CN211148688U - Liquid flow velocity detection device and system based on grating optical fiber - Google Patents
Liquid flow velocity detection device and system based on grating optical fiber Download PDFInfo
- Publication number
- CN211148688U CN211148688U CN201922357946.4U CN201922357946U CN211148688U CN 211148688 U CN211148688 U CN 211148688U CN 201922357946 U CN201922357946 U CN 201922357946U CN 211148688 U CN211148688 U CN 211148688U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- grating
- liquid flow
- fiber
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 80
- 239000007788 liquid Substances 0.000 title claims abstract description 71
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 59
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 15
- 230000003595 spectral effect Effects 0.000 abstract description 9
- 230000009471 action Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- -1 germanium ions Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
Images
Landscapes
- Light Guides In General And Applications Therefor (AREA)
Abstract
The utility model relates to a liquid flow velocity detection device and a system based on grating optical fiber, in particular to the field of flow velocity measurement, when the liquid flow velocity detection device detects the liquid flow velocity and liquid acts on the stress part, the stress part drives the fixed connecting part to move through the connecting rod under the action of the liquid, so that the first optical fiber, the second optical fiber and the optical fiber grating are stretched, and the resonance wavelength of the grating optical fiber is changed, so that the transmission spectral lines of the first optical fiber and the second optical fiber are changed, by detecting the transmission spectral lines of the emergent rays passing through the first optical fiber and the second optical fiber and according to the corresponding relation between the transmission spectral lines of the emergent rays and the deformation of the grating optical fiber, the deformation amount of the grating optical fiber is obtained, and obtaining the flow rate of the liquid to be measured according to the corresponding relation between the deformation quantity of the fiber bragg grating and the flow rate of the liquid.
Description
Technical Field
The utility model relates to a velocity of flow measurement field particularly, relates to a liquid velocity of flow detection device and system based on grating optic fibre.
Background
The flow velocity refers to the distance of gas or liquid flow particles passing through in unit time, the flow velocities of various points of water flow in channels and riverways are different, the flow velocities near the bottom and the edge of a river (canal) are small, the flow velocity near the water surface in the center of the river is the maximum, and for the sake of simple calculation, the cross-section average flow velocity is usually used to represent the velocity of the water flow at the cross section.
In the prior art, the flow rate of the liquid is mainly measured by the formula a ═ V/(T ×) where a denotes the flow rate of the liquid, T denotes the time, V denotes the volume of the liquid discharged during T, and S denotes the cross-sectional area of the pipe.
However, in the prior art, more parameters need to be measured when the flow rate is calculated, so that the calculation error of the flow rate is larger, and the calculated flow rate is inaccurate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a liquid velocity of flow detection device and system based on grating fiber to the not enough among the above-mentioned prior art to calculate the unsafe problem of velocity of flow that obtains among the solution prior art.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, the embodiment of the present invention provides a liquid flow velocity detection device based on grating fiber, the liquid flow velocity detection device includes: the optical fiber grating comprises a first optical fiber, a second optical fiber, a grating optical fiber, a fixed connecting part, a connecting rod and a stress part; first optic fibre and second optic fibre set up respectively at the both ends of grating optic fibre, and the one end that fixed connection portion joint is close to grating optic fibre at first optic fibre, and the one end of connecting rod is connected in one side of fixed connection portion, and the other end of connecting rod connects the atress portion.
Optionally, the force receiving portion is sheet-like in shape.
Optionally, the liquid flow rate detection device further comprises a rotating part, and the rotating part is arranged at the joint of the connecting rod and the force-bearing part.
Optionally, an included angle is provided between the link and the fixed connection portion.
Optionally, the included angle is 20 degrees to 90 degrees.
In a second aspect, the embodiment of the present invention provides another kind of liquid velocity detection system based on grating optical fiber, and the liquid velocity detection system includes: the measuring pipeline, the fixing part, the supporting part and the liquid flow velocity detecting device of any one of the first aspect, the fixing part is respectively perpendicular to the second optical fibers of the measuring pipeline and the liquid flow velocity detecting device, the supporting part is respectively perpendicular to the first optical fibers of the measuring pipeline and the liquid flow velocity detecting device, and the connecting rod and the stress part of the liquid flow velocity detecting device are deep into the measuring pipeline.
Optionally, the liquid flow velocity detection system further comprises a bracket, and the bracket is arranged on one side of the first optical fiber, the second optical fiber and the grating optical fiber, which is close to the measurement pipeline.
