AWG (Array Waveguide Grating) differential demodulation based intensity detection type PCF-LPG (Long-Period Grating Written in a Photonic Crystal Fiber) stress sensor
A technology of photonic crystal fiber and waveguide array grating, which is applied in the measurement of the change force of the optical properties of the material when it is stressed, can solve the problem of low precision of the demodulation unit, improve the sensitivity, reduce the cost of the sensor, eliminate The effect of light source dithering
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[0014] The present invention will be further described below in conjunction with the accompanying drawings.
[0015] Such as figure 1 As shown, the intensity detection photonic crystal fiber long-period grating stress sensor based on differential demodulation of waveguide array grating includes broadband light source 1, photonic crystal fiber long-period grating 2, waveguide array grating 3, photoelectric conversion and signal processing unit 4. The two ports of the photonic crystal fiber long-period grating 2 are optically connected to the broadband light source 2 and the incident end of the waveguide array grating 3, and the second channel and the eighth channel of the waveguide array grating 3 are two output ports connected to the photoelectric converter and signal The processing unit 4 is optically connected.
[0016] The working mode of this embodiment is: the light emitted by the broadband light source is incident on the photonic crystal fiber long-period grating of the...
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