Optical fiber vortex flowmeter that can measure temperature and density at the same time

A vortex flowmeter, a technology for measuring temperature, applied in the field of optical fiber vortex flowmeter and multifunctional optical fiber vortex flowmeter, it can solve the problems of interference, vulnerability to external environment, single parameter of volume flow, etc., and achieves light weight and sensitivity High and wide range of effects

Inactive Publication Date: 2011-12-14
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a vortex flowmeter that can simultaneously measure the fluid temperature in order to overcome the disadvantages that the vortex frequency detection of the existing vortex flowmeter is easily di

Method used

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  • Optical fiber vortex flowmeter that can measure temperature and density at the same time
  • Optical fiber vortex flowmeter that can measure temperature and density at the same time
  • Optical fiber vortex flowmeter that can measure temperature and density at the same time

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: A composite structure in which the vortex generator and the vortex sensor are integrated

[0028] as attached figure 1 As shown, the meter body 101 of the flowmeter is made of stainless steel, and its inner diameter is 25mm. The vortex generator 102 is also processed from stainless steel, and is cylindrical in shape with a diameter of 6 mm. The fiber Bragg gratings 104 and 105 are made of SMF28 standard single-mode fiber treated with high-pressure hydrogen. The gratings are made by frequency-doubled Ar ion laser with a wavelength of 244nm and a phase template, and the grating length is 5mm. The center wavelength of the fiber Bragg grating 104 is 1550nm and the 3dB bandwidth is 0.2nm. The center wavelength of the fiber Bragg grating 105 is 1552nm and the 3dB bandwidth is 0.2nm. Two 0.5mm wide and 0.5mm deep square grooves are processed by wire cutting on both sides of the vortex generator 102, and the fiber Bragg gratings 104 and 105 are respectively fix...

Embodiment 2

[0034] Embodiment 2: Split structure of vortex generator and vortex sensor

[0035] as attached figure 1 And attached image 3 As shown, the difference between the second embodiment of the present invention and the first embodiment is that the vortex sensor with two fiber Bragg gratings is separated from the street generator 301 to form a vortex generator plus a vortex sensor. split structure. In this embodiment, the fiber Bragg gratings 104 and 105 are respectively fixed on both sides of the deformable body 302 with a strong waterproof adhesive, and the deformable body 302 and the fiber Bragg gratings 104 and 105 form a fiber optic vortex sensor. The street generating body 301 adopts a triangular column structure, and the width in the incoming flow direction is 6mm. The deformable body 302 adopts a stainless steel sheet with a thickness of 0.5 mm and a width of 5 mm. The fiber Bragg gratings 104 and 105 are symmetrically fixed on the two surfaces of the deformabl...

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Abstract

The invention relates to an optical fiber vortex flow meter capable of simultaneously measuring temperature, density, volume flow and mass flow, and the meter provided by the invention comprises a meter body, a vortex flow generator and two optical fiber Bragg gratings, wherein the two optical fiber Bragg gratings are respectively connected to two output ports of a 2*2 optical fiber coupler through transmission optical fibers; one input port of the 2*2 optical fiber coupler is connected to a broadband light source; the other input port of the 2*2 optical fiber coupler is connected to a wavelength demodulator and a computer in turn; and the wavelengths and bandwidths of the two optical fiber Bragg gratings meet the conditions that Lambda 2>Lambda 1+Delta Lambda 1+Delta Lambda 2, wherein Lambda 1 and Lambda 2 respectively are the central wavelengths of the two optical fiber Bragg gratings and the Delta Lambda 1 and the Delta Lambda 2 respectively are 3db bandwidths. In the optical fibervortex flow meter, a double optical fiber Bragg grating differential method is used for detecting a vortex flow frequency. The optical fiber vortex flow meter has the characteristics of wavelength coding, wavelength demultiplexing and the like, and is capable of simultaneously measuring temperature, density, volume flow and mass flow. The optical fiber vortex flow meter has the advantages of anti-electromagnetic interference property, electric insulation, corrosion resistance, essential safety, high sensitivity, light weight, small volume, wide scope of measuring objects, convenience in multipoint multiplexing and internetworking remote measuring, and the like.

Description

technical field [0001] The invention relates to an optical fiber vortex flowmeter, in particular to a multifunctional optical fiber vortex flowmeter capable of simultaneously measuring fluid temperature, density, volume flow and mass flow, and belongs to the technical field of flow measurement and optical fiber sensing. Background technique [0002] Flow (including volume flow and mass flow) is an important parameter in industrial production and control as well as in people's daily life. Instruments with flow measurement function are collectively referred to as flowmeters. Due to the different properties of the detected objects and the diversity and complexity of the detected objects, the flow detection principles and devices are also different. The more commonly used flowmeters are: float flowmeter, differential pressure flowmeter, positive displacement flowmeter, turbine flowmeter, electromagnetic flowmeter, vortex flowmeter, ultrasonic flowmeter, Coriolis flowmeter, etc...

Claims

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Application Information

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IPC IPC(8): G01F1/32G01F1/86G01K11/32G01N9/32G01K11/3206
Inventor 李恩邦
Owner TIANJIN POLYTECHNIC UNIV
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