CN103162748A - Optical floater flowmeter - Google Patents
Optical floater flowmeter Download PDFInfo
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- CN103162748A CN103162748A CN2013100438971A CN201310043897A CN103162748A CN 103162748 A CN103162748 A CN 103162748A CN 2013100438971 A CN2013100438971 A CN 2013100438971A CN 201310043897 A CN201310043897 A CN 201310043897A CN 103162748 A CN103162748 A CN 103162748A
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Abstract
The invention discloses an optical floater flowmeter. The optical floater flowmeter comprises a honeycomb duct installed inside a detected pipeline, a floater installed inside the honeycomb duct and used for rotating and producing vibration under the function of fluid, a measuring diaphragm installed inside the honeycomb duct and used for sensing vibration produced by the floater, and a fiber bragg grating, wherein two ends of the fiber bragg grating are fixed on two ends of the measuring diaphragm and used for measuring vibration frequency. By adoption of the method of adding a protrusion on the floater and adding a pit on the measuring diaphragm, vibration inspiration of the floater is increased on the measuring diaphragm and sensitivity of a sensor is improved. Design of the flowmeter is simplified by measuring the evocable vibration of the floater rather than measuring flow by rotating and by adding a diversion trench of the floater, the situation that the flowmeter can be used for measuring the small flow can be guaranteed. The flow is measured by measuring the change of wavelength of the fiber bragg grating on the measuring diaphragm caused by the evocable vibration of the floater, the problems that a small signal can not be detected by strength testing and external disturbance is large can be avoided.
Description
Technical field
The present invention relates to the flow measurement technology field, relate in particular to a kind of optical fiber suspended body flowmeter, be applicable to measure the flow of fluid.
Background technology
In a lot of fields of commercial production and people's lives, all need the flow of convection cell to monitor.At present, flow commonly used is in respect of target type meter, turbo flow meter, vortex shedding flow meter etc.These flowmeters are to record power, rotating speed or vibration signal input analytical equipment by electric transducer to calculate mostly, draw at last flow number.But, the electrical type sensor exist poor, the easy electric leakage of sealing, perishable, be subjected to the problems such as electromagnetic interference (EMI).
Fibre Optical Sensor adopts optical fiber to carry out sensing and transmission, does not have the problems referred to above, has therefore in recent years obtained increasing attention.But still there is more problem in present optical fibre flowmeter.
Disclose a kind of optical fiber suspended body flowmeter in patent 200620046512.2, adopted the method for intensity modulated.When flow hour, the output of this sensor is very little, can't detect low discharge.And light path receives that the impact of external environment is larger, thereby causes that flow error is larger.
The people such as Zhao Dong have proposed the design (Zhao Dong etc. of optical fiber suspended body flowmeter, " based on the full optical fiber flux of vortex street measuring method of white light interference principle; " Chinese journal of scientific instrument, 2011), this eddy currents flowmeter adopts optical fiber to arrange perpendicular to flowing to, and the pressure by fluid changes fiber lengths.Its deficiency is: 1) optical fiber itself is as bluff body, and stressed little, sensitivity is low, especially the situation of low discharge; 2) sensor comprises a fibre optic interferometer, system complex; 3) optical fiber is easy to be thrust by fluid when fluid viscosity is larger; 4) a lot of fluids have corrosive attack to fiber optic materials itself, and applicable type of fluid is limited.
That the people such as Zheng Lunjia disclose is a kind of " comprising the Karman vortex flow meter assembly of fiber Bragg grating sensor and the method for measuring rate of flow of fluid " (Chinese patent application number 200780047600.1), arrange fiber grating in this scheme in the vortex generator back, its deficiency is: 1) optical fiber is easy to be thrust by fluid when fluid viscosity is larger; 2) a lot of fluids have corrosive attack to fiber optic materials itself, and applicable type of fluid is limited; 3) optical fiber impression is the strain that produces due to the vortex generator distortion, rather than the displacement of the energy converter that causes of the eddy current of vortex generator generation, so sensitivity is lower; 4) vortex street is difficult to produce when flow is little, therefore can't measure low discharge.
