An electronically controlled and tuned long-period photonic crystal fiber grating temperature sensor

A photonic crystal fiber, temperature sensor technology, used in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve problems such as limiting applications, and achieve improved refractive index sensitivity, high temperature sensitivity and tunability, and enhanced coupling. Effect

Inactive Publication Date: 2020-07-24
NORTHEASTERN UNIV LIAONING
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  • Abstract
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  • Claims
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Problems solved by technology

The ultraviolet exposure method can only write the fiber core doped with germanium, which limits its application on the pure silica material substrate photonic crystal fiber

Method used

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  • An electronically controlled and tuned long-period photonic crystal fiber grating temperature sensor
  • An electronically controlled and tuned long-period photonic crystal fiber grating temperature sensor
  • An electronically controlled and tuned long-period photonic crystal fiber grating temperature sensor

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Experimental program
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Embodiment 1

[0028] An electronically controlled and tuned long-period photonic crystal fiber grating temperature sensor is manufactured by stacking and drawing a photonic crystal fiber. The photonic crystal fiber base material FK51A has a relatively high refractive index. The end face of photonic crystal fiber is as figure 1 As shown, the cladding and core air hole diameter d is 1.05 μm, the hole spacing Λ is 4.61 μm, the fiber diameter D is 125 μm, and the refractive index of the substrate material n 1 It is 1.4759 (at 1550nm wavelength); the refractive index range of liquid crystal filled in the fiber core is 1.51~1.71. This parameter makes the photonic crystal fiber have an uncut single-mode characteristic, thereby avoiding the interference of other higher-order modes.

[0029] The periodic refractive index modulation of the photonic crystal fiber core filled with liquid crystal is carried out by applying voltage through the comb electrode to make an electronically controlled and tun...

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Abstract

The invention proposes a long-period photonic crystal fiber grating temperature sensor of an electric control tuning type. A photonic crystal fiber employs an FK51A material with the refractive indexbeing higher than the refractive index of conventional silicon dioxide as a substrate. A liquid crystal material which is sensitive to temperature and an electric field is disposed in a core air holeof the photonic crystal fiber. A voltage is applied to a comb-shaped electrode to periodically change the refractive index of a liquid core, thereby achieving the modulation of an effect of a long-period fiber grating. The resonant wavelength of the sensor can be determined through changing the interval (grating period) of comb-shaped electrodes. When the external temperature changes, the refractive index of liquid crystal changes, so the sensor can achieve the measurement of temperature through the monitoring of the changes of the resonant wavelength. The sensor provided by the invention is low in cost, is flexible in structure, and is tunable in wavelength and bandwidth.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and relates to an electronically controlled and tuned long-period photonic crystal fiber grating device, which can be used as a high-sensitivity temperature sensor. Background technique [0002] Long-period fiber grating sensors have the advantages of high sensitivity, compact structure, corrosion resistance, and anti-electromagnetic interference. They have long been a research hotspot in the field of optical fiber sensing. At present, long-period fiber grating sensors have been widely used to measure physical parameters such as refractive index, temperature, strain, and bending. However, traditional long-period fiber gratings can no longer meet the requirements of high-sensitivity measurement. Therefore, new sensors with high performance indicators need to be continuously explored. . [0003] Photonic crystal fiber is a special fiber with multi-layer air hole cladding, its flexibl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32
CPCG01K11/3206
Inventor 赵勇王琦杜超
Owner NORTHEASTERN UNIV LIAONING
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