Patents by Inventor Nabeel Agha Riza

Nabeel Agha Riza 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).

  • Patent number: 10721411
    Abstract: The present invention provides a method for performing high dynamic range optical image detection of a scene comprising: imaging incident light from a scene onto an object plane; determining the locations of those pixels in the object plane of higher brightness; detecting the optical irradiance values of those pixels of higher brightness to produce a first detected image; detecting the optical irradiance values of those pixels of lower brightness to produce a second detected image; and generating a high dynamic range optical irradiance map of the scene by combining the first detected image and the second detected image into a single image.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: July 21, 2020
    Assignee: University College Cork—National University of Ireland, Cork
    Inventor: Nabeel Agha Riza
  • Patent number: 10356392
    Abstract: A method for performing high dynamic range optical image detection of a scene. The method comprises imaging incident light from a scene onto an object plane of an Optical Array Device, the OAD operating in time modulation mode; determining the locations of those pixels in the object plane of a first light level; detecting the optical irradiance values of those pixels of the first light level to produce a first detected image; detecting the optical irradiance values of those pixels of a second light level to produce a second detected image; and generating a high dynamic range optical irradiance map of the scene by combining the first detected image and the second detected image into a single image.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: July 16, 2019
    Assignee: University College Cork—National Univesity of Ireland, Cork
    Inventor: Nabeel Agha Riza
  • Publication number: 20190109973
    Abstract: The present invention provides a method for performing high dynamic range optical image detection of a scene comprising: imaging incident light from a scene onto an object plane; determining the locations of those pixels in the object plane of higher brightness; detecting the optical irradiance values of those pixels of higher brightness to produce a first detected image; detecting the optical irradiance values of those pixels of lower brightness to produce a second detected image; and generating a high dynamic range optical irradiance map of the scene by combining the first detected image and the second detected image into a single image.
    Type: Application
    Filed: October 21, 2015
    Publication date: April 11, 2019
    Inventor: Nabeel Agha Riza
  • Publication number: 20170026633
    Abstract: A method for performing high dynamic range optical image detection of a scene. The method comprises imaging incident light from a scene onto an object plane of an Optical Array Device, the OAD operating in time modulation mode; determining the locations of those pixels in the object plane of a first light level; detecting the optical irradiance values of those pixels of the first light level to produce a first detected image; detecting the optical irradiance values of those pixels of a second light level to produce a second detected image; and generating a high dynamic range optical irradiance map of the scene by combining the first detected image and the second detected image into a single image.
    Type: Application
    Filed: May 24, 2016
    Publication date: January 26, 2017
    Applicant: University College Cork - National University of Ireland, Cork
    Inventor: Nabeel Agha RIZA
  • Publication number: 20140161466
    Abstract: The invention provides power smart in-door optical wireless link that provides lossless beam propagation between Transmitter (T) and Receiver (R) for changing link distances including in conditions of transmit and receive beam spoiling due to environmental effects. Each T/R unit uses a combination of fixed and variable focal length optics (called inverse adaptive optics) to smartly adjust the transmit beam laser beam propagation parameters of minimum beam waist size and its location to produce the optimal zero propagation loss coupling condition at the Receiver for the specific link distance.
    Type: Application
    Filed: December 2, 2013
    Publication date: June 12, 2014
    Inventor: Nabeel Agha Riza
  • Patent number: 8096704
    Abstract: Silicon Carbide (SiC) probe designs for extreme temperature and pressure sensing uses a single crystal SiC optical chip encased in a sintered SiC material probe. The SiC chip may be protected for high temperature only use or exposed for both temperature and pressure sensing. Hybrid signal processing techniques allow fault-tolerant extreme temperature sensing. Wavelength peak-to-peak (or null-to-null) collective spectrum spread measurement to detect wavelength peak/null shift measurement forms a coarse-fine temperature measurement using broadband spectrum monitoring. The SiC probe frontend acts as a stable emissivity Black-body radiator and monitoring the shift in radiation spectrum enables a pyrometer. This application combines all-SiC pyrometry with thick SiC etalon laser interferometry within a free-spectral range to form a coarse-fine temperature measurement sensor.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: January 17, 2012
    Assignees: Nusensors, Inc., University of Central Florida
    Inventors: Nabeel Agha Riza, Frank Perez
  • Patent number: 8035822
    Abstract: An optical sensing probe includes a tube having a tip portion configured for placement in an environment in which conditions are to be sensed and an etalon having a known characteristic disposed proximate the tip portion. The tube also includes a head portion remote from the tip portion containing a light directing element for directing light beams at the etalon and receiving reflected light beams from the etalon wherein the received reflected light beams are used for determining an environmental condition proximate the tip portion. A method for measuring a thickness of the etalon may include directing a light beams at different frequencies at the etalon and receiving the light beams from the etalon. The method may also include identifying conditions of the respective light beams condition received from the etalon and then calculating a first thickness of the etalon responsive to the respective conditions and the known characteristic.
