Multi-type fiber bragg grating sensor system

Abstract

A multi-type Fiber Bragg Grating Sensor System adapted to use on inclined chirped grating filter and to discharge light at a predetermined period of interval, enabling to accurately detect at one time wavelength variation amount of light signals reflected from the multiple FBG sensors, the system comprising: a light emitting diode driving unit for driving a light emitting diode in response to a timing signal produced therein to prompt the light emitting diode to repeatedly emit light signals; multiple FBG sensors for receiving the light signals emitted from the light emitting diode via a light coupler to reflect the light which changes its center wavelength according to externally-applied physical properties changes; an inclined chirped grating filter for allowing the light signals respectively reflected from each FBG sensors to pass the different amount of luminous intensity according to the center wavelength change; first detector for detecting the luminous intensity of each light signal having passed the inclined chirped grating filter; second detector for detecting luminous intensity of each light signal reflected from the FBG sensor; divider for dividing the luminous intensity detected by the first detector by the luminous intensity detected by the second detector; and a controller for storing a luminous intensity variation rate (n) currently input from the divider and comparing with a variation rate (n−1) priorly input to obtain a value of wavelength change based on the difference between them and to calculate physical properties variations applied to each FBG sensor in response to the wavelength change.

Dependencies are inferred from the claim text.