Patents by Inventor The-mahn Nguyen

The-mahn Nguyen 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).

  • System and method for compensating for non-linear response characteristic in phase-shifting deflectometry
    Patent number: 11255662
    Abstract: The present disclosure is directed to a system and a method for compensating non-linear response characteristics in measuring the shape of an object using phase-shifting deflectomerty. More particularly, the present disclosure is directed to a method for compensating non-linear response characteristics in phase-shifting deflectometry including steps of: generating a pattern by a pattern generating portion and projecting the same to a measurement object; obtaining an image of a deformed pattern reflected from the measurement object by a detector; linearizing non-linear responses on the basis of a look up table considering non-linear response characteristics of the pattern generating portion and the detector by a compensation means; and compensating phase-shifting amounts generated due to non-linear response characteristics by the compensation means.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: February 22, 2022
    Assignee: Korea Research Institute of Standards and Science
    Inventors: Young-sik Ghim, The-mahn Nguyen, Hyug-gyo Rhee
  • SYSTEM AND METHOD FOR COMPENSATING FOR NON-LINEAR RESPONSE CHARACTERISTIC IN PHASE-SHIFTING DEFLECTOMETRY
    Publication number: 20210172731
    Abstract: The present disclosure is directed to a system and a method for compensating non-linear response characteristics in measuring the shape of an object using phase-shifting deflectometry. More particularly, the present disclosure is directed to a method for compensating non-linear response characteristics in phase-shifting deflectometry including steps of: generating a pattern by a pattern generating portion and projecting the same to a measurement object; obtaining an image of a deformed pattern reflected from the measurement object by a detector; linearizing non-linear responses on the basis of a look up table considering non-linear response characteristics of the pattern generating portion and the detector by a compensation means; and compensating phase-shifting amounts generated due to non-linear response characteristics by the compensation means.
    Type: Application
    Filed: August 14, 2018
    Publication date: June 10, 2021
    Applicant: Korea Research Institute of Standards and Science
    Inventors: Young-sik Ghim, The-mahn Nguyen, Hyug-gyo Rhee