Pulse coding fiber Brillouin optical time domain analyzer

Abstract

The invention discloses a pulse coding fiber Brillouin optical time domain analyzer which comprises a pulse coding waveform generator, a narrow-band single-frequency fiber laser, a fiber shunt, an optical pulse coding modulator, two fiber circulators, an heterodyne receiver, a digital signal processor, a fiber bragg grating filter, a sensing fiber, a fiber Raman pump sensor and an industrial personal computer. The sensor adopts a time sequence to code laser pulse to improve the spatial resolution by reducing laser width while the transmission photon number is improved; a continuously operated fiber Raman pump laser serves as a pump light source to overcome the difficulty that the Brillouin optical time domain analyzer needs to strictly lock the frequency of a detection laser and a pump laser; and strong laser generated by the continuously operated fiber Raman pump laser is amplified by stimulated Raman scattering light in a sensing fiber instead of being amplified by the narrow-band Brillouin, the gain of the back coherent amplification stimulated Brillouin scattering can be increased, the signal to noise ratio is improved, the measurement precision is improved, and the measurement length is increased.

Description

Technical field [0001] The present invention involves pulse encoding optical fiber Boriyuan time domain analyzer, which is a distributed fiber sensor technology field. Background technique [0002] In the field of optical fiber Boriyuan time domain analysis, optical fiber Boriyuan time domain reflector 釆 uses the optical fiber's spontaneous Buryyuan scattering, so it is weak to the back of the Boriyuan scattering signal.The accuracy of frequency and intensity is very low to measure the accuracy of the shouldbids and temperature, the process is short, and the space resolution is low.T.Horiguchi and others invented the Bourry Optical Domain analyzer, adding a related pump laser to the other end of the fiber to achieve Bouri amplification.System signal -to -noise ratio.However, the frequency of the optical fiber Boriyuan time domain analysis requires the frequency of the narrowband detection laser and the narrowband pump laser, which is technically difficult.In recent years, the saf...

AI Technical Summary

Problems solved by technology

However, the fiber Brillouin optical time-domain analyzer requires strictly locking the frequencies of the narrow-band probe laser and the narrow-band pump laser, which is technically difficult

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