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: October 11, 2011
    Assignee: Nusensors, Inc.
    Inventors: Nabeel Agha Riza, Frank Perez
  • Publication number: 20100128284
    Abstract: An optical sensing probe includes a tube having a tip portion configured for placement in an environment in which conditions are to be sensed and an etalon having a known characteristic disposed proximate the tip portion. The tube also includes a head portion remote from the tip portion containing a light directing element for directing light beams at the etalon and receiving reflected light beams from the etalon wherein the received reflected light beams are used for determining an environmental condition proximate the tip portion. A method for measuring a thickness of the etalon may include directing a light beams at different frequencies at the etalon and receiving the light beams from the etalon. The method may also include identifying conditions of the respective light beams condition received from the etalon and then calculating a first thickness of the etalon responsive to the respective conditions and the known characteristic.
    Type: Application
    Filed: January 25, 2010
    Publication date: May 27, 2010
    Inventors: Nabeel Agha Riza, Frank Perez
  • Publication number: 20090296776
    Abstract: Silicon Carbide (SiC) probe designs for extreme temperature and pressure sensing uses a single crystal SiC optical chip encased in a sintered SiC material probe. The SiC chip may be protected for high temperature only use or exposed for both temperature and pressure sensing. Hybrid signal processing techniques allow fault-tolerant extreme temperature sensing. Wavelength peak-to-peak (or null-to-null) collective spectrum spread measurement to detect wavelength peak/null shift measurement forms a coarse-fine temperature measurement using broadband spectrum monitoring. The SiC probe frontend acts as a stable emissivity Black-body radiator and monitoring the shift in radiation spectrum enables a pyrometer. This application combines all-SiC pyrometry with thick SiC etalon laser interferometry within a free-spectral range to form a coarse-fine temperature measurement sensor.
    Type: Application
    Filed: May 19, 2009
    Publication date: December 3, 2009
    Inventors: Nabeel Agha Riza, Frank Perez
  • Publication number: 20080297808
    Abstract: An optical sensing probe includes a tube having a tip portion configured for placement in an environment in which conditions are to be sensed and an etalon having a known characteristic disposed proximate the tip portion. The tube also includes a head portion remote from the tip portion containing a light directing element for directing light beams at the etalon and receiving reflected light beams from the etalon wherein the received reflected light beams are used for determining an environmental condition proximate the tip portion. A method for measuring a thickness of the etalon may include directing a light beams at different frequencies at the etalon and receiving the light beams from the etalon. The method may also include identifying conditions of the respective light beams condition received from the etalon and then calculating a first thickness of the etalon responsive to the respective conditions and the known characteristic.
    Type: Application
    Filed: December 6, 2006
    Publication date: December 4, 2008
    Inventors: Nabeel Agha Riza, Frank Perez
  • Publication number: 20080192803
    Abstract: Two new techniques to form extreme environment minimally invasive freespace targeted optical temperature sensors using preferably single crystal Silicon Carbide (SiC) optical sensor chips. One technique uses wavelength signal processing exploiting the SiC chip's quadratic nature of its Thermo-optic effect. The other sensing method uses spatial signal processing while utilizing the temperature dependent Snell's law effect. A unique multi-sensor temperature measurement system is described using optical switching, fiber-remoting, and wavelength controls.
