas to be detected by a detector. In one embodiment, the light source is a tunable diode laser and the moisture level is determined by harmonic spectroscopy. In other embodiments, a VCSEL laser is utilized.Type: GrantFiled: October 25, 2006Date of Patent: March 17, 2009Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Patent number: 7460567Abstract: The method and system operate to maintain a widely tunable laser (WTL) at a selected transmission wavelength. To lock the WTL to an ITU grid line, a portion of the output beam from the WTL is routed through the etalon to split the beam into a transmission line for detection by an etalon fringe detector. Another portion of the beam is routed directly to a laser wavelength detector to determine the power of the beam. A wavelength-locking controller compares signals from the two detectors and adjusts the temperature of the etalon to align the wavelength of one of the transmission lines of the etalon with the wavelength of the output beam, then controls the WTL in a feedback loop to lock the laser to the etalon line. The wavelength-locking controller thereafter monitors the temperature of the etalon and keeps the temperature constant to prevent any wavelength drift attributable to the etalon.Type: GrantFiled: April 11, 2006Date of Patent: December 2, 2008Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Publication number: 20080159354Abstract: Ambient temperature for a temperature sensor can be calculated using a mobile temperature sensor system that samples air from the boundary layer around a mobile platform and passes the air through a measurement cell containing two flush-mounted or embedded sensor elements. A common reference voltage can be applied by control circuitry to minimize drift in the sensor element readings and to calculate the ambient temperature.Type: ApplicationFiled: August 9, 2007Publication date: July 3, 2008Inventors: Rex J. Fleming, Randy Dean May, W. Stephen Woodward
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Patent number: 7339168Abstract: A system and method are disclosed for the detection of water vapor in a natural gas background. The system includes a light source operating in a wavelength range such as, 1.877-1.901 ?m, 2.711-2.786 ?m, or 920-960 nm, passes through the natural gas to be detected by a detector. In one embodiment, the light source is a tunable diode laser and the moisture level is determined by harmonic spectroscopy. In other embodiments, a VCSEL laser is utilized.Type: GrantFiled: October 25, 2006Date of Patent: March 4, 2008Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Patent number: 7166843Abstract: A system and method can detect ethylene oxide in a sample of gas, such as air. The system includes a light source operating at a wavelength where molecules typically found within air absorb light at a substantially lower level than ethylene oxide molecules. Exemplary wavelengths are in the range of approximately 1.6–2.2 ?m, and in particular at 1.6 ?m, 1.645 ?m, 1.692 ?m, 2.195 ?m, 2.2 ?m, 2.216 ?m, passes through the sample of gas to be detected by a detector. In one variation, the light source is a tunable diode laser or a VCSEL and the ethylene oxide level is determined using harmonic spectroscopy.Type: GrantFiled: January 29, 2004Date of Patent: January 23, 2007Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Patent number: 7132661Abstract: A system and method are disclosed for the detection of water vapor in a natural gas background. The system includes a light source operating in a wavelength range such as, 1.877–1.901 ?m, 2.711–2.786 ?m, or 920–960 nm, passes through the natural gas to be detected by a detector. In one embodiment, the light source is a tunable diode laser and the moisture level is determined by harmonic spectroscopy. In other embodiments, a VCSEL laser is utilized.Type: GrantFiled: October 16, 2003Date of Patent: November 7, 2006Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Patent number: 7027470Abstract: The method and system operate to maintain a widely tunable laser (WTL) at a selected transmission wavelength. To lock the WTL to an ITU grid line, a portion of the output beam from the WTL is routed through the etalon to split the beam into a transmission line for detection by an etalon fringe detector. Another portion of the beam is routed directly to a laser wavelength detector to determine the power of the beam. A wavelength-locking controller compares signals from the two detectors and adjusts the temperature of the etalon to align the wavelength of one of the transmission lines of the etalon with the wavelength of the output beam, then controls the WTL in a feedback loop to lock the laser to the etalon line. The wavelength-locking controller thereafter monitors the temperature of the etalon and keeps the temperature constant to prevent any wavelength drift attributable to the etalon.Type: GrantFiled: August 11, 2003Date of Patent: April 11, 2006Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Publication number: 20040245471Abstract: A system and method are disclosed for the detection of ethylene oxide in a sample of gas, such as air. The system includes a light source operating at a wavelength where molecules typically found within air absorb light at a substantially lower level than ethylene oxide molecules. Exemplary wavelengths are in the range of approximately 1.6-2.2 &mgr;m, and in particular at 1.6 &mgr;m, 1.645 &mgr;m, 1.692 &mgr;m, 2.195 &mgr;m, 2.2 &mgr;m, 2.216 &mgr;m, passes through the sample of gas to be detected by a detector. In one embodiment, the light source is a tunable diode laser or a VCSEL and the ethylene oxide level is determined using harmonic spectroscopy.Type: ApplicationFiled: January 29, 2004Publication date: December 9, 2004Applicant: SpectraSensors, Inc.Inventor: Randy Dean May
