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Interferometric optical fiber humidity sensor based on graphene and manufacturing method of interferometric optical fiber humidity sensor

A humidity sensor and graphene technology, which is applied in instruments, scientific instruments, and material analysis through optical means, can solve problems such as difficult observation, and achieve the effects of easy observation, high degree of reduction, and good film formation

Pending Publication Date: 2019-07-12
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the study of OFHS using graphene-based nanomaterials as humidity-sensitive materials, in addition to the literature [Sens.Actuators B 255, 57-69, 2018], the sensing parameters are basically based on the change of the optical power or the intensity of the interference peak. , while the shift of the wavelength position of the interference peak is usually very small and difficult to observe

Method used

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  • Interferometric optical fiber humidity sensor based on graphene and manufacturing method of interferometric optical fiber humidity sensor
  • Interferometric optical fiber humidity sensor based on graphene and manufacturing method of interferometric optical fiber humidity sensor
  • Interferometric optical fiber humidity sensor based on graphene and manufacturing method of interferometric optical fiber humidity sensor

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Embodiment 1

[0052] see figure 1 , one A graphene-based interferometric optical fiber humidity sensor, comprising: a glass slide 1 and two single-mode optical fibers (3, 4) bonded with a metal cylinder 2, and the two single-mode optical fibers pass through the two sides of the metal cylinder 2 respectively and face each other Bending to form two cross-coupling points, the two ends of the single-mode fiber are fixed on the glass slide 1, the middle part of the single-mode fiber is tapered, and the tapered waist region is located between the two cross-coupling points, one of the single-mode fiber The tapered waist area of ​​the fiber is covered with the reduced graphene oxide film layer 5, and the two ends of the single-mode optical fiber covered with the reduced graphene oxide are respectively used as the input end and the output end. exist figure 1 Among them, the reduced graphene oxide is covered on the optical fiber 4, with the B end as the input end and the D end as the output end. ...

Embodiment 2

[0073] The sensor of this embodiment is exactly the same as the sensor of embodiment 1. The only difference is that the results of the humidity sensing experiment of different sensor samples of the same batch are as follows: Figure 6 and Figure 7 As shown, the position of the selected interference peak indicating the change of humidity is around 1570nm. The experimental temperature was 25°C and remained constant. In the range of 45%-95% relative humidity, the sensing sensitivity to rising humidity reaches 0.1934nm / %RH, and the sensing sensitivity to falling humidity reaches 0.2111nm / %RH. It has good recoverability.

Embodiment 3

[0075] The sensor of this embodiment is exactly the same as the sensor of embodiment 1. The only difference is that the results of the humidity sensing experiment of different sensor samples of the same batch are as follows: Figure 8 and Figure 9 As shown, the position of the selected interference peak indicating the change of humidity is around 1580nm. The experimental temperature was 25°C and remained constant. In the range of 45%-95% relative humidity, the sensing sensitivity to rising humidity reaches 0.1714nm / %RH, and the sensing sensitivity to falling humidity reaches 0.2226nm / %RH. It has good recoverability.

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Abstract

The invention relates to an interferometric optical fiber humidity sensor based on graphene. The interferometric optical fiber humidity sensor comprises a glass slide pasted with a metal cylinder, andtwo single-mode optical fibers; the two single-mode optical fibers pass through the two sides of the metal cylinder correspondingly and are bent oppositely to form two crossed coupling points; and the two ends of the single-mode optical fibers are fixed to the glass slide, tapering is conducted on the middles of the single-mode optical fibers, tapered lumbar areas are located between the two crossed coupling points, the tapered lumbar area of one of the single-mode optical fibers is covered with a reduced graphene oxide film layer, and the two ends of the single-mode optical fiber covered with reduced graphene oxide serve as the input end and the output end correspondingly. The interferometric optical fiber humidity sensor is simple and compact in structure and easy to prepare, mutual fusion welding of optical fibers of special types is not needed, and thus the cost is low; and an optical fiber interference structure is suitable for sensing of gas of other types and biological and chemical sensing as well.

Description

technical field [0001] The invention relates to the technical field of optical fiber humidity sensing, in particular to a graphene-based interference optical fiber humidity sensor and a manufacturing method thereof. Background technique [0002] Optical fiber humidity sensor (OFHS) has the advantages of small size, high precision, corrosion resistance, anti-electromagnetic interference, can be placed in hard-to-reach spaces, can be multiplexed, and can be used for long-distance sensing, and has attracted widespread attention. Optical fiber humidity sensor can be divided into several realization types such as light absorption type, fiber grating type, interference type and resonance absorption type. The optical absorption type is based on the interaction between the evanescent wave field of the optical fiber and the moisture-sensitive substance, and the absorption of the moisture-sensitive substance to light responds to changes in environmental humidity, so that the power or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/45
CPCG01N21/45G01N2021/458
Inventor 肖毅余健辉钟永春罗云瀚
Owner JINAN UNIVERSITY
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