Temperature sensor based on optical fiber double-cavity double vernier effect sensitization

A technology of temperature sensor and vernier effect, which is applied to thermometers, thermometers, instruments, etc. with physical/chemical changes, can solve the problems of long length of special optical fibers, insufficient integration, and no public reports, so as to avoid interference and improve Sensitivity, the effect of contributing to miniaturization

Pending Publication Date: 2021-08-06
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these studies, it is necessary to demodulate the spectrum to extract the envelope; or the length of the required special fiber is too long, and the cost is relatively expensive; or the integration level is not high enough, so it is necessary to design a low-cost, compact temperature sensor to improve the measurement sensitivity. very important
[0004] The present invention designs a temperature sensor based on double-cavity double vernier effect sensitization of optical fiber. After literature search, there is no public report identical to the present invention.

Method used

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  • Temperature sensor based on optical fiber double-cavity double vernier effect sensitization
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  • Temperature sensor based on optical fiber double-cavity double vernier effect sensitization

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specific Embodiment 1

[0026] A temperature sensor based on double-cavity optical fiber double vernier effect sensitization in this embodiment, the structural diagram is as follows figure 1 shown. The all-fiber dual-cavity cascade sensing device based on the double vernier effect includes a spontaneous emission amplification ASE light source as a wide light source (1), a fiber optic circulator (2), an introduction single-mode fiber (3), and a suspended core fiber (4) , tail-end single-mode optical fiber (5), spectrometer (6);

[0027] Spontaneous emission amplification ASE light source as a wide light source (1) emits continuous-wavelength laser light through a fiber circulator (2) and enters into a single-mode fiber (3) to be transmitted to a suspension core fiber (4) and a single-mode fiber at the end (5), The reflected light is transmitted to the spectrometer (6) to obtain an interference spectrum with a vernier effect.

specific Embodiment 2

[0029] A temperature sensor based on double-cavity optical fiber double vernier effect sensitization in this embodiment, on the basis of the specific embodiment 1, is further limited to include a suspended core optical fiber (4) with a length of 287 μm, its outer diameter is 125 μm, and the inner diameter is 125 μm. The fiber core is 9 μm, and there is an air hole with a diameter of 36 μm next to the fiber core. In order to ensure better performance of the sensor and facilitate the formation of a double vernier effect, the single-mode optical fiber (5) at the end is selected to have a length of 135 μm, an outer diameter of 125 μm, and an inner core of 9 μm. The structure of the sensor head is as figure 2 shown.

[0030] This structural design utilizes the close relationship between twice the free spectral range of the air cavity and twice the free spectral range of the quartz cavity to form a vernier effect. Enlarging the translation of the envelope to M times the translati...

specific Embodiment 3

[0032] A temperature sensor based on double-cavity double vernier effect sensitization of optical fiber in this embodiment, on the basis of specific embodiment 1, further defines that one end of the suspended core optical fiber (4) is connected to the end of the single-mode optical fiber (3) Welding, the corresponding welding surface is called the first welding surface; the other end of the suspension core fiber (4) is welded with one end of the tail end single-mode fiber (5), and the corresponding welding surface is called the second welding surface; Perform dislocation fusion splicing on the leading single-mode optical fiber (3) and the suspended core optical fiber (4). The core of the core fiber (4) is transmitted to the tail end single-mode fiber (5), and the other part is transmitted along the air hole of the suspended core fiber (4). Reflection occurs when the refractive indices of the two interfaces are different. Respectively at the interface between the imported sing...

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Abstract

The invention belongs to the field of optical fiber sensing, and particularly relates to a temperature sensor based on optical fiber double-cavity double vernier effect sensitization. The problems that an existing temperature sensor is low in sensitivity and not high enough in integration degree are solved. According to the invention, a sensing head is prepared from a single-mode optical fiber and a suspended core optical fiber, that is to say, sensibilization is realized by generating a double vernier effect based on double-cavity cascade connection. In addition, the temperature sensor is simple in structure and convenient to manufacture, and does not need gluing or sleeving. The sensitivity of a sensing head structure is M times that of a single air cavity. The temperature sensor can be used for environment temperature detection, and the all-fiber structure has huge potential in high-temperature measurement application.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, and in particular relates to a temperature sensor based on optical fiber dual-cavity double-cursor effect sensitization. Background technique [0002] Optical fiber sensors have inherited the excellent characteristics of optical fibers. The sensitivity of optical fiber sensors is several orders of magnitude higher than that of traditional sensors. Due to their superior performance, they are favored and widely researched and applied in the fields of industry, environment, and medical treatment. . Optical fiber temperature sensors have the advantages of low cost, fast response, anti-electromagnetic interference, and durability. The use of the double vernier effect can further improve the sensing performance and meet higher requirements. [0003] In recent years, temperature sensors using the vernier effect include cascaded or parallel structural combinations of Fabry-Perot cavities, Mach-Zehn...

Claims

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Application Information

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IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 姜久兴边缘杨玉强
Owner HARBIN UNIV OF SCI & TECH
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