Patents by Inventor Youngjoo Hong

Youngjoo Hong 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: 9354038
    Abstract: In an embodiment, a computer 16, which generates tomographic images based on spectral interference signals detected by a light detector 15 from overlaid reference light emitted by a swept-source type light source 2 of a SS-OCT, split, and then reflected by a fixed reference mirror 8 on one hand and object light reflected by an object to be measured 6 on the other, is caused to function to apply rough correction using a first correction means and then apply detailed correction using a second correction means, to stabilize the phases of the SS-OCT. The phases can be stabilized by eliminating, without adding any expensive, complex hardware, the jitter between the wavelength scanning of a light source of SS-OCT and the timing of collecting the scan data with the light detector as spectral interference signals.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: May 31, 2016
    Assignee: UNIVERSITY OF TSUKUBA
    Inventors: Yoshiaki Yasuno, Masahide Itoh, Youngjoo Hong
  • Publication number: 20150009507
    Abstract: In an embodiment, a computer 16, which generates tomographic images based on spectral interference signals detected by a light detector 15 from overlaid reference light emitted by a swept-source type light source 2 of a SS-OCT, split, and then reflected by a fixed reference mirror 8 on one hand and object light reflected by an object to be measured 6 on the other, is caused to function to apply rough correction using a first correction means and then apply detailed correction using a second correction means, to stabilize the phases of the SS-OCT. The phases can be stabilized by eliminating, without adding any expensive, complex hardware, the jitter between the wavelength scanning of a light source of SS-OCT and the timing of collecting the scan data with the light detector as spectral interference signals.
    Type: Application
    Filed: December 14, 2012
    Publication date: January 8, 2015
    Applicant: UNIVERSITY OF TSUKUBA
    Inventors: Yoshiaki Yasuno, Masahide Itoh, Youngjoo Hong
  • Patent number: 8237925
    Abstract: The present invention relates to a prism for inducing Brewster's angle transmission and a fluorescence detection apparatus for enhancing a signal-to-noise ratio using thereof, and more specifically, to a prism for inducing Brewster's angle transmission and a fluorescence detection apparatus for enhancing a signal-to-noise ratio using thereof, in which evanescent waves are generated when light is cast onto fluorescence material applied on a sample surface at an angle greater than a critical angle, and the evanescent waves are used as excitation light of fluorescence to induce total internal reflection of the light so that the light may pass through the prism at a Brewster's angle. Therefore, effects of the re-reflected light on the sample surface are removed, and a signal-to-noise ratio (SNR) is improved at the same time. In addition, the prism is miniaturized, and therefore, usage of the sample area and efficiency of the light amount are improved.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: August 7, 2012
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Youngjoo Hong, Jeongho Ahn, Hyojun Park, Hyungchul Lee, Sungyoon Ryu, Wonsik Kwon, Soohyun Kim
  • Publication number: 20100225915
    Abstract: The present invention relates to a prism for inducing Brewster's angle transmission and a fluorescence detection apparatus for enhancing a signal-to-noise ratio using thereof, and more specifically, to a prism for inducing Brewster's angle transmission and a fluorescence detection apparatus for enhancing a signal-to-noise ratio using thereof, in which evanescent waves are generated when light is cast onto fluorescence material applied on a sample surface at an angle greater than a critical angle, and the evanescent waves are used as excitation light of fluorescence to induce total internal reflection of the light so that the light may pass through the prism at a Brewster's angle. Therefore, effects of the re-reflected light on the sample surface are removed, and a signal-to-noise ratio (SNR) is improved at the same time. In addition, the prism is miniaturized, and therefore, usage of the sample area and efficiency of the light amount are improved.
    Type: Application
    Filed: October 14, 2009
    Publication date: September 9, 2010
    Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Youngjoo Hong, Jeongho Ahn, Hyojun Park, Hyungchul Lee, Sungyoon Ryu, Wonsik Kwon, Soohyun Kim