AWG (Array Waveguide Grating) differential demodulation based intensity detection type PCF-LPG (Long-Period Grating Written in a Photonic Crystal Fiber) stress sensor and device
A technology of PCF-LPG and stress sensor, 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, and eliminate the light source dithering effect
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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 type PCF-LPG stress sensor and device based on AWG differential demodulation includes broadband light source 1, PCF-LPG2, AWG3, photoelectric conversion and signal processing unit 4. The two ports of PCF-LPG2 are respectively optically connected to the broadband light source 2 and the incident end of AWG3, and the second and eighth channels of AWG3 are two outgoing ports to optically connect to the photoelectric converter and signal processing unit 4.
[0016] The working mode of this embodiment is: the light emitted by the broadband light source is incident on the sensing element PCF-LPG, and through the action of the sensing element PCF-LPG, the transmitted light of the sensing element PCF-LPG is incident on the AWG, and the outgoing light of the AWG enters the Photoelectric conversion and signal processing u...
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