Therefore, how to protect optical fiber not to be subjected to the impact of fluid itself, and the sensitivity that improves flowmeter become the problem that optical fibre flowmeter is needed solution at present badly.
The present invention proposes a kind of optical fiber suspended body flowmeter, is used for the monitoring of fluid flow, and emphasis solves optical fiber in the existing fiber flowmeter and is subjected to the impact of fluid itself and can't detects low discharge and problem that sensitivity has much room for improvement.
Summary of the invention
The technical matters that (one) will solve
In view of this, fundamental purpose of the present invention is to provide a kind of optical fiber suspended body flowmeter, is subjected to the impact of fluid itself and can't detects low discharge and problem that sensitivity has much room for improvement to solve optical fiber in the existing fiber flowmeter.
(2) technical scheme
For achieving the above object, the invention provides a kind of optical fiber suspended body flowmeter, this optical fiber suspended body flowmeter comprises: the mozzle 10 that is installed on tested pipeline; Be installed on mozzle 10 inside in order to rotation and vibrative float 50 under the effect of fluid; Be installed on mozzle 10 inside in order to the measuring diaphragm 20 of the vibration experiencing float 50 and produce; And the fiber grating 30 in order to the measuring vibrations frequency is fixed on measuring diaphragm 20 at two ends.
In such scheme, the end face that described float 50 contacts with measuring diaphragm 20 further is provided with to reduce the friction of float 50 and measuring diaphragm 20 and strengthens the projection 51 of the vibration of the measuring diaphragm 20 that float 50 causes.
In such scheme, described float 50 is a frustum cone structure, further is provided with the diversion trench 52 of the rotation of the float 50 that causes in order to enhance fluid in its side.
In such scheme, the cross-sectional area of described measuring diaphragm 20 is less than the cross-sectional area of described float 50.
In such scheme, described measuring diaphragm 20 further is provided with symmetrical rib 21, and fixing with mozzle 10 by rib 21.
In such scheme, described measuring diaphragm 20 further is provided with depression 22, coordinates the vibration of the measuring diaphragm 20 that enhancing float 50 causes with the projection 51 of float 50.
In such scheme, described fiber grating 30 is installed on rib 21, to increase the sensitivity of flowmeter.
(3) beneficial effect
Can find out from technique scheme, the present invention has following beneficial effect:
1, this optical fiber suspended body flowmeter provided by the invention adopts increasing projection on float and increase the method that caves on measuring diaphragm, has increased the vibrational excitation of float to measuring diaphragm, the sensitivity that has improved sensor.
2, this optical fiber suspended body flowmeter provided by the invention, the vibration rather than the rotation that cause by the measurement float come measuring flow, and by increasing the diversion trench of float, not only simplified the design of flowmeter, and guaranteed that flowmeter can detect the situation of low discharge.
3, this optical fiber suspended body flowmeter provided by the invention, the vibration that causes by the measurement float causes the wavelength variations of the fiber grating on measuring diaphragm to detect flow, has avoided intensity detection can't detect small-signal and has been subject to the larger problem of external interference.
Description of drawings
Fig. 1 is the schematic diagram of optical fiber suspended body flowmeter provided by the invention;
Fig. 2 is float 50 schematic diagram in optical fiber suspended body flowmeter provided by the invention;
Fig. 3 is the vertical view of measuring diaphragm 20 in optical fiber suspended body flowmeter provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, 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～Fig. 3, Fig. 1 is the schematic diagram of optical fiber suspended body flowmeter provided by the invention; Fig. 2 is float 50 schematic diagram in optical fiber suspended body flowmeter provided by the invention; Fig. 3 is the vertical view of measuring diaphragm 20 in optical fiber suspended body flowmeter provided by the invention.This optical fiber suspended body flowmeter comprises: the mozzle 10 that is installed on tested pipeline; Be installed on mozzle 10 inside in order to rotation and vibrative float 50 under the effect of fluid; Be installed on mozzle 10 inside in order to the measuring diaphragm 20 of the vibration experiencing float 50 and produce; The fiber grating 30 in order to the measuring vibrations frequency is fixed on measuring diaphragm 20 at two ends.
