Brillouin distributed optical fiber sensing system

Abstract

The invention discloses a Brillouin distributed optical fiber sensing system which comprises Brillouin scattering light (1), a photoelectric detector (2), a signal preprocessing circuit (3), a high speed AD collecting circuit (4), an arbitrary coded pulse circuit (5), an acousto-optic driver (6), a data storage circuit (7), a microwave source (8), a microwave frequency sweeping control circuit (9), an FPGA logic control circuit (10), an ARM and upper computer interface circuit (11) and an upper computer (12). The Brillouin distributed optical fiber sensing system provides coded pulse drive signals needed by a Brillouin optical time domain analysis meter, and carries out collection and processing on the Brillouin scattering optical signals generated by an optical subsystem, temperature and strain information is demodulated from the Brillouin scattering optical signals, and the Brillouin distributed optical fiber sensing system is strong in pertinence, high in integration level and low in cost, and achieves high measuring accuracy and long measuring distance.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing system, in particular to a Brillouin distributed optical fiber sensing system, which is an integrated signal processing platform suitable for a long-distance, high-resolution distributed optical fiber sensing system. Background technique [0002] Worldwide, due to the continuous improvement in the safety and efficiency requirements of industrial facilities, the demand for integrated safety detection systems is gradually rising. Although point-type and quasi-distributed optical fiber sensing technology has high spatial resolution, short measurement time, and strong signal, it has a strong affinity for continuous, uninterrupted, long-distance measurement and the measured medium. It is relatively weak, and it does not have the characteristics of combining transmission and sensing media into one. [0003] In order to improve the measurement accuracy and measurement distance of the distribute...

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Problems solved by technology

[0003] In order to improve the measurement accuracy and measurement distance of the distributed temperature measurement system, the pulsed light can be encoded to improve the signal-to-noise ratio of the system. This requires a waveform generation card that can generate encoding, and cooperate with the data acquisition card for data acquisition. However, Since the general-purpose waveform generation card needs computer software above the PC to control, the loading and output of the waveform file is not real-time, and when used in conjunction with the data acquisition card, it cannot perform synchronously encoded pulse trains well, so the general-purpose arbitrary waveform is used The structure of the generation card is complex, and most of them adopt the DDS principle, so it is necessary to configure SRAM as code storage, and high-speed DA as analog waveform generation, and the cost is high

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