The utility model has the advantages that:
the application sets up first optic fibre and second optic fibre respectively at the both ends of grating optic fibre, fixed connection portion joint is in the one end that first optic fibre is close to the grating optic fibre, the one end of connecting rod is connected in one side of fixed connection portion, the other end of connecting rod connects the atress portion, when this liquid velocity of flow detection device detected the liquid velocity of flow, liquid acts on this atress portion, the atress portion is under the effect of liquid, drive fixed connection portion through the connecting rod and move, and then make this first optic fibre, the second optic fibre, the fiber grating is stretched, and then make the resonance wavelength of this grating optic fibre change, lead to the transmission spectral line of first optic fibre and second optic fibre to change, through detecting the transmission spectral line of the emergent ray through first optic fibre and second optic fibre, and according to the corresponding relation of the transmission spectral line of emergent ray and grating optic fibre deformation, obtain the deformation volume of this grating optic fibre, and obtaining the flow rate of the liquid to be measured according to the corresponding relation between the deformation quantity of the fiber bragg grating and the flow rate of the liquid.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a liquid flow velocity detection apparatus based on a grating optical fiber according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a liquid flow velocity detection system based on a grating optical fiber according to an embodiment of the present invention.
Icon: 10-a first optical fiber; 20-a grating fiber; 30-a second optical fiber; 40-a fixed connection; 50-a connecting rod; 60-a force-bearing portion; 70-a fixed part; 80-a support; 90-measuring the pipe.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is the utility model provides a liquid velocity of flow detection device's based on grating optical fiber structure schematic diagram, as shown in fig. 1, this application provides a liquid velocity of flow detection device based on grating optical fiber, and liquid velocity of flow detection device includes: the optical fiber comprises a first optical fiber 10, a second optical fiber 30, a grating optical fiber 20, a fixed connecting part 40, a connecting rod 50 and a stress part 60; the first optical fiber 10 and the second optical fiber 30 are respectively arranged at two ends of the grating optical fiber 20, the fixed connection portion 40 is clamped at one end of the first optical fiber 10 close to the grating optical fiber 20, one end of the connecting rod 50 is connected to one side of the fixed connection portion 40, and the other end of the connecting rod 50 is connected to the stress portion 60.
The first optical fiber 10, the second optical fiber 30 and the grating optical fiber 20 in the liquid flow velocity detection device may be single mode optical fibers or multimode optical fibers, and are not limited herein, the diameters of the first optical fiber 10, the second optical fiber 30 and the grating optical fiber 20 are generally the same, the respective lengths are set according to actual requirements, the fixed connection portion 40 may be connected to one end of the first optical fiber 10 close to the grating optical fiber 20, so that the force acting on the fixed connection portion 40 is transmitted to the first optical fiber 10, the second optical fiber 30 and the grating optical fiber 20 as much as possible, the loss of the force during the transmission process is reduced, the connection mode of the fixed connection portion 40 is clamping, a hole is drilled in the fixed connection portion 40, the first optical fiber 10 is clamped, the shape of the fixed connection portion 40 is generally a cuboid, a connecting rod 50 is connected to one side of the fixed connection portion 40, the other end of the connecting rod 50 is connected to a force receiving portion 60, the stress portion 60 is made of a rigid material and does not deform under the impact of liquid, the stress portion 60 may be sheet-shaped, rectangular or cylindrical, and is not specifically limited herein, when the liquid flow rate detection device detects the liquid flow rate and the liquid acts on the stress portion 60, the stress portion 60 drives the fixing connection portion 40 to move through the connection rod 50 under the action of the liquid, so that the first optical fiber 10, the second optical fiber 30 and the fiber grating are stretched, the resonance wavelength of the grating fiber 20 is changed, the transmission lines of the first optical fiber 10 and the second optical fiber 30 are changed, the deformation amount of the grating fiber 20 is obtained by detecting the transmission lines of the emergent light passing through the first optical fiber 10 and the second optical fiber 30 and according to the corresponding relationship between the transmission lines of the emergent light and the deformation of the grating fiber 20, the flow rate of the liquid to be measured is obtained according to the corresponding relationship between the deformation amount of the fiber grating and the flow rate of the liquid, it should be noted that the second optical fiber 30 is generally used as an optical fiber for incident light, the first optical fiber 10 is generally used as an optical fiber for emergent light, the corresponding relationship between the transmission line of the emergent light and the deformation of the grating optical fiber 20 is measured according to experimental measurement and is not specifically limited herein, and the corresponding relationship between the transmission line of the emergent light and the deformation of the grating optical fiber 20 is measured according to experimental measurement and is not specifically limited herein.
