Photonic crystal fiber transverse stress sensor based on temperature compensation

A photonic crystal fiber and lateral stress technology, applied in the field of optical sensing methods and sensors, can solve problems such as interference of measurement results, and achieve the effects of reducing cross-sensitivity, improving sensitivity, and high sensitivity

Active Publication Date: 2018-09-21
CHINA UNIV OF MINING & TECH
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Problems solved by technology

In addition, during the measurement process, the ambient temperature will interfere with the measurement results

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  • Photonic crystal fiber transverse stress sensor based on temperature compensation
  • Photonic crystal fiber transverse stress sensor based on temperature compensation
  • Photonic crystal fiber transverse stress sensor based on temperature compensation

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[0018] In order to make the technical problems solved by the present invention, technical solutions and beneficial effects clearer, the following in conjunction with the appended Figure 1-7 The specific structure, principle and experimental process of the present invention are further described in detail. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] The present invention proposes a photonic crystal fiber transverse stress sensor based on temperature compensation, the structural diagram is as follows figure 1 As shown in (4), the supporting experimental device includes a broadband light source device (1), a transverse stress sensing part (2), and a spectrum analyzer (3). The lateral stress sensing part (2) is composed of a sensor and a lateral external force applying device. Two single-mode optical fibers are welded at both ends of the sensor. These two single-...

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Abstract

The invention provides a photonic crystal fiber transverse stress sensor based on temperature compensation. Four super-large side holes in cross distribution are introduced in an optical fiber cladding layer; each side hole is internally coated with a gold nanofilm, and one side hole is filled with magnetic fluid; and small air holes are distributed in the cladding layer in an octagonal manner. The sensor realizes high-sensitivity transverse stress sensing in any direction. A measurement device thereof comprises a light source portion, a transverse stress sensor portion and a demodulation portion. The sensor combines the super-large side holes with surface plasma technology, thereby greatly improving the sensitivity of the transverse stress sensor. Magnetic fluid filling causes Y polarization fundamental mode loss peak to have double peaks, brings new degree of freedom and realizes temperature compensation. Through a multi-parameter demodulation and orthogonal decomposition method, measurement of transversal stress in any direction is realized. The result shows that, under the transversal stress, fundamental mode X polarization maximum sensitivity is 3.4 nm / N, and Y polarization maximum sensitivity is 4.6 nm / N. The sensor is simple in structure, high in sensitivity, small and compact, and is suitable for accurate measurement of transversal stress in multiple fields.

Description

technical field [0001] The invention relates to an optical sensing method and a sensor, in particular to a photonic crystal fiber optic stress sensor based on temperature compensation. The invention utilizes the property that the spectral characteristics of the large-hole photonic crystal fiber are easily affected by external stress, and combines the magnetic fluid filling and surface plasmon resonance technology to design a temperature-compensated photonic crystal fiber transverse stress sensor to monitor the external stress. Background technique [0002] Photonic Crystal Fibers (PCF, Photonic Crystal Fibers) have attracted extensive attention from researchers due to their special optical properties. With the development and progress of manufacturing technology, PCF-based sensors are widely used in various aspects of strain or temperature monitoring. However, many studies on strain sensing focus on the longitudinal component, and the transverse component is difficult to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24G01L1/26G01L5/16
CPCG01L1/242G01L1/26G01L5/16
Inventor 刘海王晴朱晟昦谭策程德强李宏伟王猛丁毅潘红帅王琰
Owner CHINA UNIV OF MINING & TECH
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