Patent ID: 7170590

Claim:
A distribution optical fiber sensor system, comprising: an optical fiber for sensing to be placed on an object to be measured, a light source for emitting a first pulse light having a pulse width longer than a transient response of an acoustic phonon and emitting a second pulse light in succession to the first pulse after a time interval during which the vibration of the acoustic phonon is substantially maintained to supply the first and second pulse lights to the optical fiber, a detector for detecting a scattering gain spectrum of a Brillouin-scattered light created in the optical fiber by the second pulse light at time intervals corresponding to twice the time obtained by equally dividing the pulse width of the second pulse light, and a calculator for calculating a distortion and/or a temperature based on the respective scattering gain spectra at the respective time intervals for small sections of the optical fiber corresponding to the respective scattering gain spectra at the respective time intervals.