CN203083620U - Optical fiber two-phase flow-meter - Google Patents
Optical fiber two-phase flow-meter Download PDFInfo
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- CN203083620U CN203083620U CN 201320063237 CN201320063237U CN203083620U CN 203083620 U CN203083620 U CN 203083620U CN 201320063237 CN201320063237 CN 201320063237 CN 201320063237 U CN201320063237 U CN 201320063237U CN 203083620 U CN203083620 U CN 203083620U
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Abstract
The utility model discloses an optical fiber two-phase flow-meter which comprises an outer case installed on a detected pipeline, a fixing beam installed inside the outer case, a fiber laser installed on the fixing beam and used for measuring flow, and a demodulation device installed outside the outer case and used for testing vibration signals detected by the fiber laser. As a way of arranging the fiber laser along the fluid direction is adopted, influence on the flow and a flow field of an original pipeline is reduced to the maximum. As the flow is measured through measurement of the vibration signals detected by the fiber laser, the optical fiber two-phase flow-meter ensures that a sensor can still work normally under the circumstance that the sensor contains sediment.
Description
Technical field
The utility model relates to the flow rate test field, relates in particular to a kind of optical fiber two-phase flow meter, is applicable to the flow of measuring two-phase 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.
People such as Li Chuan have proposed a kind of target type fiber grating liquid flowmeter (Chinese invention patent application 200910094845.0), the pressure on the choked flow target that this flowmeter adopts a series of transmission mechanisms such as choked flow target, connecting rod, cantilever that fluid is caused passes to fiber grating, and the variation by grating spectrum records flow.The deficiency of this design is: 1) the choked flow target has influenced flow field and the flow in original pipeline; 2) need to increase a mounting, strip hole etc. is set, technology and complex structure especially need this movable agency of connecting rod is sealed, and reliability is low.
People such as Zhang Qiang have proposed " the fiber grating liquid flow sensor of band temperature compensation " (Chinese invention patent application 200910229030.9) equally, adopt " elasticity tongue " to experience the pressure that fluid causes in this sensor, its deficiency is: 1) elasticity tongue itself can influence original ducted flow and flow field characteristic equally; 2) direction of fiber grating and flow direction are not parallel, and fluid flows and can produce extra-stress to fiber grating, thereby influences measuring accuracy.
Two kinds of top flowmeters that flowmeter all is a single-phase flow.Aspect polyphasic flow, patented claim 201110238251.X discloses a kind of multi-phase flowmeter that is used for the down-hole pipeline, its principle is the exit that two groups of intensity modulation type Fibre Optical Sensors is installed in oil country tubular good, measure the light reflectivity and the light transmission of crude oil respectively, through handling each the mutually shared ratio in the oil gas water three phase mixing material unit interval of to extrapolate, utilize the average discharge in the phase modulation-type fiber sensor measuring mixing material unit interval again, calculate the flow in each single-phase unit interval under a proportional relationship.The shortcoming of this scheme is will to have a strong impact on the light reflectivity and the light transmission of crude oil when being mixed with impurity such as silt in the fluid, thereby causes the inaccurate even flowmeter of flow measurement to lose efficacy.
Therefore, flowmeter is tried one's best influence the flow of former pipeline and flow field, the dependable flow meter becomes the problem that optical fibre flowmeter is needed solution at present badly in that contain under the situation of silt still can operate as normal littlely.
The utility model proposes a kind of optical fiber two-phase flow meter, be used for the monitoring of two-phase fluid flow, emphasis solves the existing fiber flowmeter can't contain the problem that can't work under the situation of silt.
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 two-phase flow meter, can't contain the problem that can't work under the situation of silt to solve the existing fiber flowmeter.
(2) technical scheme
For achieving the above object, the utility model provides a kind of optical fiber two-phase flow meter, and this optical fiber two-phase flow meter comprises: the shell 10 that is installed on tested pipeline; Be installed on the fixed beam 50 of shell 10 inside; Be installed on fixed beam 50 in order to measure the fiber laser 30 of flow; And be installed on the demodulated equipment 40 of shell 10 outsides in order to the detected vibration signal of measuring fiber laser instrument 30.
