Distributed optical fiber sensing system based on delay reservoir calculation and signal identification and positioning method thereof
A distributed optical fiber and sensing system technology, applied in the direction of calculation, calculation model, computer components, etc., can solve the problems of time-consuming, misjudgment of vibration into different types, inaccuracy, etc., and achieve strong learning ability and modeling ability, Less susceptible to noise and simple processing
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Embodiment 1
[0030] In this example, see figure 1 , a distributed optical fiber sensing system based on reserve pool computing, which consists of an input layer, a reserve pool and an output layer. The input layer has two nodes, one is inputting the excitation signal of the reserve pool, and the other is inputting the external vibration signal; the reserve pool is composed of a delay nonlinear system, and the delay fiber is the sensing fiber; the output layer has two nodes. nodes, one outputs the vibration type and the other outputs the vibration location.
[0031] In this embodiment, the optical fiber delay nonlinear system is used as both a reserve pool and a sensor, and the response of the reserve pool calculation is used to detect the external vibration signal; through the idea of machine learning, that is, the training and testing of the reserve pool calculation, the external vibration Type identification and location determination of signals. There is no need to build an accurate...
Embodiment 2
[0033] This embodiment is basically the same as the first embodiment, and the special features are:
[0034] In this embodiment, the node for inputting the excitation signal of the reserve pool in the input layer is not necessary, that is, there is or does not exist as required.
[0035] In this embodiment, the delay nonlinear system is an all-optical delay form or a photoelectric delay form, and the specific structure requires that it not only has the properties of a storage pool, but also has different responses to different types of external vibrations at different locations.
[0036] Compared with the reserve pool calculation implemented by software, the virtual node state acquisition speed of this embodiment is fast, and therefore, the process of signal identification and positioning is also fast.
Embodiment 3
[0038] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:
[0039] In this example, see figure 2 , using the delayed mutual injection semiconductor laser system to form the storage pool and the distributed fiber optic sensor. Both Laser 1 and Laser 2 are semiconductor lasers without built-in isolators. Two polarization controllers are used to adjust the polarization state of the light injected into the two lasers. A section of fiber connecting the two lasers is used as the sensing fiber, and a phase modulator is inserted into the sensing fiber to simulate the effect of external vibration on the sensing fiber, that is, as the only input node to input external vibration signals. In order to make up for the loss of light on the mutual injection channel and ensure that the two lasers have sufficient mutual injection strength, an optical amplifier is placed in the mutual injection channel. Part of the optical signal is output ...
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