Multi-parameter measuring device based on double-clad optical fiber

Abstract

The invention provides a multi-parameter measuring device based on a double-clad optical fiber. The device comprises a light source 1, a single-mode optical fiber 2, a polarizer 3, a polarization controller 4, the double-clad optical fiber 5 with a tilted grating 6 and a signal demodulator 7 which are connected in sequence. The double-clad optical fiber is provided with an inner cladding and an outer cladding, and the tilted grating is engraved on a fiber core. Light emitted by the light source forms a comb-shaped transmission spectrum after passing through the tilted grating, and the transmission spectrum comprises a Bragg resonance peak, an inner cladding resonance peak and an outer cladding resonance peak. When the external environment of the tilted grating changes, the transmission spectrum of the tilted grating changes, and real-time detection of parameters such as temperature, bending, axial strain and refractive index is realized by monitoring the changes of the wavelength and intensity of the resonance peaks, which has the advantages of small size, quick response, high sensitivity and the like.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows for simultaneous measurements of temperatures, bends, or refraction indices from different angles with minimal interferement between them. It uses two types of fibers - one made up mostly glass material called dual-clads – that transmit light signals through their cores without any distortion caused by other materials inside it's structure. These devices have excellent properties including low cost, good heat stability during use, resistant against chemical agents used in environments where they may be exposed over an extended period of time (up to several months). They also provide quicker responses than existing methods due to its smaller dimensions and higher sensitivities compared to traditional techniques.

Problems solved by technology

This patented technical solution describes different ways for measuring temperatures or other properties from fibers by utilizing special techniques like bending radar waves into them instead of relying solely upon reflection off surfaces. These techniques allow for precise measurements without being affected by interference factors outside the sensor's own enclosure (the device). Additionally, this technique allows for flexibility in producing specific structures based on desired characteristics.

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