High-performance dynamic distributed optical fiber sensor based on Brillouin and Rayleigh dual mechanisms
A distributed optical fiber, high-performance technology, applied in the optical field, can solve the problem of high requirements for pump light sources, achieve the effect of improving reliability, reducing requirements, and ensuring output
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Embodiment 1
[0036] The embodiment is basically as attached figure 1 shown, including:
[0037] A laser is used to generate the first light and the second light, and input the first light to the first photoelectric modulator, and input the second light to one end of the optical fiber to be tested;
[0038] The first electro-optical modulator is used to modulate the first light into an optical frequency-agile signal light with upper and lower sidebands;
[0039] The second electro-optic modulator is used to modulate the optical frequency-agile signal light into pulsed light;
[0040] The first filter is used to filter the pulsed light out of the upper sideband;
[0041] Erbium-doped fiber amplifier, which is used to obtain pump light after power amplification after the pulse light filters out the upper sideband;
[0042] a polarization controller for adjusting the polarization state of the pump light;
[0043] A circulator is used to input pump light to the other end of the optical fibe...
Embodiment 2
[0054] The only difference from Embodiment 1 is that the specific structure of the polarization controller is as follows: it includes an optical fiber coil wound on the outer wall of the cylindrical piezoelectric ceramic, the optical fiber coil is a λ / 4 optical fiber coil, and the optical fiber coil is used to adjust the incident pump Pumping light, the cylindrical piezoelectric ceramic adjusts the polarization state of the pumping light under the control of an applied voltage. In this embodiment, a motor is further included, and the motor is used to drive the fiber coil to rotate to a preset position, so that the fiber coil converts incident pump light into pump light output with a preset polarization direction.
Embodiment 3
[0056] The only difference from Embodiment 2 is that the optical fiber is buried in the coal seam to detect whether there is a fault in the coal seam and the specific location of the fault. Prepare a car in advance, which is similar in size to a toy car, and can just load the fiber optic sensor in this solution. The fiber optic sensor is fixed on the trolley with screws or adhesive tape, and the trolley is fixed on the optical fiber, and the clockwork device is used to drive the trolley to move along the optical fiber. In this embodiment, in order to realize the movement of the car driven by the spring, it can be implemented by referring to the principle of the existing clockwork toy car. For example, for the pulling trolley that children often play with, it usually includes the elastic powertrain, frame, axle and wheels. Put the pulling trolley on the ground smoothly, grab the elastic powertrain with your left hand, and pull the pulling wire backwards with your right hand. Q...
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