Mode interference annular cavity optical fiber laser sensor

Abstract

The invention relates to a mode interference annular cavity optical fiber laser sensor. The mode interference annular cavity optical fiber laser sensor comprises a pumping source, a wavelength division multiplexer, a rare earth doped active optical fiber, an output coupler, a polarization controller, a multimode optical fiber, an optical fiber isolator and a single-mode transmission optical fiber. A sensing probe is formed by packaging a mode interference structure formed by the multimode optical fiber and the single-mode optical fiber, and the mode interference structure is used as a filtering element of the annular cavity optical fiber laser sensor and meanwhile responds to physical quantities of external displacement, external temperature, external strain and the like. When various physical quantities act on the sensor, the output wavelength and the output power of the laser sensor can drift, sensing information is acquired by detecting the laser output wavelength ad the laser output power, and the physical quantities can be measured in a high precision mode. The mode interference annular cavity optical fiber laser sensor is easy to manufacture and package, low is cost, high in signal to noise ratio and unit bandwidth power, and free of the temperature strain cross sensitivity influence, and can reliably work.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, relates to fiber optic laser sensing and other aspects, is related to fiber optic sensors, tunable fiber lasers, fiber optic filters, etc., and relates to the design and manufacture of a new fiber optic laser sensor. The fiber optic laser sensor involved in the present invention It is suitable for measuring various physical quantities such as displacement, temperature and strain. Background technique [0002] The fiber laser sensor organically combines the fiber sensor and the fiber laser, so that it not only has the advantages of optical fiber as the transmission medium of light and the "transmission and sensing" of the sensitive medium, but also has a high output signal-to-noise ratio. , narrow line width, low noise, high power per unit bandwidth, without broadband light source, can achieve high sensitivity, high resolution and high precision sensing, and has incomparable advantages in ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of temperature and strain cross-sensitivity of fiber grating laser sensors in the background technology, and the inability of mode interference fiber sensors to be applied to high-precision and high-resolution sensing applications, the purpose of the present invention is to design and prepare a new type of mode Interference ring cavity fiber laser sensor, the mode interference fiber structure composed of multimode fiber and single-mode fiber connected on both sides is used as the mode selection element of the fiber laser resonator, and at the same time as the external physical quantity sensitive element, making a high signal-to-noise ratio, high Functional fiber laser sensor with high precision and no temperature-strain cross-sensitivity

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