The term "fiber grating" is used to describe a fiber grating that uses the photosensitivity (permanent change in refractive index caused by the interaction of incident external photons with germanium ions in the core) of the fiber material to form a spatial phase grating in the core, which essentially forms (using the wavelength characteristics of bragg scattering from the spatial phase grating) a narrow-band (transmissive or reflective) filter or mirror in the core.
Alternatively, the force receiving portion 60 may be shaped as a sheet.
The fixed connection portion 40, the connecting rod 50 and the force receiving portion 60 form a lever structure, the general force receiving portion 60 is sheet-shaped, when liquid acts on the force receiving portion 60, the force receiving portion 60 can well convert resistance, and received force is transmitted to the fixed connection portion 40 through the connecting rod 50, optionally, the force receiving portion 60 can also be a sheet-shaped structure with a groove, namely, a groove is formed in the middle of the sheet-shaped force receiving portion 60.
Optionally, the liquid flow rate detecting device further includes a rotating portion provided at a junction of the link 50 and the force receiving portion 60.
This rotation portion sets up the junction at this connecting rod 50 and this atress portion 60, can rotate this atress portion 60 through this rotation portion, when the velocity of flow that awaits measuring is great, rotate this rotation portion, make the atress position of this atress portion 60 parallel with liquid flow direction, reduce the power that atress portion 60 received, prevent this atress portion 60 to damage, when the velocity of flow that awaits measuring is less, rotate this rotation portion, make the atress position of this atress portion 60 perpendicular with liquid flow direction, and then make the measurement to the liquid velocity of flow more accurate.
Optionally, an angle is provided between the link 50 and the fixed connection 40.
An included angle is provided between the link 50 and the fixed connection portion 40, so that the connection between the link 50 and the fixed connection portion 40 is more stable under the impact of force.
Optionally, the included angle is 20 degrees to 90 degrees.
Generally, the included angle between the link 50 and the fixed connection portion 40 is any one of 20 degrees, 30 degrees, 45 degrees, 60 degrees and 90 degrees, and when the included angle between the link 50 and the fixed connection portion 40 is 90 degrees, it is equivalent to that the link 50 is perpendicular to the fixed connection portion 40.
The application is through setting up first optic fibre 10 and second optic fibre 30 respectively at the both ends of grating optic fibre 20, fixed connection portion 40 joint is in the one end that first optic fibre 10 is close to grating optic fibre 20, the one end of connecting rod 50 is connected in one side of fixed connection portion 40, the other end of connecting rod 50 is connected atress portion 60, when this liquid velocity of flow detection device detected the liquid velocity of flow, liquid acts on this atress portion 60, atress portion 60 is under the effect of liquid, drive fixed connection portion 40 through connecting rod 50 and move, and then make this first optic fibre 10, second optic fibre 30, the fiber grating is stretched, and then make the resonance wavelength of this grating optic fibre 20 change, lead to the transmission spectral line of first optic fibre 10 and second optic fibre 30 to change, through detecting the transmission spectral line of the emergent ray through first optic fibre 10 and second optic fibre 30, and according to the corresponding relation of the transmission spectral line of emergent ray and the deformation of grating optic fibre 20, the deformation amount of the grating fiber 20 is obtained, and the flow rate of the liquid to be measured is obtained according to the corresponding relationship between the deformation amount of the fiber grating and the flow rate of the liquid.
Fig. 2 is a schematic structural diagram of a liquid flow velocity detection system based on a grating fiber provided in an embodiment of the present invention, as shown in fig. 2, the present application further provides a liquid flow velocity detection system based on a grating fiber, and the liquid flow velocity detection system includes: a measuring pipe 90, a fixing part 70, a supporting part 80 and the liquid flow velocity detecting device of any one of the above items, wherein the fixing part 70 is respectively arranged perpendicular to the measuring pipe 90 and the second optical fiber 30 of the liquid flow velocity detecting device, the supporting part 80 is respectively arranged perpendicular to the measuring pipe 90 and the first optical fiber 10 of the liquid flow velocity detecting device, and the connecting rod 50 and the stress part 60 of the liquid flow velocity detecting device are deeply inserted into the measuring pipe.
Optionally, the connection point of the link 50 to the upper duct wall, i.e. the pivot axis of the lever, is adjustable. This corresponds to adjusting the two arms of the lever and thus to adjusting the measuring range.
Optionally, a groove is provided above the support 80 through which the fiber passes, increasing the stability of the structure.
