The invention discloses a strain
sensing system based on an ultra short FBG (
fiber bragg
grating) spectrum
linear region, which comprises a frequency stabilized
laser, a
circulator, an ultra short FBGand a
photodiode, wherein one end of the
circulator is connected with one end of the frequency stabilized
laser, and the other end of the
circulator is connected with the ultra short FBG; the
photodiode is used for receiving the reflected light power after a
laser beam reflected back by the ultra short FBG passes through the circulator; the frequency stabilized laser is an 8164A
tunable laser light source, the maximum output power is 8
dBm, the
laser line width is less than 5pm, and the
wavelength stability is less than 1pm. According to the strain
sensing system based on the ultra short FBG spectrum
linear region, light power reflected by an edge
linear region of the ultra short FBG of the laser beam outputted by the frequency stabilized laser is used for
demodulation, the structure is simple, the
power consumption is low, the ultra short FBG is adopted as a sensing element, the problem of
chirp generation during a packaging process due to a long gate area can be avoided, and
high spatial resolution measurement can be realized.