CN102607651B - Differential flowmeter - Google Patents
Differential flowmeter Download PDFInfo
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- CN102607651B CN102607651B CN201210043012.3A CN201210043012A CN102607651B CN 102607651 B CN102607651 B CN 102607651B CN 201210043012 A CN201210043012 A CN 201210043012A CN 102607651 B CN102607651 B CN 102607651B
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- liquid flow
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- bragg grating
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Abstract
The invention discloses a differential flowmeter, which comprises a fixing rod. The fixing rod penetrates through a liquid flow tube along the diameter thereof and is fixed in the liquid flow tube, two opposite identical umbrella-shaped structures are arranged on the fixing rod in the liquid flow tube along the axial center direction of the liquid flow tube, each umbrella-shaped structure consists of a cone and a supporting cylinder, both the two supporting cylinders are provided with fiber bragg gratings with the same parameters, the same optical fiber is photoetched and processed by the aid of ultraviolet rays at intervals to form the two fiber bragg gratings, and the optical fiber is connected with an intensity demodulating device after leading out of the liquid flow tube, and then is connected with a data processing device. The differential flowmeter is simple in structure, and by the aid of stress difference of the two FBG (fiber bragg gratings) with the same structures on the optical fiber, self compensation of temperature and external influences is realized.
Description
Technical field
The present invention relates to a kind of differential flowmeter.Belong to flow measurement, detection technique.
Background technology
In industrial processes robotization, flow is to need one of parameter of often measuring and controlling, uses the earliest, most widely used flow sensor is mechanical rotor formula, and its technology is relatively ripe, but owing to limited by physical construction, measuring error is larger.The electromagnetic flowmeter growing up subsequently, ultrasonic flow meter and acoustics Doppler flowmeter measuring accuracy are all higher, and easy to use, but are subject to electromagnetic interference (EMI), and use cost is higher.The advantages such as optical fibre flowmeter has anti-electromagnetic interference (EMI), size is little and lightweight, but optical fibre flowmeter utilizes flow to design the modulation of the intensity of light signal and phase place, and light intensity and phase place are affected by environment larger, are difficult to accurately detect in practical application.Fiber Bragg Grating FBG (FBG) flow sensor is to utilize fluctuations in discharge to cause that reflected light wavelength changes, and external environment is very little on the impact of wavelength, therefore FBG flow sensor becomes the focus of industry research in recent years.The sensor of making for fiber bragg grating device has some research reports, as the FBG flow sensor (Chen Jianjun based on venturi tube structure, Zhang Weigang, Tu Qinchang etc., High-Sensitivity Flow Velocity Sensor based on fiber grating, Acta Optica, 2006, 26 (8): 1136-1139), FBG flow sensor (Li Hongmin based on vortex street structure, high grand, Liu Bo etc., a kind of novel fiber grating vortex flow sensors, sensing technology journal, 2006, 19 (4): 1195-1197), FBG flow sensor (Zhao Yong based on target formula structure, Chen Kun, Yang Jian. Novel target type flow meter based on a differential fiber Bragg grating sensor, Measurement, 2005, 38 (3): 230-235).These sensors, all by different Design of Mechanical Structures, make the variation of flow velocity and act on the distortion on structure and be subject to the certain mathematical relation of force retaining, and the FBG sensor senses sticking on structure is out of shape with stressed, thus the variation of indirectly having measured flow; But due to they structural designs, between flow measurement and structure are stressed, be difficult to guarantee linear, and be subject to temperature and external disturbance serious, even if want to eliminate temperature impact, need additional reference temperature sensing; Although guaranteed linear relationship in some structure and improved precision, structure relative complex.
Summary of the invention
The object of the invention is, for overcoming above-mentioned the deficiencies in the prior art, provides a kind of simple in structure, easy for installation, temperature self-compensation, highly sensitive, measure differential flowmeter accurately.
For achieving the above object, the present invention adopts following technical proposals:
A kind of differential flowmeter, comprise a fixed bar that passes and be fixed on this pipe along liquid flow pipe diameter, axial centre direction along liquid flow pipe on fixed bar in liquid flow pipe is provided with two relative same umbrella-shaped structure bodies, described two umbrella-shaped structure bodies are comprised of cone and support cylinder body, their physical dimensions are identical, on described two support cylinder bodies, be equipped with the Fiber Bragg Grating FBG of same parameters, two Fiber Bragg Grating FBG parameters are identical, on an optical fiber, on space, at a distance of a segment distance ultraviolet, scribe processing, this root optical fiber is drawn after liquid flow pipe, strength of joint demodulating equipment (light source, photo-coupler, photoelectric switching circuit), then be connected with data processing equipment.
