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An all-optical fluid mass flow monitoring device and method

A technology for fluid quality and flow monitoring, applied in mass flow measurement devices, application of thermal effects to detect fluid flow, etc., can solve the problems of inapplicability of mass flow meters, potential safety hazards of electric sparks, and easy corrosion of heating wires.

Inactive Publication Date: 2018-08-28
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a potential safety hazard of electric sparks during the monitoring process, and the heating wire is also susceptible to corrosion
In the environment where there are flammable and explosive liquids such as gasoline, kerosene, and liquefied petroleum gas, and in the working environment of high-risk gases such as gas, carbon monoxide, and acetylene, or corrosive gases such as chlorine and hydrogen chloride, this type of traditional mass flowmeter is used. not applicable

Method used

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  • An all-optical fluid mass flow monitoring device and method
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Experimental program
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Effect test

Embodiment 1

[0026] like figure 1 As shown, this embodiment is an all-optical fluid mass flow monitoring device, including a heating light source 1, a detection light source 2, a first filter-type wavelength division multiplexer 3, a sensing unit 4, a second filter-type wavelength division multiplexer With device 5 and spectroscopic analysis equipment 6. The heating light source 1, the detection light source 2, and the sensing unit 4 are respectively connected to the first filter-type wavelength division multiplexer 3, and the second filter-type wavelength division multiplexer 5 is respectively connected to the other end of the sensing unit 4 and the spectrum analysis device 6.

[0027] The sensing unit structure in this embodiment is as figure 2 As shown, the sensing unit 4 is a composite structure of single-mode optical fiber (4-1)-photothermal optical fiber (4-3)-single-mode optical fiber (4-5), and the three are welded by a fusion splicer. Fiber Bragg gratings 4-2 and 4-4 are respe...

Embodiment 2

[0035] Present embodiment except following feature other structures are with embodiment 1:

[0036] In this embodiment, for high-risk gases such as gas, carbon monoxide, and acetylene, or corrosive gases such as chlorine and hydrogen chloride, the length of the fiber Bragg gratings 4-2 and 4-4 is selected as 2 mm, and the length of the photothermal optical fiber 4-3 is selected as 1 mm.

Embodiment 3

[0038] Present embodiment except following feature other structures are with embodiment 1:

[0039] In this embodiment, for flammable and explosive liquids such as ethanol and isopropanone, the length of the fiber Bragg gratings 4-2 and 4-4 is selected as 2 mm, and the length of the photothermal optical fiber 4-3 is selected as 1 mm.

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Abstract

An all-optical device for monitoring a mass and a flow rate of a fluid, comprising a heating light source (1), a detection light source (2), a first filter wavelength division multiplexer (3), a sensing unit (4) and a spectrum analyzer (6); the sensing unit (4) has a composite structure of: single mode fiber / heating fiber / single mode fiber; both segments of the single mode fibers are inscribed with fiber Bragg gratings (FBG) to form Fabry-Perot cavities, and the heating fiber is a resonant cavity. Also disclosed is a monitoring method based on the all-optical device for monitoring the mass and the flow rate of the fluid. The device and the method measure accurately, are sensitive, all-optical, small and safe, and are particularly suitable for the monitoring of flammable and combustible fluids.

Description

technical field [0001] The invention relates to the field of fluid mass flow monitoring research, in particular to an all-optical fluid mass flow monitoring device and method. Background technique [0002] At present, fluid mass flow monitoring technology is widely used in various fields such as industrial production, energy measurement, environmental protection engineering and transportation. This monitoring technology can be used for both fluid mass flow measurement and process control. The thermal mass flowmeter is widely used in the market. The sensor in this flowmeter is composed of a thermistor. When monitoring, the sensing unit is heated by an electrical method. Therefore, there is a potential safety hazard of electric sparks during the monitoring process, and the heating wire is also easily corroded. In the environment where there are flammable and explosive liquids such as gasoline, kerosene, and liquefied petroleum gas, and in the working environment of high-risk...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/76
CPCG01F1/68G01F1/76
Inventor 周斌姜恒和何赛灵陈卓高少锐
Owner SOUTH CHINA NORMAL UNIVERSITY