Patents by Inventor Shiro Takahasi

Shiro Takahasi 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).

  • Fiber Bragg grating sensor
    Patent number: 7702190
    Abstract: An optical fiber strain sensor, a method of fabricating the same, and a method of sensing strain (1200). The method of strain sensing comprises providing an optical fiber having at least a first fiber Bragg grating (FBG) and a second FBG formed therein (1202); subjecting the optical fiber to a strain inducing force such that a grating period in the first FBG compresses and a grating period in the second FBG extends (1204); and optically interrogating the first and second FBG to determine peak reflection wavelengths of the first and second FBGs respectively (1206), whereby a separation between the peak reflection wavelengths of the first and second FBGs is representative of the strain induced.
    Type: Grant
    Filed: April 5, 2006
    Date of Patent: April 20, 2010
    Assignee: Agency for Science, Technology and Research
    Inventors: Jianzhong Hao, Jun Hong Ng, Shiro Takahasi