Method and device for integration control of optical fiber sensing system based on FPGA

Abstract

The present invention discloses a method and device for integration control of an optical fiber sensing system based on the FPGA. The method comprises: generating phase modulation signals based on a three-step phase-shifting modulation principle, extracting light intensity data from an appropriate sampling window, calculating a wrapped phase, and calculating an absolute phase position according toa region growing algorithm. The device comprises a photoelectric converter, an analog digital conversion module, an FPGA-based real-time control and data processing module and a phase modulation signal analog conversion circuit. The FPGA-based real-time control and data processing module comprises a phase modulation signal generation unit, a light intensity data extraction unit, a phase calculation unit, a phase unpacking unit and a phase information formatting and communication unit. The integrated control device of the invention has the advantages of high system integration, minimal demandfor functional devices, and significant cost reduction. In addition, because of programmable reconfiguration feature of the FPGA, the device provided by the invention is reconfigurable and flexible, and is high in expansion capability.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to an integrated control method and device for an FPGA-based optical fiber sensing system. Background technique [0002] Optical fiber sensors have many advantages such as light weight, anti-electromagnetic interference, high sensitivity, safety and reliability, corrosion resistance, distributed measurement, and easy networking. They have been used in oil well temperature and pressure measurement, oil pipeline monitoring, logging technology, Seismic wave monitoring, etc. Optical fiber sensors are generally based on the principle of interference, which linearly converts physical parameters such as stress, temperature, and acceleration sensed by the sensing probe into phase changes of the signal arms in the interference arms, and reflects them in the form of interference light intensity fringes. The interference light intensity of the fiber optic sensor is generally con...

AI Technical Summary

Problems solved by technology

These functions require that the electronic devices implementing these functions have the ability of real-time control and calculation of complex floating-point operations. There are many types of functional devices in common systems and they have discrete and dispersed characteristics, so the implementation complexity is high and the cost is high. , has become one of the main limiting factors restricting the manufacture and production of fiber optic sensing systems

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