    Type: Application
    Filed: October 24, 2007
    Publication date: August 14, 2008
    Inventors: Nabeel Agha Riza, Frank Perez
  • Patent number: 7327472
    Abstract: A remote temperature sensing system includes a light source selectively producing light at two different wavelengths and a sensor device having an optical path length that varies as a function of temperature. The sensor receives light emitted by the light source and redirects the light along the optical path length. The system also includes a detector receiving redirected light from the sensor device and generating respective signals indicative of respective intensities of received redirected light corresponding to respective wavelengths of light emitted by the light source. The system also includes a processor processing the signals generated by the detector to calculate a temperature of the device.
    Type: Grant
    Filed: July 20, 2005
    Date of Patent: February 5, 2008
    Assignees: Nusensors, Inc., University of Central Florida
    Inventors: Nabeel Agha Riza, Frank Perez
  • Patent number: 7180602
    Abstract: An agile optical sensor based on spectrally agile heterodyne optical interferometric confocal microscopy implemented via an ultra-stable in-line acousto-optic tunable filter (AOTF) based interferometer using double anisotropic acousto-optic Bragg diffraction. One embodiment uses a tunable laser as the light source while other embodiments use a broadband source or a fixed wavelength laser as the source. One embodiment uses anisotropic diffractions in an AOTF to generate two near-collinear orthogonal linear polarization and slightly displaced beams that both pass via a test sample to deliver highly sensitive sample birefringence or material optical retardation measurements. A spherical lens is used to form focused spots for high resolution spatial sampling of the test object. The laser and AOTF tuning allows birefringence measurements taken at different wavelengths, one at a time.
    Type: Grant
    Filed: December 10, 2004
    Date of Patent: February 20, 2007
    Assignees: Nuonics, Inc., University of Central Florida
    Inventors: Nabeel Agha Riza, Frank Perez, Amana Bokhari
  • Patent number: 7092079
    Abstract: An agile optical beam profiler using a two-dimensional small tilt digital micromirror device/chip, a translation stage, and single photodetector or pair of photodetectors. A method of profiling an optical beam includes positioning a programmable spatial light modulator in an incident optical beam and sequentially moving the spatial light modulator to at least one position in a first planar direction in a displacement increment less than a pixel width of the spatial light modulator. The method also includes directing respective portions of the optical beam to a photodetector at each position of the spatial light modulator. The method may also include calibrating the photodetectors by directing a portion of the beam to the photodetector, then directing the entire beam, or a remaining portion of the beam, to the photodetector, and normalizing the detected power of the portion with the detected power of the entire beam, or remaining portion, respectively.
    Type: Grant
    Filed: September 8, 2003
    Date of Patent: August 15, 2006
    Assignee: Nuonics, Inc.
    Inventors: Nabeel Agha Riza, Muhammad Junaid Mughal
  • Patent number: 6982818
    Abstract: Electronically agile optical filtering modules for equalizing light propagation differences in at least two spaced optical beam pathways in the modules. The modules use optical polarization rotation devices that may include acousto-optic tunable filter (AOTF) devices, liquid crystal devices, and magneto-optic devices. Such devices may be subject to polarization dispersion losses (PDL) and polarization mode dispersion (PMD) that may be different for when light travel along different light paths through the device. By redirecting light beams back along a different bi-directional path through the devices which may exhibit non-uniform performance across orthogonal polarizations, PDL and PMD may be reduced.
    Type: Grant
    Filed: October 10, 2003
    Date of Patent: January 3, 2006
    Assignee: Nuonics, Inc.
    Inventors: Nabeel Agha Riza, Muhammad Junaid Mughal
  • Patent number: 6922233
    Abstract: An optical beam profiler using a spatial light modulator and photodetector. In an embodiment, the spatial light modulator is a two-dimensional (2-D) small tilt digital micromirror device. The profiler features fast speed, digital controls, low polarization sensitivity, and high measurement repeatability. The 2-D multi-pixel device-based profiler allows the use of several beam profile measurement concepts including moving knife edge, scanning slit, moving pinhole, variable aperture, and 2-D photodiode array. The proposed digital optical beam profiler can be implemented with any type of digitally operated 2-D spatial light modulator device such as using liquid crystals, magneto-optics, multiple quantum wells, electro-optic polymers, and photonic crystals.
