CN203083625U - Optical fiber floater flow-meter - Google Patents
Optical fiber floater flow-meter Download PDFInfo
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- CN203083625U CN203083625U CN 201320063933 CN201320063933U CN203083625U CN 203083625 U CN203083625 U CN 203083625U CN 201320063933 CN201320063933 CN 201320063933 CN 201320063933 U CN201320063933 U CN 201320063933U CN 203083625 U CN203083625 U CN 203083625U
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- measuring diaphragm
- float
- optical fiber
- floater
- flow
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Abstract
The utility model discloses an optical fiber floater flow-meter which comprises a fluid guiding pipe installed in a detected pipeline, a floater, a measuring diaphragm and a fiber grating, wherein the floater is installed inside the fluid guiding pipe and used for rotating and generating vibration under the effect of fluid, the measuring diaphragm is installed inside the fluid guiding pipe and used for sensing vibration generated by the floater, and the fiber grating with two ends fixed on the measuring diaphragm is used for measuring vibration frequency. As a method of arranging protrusions on the floater and pits on the measuring diaphragm is adopted, the optical fiber floater flow-meter improves vibration excitation of the floater on the measuring diaphragm and improves sensitivity of a sensor. As flow is measured through vibration generated by the floater instead of rotation and a fluid guiding groove is arranged, design of the flow-meter is simplified, and the flow-meter can measure small flow. As the flow is detected through measurement of wavelength change, caused by vibration generated by the floater, of the fiber grating on the measuring diaphragm, the problems that strength detection can not detect small signals and is severely interfered by the outside world are avoided.
Description
Technical field
The utility model relates to the flow measurement technology field, relates in particular to a kind of optical fiber suspended body flowmeter, is applicable to the flow of measuring 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, Chang Yong flow is in respect of target type meter, turbo flow meter, vortex shedding flow meter or the like.These flowmeters are to record power, rotating speed or vibration signal input analytical equipment by electric transducer to calculate mostly, draw flow number at last.But the electrical type sensor exists that sealing is poor, easily electric leakage, perishable, be subjected to problem 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 obtained increasing attention in recent years.But still there is more problem in present optical fibre flowmeter.
Disclose a kind of optical fiber suspended body flowmeter in the 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 influence of external environment is bigger, thereby causes that flow error is bigger.
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 big; 4) a lot of fluids have corrosive attack to fiber optic materials itself, and suitable type of fluid is limited.
That 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 vortex street generator back in this scheme, its deficiency is: 1) optical fiber is easy to be thrust by fluid when fluid viscosity is big; 2) a lot of fluids have corrosive attack to fiber optic materials itself, and suitable type of fluid is limited; 3) optical fiber impression is because the strain that the distortion of vortex street generator produces, rather than the displacement of the energy converter that causes of the eddy current of vortex street 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 influence of fluid itself, and improve flowmeter sensitivity and become the problem that optical fibre flowmeter is needed solution at present badly.
The utility model proposes a kind of optical fiber suspended body flowmeter, be used for the monitoring of fluid flow, emphasis solves optical fiber in the existing fiber flowmeter and is subjected to the influence of fluid itself and can't detects low discharge and problem that sensitivity has much room for improvement.
The utility model content
(1) technical matters that will solve
In view of this, fundamental purpose of the present utility model is to provide a kind of optical fiber suspended body flowmeter, is subjected to the influence 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 utility model provides a kind of optical fiber suspended body flowmeter, and 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 the measuring diaphragm 20 of mozzle 10 inside in order to the vibration experiencing float 50 and produce; And the fiber grating 30 in order to the measuring vibrations frequency is fixed on the measuring diaphragm 20 at two ends.
In the such scheme, the end face that described float 50 contacts with measuring diaphragm 20 further is provided with the projection 51 of the vibration of the measuring diaphragm 20 that causes in order to friction that reduces float 50 and measuring diaphragm 20 and enhancing float 50.
In the 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 the such scheme, the cross-sectional area of described measuring diaphragm 20 is less than the cross-sectional area of described float 50.
In the such scheme, described measuring diaphragm 20 further is provided with the rib 21 of symmetry, and fixing with mozzle 10 by rib 21.
In the such scheme, described measuring diaphragm 20 further is provided with depression 22, cooperates the vibration of the measuring diaphragm 20 that enhancing float 50 causes with the projection 51 of float 50.
In the such scheme, described fiber grating 30 is installed on the rib 21, to increase flowmeter sensitivity.
