CN102937465B - Vortex street flow-meter using fiber laser - Google Patents
Vortex street flow-meter using fiber laser Download PDFInfo
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- CN102937465B CN102937465B CN201210464791.4A CN201210464791A CN102937465B CN 102937465 B CN102937465 B CN 102937465B CN 201210464791 A CN201210464791 A CN 201210464791A CN 102937465 B CN102937465 B CN 102937465B
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Abstract
The invention discloses a vortex street flow-meter using fiber laser. The vortex street flow-meter using the fiber laser comprises a shell (10), a vortex street generator (50) and a fiber laser device (30), a vortex street flow-meter body using the fiber laser is fixedly connected with a measured pipeline by the shell (10), the vortex street generator (50) is mounted inside the shell (10) and is used for generating vortex streets, and the fiber laser device (30) is mounted on the vortex street generator (50) and is used for measuring vortex street frequency. The vortex street flow-meter has the advantages that structural and technical problems of an existing flow-meter are solved, and the measuring accuracy of the flow-meter is improved.
Description
Technical field
The present invention relates to flow rate test technical field, particularly relate to a kind of optical-fiber laser vortex shedding flow meter, be applicable to the flow measuring fluid.
Background technology
In a lot of fields of commercial production and people's lives, the flow of convection cell is all needed to monitor.At present, conventional flow is in respect of target type meter, turbo flow meter or vortex shedding flow meter etc.These flowmeters are record power, rotating speed or vibration signal by electric transducer mostly, then input analytical equipment and calculate, and finally draw flow number.But, electrical type sensor exist sealing difference, easily electric leakage, perishable, by problems such as electromagnetic interference (EMI).
Fibre Optical Sensor adopts optical fiber to carry out sensing and transmission, there are not the problems referred to above, therefore in recent years obtains increasing attention.But still there is more problem in current optical fibre flowmeter.
The people such as Zhao Dong propose the design (Zhao Dong etc. of Optical Fiber Vortex-Shedding Flowmeter, " all-fiber flux of vortex street measuring method based on white light interference theory " Chinese journal of scientific instrument, 2011), this eddy currents flowmeter adopts fiber perpendicular to arrange in the flow direction, by the pressure of fluid, fiber lengths is changed.Its deficiency is that sensing system is complicated, and when fluid viscosity is larger, optical fiber is easy to be thrust by fluid.
The people such as Zheng Lunjia disclose one and " comprise the Karman vortex flow meter assembly of fiber Bragg grating sensor and measure the method for rate of flow of fluid " (Chinese Patent Application No. 200780047600.1), fiber grating is adopted to measure the frequency of vortex street generation in the program, because the live width of fiber grating is wider, and measurement is dynamic strain signal, thus make measuring accuracy lower.
Therefore, how to simplify the Structure and energy of flowmeter, improve measuring accuracy, become the problem that solution needed at present badly by optical fibre flowmeter.
Summary of the invention
(1) technical matters that will solve
In view of this, fundamental purpose of the present invention is the optical-fiber laser vortex shedding flow meter providing a kind of fluid flow to monitor, and to solve the Structure and energy problem of existing flowmeter, improves testing flow meter precision.
(2) technical scheme
For achieving the above object, the invention provides a kind of optical-fiber laser vortex shedding flow meter, this optical-fiber laser vortex shedding flow meter comprises:
By this optical-fiber laser vortex shedding flow meter and the affixed shell 10 of tested pipeline;
Be installed on this shell 10 inside in order to produce the vortex shedder 50 of vortex street; And
Be installed on this vortex shedder 50 to measure the fiber laser 30 of vortex street frequency.
In such scheme, described shell 10 is the cylindrical of hollow, and its sidewall has a fairlead 11, and the tail optical fiber of described fiber laser 30 is drawn by this fairlead 11.
In such scheme, this optical-fiber laser vortex shedding flow meter also comprises a demodulated equipment, and the tail optical fiber of described fiber laser 30 is drawn by this fairlead 11 and is connected with this demodulated equipment afterwards, makes this demodulated equipment carry out demodulation to the data that fiber laser 30 is measured.
In such scheme, it is inner that described vortex shedder 50 is installed on this shell 10 by a crossbeam 52, and there are a center pit 51 in the central authorities of this vortex shedder 50, and described fiber laser 30 is installed on this vortex shedder 50 by this center pit 51.
