Long-distance point sensing system based on optical fiber random laser

Abstract

The invention discloses a long-distance point sensing system based on an optical fiber random laser. The system comprises a pump laser, a wavelength division multiplexer or a coupler, a long-distance single-mode fiber, wavelength selection devices for sensing, a wavelength selection device for improving random laser generation efficiency, and a wavelength demodulation module. The wavelength division multiplexer or the coupler comprises a 1 port, a public port and a 2 port, wherein the pump laser is connected with the 1 port of the wavelength division multiplexer or the coupler; one end of the long-distance single-mode fiber is connected with the public port of the wavelength division multiplexer or the coupler, and the other end of the long-distance single-mode fiber is connected with the plurality of wavelength selection devices for sensing; and the wavelength demodulation module is connected with the 2 port of the wavelength division multiplexer or the coupler. The system is simple in structure; a complex system framework and expensive devices are not needed in the system; during usage, the pump laser is started and the output power of the pump laser is adjusted to an appropriate range, and thus the long-distance sensing detection quantity can be obtained through the wavelength demodulation module.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a long-distance point sensing system. Background technique [0002] Fiber optic point sensors have many advantages: anti-electromagnetic interference, small size, passive, corrosion-resistant, etc. These characteristics make the fiber optic point sensor have a great range of applications, it can be used in oil wells, natural gas pipelines, tunnels, bridges and other occasions. When long-distance telemetry is required due to objective conditions, such as volcanic eruptions, nuclear radiation and other environmental hazards, or deserts and other inaccessible areas, it is necessary to use various technical means to extract sensing signals remotely. In order to extend the sensing distance, the existing technologies include high-speed frequency-sweeping laser and Raman amplification, active optical fiber remote pumping amplification and other methods. The above impleme...

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Problems solved by technology

The above implementation methods generally require complex system architecture and expensive devices

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