The University of Tokyo

Fuji Jukogyo Kabushiki Kaisha

Subaru Corporation

Qi Wu

Hideki Soejima

Yoji Okabe

Koji Omichi

Ryujiro Nomura

A vibration detection apparatus includes a ring laser resonator, a fiber Bragg grating and a detection system. The ring laser resonator generates a laser beam propagating a ring shaped optical path. The fiber Bragg grating is disposed in the ring laser resonator such that the laser beam enters the grating, and has a transmittance distribution characteristic of transmitted light in a wavelength direction, which changes in accordance with vibration of an object. The detection system detects the vibration based on the transmitted light through the fiber Bragg grating.

Vibration detection apparatus and vibration detection method

Displacement measuring device with light irradiation system, first and second FBGs and detecting system. The first FBG has first transmittance distribution or first reflectance distribution. The second FBG has second transmittance distribution or second reflectance distribution. The detecting system detects light passed through the first and second FBGs of which at least one of the first transmittance distribution and the second transmittance distribution changes in a wavelength direction with a change amount different from that of the other, according to a displacement amount of an object, or amplitude of the light passed through the first and the second FBGs of which at least one of the first reflectance distribution and the second reflectance distribution changes in the wavelength direction with a change amount different from that of the other, according to the displacement amount of the object, and acquires an index to indicate the displacement amount based on the amplitude.

Displacement measuring device and displacement measuring method

Growing community of inventors

Tokyo, Japan

Qi Wu