Discontinuous liquid level sensor based on optical fiber bragg grating technology

A liquid level sensor, discontinuous technology, applied in the direction of buoy liquid level indicator, etc., can solve the problem of increased workload, and achieve the effect of small size, low power consumption and good stability

Active Publication Date: 2017-02-22
珠海任驰光电科技有限公司
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Problems solved by technology

Because most of this technology uses the end of the optical fiber or prism as the sensing probe to contact the liquid, the exposed sensing probe may be affected by dynamic disturbances from floating objects, vibrations, and filling. bio-adhesion or chemical pollution, the sensor needs routine maintenance, and the workload is greatly increased

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  • Discontinuous liquid level sensor based on optical fiber bragg grating technology
  • Discontinuous liquid level sensor based on optical fiber bragg grating technology
  • Discontinuous liquid level sensor based on optical fiber bragg grating technology

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Embodiment Construction

[0020] The Bragg equation of fiber grating is λ= 2 n eff Λ, the central reflection wavelength λ of the fiber Bragg grating will vary with the grating period Λ and the core effective refractive index n eff change with changes. When the FBG is subjected to a longitudinal strain or the surrounding temperature changes, Λ and n eff will change, causing the grating Bragg center wavelength to shift by dλ=2 n eff dΛ+2Λdn eff .

[0021] The structure of the FBG sensing probe used for liquid level detection in a non-continuous liquid level sensor based on fiber Bragg grating technology is as follows: figure 2 As shown, a schematic diagram of a float with a magnet installed inside and a schematic diagram of a FBG sensor placed in a package are shown. The FBG sensor is composed of a fiber Bragg grating cantilever beam structure. When the liquid level rises, the float also moves upward. At this time, the magnet in the float attracts the carbon fiber plate with the iron sheet. The b...

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Abstract

Provided is a discontinuous liquid level sensor based on the optical fiber bragg grating technology. The discontinuous liquid level sensor comprises a broadband light source, a 3dB optical fiber coupler, an FBG sensing array, a wavelength demodulation module and a micro-control unit. Light output by the broadband light source passes through a temperature reference optical grating and a stress sensing optical grating which are stuck to a cantilever beam structure in the FBG sensing array in sequence through the 3dB optical fiber coupler, and the packaging material of a sensing probe, the floater material and the optical grating sticking material all adopt carbon fiber; the liquid level change can change the acting force of a magnet on a floater to sheet iron on a carbon fiber plate, the carbon fiber plate is made to be deformed, the reflection wavelength of the sensing optical grating is changed, reflected light is input into the wavelength demodulation module through the 3dB optical fiber coupler, and demodulation of the reflection wavelength is completed; a signal is transmitted to the micro-control unit with a temperature-stress compensation algorithm for data processing. The discontinuous liquid level sensor is simple and reliable in structure, high in detection precision and sensitivity and capable of being applied to severe environments such as high temperature and high corrosion and achieving discontinuous detection of liquid levels of different heights.

Description

technical field [0001] The invention relates to a discontinuous liquid level monitoring sensor, in particular to a liquid level sensor which is based on fiber Bragg grating technology and a non-contact cantilever beam mechanical structure and can be applied in harsh environments. Background technique [0002] Liquid level monitoring is one of the main tasks of process control. Liquid level sensor is a device for detecting liquid height. It has important and extensive applications in daily life and modern production. With the intelligentization and unification of the control system, the objects of liquid level measurement are becoming more and more extensive, and the liquid level sensor is required to have higher measurement accuracy, better reliability, stronger practicability, and more suitable for special measurement environments. Especially when the measured medium is viscous, conductive, or the liquid level fluctuates or there are bubbles, or it is necessary to consider ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/30
Inventor 常天英崔洪亮汤姆·考斯卡邹吉林于淼刘野李亚
Owner 珠海任驰光电科技有限公司
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