    Type: Grant
    Filed: February 7, 2003
    Date of Patent: July 26, 2005
    Assignee: Nuonics, Inc.
    Inventor: Nabeel Agha Riza
  • Patent number: 6885807
    Abstract: Unique multi-diffraction structures using electronically controlled Bragg diffraction devices such as acousto-optic (AO) devices to accomplish optical beam attenuation control functions. These variable optical attenuator (VOA) modules can be fully inertialess as they can use electronically programmable sub-microsecond speed AO devices to implement optical gain controls. These VOAs deliver desirable capabilities in one optically reversible unit, making high dynamic range, low loss, high power handling, ultra-fast, high optical isolation, broadband operation, self-aligning robust modules. These VOAs can be made essentially independent of the optical polarization of the incident light by the use of a unique fixed waveplate compensation technique within the VOA configuration that suppresses polarization dependent loss. Broadband gain control operation over several wavelengths can be achieved by controlling the frequency and electrical drive power of the chosen frequencies feeding the acousto-optic devices.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: April 26, 2005
    Assignee: Nuonics, Inc.
    Inventor: Nabeel Agha Riza
  • Patent number: 6859578
    Abstract: Multi-wavelength fiber-optic processors based on a fault-tolerant scheme using a macro-pixel to control an optical beam are described. The macro-pixel system uses multiple device pixels per beam to provide a robust digital technique for amplitude control and routing, enabling a module with high optical beam alignment tolerance and resistance to catastropic failure. In one embodiment, the macropixel is implemented via small tilt micromirrors fabricated via optical microelectromechanical systems (MEMS) technology. The system includes fault tolerant fiber-optic processors that can implement add-drop wavelength routing, optical power level conditioning per wavelength, 2×2 optical crossconnects, and 1×N and M×N type broadcast-gain controlled switches. The system can simultaneously and independently implement optical power conditioning and wavelength routing for any wavelength channel.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: February 22, 2005
    Assignee: Nuonics, Inc.
    Inventor: Nabeel Agha Riza
  • Publication number: 20040125361
    Abstract: An agile optical beam profiler using a two-dimensional small tilt digital micromirror device/chip, a translation stage, and single photodetector or pair of photodetectors. A method of profiling an optical beam includes positioning a programmable spatial light modulator in an incident optical beam and sequentially moving the spatial light modulator to at least one position in a first planar direction in a displacement increment less than a pixel width of the spatial light modulator. The method also includes directing respective portions of the optical beam to a photodetector at each position of the spatial light modulator. The method may also include calibrating the photodetectors by directing a portion of the beam to the photodetector, then directing the entire beam, or a remaining portion of the beam, to the photodetector, and normalizing the detected power of the portion with the detected power of the entire beam, or remaining portion, respectively.
    Type: Application
    Filed: September 8, 2003
    Publication date: July 1, 2004
    Inventors: Nabeel Agha Riza, Muhammad Junaid Mughal
  • Patent number: RE42124
    Abstract: Fiber-optic beam routing and amplitude control modules based on a unique fault-tolerant scheme using a macro-pixel to control an optical beam are proposed. The unique macro-pixel method involving multiple device pixels per beam inherently provides a robust digital technique for module control while adding to the optical beam alignment tolerance and resistance to catastropic failure for the overall module. The macropixel approach solves the speed versus alignment and failure sensitivity dilemma present in single pixel element based optical micromechanical systems (MEMS). Specifically proposed are fault tolerant fiber-optic attenuators and switches using several microactuated micromirrors per optical beam. Transmissive and reflective module geometries are proposed using small tilt and small distance piston-action micromirrors, leading to fast module reconfiguration speed fiber optic signal controls. The macro-pixel design approach is extended to other pixel technologies such as polarization rotating pixels.
    Type: Grant
    Filed: April 24, 2003
    Date of Patent: February 8, 2011
    Inventor: Nabeel Agha Riza