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Cascade capillary optical fiber baroceptor based on vernier effect and preparation method thereof

An air pressure sensor and vernier effect technology, which is applied in the direction of fluid pressure measurement using optical methods, converting sensor output, and using optical devices to transmit sensing components, can solve problems such as high cost and high price, and achieve low cost and simple production. , easy to use in large-scale production effects

Inactive Publication Date: 2020-11-03
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

However, in the known published literature, most of these sensors use expensive optical fibers, the cost is high, and most of the work is carried out around high voltage, while there is little research in the field of low voltage

Method used

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  • Cascade capillary optical fiber baroceptor based on vernier effect and preparation method thereof
  • Cascade capillary optical fiber baroceptor based on vernier effect and preparation method thereof
  • Cascade capillary optical fiber baroceptor based on vernier effect and preparation method thereof

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Embodiment 1

[0027] The outer diameters of the single-mode fiber, large inner diameter capillary fiber and small inner diameter capillary fiber are all 125 μm, the inner diameter of the large inner diameter capillary fiber is 75 μm, and the inner diameter of the small inner diameter capillary fiber is 5 μm. The length of the large inner diameter capillary fiber is 333.64 μm, the length of the small inner diameter capillary fiber is 485.84 μm, and the optical path ratio is about 2.1.

[0028] The application process of using this structural fiber optic sensor for air pressure measurement is as follows:

[0029] Such as figure 2 As shown, the single-mode optical fiber (input optical fiber) of the sensor is connected to the second port of the circulator, the light source is connected to the first port of the circulator, and the spectrometer is connected to the third port of the circulator. The original reflection spectrum (solid line) of the sensor under atmospheric pressure will be obtaine...

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Abstract

The invention provides a cascade capillary optical fiber baroceptor based on vernier effect and a preparation method, the cascade capillary optical fiber baroceptor comprises a single-mode optical fiber, a large-inner-diameter (hollow) capillary optical fiber and a small-inner-diameter (hollow) capillary optical fiber, two ends of the large-inner-diameter capillary optical fiber are respectively connected with the single-mode optical fiber and the small-inner-diameter capillary optical fiber; the large-inner-diameter capillary optical fiber and the small-inner-diameter capillary optical fiberform two cascaded FP cavities with vernier effects, and the single-mode optical fiber is an input optical fiber. The sensor is simple to manufacture, low in cost and high in sensitivity in a low-voltage range.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a cascaded capillary optical fiber air pressure sensor based on a vernier effect and a preparation method thereof. Background technique [0002] Air pressure measurement has a wide range of applications in industrial equipment such as medical and health care, instrumentation, and barometers. As a new type of air pressure sensor, the optical fiber air pressure sensor has the advantages that electronic air pressure sensors do not have, such as small size, immunity to electromagnetic interference, corrosion resistance, high measurement accuracy, and applicable to various extreme environments, and has received more and more attention. focus on. [0003] At present, there are many kinds of air pressure sensors commonly used, and the FPI fiber optic air pressure sensor has received more and more attention because of its small size, high sensitivity and simple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L11/02G01D5/353
CPCG01D5/35312G01L11/025
Inventor 吴舜杨雪梅程海皓马建文
Owner WUHAN INSTITUTE OF TECHNOLOGY
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