Patents by Inventor Yoshiyasu Matsumura

Yoshiyasu Matsumura 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: 4773753
    Abstract: A fiber sensor for measuring temperature or strain comprises a first polarization-maintaining fiber and a second polarization-maintaining fiber. In case of a temperature fiber sensor, the first and second fibers are selected to be unequal in change in phase difference caused by change in temperature but equal in change in phase difference caused by strain. In case of a strain fiber sensor, the first and second fibers are selected to be unequal in change in phase difference caused by strain but equal in change in phase difference caused by change in temperature. Axes of polarization of the first and second fibers are shifted by 90.degree. at a junction of the fibers. With this arrangement, the temperature fiber sensor can measure the change in temperature with high accuracy without being affected by strain, while the strain fiber sensor can measure the strain with high accuracy without being affected by the change in temperature.
    Type: Grant
    Filed: August 26, 1986
    Date of Patent: September 27, 1988
    Assignee: Daiichi Denshi Kogyo Kabushiki Kaisha
    Inventors: Takao Hirose, Yoshiyasu Matsumura