The end face that float 50 contacts with measuring diaphragm 20 further is provided be used to the friction that reduces float 50 and measuring diaphragm 20 and strengthens the projection 51 of the vibration of the measuring diaphragm 20 that float 50 causes.Float 50 is a frustum cone structure, further is provided with the diversion trench 52 of the rotation of the float 50 that causes in order to enhance fluid in its side.
The cross-sectional area of measuring diaphragm 20 is less than the cross-sectional area of float 50.Measuring diaphragm 20 can further be provided with symmetrical rib 21, and fixing with mozzle 10 by 21.Measuring diaphragm 20 can further be provided with depression 22, coordinates the vibration of the measuring diaphragm 20 that enhancing float 50 causes with the projection 51 of float 50.
The principle of work of optical fiber suspended body flowmeter provided by the invention is that with reference to figure 1, Fig. 2, Fig. 3, when fluid flowed in mozzle 10, float 50 floated under hydrokinetic effect in the equilibrium position and rotation (especially in the situation that diversion trench 52 is arranged).Measuring diaphragm 20 vibrates along the axis direction perpendicular to mozzle 10 under the effect of float 50 when float 50 rotation, and drives the fiber grating 30 corresponding strains of generation that are mounted thereon, and causes that the output light wavelength of fiber grating 30 changes.
The end face that float 50 contacts with measuring diaphragm 20 can further be provided with projection 51, and measuring diaphragm 20 can further be provided with depression 22.When float 50 rotation, the projection 51 of float 50 can be absorbed in depression 22 under the effect of fluid flow forces, when float continues rotation, projection 51 is again from 22 back-outs of caving in, thereby make float 50 change vertically vibration into around the axial rotation of mozzle 10, therefore can strengthen the vibration of the measuring diaphragm 20 that float 50 causes.The frequency of this vibration is consistent with the rotating speed of float 50, and the rotating speed of float 50 and flow are proportional, and the vibration frequency of measurement that therefore can be by checking fiber grating 30 records flow.
Need to prove, for wavelength-modulated type Fibre Optical Sensor, sensitive element is not limited to fiber grating, and namely fiber grating 30 can be replaced by other device and obtain same effect, other device such as fiber laser, long-period gratings, chirp grating etc.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above 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 modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. an optical fiber suspended body flowmeter, is characterized in that, this optical fiber suspended body flowmeter comprises:
Be installed on the mozzle (10) of tested pipeline;
Be installed on mozzle (10) inner in order to rotation and vibrative float (50) under the effect of fluid;
Be installed on mozzle (10) inner in order to experience the measuring diaphragm (20) of the vibration that float (50) produces; And
The upper fiber grating (30) in order to the measuring vibrations frequency of measuring diaphragm (20) is fixed at two ends.
2. optical fiber suspended body flowmeter according to claim 1, it is characterized in that, the end face that described float (50) contacts with measuring diaphragm (20) further is provided with to reduce the friction of float (50) and measuring diaphragm (20) and strengthens the projection (51) of the vibration of the measuring diaphragm (20) that float (50) causes.
3. optical fiber suspended body flowmeter according to claim 1, is characterized in that, described float (50) is a frustum cone structure, further is provided with the diversion trench (52) of the rotation of the float (50) that causes in order to enhance fluid in its side.
4. optical fiber suspended body flowmeter according to claim 1, is characterized in that, the cross-sectional area of described measuring diaphragm (20) is less than the cross-sectional area of described float (50).
5. optical fiber suspended body flowmeter according to claim 1, is characterized in that, described measuring diaphragm (20) further is provided with symmetrical rib (21), and fixing by rib (21) and mozzle (10).
6. optical fiber suspended body flowmeter according to claim 1, it is characterized in that, described measuring diaphragm (20) further is provided with depression (22), coordinates the vibration of the measuring diaphragm (20) that enhancing float (50) causes with the projection (51) of float (50).