Between described fixed bar and the tube wall of liquid flow pipe, be tightly connected, two identical Fiber Bragg Grating FBGs respectively on former and later two support cylinder bodies cutting lay, lay rear water-tight glue, cone and support cylinder body are elastic body, experience liquid in pipe flow velocity flow field and act on the stress deformation on elastic body.
Described two Fiber Bragg Grating FBGs are same parameter, and on an optical fiber, processing is scribed and formed, and space retains certain distance, is used for guaranteeing that two Fiber Bragg Grating FBGs are laid on former and later two support cylinder bodies.
On same described optical fiber, the differential flowmeter of two same FBG is demodulated into intensity demodulation.
The present invention adopts said structure, during application, when tube fluid flows on first cone of umbrella-shaped structure body, produce pressure, fluid can expand outwardly, and makes first support cylinder body pressurized, and the fiber-optic grating sensor on it is pressurized also, fluid is flowed through after fixed bar, while continuing to arrive on second cone, expand outwardly, make second cone tension, second support cylinder body produces stretcher strain, and the fiber-optic grating sensor on it is Tensile also.Act on like this two pressure, pulling force on support cylinder body, and the Fiber Bragg Grating FBG of the same parameter above them that is laid in such as fluid temperature variations, flow disturbance detects, through optical fiber, the laggard row data processing of fiber grating demodulation device, after data processing equipment analyzing and processing, draw the flow information in fluid flow pipe.
The invention has the beneficial effects as follows, although the present invention adopts fiber grating (FBG) device to experience the elastic body stress deformation that flow velocity causes, but before and after adopting, on elastic body, two FBG devices of the same parameter are realized fluid-velocity survey, utilize the energy of two FBG reflectance spectrum overlapping regions measure before and after elastomeric stress deformation (whenever, a tension, a pressurized), thereby indirectly measure the variation of flow velocity, belong to intensity demodulation, in measurement structure, adopt FBG the most easily stretching and the compression direction of sensitivity, change in flow and the stress deformation that causes elastic structure have been guaranteed, and cause between the variation of FBG reflectance spectrum waveform drift and become essential linear relationship, and, adopted symmetrical the same with two the FBG intensity demodulation principle of physical construction, FBG temperature influence and external disturbance are eliminated naturally, precision is high.The present invention is simple in structure, adopts two FBG of the same structure on an optical fiber stressed poor, and precision is high, temperature, external action self compensation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Wherein 1. liquid flow pipes, 2. cone, 3. support cylinder body, 4. fixed bar, 5. Fiber Bragg Grating FBG.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1, a kind of differential flowmeter, comprise a fixed bar 4 that passes and be fixed on this pipe along liquid flow pipe 1 diameter, axial centre direction along liquid flow pipe 1 on fixed bar in liquid flow pipe 1 is provided with two relative same umbrella-shaped structure bodies, described two umbrella-shaped structure bodies are comprised of cone 2 and support cylinder body 3, their physical dimensions are identical, on described two support cylinder bodies 3, be equipped with the Fiber Bragg Grating FBG 5 of same parameters, two Fiber Bragg Grating FBG 5 parameters are identical, on an optical fiber, on space, at a distance of a segment distance ultraviolet, scribe processing, this root optical fiber is drawn after liquid flow pipe 1, strength of joint demodulating equipment (light source, photo-coupler, photoelectric switching circuit), then be connected with data processing equipment.
Between described fixed bar 4 and the tube wall of liquid flow pipe 1, be tightly connected, two identical Fiber Bragg Grating FBGs 5 respectively on former and later two support cylinder bodies 3 cutting lay, lay rear water-tight glue, cone 2 and support cylinder body 3 are elastic body, experience liquid in pipe flow velocity flow field and act on the stress deformation on elastic body.
Described two Fiber Bragg Grating FBGs 5 are same parameter, and on an optical fiber, processing is scribed and formed, and space retains certain distance, is used for guaranteeing that two Fiber Bragg Grating FBGs 5 are laid on former and later two support cylinder bodies 3.
