Optical fiber sensing device for optical fiber chaos laser device and method thereof

Abstract

The invention relates to an optical fiber sensing device for an optical fiber chaos laser device and a method thereof. The device comprises the optical fiber chaos laser device, a data processing system and an optical fiber sensing system. After chaos light emitted by a wavelength frequency-sweeping filter in the optical fiber chaos laser device enters into an optical fiber coupler, one path of the chaos light enters into the data processing system through a photoelectric detector, the other path of the chaos light enters into the optical fiber sensing system through a light circling device, is reflected back to the light circling device and enters into the photoelectric detector and the data processing system, and then the two paths of data signals are combined through a correlation method and a fiber grating sensor, thereby performing the temperature and pressure measurement and the network monitoring. In the invention, an optical fiber laser device is combined with the fiber grating sensor, a sensing information position of a detecting point is confirmed according to the wavelength frequency sweeping and the chaos related characteristics, and the chaos pulse wavelength frequency sweeping is utilized to realize the accurate measurement for the pressure or temperature of the position of the fiber grating.

Description

Technical field [0001] The invention relates to a chaotic optical fiber sensing device and a method thereof, in particular to a chaotic laser using a wavelength swept frequency generated by a fiber laser for an optical fiber sensing device and a method thereof, which can be used for temperature and pressure sensing measurement and network monitoring And other fields. Background technique [0002] Optical fiber sensing uses optical fiber or fiber grating as the sensing device. Optical fiber sensors are widely used in temperature, pressure, environmental pollution and other fields (EP 2 136 227 A1, US2011 / 0190640, US7684656 B2). Compared with traditional electric sensors, optical fiber sensors have obvious technical advantages such as anti-electromagnetic interference, electrical insulation, corrosion resistance, sensitivity, high weight, light weight, small size, and variable appearance. Optical fiber sensors are easy to reuse and network with the same transmission fiber. The mul...

AI Technical Summary

Problems solved by technology

Using a broadband light source, utilizing the changes in the reflection spectrum and transmission spectrum of the fiber grating and signal processing to realize fiber optic sensing, usually placing fiber gratings with different wavelength reflection or transmittance at a fixed position to realize fiber optic sensing (CN 101813529 A, CN 101813529 A, CN 101216325A), which increases the cost and complexity of the fiber grating fabrication of the system

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