7. optical fiber suspended body flowmeter according to claim 1 or 5, is characterized in that, described fiber grating (30) is installed on rib (21), to increase the sensitivity of flowmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310043897.1A CN103162748B (en) | 2013-02-04 | 2013-02-04 | A kind of optical floater flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310043897.1A CN103162748B (en) | 2013-02-04 | 2013-02-04 | A kind of optical floater flowmeter |
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| CN103162748A true CN103162748A (en) | 2013-06-19 |
| CN103162748B CN103162748B (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310043897.1A Expired - Fee Related CN103162748B (en) | 2013-02-04 | 2013-02-04 | A kind of optical floater flowmeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547379A (en) * | 2015-12-22 | 2016-05-04 | 中国石油天然气股份有限公司 | Petroleum underground flowmeter based on dual-polarization-state optical fiber device |
| CN108627204A (en) * | 2018-06-08 | 2018-10-09 | 合肥利都自动化仪表有限公司 | A kind of spinner flowmeter with convertible rotation float |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5743138A (en) * | 1997-01-22 | 1998-04-28 | Chartered Semiconductor Manufacturing Ltd. | Spirally fluted float |
| CN1229911A (en) * | 1998-03-20 | 1999-09-29 | 中国科学院西安光学精密机械研究所 | Method and device for detecting flow of pipeline pulverized coal |
| JPH11325986A (en) * | 1998-05-15 | 1999-11-26 | Wako Pure Chem Ind Ltd | Apparatus for preventing foreign matter from adhering flow-meter scale |
| CN200958952Y (en) * | 2006-09-29 | 2007-10-10 | 中国船舶重工集团公司第七一一研究所 | Float flowmeter |
| CN201016757Y (en) * | 2007-03-16 | 2008-02-06 | 程丽坤 | Antistatic rotary flow-meter |
| CN101285845A (en) * | 2007-04-11 | 2008-10-15 | 中国科学院半导体研究所 | Cantilever beam type optical fibre grating accelerometer |
| CN102288261A (en) * | 2011-07-19 | 2011-12-21 | 赵恩国 | Floating pontoon type fiber liquid level meter |
| CN102384772A (en) * | 2010-08-25 | 2012-03-21 | 西安金和光学科技有限公司 | Optical fiber type flow monitoring device |
| CN203083625U (en) * | 2013-02-04 | 2013-07-24 | 中国科学院半导体研究所 | Optical fiber floater flow-meter |
-
2013
- 2013-02-04 CN CN201310043897.1A patent/CN103162748B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5743138A (en) * | 1997-01-22 | 1998-04-28 | Chartered Semiconductor Manufacturing Ltd. | Spirally fluted float |
| CN1229911A (en) * | 1998-03-20 | 1999-09-29 | 中国科学院西安光学精密机械研究所 | Method and device for detecting flow of pipeline pulverized coal |
| JPH11325986A (en) * | 1998-05-15 | 1999-11-26 | Wako Pure Chem Ind Ltd | Apparatus for preventing foreign matter from adhering flow-meter scale |
| CN200958952Y (en) * | 2006-09-29 | 2007-10-10 | 中国船舶重工集团公司第七一一研究所 | Float flowmeter |
| CN201016757Y (en) * | 2007-03-16 | 2008-02-06 | 程丽坤 | Antistatic rotary flow-meter |
| CN101285845A (en) * | 2007-04-11 | 2008-10-15 | 中国科学院半导体研究所 | Cantilever beam type optical fibre grating accelerometer |
| CN102384772A (en) * | 2010-08-25 | 2012-03-21 | 西安金和光学科技有限公司 | Optical fiber type flow monitoring device |
| CN102288261A (en) * | 2011-07-19 | 2011-12-21 | 赵恩国 | Floating pontoon type fiber liquid level meter |
| CN203083625U (en) * | 2013-02-04 | 2013-07-24 | 中国科学院半导体研究所 | Optical fiber floater flow-meter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547379A (en) * | 2015-12-22 | 2016-05-04 | 中国石油天然气股份有限公司 | Petroleum underground flowmeter based on dual-polarization-state optical fiber device |
| CN105547379B (en) * | 2015-12-22 | 2019-08-06 | 中国石油天然气股份有限公司 | Petroleum underground flowmeter based on dual-polarization-state optical fiber device |
| CN108627204A (en) * | 2018-06-08 | 2018-10-09 | 合肥利都自动化仪表有限公司 | A kind of spinner flowmeter with convertible rotation float |
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| CN103162748B (en) | 2016-01-20 |
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