On same described optical fiber, the differential flowmeter of two same FBG is demodulated into intensity demodulation.
The present invention adopts said structure, during application, when tube fluid flows on first cone 2 of umbrella-shaped structure body, produce pressure, fluid can expand outwardly, make first support cylinder body 3 pressurizeds, fluid is flowed through after fixed bar 4, while continuing to arrive on second cone 2, expand outwardly, make second cone 2 tension, second support cylinder body 3 produces stretcher strain, act on two pressure on support cylinder body 3, pulling force detects by Fiber Bragg Grating FBG 5, through optical fiber, the laggard row data processing of fiber grating demodulation device, after data processing equipment analyzing and processing, draw the flow information in fluid flow pipe.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (3)
1. a differential flowmeter, it is characterized in that, comprise a fixed bar that passes and be fixed on this pipe along liquid flow pipe diameter, axial centre direction along liquid flow pipe on fixed bar in liquid flow pipe is provided with two relative same umbrella-shaped structure bodies, described two umbrella-shaped structure bodies are comprised of cone and support cylinder body, on described two support cylinder bodies, be equipped with the Fiber Bragg Grating FBG of same parameters, described two Fiber Bragg Grating FBGs be on same optical fiber spacing ultraviolet scribe processing be prepared from, this root optical fiber is drawn strength of joint demodulating equipment after liquid flow pipe, then be connected with data processing equipment,
During application, when tube fluid flows on first cone of umbrella-shaped structure body, produce pressure, fluid can expand outwardly, make first support cylinder body pressurized, Fiber Bragg Grating FBG on it is pressurized also, and fluid is flowed through after fixed bar, while continuing to arrive on second cone, expand outwardly, make second cone tension, second support cylinder body produces stretcher strain, and the Fiber Bragg Grating FBG on it is Tensile also; Act on like this two pressure, pulling force on support cylinder body, and the be laid in Fiber Bragg Grating FBG of the same parameter above them of fluid temperature variations, flow disturbance detects, through optical fiber, the laggard row data processing of fiber grating demodulation device, after data processing equipment analyzing and processing, draw the flow information in fluid flow pipe.
2. differential flowmeter as claimed in claim 1, is characterized in that, between described fixed bar and the tube wall of liquid flow pipe, is tightly connected.
3. differential flowmeter as claimed in claim 1, is characterized in that, two identical Fiber Bragg Grating FBGs respectively on former and later two support cylinder bodies cutting lay, lay rear water-tight glue, cone and support cylinder body are elastic body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210043012.3A CN102607651B (en) | 2012-02-24 | 2012-02-24 | Differential flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210043012.3A CN102607651B (en) | 2012-02-24 | 2012-02-24 | Differential flowmeter |
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| CN102607651A CN102607651A (en) | 2012-07-25 |
| CN102607651B true CN102607651B (en) | 2014-04-16 |
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| CN201210043012.3A Expired - Fee Related CN102607651B (en) | 2012-02-24 | 2012-02-24 | Differential flowmeter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104389581B (en) * | 2014-09-17 | 2017-04-19 | 中国石油大学(北京) | Underground fluid induction device and fluid flow velocity measuring system using same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629836A (en) * | 2009-08-17 | 2010-01-20 | 昆明理工大学 | Target type fiber grating liquid flowmeter |
| CN201819710U (en) * | 2010-08-25 | 2011-05-04 | 西安金和光学科技有限公司 | Optical fiber type flow monitoring device |
| CN202547700U (en) * | 2012-02-24 | 2012-11-21 | 山东大学 | Double-fiber Bragg grating differential pressure flowmeter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7729567B2 (en) * | 2007-05-14 | 2010-06-01 | The Hong Kong Polytechnic University | Fiber optic transducer for simultaneous pressure and temperature measurement in fluid flow |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629836A (en) * | 2009-08-17 | 2010-01-20 | 昆明理工大学 | Target type fiber grating liquid flowmeter |
| CN201819710U (en) * | 2010-08-25 | 2011-05-04 | 西安金和光学科技有限公司 | Optical fiber type flow monitoring device |
| CN202547700U (en) * | 2012-02-24 | 2012-11-21 | 山东大学 | Double-fiber Bragg grating differential pressure flowmeter |
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