(3) beneficial effect
From technique scheme as can be seen, the utlity model has following beneficial effect:
1, this optical fiber suspended body flowmeter that provides of the utility model adopts increasing projection on the float and increase the method for depression 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 that provides of the utility model, measure flow by vibration rather than rotation that the measurement float causes, and, not only simplified the design of flowmeter, and guaranteed that flowmeter can detect the situation of low discharge by increasing the diversion trench of float.
3, this optical fiber suspended body flowmeter that provides of the utility model causes the wavelength variations of the fiber grating on the measuring diaphragm to detect flow by measuring the vibration that float causes, has avoided intensity detection can't detect small-signal and is subjected to the bigger problem of external interference.
Description of drawings
The synoptic diagram of the optical fiber suspended body flowmeter that Fig. 1 provides for the utility model;
Float 50 synoptic diagram in the optical fiber suspended body flowmeter that Fig. 2 provides for the utility model;
The vertical view of measuring diaphragm 20 in the optical fiber suspended body flowmeter that Fig. 3 provides for the utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer,, and, the utility model is further described with reference to accompanying drawing below in conjunction with specific embodiment.
Please refer to Fig. 1～Fig. 3, the synoptic diagram of the optical fiber suspended body flowmeter that Fig. 1 provides for the utility model; Float 50 synoptic diagram in the optical fiber suspended body flowmeter that Fig. 2 provides for the utility model; The vertical view of measuring diaphragm 20 in the optical fiber suspended body flowmeter that Fig. 3 provides for the utility model.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 the measuring diaphragm 20 of mozzle 10 inside in order to the vibration experiencing float 50 and produce; The fiber grating 30 in order to the measuring vibrations frequency is fixed on the measuring diaphragm 20 at two ends.
The end face that float 50 contacts with measuring diaphragm 20 further is provided with the friction that is used to reduce 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 the rib 21 of symmetry, and fixing with mozzle 10 by 21.Measuring diaphragm 20 can further be provided with depression 22, cooperates the vibration of the measuring diaphragm 20 that enhancing float 50 causes with the projection 51 of float 50.
Fiber grating 30 generally is installed on the rib 21, to increase flowmeter sensitivity.Fiber grating 30 has certain initial prestress.
The principle of work of the optical fiber suspended body flowmeter that the utility model provides is that with reference to figure 1, Fig. 2, Fig. 3, when fluid flowed in mozzle 10, float 50 floated in the equilibrium position under hydrokinetic effect and rotation (especially in the situation that diversion trench 52 is arranged).Measuring diaphragm 20 when float 50 rotation in the effect lower edge of float 50 perpendicular to the axis direction vibration of mozzle 10, and drive the fiber grating 30 that is mounted thereon and produce corresponding strain, cause 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 rotations, 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, therefore can strengthen the vibration of the measuring diaphragm 20 that float 50 causes around mozzle 10 axial rotations.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 that for wavelength-modulated type Fibre Optical Sensor, sensitive element is not limited to fiber grating, promptly 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; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the above only is a specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
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;
It is inner in order to rotation and vibrative float (50) under the effect of fluid to be installed on mozzle (10);
It is inner in order to experience the measuring diaphragm (20) of the vibration that float (50) produces to be installed on mozzle (10); And
The last 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 the projection (51) of the vibration of the measuring diaphragm (20) that causes in order to friction that reduces float (50) and measuring diaphragm (20) and enhancing float (50).
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 the rib (21) of symmetry, and fixing by rib (21) and mozzle (10).
6. optical fiber suspended body flowmeter according to claim 1 is characterized in that, described measuring diaphragm (20) further is provided with depression (22), cooperates 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 the rib (21), to increase flowmeter sensitivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320063933 CN203083625U (en) | 2013-02-04 | 2013-02-04 | Optical fiber floater flow-meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320063933 CN203083625U (en) | 2013-02-04 | 2013-02-04 | Optical fiber floater flow-meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203083625U true CN203083625U (en) | 2013-07-24 |
Family
ID=48829451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320063933 Withdrawn - After Issue CN203083625U (en) | 2013-02-04 | 2013-02-04 | Optical fiber floater flow-meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203083625U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162748A (en) * | 2013-02-04 | 2013-06-19 | 中国科学院半导体研究所 | Optical floater flowmeter |
-
2013
- 2013-02-04 CN CN 201320063933 patent/CN203083625U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162748A (en) * | 2013-02-04 | 2013-06-19 | 中国科学院半导体研究所 | Optical floater flowmeter |
| CN103162748B (en) * | 2013-02-04 | 2016-01-20 | 中国科学院半导体研究所 | A kind of optical floater flowmeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130724 Effective date of abandoning: 20160120 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130724 Effective date of abandoning: 20160120 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |