Optical fiber sensing method, optical fiber sensing device and using method of optical fiber sensing device

Abstract

The invention discloses an optical fiber sensing method, an optical fiber sensing device and a using method of the optical fiber sensing device. In the optical fiber sensing method disclosed by the invention, a transmission function curve of an optical fiber grating is obtained by adopting a method for ensuring an optical single side band sweep frequency signal modulated by a microwave sweep frequency signal to pass through the optical fiber grating. The optical fiber sensing device disclosed by the invention comprises a microwave sweep frequency source, a narrow linewidth laser, a broadband single side band modulator, a narrow-band optical fiber grating sensor, an optical detector, a microwave amplitude-phase information extraction module, a data processing control module and a display module. The invention also discloses the using method of the optical fiber sensing device. Compared with the prior art, the optical fiber sensing method and the optical fiber sensing device have high sensing accuracy and large measurement range and the distributed sensing can be implemented by adopting a mode that a plurality of narrow-band optical fiber gratings with different stop-band center wavelengths are cascaded.

Description

technical field [0001] The invention relates to an optical fiber sensing method and an optical fiber sensing device, in particular to an optical fiber sensing method and an optical fiber sensing device based on a narrowband fiber grating, and belongs to the technical fields of optical fiber sensing and microwave photonics. Background technique [0002] Optical fiber sensing is to send the light from the light source into the sensing device through the optical fiber, and the sensing device changes the optical properties of the transmitted light (such as light intensity, wavelength, frequency, phase, polarization state, etc.) according to the parameters to be measured, and then analyzes The optical properties of the light passing through the sensing device are reversed to obtain the parameters to be measured. Optical fiber sensing has the advantages of high sensitivity and wide application range, but its measurement accuracy largely depends on the accuracy of optical detection...

AI Technical Summary

Problems solved by technology

[0004] Limited by the fineness of the Fabry-Perot interferometer (generally less than 1000) and the scan step size (generally greater than 7.5MHz), the detection accuracy of the light wavelength of the device is not high, so the sensing accuracy is poor and the measurement range is limited. limit

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