In the such scheme, an end of described optical fibre optical fibre laser instrument 30 is suspended in the fluid, and the other end is fixed in the center pit 51 of fixed beam 50 by optical fiber.
In the such scheme, the end that described optical fibre optical fibre laser instrument 30 is fixed in fixed beam 50 passes the center pit 51 of fixed beam 50 and the fairlead 11 on the shell 10 is connected in demodulated equipment 40.
In the such scheme, described fairlead 11 is opened on shell 10, is connected with demodulated equipment 40 in order to the tail optical fiber of drawing fiber laser 30.
(3) beneficial effect
From technique scheme as can be seen, the utlity model has following beneficial effect:
1, this optical fiber two-phase flow meter that provides of the utility model, the mode that adopts a fiber laser to arrange along flow direction has reduced flow and influence on flow field to former pipeline to greatest extent.
2, this optical fiber two-phase flow meter that provides of the utility model by in fixed beam 50 side of flow direction method that fiber laser is installed dorsad, makes fiber laser be parallel to direction of flow, has reduced the adjection of fluid to optical fiber.
3, this optical fiber two-phase flow meter that provides of the utility model is measured flow by the detected vibration signal of measuring optical fiber laser instrument, has guaranteed that sensor is in that contain still can operate as normal under the situation of silt.
Description of drawings
The synoptic diagram of the optical fiber two-phase flow meter that Fig. 1 provides for the utility model;
The synoptic diagram of the fixed beam 50 of the optical fiber two-phase flow meter that Fig. 2 provides for the utility model;
The fiber laser noise level of optical fiber two-phase flow meter when hanging down flow velocity that Fig. 3 provides for the utility model;
The fiber laser noise level of the optical fiber two-phase flow meter that Fig. 4 provides for the utility model when high flow rate.
The fiber laser detected vibration signal of optical fiber two-phase flow meter when Gao Shui/oil ratio is routine that Fig. 5 provides for the utility model.
The fiber laser detected vibration signal of the optical fiber two-phase flow meter that Fig. 6 provides for the utility model when low water/oil ratio example.
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. 2, the synoptic diagram of the optical fiber two-phase flow meter that Fig. 1 provides for the utility model; The synoptic diagram of the fixed beam 50 of the optical fiber two-phase flow meter that Fig. 2 provides for the utility model.This optical fiber two-phase flow meter comprises: the shell 10 that is installed on tested pipeline; Be installed on the fixed beam 50 of shell 10 inside; Be installed on fixed beam 50 in order to measure the fiber laser 30 of flow; Be installed on the demodulated equipment 40 of shell 10 outsides in order to the detected vibration signal of measuring fiber laser instrument 30.Wherein, one end of optical fibre optical fibre laser instrument 30 is suspended in the fluid, the other end is fixed in the center pit 51 of fixed beam 50 by optical fiber, and this end that is fixed in fixed beam 50 passes the center pit 51 of fixed beam 50 and the fairlead 11 on the shell 10 is connected in demodulated equipment 40.Fairlead 11 is opened on shell 10, is connected with demodulated equipment 40 in order to the tail optical fiber of drawing fiber laser 30.
The principle of work of the optical fiber two-phase flow meter that the utility model provides is that with reference to figure 1, Fig. 2, when fluid flowed in shell 10, the sectional area of fixed beam 50 in shell 10 was the smaller the better.Preferably, fixed beam 50 should be a streamlined slender beam structure.When fluid flow through in shell 10, fluid can cause that at the outside surface of fiber laser 30 pressure of faint variation rises and falls, and this pressure fluctuating can cause that the noise level of fiber laser 30 changes.When flow velocity increased, pressure rose and fell and becomes big, and the noise level of laser instrument also approximately linear ground increases (Fig. 3, Fig. 4).The fiber laser noise level of optical fiber two-phase flow meter when hanging down flow velocity that Fig. 3 provides for the utility model; The fiber laser noise level of the optical fiber two-phase flow meter that Fig. 4 provides for the utility model when high flow rate.