In such scheme, described fiber laser 30 is fixed in this center pit 51 of vortex shedder 50, and described fiber laser 30 is suspended in fluid in order to the one end measuring vortex street frequency along fluid flow direction, and tail optical fiber is at one end drawn by this fairlead 11.
In such scheme, the axis of described fiber laser 30 is consistent with the flow direction of fluid.
(3) beneficial effect
As can be seen from technique scheme, the present invention has following beneficial effect:
1, this optical-fiber laser vortex shedding flow meter provided by the invention, the mode adopting a fiber laser to arrange along flow direction, simplifies the inner structure of existing flowmeter complexity.
2, this optical-fiber laser vortex shedding flow meter provided by the invention, measures by fiber laser the vibration signal that vortex street produces, because fiber laser has much narrow compared with fiber grating live width, adopts during interference technique measuring vibrations signal and have higher precision.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of optical-fiber laser vortex shedding flow meter provided by the invention;
Fig. 2 is the vertical view of optical-fiber laser vortex shedding flow meter provided by the invention;
Fig. 3 is that optical-fiber laser vortex shedding flow meter provided by the invention is met to sectional view during flow direction.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Please refer to Fig. 1 to Fig. 3, Fig. 1 is the schematic diagram of optical-fiber laser vortex shedding flow meter provided by the invention; Fig. 2 is the vertical view of optical-fiber laser vortex shedding flow meter provided by the invention; Fig. 3 is that optical-fiber laser vortex shedding flow meter provided by the invention is met to sectional view during flow direction.
This optical-fiber laser vortex shedding flow meter comprises: by this optical-fiber laser vortex shedding flow meter and the affixed shell 10 of tested pipeline; Be installed on this shell 10 inside in order to produce the vortex shedder 50 of vortex street; And be installed on this vortex shedder 50 to measure the fiber laser 30 of vortex street frequency.
Wherein, described shell 10 is the cylindrical of hollow, and its sidewall has a fairlead 11, and the tail optical fiber of described fiber laser 30 is drawn by this fairlead 11.This optical-fiber laser vortex shedding flow meter also comprises a demodulated equipment, and the tail optical fiber of described fiber laser 30 is drawn by this fairlead 11 and is connected with this demodulated equipment afterwards, makes this demodulated equipment carry out demodulation to the data that fiber laser 30 is measured.It is inner that described vortex shedder 50 is installed on this shell 10 by a crossbeam 52, and there are a center pit 51 in the central authorities of this vortex shedder 50, and described fiber laser 30 is installed on this vortex shedder 50 by this center pit 51.Described fiber laser 30 is fixed in this center pit 51 of vortex shedder 50, and described fiber laser 30 is suspended in fluid in order to the one end measuring vortex street frequency along fluid flow direction, and tail optical fiber is at one end drawn by this fairlead 11.The axis of described fiber laser 30 is consistent with the flow direction of fluid.
The principle of work of optical-fiber laser vortex shedding flow meter provided by the invention is, with reference to figure 1, Fig. 2 and Fig. 3, when fluid flows in shell 10, vortex shedder 50 for generation of vortex street, and causes in the generation of vortex shedder rear portion perpendicular to the fluid oscillation flowing to direction.Fluid oscillation causes the upper lower edge formula vibration of fiber laser 30, and the vibration of this string formula causes the output light wavelength of fiber laser 30 to change.The frequency of this wavelength variations is consistent with the frequency that vortex street occurs, and therefore can record flow by the frequency of the wavelength variations checking fiber laser 30.
It should be noted that, when flow velocity is higher, the frequency that vortex street occurs increases, and the amplitude of fiber optic wavelength change still maintains in less scope.With regard to prior art development level, during the method that and if only if adopts interfere type to measure, measuring accuracy could be improved.And the reflection wavelength live width that fiber grating exports is very fast, coherent length is very short, so adopt interfere type measuring accuracy lower.The live width of fiber laser, comparatively more than low 5 orders of magnitude of fiber grating, when adopting interfere type to measure, greatly can improve measuring accuracy.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. an optical-fiber laser vortex shedding flow meter, is characterized in that, this optical-fiber laser vortex shedding flow meter comprises:
By this optical-fiber laser vortex shedding flow meter and the affixed shell (10) of tested pipeline;
Be installed on this shell (10) inner in order to produce the vortex shedder (50) of vortex street;
Be installed on this vortex shedder (50) to measure the fiber laser (30) of vortex street frequency; And
One demodulated equipment, the tail optical fiber of described fiber laser (30), by being connected with this demodulated equipment after fairlead (11) extraction, makes this demodulated equipment carry out demodulation to the data that fiber laser (30) is measured;
Wherein, cylindrical in hollow of described shell (10), its sidewall has a fairlead (11), and the tail optical fiber of described fiber laser (30) is drawn by this fairlead (11); It is inner that described vortex shedder (50) is installed on this shell (10) by a crossbeam (52), and there are a center pit (51) in the central authorities of this vortex shedder (50), described fiber laser (30) is installed on this vortex shedder (50) by this center pit (51).
2. optical-fiber laser vortex shedding flow meter according to claim 1, it is characterized in that, described fiber laser (30) is fixed in this center pit (51) of vortex shedder (50), and described fiber laser (30) is suspended in fluid in order to the one end measuring vortex street frequency along fluid flow direction, tail optical fiber at one end passes through this fairlead (11) and draws.
3. optical-fiber laser vortex shedding flow meter according to claim 1, is characterized in that, the axis of described fiber laser (30) is consistent with the flow direction of fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210464791.4A CN102937465B (en) | 2012-11-16 | 2012-11-16 | Vortex street flow-meter using fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210464791.4A CN102937465B (en) | 2012-11-16 | 2012-11-16 | Vortex street flow-meter using fiber laser |
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| Publication Number | Publication Date |
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| CN102937465A CN102937465A (en) | 2013-02-20 |
| CN102937465B true CN102937465B (en) | 2015-06-17 |
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| CN201210464791.4A Active CN102937465B (en) | 2012-11-16 | 2012-11-16 | Vortex street flow-meter using fiber laser |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424104B (en) * | 2015-12-25 | 2018-07-06 | 燕山大学 | A kind of two-way self-correcting vortex street effect flow sensor |
| CN106153978B (en) * | 2016-06-20 | 2019-12-31 | 天津大学 | Flow velocity testing method based on fiber MEMS Fabry-Perot microcavity |
| CN112832741B (en) * | 2021-02-05 | 2021-10-26 | 江苏华尔威科技集团有限公司 | Oil well measuring system adopting Internet of things technology |
Citations (4)
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|---|---|---|---|---|
| CN2506985Y (en) * | 2001-11-08 | 2002-08-21 | 中国科学院西安光学精密机械研究所 | Optical fiber raster flow sensor |
| CN102135440A (en) * | 2011-01-11 | 2011-07-27 | 华澳富通(天津)科技发展有限公司 | Optical fiber vortex shedding flowmeter capable of simultaneously measuring temperature |
| CN102768048A (en) * | 2012-07-18 | 2012-11-07 | 昆明理工大学 | Fiber Bragg grating vortex shedding flow meter based on triangular prism-shaped vortex-forming body and using method thereof |
| CN202928625U (en) * | 2012-11-16 | 2013-05-08 | 中国科学院半导体研究所 | Optical fiber laser vortex flowmeter |
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- 2012-11-16 CN CN201210464791.4A patent/CN102937465B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2506985Y (en) * | 2001-11-08 | 2002-08-21 | 中国科学院西安光学精密机械研究所 | Optical fiber raster flow sensor |
| CN102135440A (en) * | 2011-01-11 | 2011-07-27 | 华澳富通(天津)科技发展有限公司 | Optical fiber vortex shedding flowmeter capable of simultaneously measuring temperature |
| CN102768048A (en) * | 2012-07-18 | 2012-11-07 | 昆明理工大学 | Fiber Bragg grating vortex shedding flow meter based on triangular prism-shaped vortex-forming body and using method thereof |
| CN202928625U (en) * | 2012-11-16 | 2013-05-08 | 中国科学院半导体研究所 | Optical fiber laser vortex flowmeter |
Non-Patent Citations (1)
| Title |
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| 光纤传感器及其在流量测控中的应用;华义祥等;《通用机械》;20050330(第3期);第54-57页 * |
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