A high-frequency dynamic information demodulation system and method based on fiber Bragg grating polarization information detection

Abstract

The invention relates to a high-frequency dynamic information demodulation system and method based on optical fiber grating polarization information detection. The high-frequency dynamic information demodulation system comprises a polarization beam splitter PBS, photoelectric detectors PD1, PD2 and a signal processing module, and is characterized in that the polarization beam splitter PBS is used for receiving optical signal containing pressure information, two signal output ends of the polarization beam splitter PBS are respectively connected to signal input ends of the two photoelectric detectors PD1, PD2, the photoelectric detectors convert the optical signals into electric signals, and signal output ends of the two photoelectric detectors PD1, PD2 are connected with a signal input end of the signal processing module so as to demodulate pressure information. The high-frequency dynamic information demodulation system is simple in structure, low in cost, and capable of demodulating dynamic pressure information. The high-frequency dynamic information demodulation system meets a high-frequency dynamic pressure real-time monitoring requirement.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a pressure sensing system, in particular to an optical fiber sensing method for real-time monitoring of pressure by using the Stokes parameter of the fiber grating transmitted light. Background technique [0002] When the optical fiber is affected by the external environment (temperature, stress, magnetic field, pressure, etc.), the parameters such as the intensity, phase, frequency, and polarization state of the transmitted light in the optical fiber will change accordingly. By detecting these parameters of the transmitted light, the change of the corresponding physical quantity can be known. This technology is called fiber optic sensing technology. [0003] As a mature all-fiber device, fiber grating has very important applications in the fields of optical fiber communication and optical fiber sensing due to its small size, low insertion loss, and easy integration...

AI Technical Summary

Problems solved by technology

Since the analyzer and wave plate currently only have discrete devices and no fiber-optic in-line devices, the collimation of the beam, the precise adjustment of the angle of the polarizer and wave plate, and the integration of the device have very strict requirements on the process and packaging. The process technology is monopolized by foreign countries, and the cost is relatively expensive

At the same time, the polarization test card of foreign companies adopts non-terminal test method, which limits the bandwidth and makes it difficult to expand the bandwidth

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