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Publication number: 20040079887Abstract: A system and method are disclosed for the detection of water vapor in a natural gas background. The system includes a light source operating in a wavelength range such as, 1.877-1.901 &mgr;m, 2.711-2.786 &mgr;m, or 920-960 nm, passes through the natural gas to be detected by a detector. In one embodiment, the light source is a tunable diode laser and the moisture level is determined by harmonic spectroscopy. In other embodiments, a VCSEL laser is utilized.Type: ApplicationFiled: October 16, 2003Publication date: April 29, 2004Inventor: Randy Dean May
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Publication number: 20040066810Abstract: The method and system operate to maintain a widely tunable laser (WTL) at a selected transmission wavelength. To lock the WTL to an ITU grid line, a portion of the output beam from the WTL is routed through the etalon to split the beam into a transmission line for detection by an etalon fringe detector. Another portion of the beam is routed directly to a laser wavelength detector to determine the power of the beam. A wavelength-locking controller compares signals from the two detectors and adjusts the temperature of the etalon to align the wavelength of one of the transmission lines of the etalon with the wavelength of the output beam, then controls the WTL in a feedback loop to lock the laser to the etalon line. The wavelength-locking controller thereafter monitors the temperature of the etalon and keeps the temperature constant to prevent any wavelength drift attributable to the etalon.Type: ApplicationFiled: August 11, 2003Publication date: April 8, 2004Inventor: Randy Dean May
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Patent number: 6714309Abstract: The method and system operate to calibrate a transmission laser of the dense wavelength division multiplexer (DWDM) and to lock the laser to a selected transmission wavelength. In one example, the transmission laser is a widely tunable laser (WTL) to be tuned to one of a set of International Telecommunications Union (ITU) transmission grid lines for transmission through an optic fiber. To lock the WTL to an ITU grid line, a portion of the output beam from the WTL is routed through the etalon to split the beam into a set of transmission lines for detection by a detector. Another portion of the beam is routed directly to another detector. A wavelength-locking controller compares signals from the two detectors and adjusts the temperature of the etalon to align the wavelength of one of the transmission lines of the etalon with the wavelength of the output beam, then controls the WTL in a feedback loop to lock the laser to the etalon line.Type: GrantFiled: January 31, 2001Date of Patent: March 30, 2004Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Patent number: 6693928Abstract: The method and system operate to calibrate a transmission laser of the dense wavelength division multiplexer (DWDM) and to lock the laser to a selected transmission wavelength. In one example, the transmission laser is a widely tunable laser (WTL) to be tuned to one of a set of International Telecommunications Union (ITU) transmission grid lines for transmission through an optic fiber. To lock the WTL to an ITU grid line, a portion of the output beam from the WTL is routed through the etalon to split the beam into a set of transmission lines for detection by an etalon fringe detector. Another portion of the beam is routed directly to a laser wavelength detector. A wavelength-locking controller compares signals from the two detectors and adjusts the temperature of the etalon to align the wavelength of one of the transmission lines of the etalon with the wavelength of the output beam, then controls the WTL in a feedback loop to lock the laser to the etalon line.Type: GrantFiled: September 28, 2001Date of Patent: February 17, 2004Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Tunable semiconductor laser having cavity with ring resonator mirror and mach-zehnder interferometer
Patent number: 6690687Abstract: A semiconductor laser is provided having a cavity including a gain chip, a Mach-Zehnder wide tuning port, and a ring resonator mirror. Optical signals generated by the gain chip propagate through the Mach-Zehnder wide tuning port and into the ring resonator mirror where the optical signals are reflected back through the Mach-Zehnder wide tuning port to the gain chip. The ring resonator is configured to reflect only those optical signals back into the laser cavity having wavelengths within a set of sharp peaks and the laser cavity therefore can resonate only within one of the sharp peaks. The ring resonator mirror is heated to adjust its dimensions so as to maintain one of the sharp peaks at a selected emission wavelength. As optical signals reflected from the ring resonator pass through the Mach-Zehnder wide tuning port, the signals are split between two channels of differing lengths resulting in optical interference.Type: GrantFiled: January 2, 2001Date of Patent: February 10, 2004Assignee: SpectraSensors, Inc.Inventors: Alexander Ksendzov, Randy Dean May -