The tail optical fiber of fiber laser 30 inserts demodulated equipment 40.In demodulated equipment 40, can come the noise level of testing laser device by diverse ways such as interferometric method, process of heterodyning.Before measuring flow, the noise level of first Calibration of Laser device and the relation of flow can be come test traffic by the noise level of laser instrument.
Above-mentioned is the detection principle of fluid total flow, introduce below and how to detect the two-phase components in proportions, and be that oil/water is the example introduction with the two-phase of fluid.The fiber laser detected vibration signal of optical fiber two-phase flow meter when Gao Shui/oil ratio is routine that Fig. 5 provides for the utility model.The fiber laser detected vibration signal of the optical fiber two-phase flow meter that Fig. 6 provides for the utility model when low water/oil ratio example.When being mixed with a spot of water in the oil, water can cause that fiber laser periodically vibrates, and when the ratio of water was hanged down, the frequency that vibration takes place was also lower, as shown in Figure 6; When the ratio increase of water, during the content of approaching oil, the frequency of the generation of vibration increases thereupon, as shown in Figure 5.Therefore, when detecting two-phase flow, demarcate the frequency that fiber laser vibration that the content of heterogeneity causes takes place in advance, can detect the component ratio of two-phase.
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 (4)
1. an optical fiber two-phase flow meter is characterized in that, this optical fiber two-phase flow meter comprises:
Be installed on the shell (10) of tested pipeline;
Be installed on the inner fixed beam (50) of shell (10);
Be installed on fixed beam (50) in order to measure the fiber laser (30) of flow; And
Be installed on the demodulated equipment (40) of shell (10) outside in order to the detected vibration signal of measuring fiber laser instrument (30).
2. optical fiber two-phase flow meter according to claim 1 is characterized in that, an end of described optical fibre optical fibre laser instrument (30) is suspended in the fluid, and the other end is fixed in the center pit (51) of fixed beam (50) by optical fiber.
3. optical fiber two-phase flow meter according to claim 2, it is characterized in that the end that described optical fibre optical fibre laser instrument (30) is fixed in fixed beam (50) passes the center pit (51) of fixed beam (50) and the fairlead (11) on the shell (10) is connected in demodulated equipment (40).
4. optical fiber two-phase flow meter according to claim 3 is characterized in that, described fairlead (11) is opened on shell (10), is connected with demodulated equipment (40) in order to the tail optical fiber of drawing fiber laser (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320063237 CN203083620U (en) | 2013-02-04 | 2013-02-04 | Optical fiber two-phase flow-meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320063237 CN203083620U (en) | 2013-02-04 | 2013-02-04 | Optical fiber two-phase flow-meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203083620U true CN203083620U (en) | 2013-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320063237 Expired - Fee Related CN203083620U (en) | 2013-02-04 | 2013-02-04 | Optical fiber two-phase flow-meter |
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| Country | Link |
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| CN (1) | CN203083620U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148896A (en) * | 2013-02-04 | 2013-06-12 | 中国科学院半导体研究所 | Optical fiber two-phase flow meter |
| CN104197967A (en) * | 2014-08-20 | 2014-12-10 | 西北工业大学 | Double-ring coaxial optical fiber turbine flow meter and test method |
-
2013
- 2013-02-04 CN CN 201320063237 patent/CN203083620U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148896A (en) * | 2013-02-04 | 2013-06-12 | 中国科学院半导体研究所 | Optical fiber two-phase flow meter |
| CN104197967A (en) * | 2014-08-20 | 2014-12-10 | 西北工业大学 | Double-ring coaxial optical fiber turbine flow meter and test method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20150204 |
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| EXPY | Termination of patent right or utility model |