Optionally, the liquid flow velocity detection system further comprises a bracket disposed on a side of the first optical fiber 10, the second optical fiber 30 and the grating optical fiber 20 adjacent to the measurement conduit.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A grating fiber-based liquid flow velocity detection device, comprising: the optical fiber grating comprises a first optical fiber, a second optical fiber, a grating optical fiber, a fixed connecting part, a connecting rod and a stress part;
the first optical fiber and the second optical fiber are respectively arranged at two ends of the grating optical fiber, the fixed connecting portion is clamped at one end, close to the grating optical fiber, of the first optical fiber, one end of the connecting rod is connected to one side of the fixed connecting portion, and the other end of the connecting rod is connected to the stress portion.
2. The device according to claim 1, wherein the force-receiving portion is shaped like a sheet.
3. The grating-fiber-based liquid flow-velocity detecting device according to claim 2, further comprising a rotating portion provided at a junction of the connecting rod and the force receiving portion.
4. The apparatus according to claim 1, wherein an angle is formed between the connecting rod and the fixed connection portion.
5. The apparatus of claim 4, wherein the included angle is 20-90 degrees.
6. A grating fiber based liquid flow rate detection system, comprising: a measuring tube, a fixing portion, a supporting portion, and the liquid flow rate detecting device according to any one of claims 1 to 5, the fixing portion being disposed perpendicularly to the measuring tube and the second optical fiber of the liquid flow rate detecting device, respectively, the supporting portion being disposed perpendicularly to the measuring tube and the first optical fiber of the liquid flow rate detecting device, respectively, the link rod and the force receiving portion of the liquid flow rate detecting device being deep inside the measuring tube.
7. The fiber grating based liquid flow velocity detection system of claim 6, further comprising a support disposed on a side of the first fiber, the second fiber and the fiber grating proximate the measurement conduit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922357946.4U CN211148688U (en) | 2019-12-25 | 2019-12-25 | Liquid flow velocity detection device and system based on grating optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922357946.4U CN211148688U (en) | 2019-12-25 | 2019-12-25 | Liquid flow velocity detection device and system based on grating optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211148688U true CN211148688U (en) | 2020-07-31 |
Family
ID=71754562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922357946.4U Expired - Fee Related CN211148688U (en) | 2019-12-25 | 2019-12-25 | Liquid flow velocity detection device and system based on grating optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211148688U (en) |
-
2019
- 2019-12-25 CN CN201922357946.4U patent/CN211148688U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2126749A (en) | Optical fiber tap | |
| JPS6134091B2 (en) | ||
| EP1849014A1 (en) | Optical transit time velocimeter | |
| CN211148688U (en) | Liquid flow velocity detection device and system based on grating optical fiber | |
| Ahmed et al. | Fibre optic laser anemometry for turbomachinery applications | |
| CN105158508A (en) | Novel fiber vibration acceleration sensor with simple structure | |
| CN200993584Y (en) | Insertion optical-fiber turbo flowmeter | |
| CN201955102U (en) | Novel site adjustable optical fiber sensing device | |
| JP2011033411A (en) | Tilt angle measuring element and inclinometer | |
| CN107543936A (en) | Fiber grating flow rate of water flow sensor | |
| JPS6225268A (en) | Optical air speedometer | |
| RU2538437C1 (en) | Fibre-optic wind meter | |
| CN213120828U (en) | Optical power meter probe for rapidly butting optical fibers | |
| CN208654184U (en) | A kind of fibre optical sensor measuring micro-fluidic speed and direction based on TFBG | |
| CN209706769U (en) | Shaft coupling coaxality measuring mechanism | |
| US10823637B2 (en) | Devices, systems and methods for use in fiber measurements, such as multi-mode fiber geometry measurements | |
| CN210037866U (en) | High-sensitivity transverse acceleration testing device for fiber bragg grating | |
| CN109839211B (en) | Distributed optical fiber water body temperature and flow velocity distribution measuring device | |
| Li et al. | Two-dimensional vector accelerometer with single-channel measurement based on femtosecond laser direct-written cladding waveguides | |
| CN209181740U (en) | A kind of fiber cut face detection device | |
| CN201166261Y (en) | Optical fiber probe for detecting transparent liquid cutoff | |
| CN106289503A (en) | A kind of all-fiber ultrasound wave device for measuring sound intensity | |
| CN201269747Y (en) | Photo-electric tension wire coordinate apparatus | |
| CN103331317B (en) | Wire-drawing die fixing device | |
| CN109387167A (en) | A kind of fiber cut face detection device and detection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200731 |