Monitoring device for evaluating reinforcing effect of pipeline

The utility model relates to a monitoring device for evaluating reinforcing effect of the pipeline. Two optical fiber probes of the optical fiber sensor is connected with the portable demodulation instrument through a 3dB optical coupler A. The optical fiber with fixed length and the optical fiber with adjustable length for the portable demodulation instrument is connected with a 3db optical coupler B. The optical fiber with adjustable length is connected with a micro-displacement modulator, the 3dB optical coupler is connected with an optical receiving interface and a photoelectric detector. A LED is connected with an optical sending interface. The photoelectric detector, a pre-amplifier, a filter, a A/D converter and an interior data processor are connected in sequence. The interior data processor is respectively connected with a data analyzing and collecting system and the micro-displacement modulator. The device has high interference resistance, low requirements to the light source and demodulation, and f