Patent number: 6671296Abstract: The method and system operate to maintain a widely tunable laser (WTL) at a selected transmission wavelength. To lock the WTL to an ITU grid line, a portion of the output beam from the WTL is routed through the etalon to split the beam into a transmission line for detection by an etalon fringe detector. Another portion of the beam is routed directly to a laser wavelength detector to determine the power of the beam. A wavelength-locking controller compares signals from the two detectors and adjusts the temperature of the etalon to align the wavelength of one of the transmission lines of the etalon with the wavelength of the output beam, then controls the WTL in a feedback loop to lock the laser to the etalon line. The wavelength-locking controller thereafter monitors the temperature of the etalon and keeps the temperature constant to prevent any wavelength drift attributable to the etalon.Type: GrantFiled: March 5, 2002Date of Patent: December 30, 2003Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Patent number: 6657198Abstract: A system and method are disclosed for the detection of water vapor in a natural gas background. The system includes a light source operating in the 1.877-1.901 &mgr;m wavelength range passes through the natural gas to be detected by a detector. In one embodiment, the light source is a tunable diode laser and the moisture level is determined by harmonic spectroscopy.Type: GrantFiled: August 28, 2001Date of Patent: December 2, 2003Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Patent number: 6633593Abstract: The semiconductor laser has a resonance cavity composed of a gain chip, a Mach-Zehnder wide tuning port, and a wavelength-selective mirror component formed either as a ring resonator or a reflective Fabry-Perot etalon. Optical signals generated by the gain chip propagate through the wide tuning port and into the wavelength-selective mirror component and are then reflected back to the gain chip. The wavelength-selective mirror component is configured to reflect only those optical signals having wavelengths within a set of sharp peaks so that the laser cavity resonates only within the sharp peaks. The wavelength-selective mirror component is heated to adjust internal dimensions to maintain one of the sharp peaks at a selected emission wavelength. As optical signals pass through the wide tuning port, the signals are split between two channels of differing lengths resulting in optical interference.Type: GrantFiled: December 28, 2001Date of Patent: October 14, 2003Assignee: SpectraSensors, Inc.Inventors: Alexander Ksendzov, Randy Dean May
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Patent number: 6622556Abstract: A total temperature probe with a complimentary sensor cavity for measuring multiple properties of a fluid flowing rapidly through the probe. The probe includes a sensor housing for diverting a portion of the rapidly flowing fluid into a primary flow path. A sample chamber within the probe houses a total temperature probe and is configured to divert a portion of the rapidly flowing fluid from a primary flowpath. An ancillary chamber adjacent to the sample chamber is configured to house an additional sensor and to divert a portion of the rapidly flowing fluid from the sample chamber. In some embodiments, the ancillary chamber diverts fluid directly from the rapidly flowing fluid. Preferably, the sensor housed within the ancillary chamber measures the water vapor level within the rapidly flowing fluid.Type: GrantFiled: April 11, 2002Date of Patent: September 23, 2003Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Patent number: 6611341Abstract: The method and system operate to calibrate a transmission laser of the dense wavelength division multiplexer (DWDM) and to lock the laser to a selected transmission wavelength. In one example, the transmission laser is a widely tunable laser (WTL) to be tuned to one of a set of International Telecommunications Union (ITU) transmission grid lines for transmission through an optic fiber. To lock the WTL to an ITU grid line, a portion of the output beam from the WTL is routed through the etalon to split the beam into a set of transmission lines for detection by a detector. Another portion of the beam is routed directly to another detector. A wavelength-locking controller compares signals from the two detectors and adjusts the temperature of the etalon to align the wavelength of one of the transmission lines of the etalon with the wavelength of the output beam, then controls the WTL in a feedback loop to lock the laser to the etalon line.Type: GrantFiled: March 17, 2001Date of Patent: August 26, 2003Assignee: SpectraSensors, Inc.Inventor: Randy Dean May
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Patent number: 6587484Abstract: The method and apparatus operates to calibrate a transmission laser of the dense wavelength division multiplexer (DWDM). In one example, the transmission laser is a widely tunable laser (WTL) to be tuned to one of a set of International Telecommunications Union (ITU) transmission grid lines for transmission through an optic fiber. The WTL is tuned to the ITU grid using an etalon and a gas cell having acetylene, hydrogen cyanide or carbon dioxide. Initially, the absolute transmission wavelengths of the WTL are calibrated by routing an output beam from the WTL through the etalon and through the gas cell while varying tuning parameters of the WTL to thereby generate an etalon spectrum and a gas absorption spectrum both as functions of the tuning parameters. The etalon and gas absorption spectra are compared, along with input reference information specifying gas absorption as a function of absolute wavelength, to determine the absolute transmission wavelength for the WTL as a function of the tuning parameters.Type: GrantFiled: October 10, 2000Date of Patent: July 1, 2003Assignee: SpectraSensor, Inc,.Inventor: Randy Dean May