CN112362903A - Flow velocity detection device based on optical fiber coupling - Google Patents
Flow velocity detection device based on optical fiber coupling Download PDFInfo
- Publication number
- CN112362903A CN112362903A CN202011206869.3A CN202011206869A CN112362903A CN 112362903 A CN112362903 A CN 112362903A CN 202011206869 A CN202011206869 A CN 202011206869A CN 112362903 A CN112362903 A CN 112362903A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- flow velocity
- noble metal
- coupling
- hole
- 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.)
- Withdrawn
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Abstract
The invention provides a flow velocity detection device based on optical fiber coupling, which comprises a cavity, a first optical fiber and a second optical fiber, wherein the cavity is encircled into a pipeline, a first through hole and a second through hole are respectively arranged on opposite surfaces of the cavity, the first optical fiber penetrates through the first through hole, the second optical fiber penetrates through the second through hole, the first optical fiber and the second optical fiber are opposite in the pipeline, and a gap is arranged between the end surface of the first optical fiber and the end surface of the second optical fiber. The invention has the advantage of high flow velocity detection precision. In addition, the invention is based on the optical fiber, and has simple optical path and simple and convenient operation.
Description
Technical Field
The invention relates to the field of flow velocity detection, in particular to a flow velocity detection device based on optical fiber coupling.
Background
The flow rate refers to the displacement of the liquid per unit time. The existing flow velocity detection device is provided with a pitot tube, a propeller type flow velocity meter and the like. The conventional flow velocity detection device has low detection accuracy.
Disclosure of Invention
In order to solve the above problems, the present invention provides a flow velocity detection device based on optical fiber coupling, which includes a cavity, a first optical fiber, and a second optical fiber, wherein the cavity encloses a pipeline, opposite surfaces of the cavity are respectively provided with a first through hole and a second through hole, the first optical fiber penetrates through the first through hole, the second optical fiber penetrates through the second through hole, the first optical fiber and the second optical fiber are opposite in the pipeline, and a gap is provided between an end surface of the first optical fiber and an end surface of the second optical fiber.
Furthermore, in the pipeline, the first optical fiber and the second optical fiber are micro-nano optical fibers.
Further, the width of the gap is less than 1 micron.
Further, the first and second optical fibers are tapered within the conduit.
Furthermore, in the pipeline, the first optical fiber and the second optical fiber are in a frustum shape, and the diameters of the end face of the first optical fiber and the end face of the second optical fiber are smaller than those of other parts.
Further, noble metal particles are provided on the end surface of the first optical fiber, and noble metal particles are provided on the end surface of the second optical fiber.
Further, the material of the noble metal particles is gold.
Further, the noble metal particles have a diameter of greater than 40 nanometers and less than 100 nanometers.
Further, the noble metal particle is plural.
Further, the noble metal particles are arranged periodically.
The invention has the beneficial effects that: the invention provides a flow velocity detection device based on optical fiber coupling, which comprises a cavity, a first optical fiber and a second optical fiber, wherein the cavity is encircled into a pipeline, a first through hole and a second through hole are respectively arranged on opposite surfaces of the cavity, the first optical fiber penetrates through the first through hole, the second optical fiber penetrates through the second through hole, the first optical fiber and the second optical fiber are opposite in the pipeline, and a gap is arranged between the end surface of the first optical fiber and the end surface of the second optical fiber. When the optical fiber is used, the light source emits laser, the laser is coupled into the first optical fiber, the first optical fiber and the second optical fiber are optically coupled, and the optical detector detects the laser emitted from the second optical fiber. The fluid acts on the first optical fiber and the second optical fiber, so that the width of the gap or the relative position of the end face of the first optical fiber and the end face of the second optical fiber is changed, the laser emitted from the second optical fiber is changed, and the flow velocity measurement is realized by detecting the change of the laser emitted from the second optical fiber. The invention has the advantage of high flow velocity detection accuracy because the coupling between the two optical fibers is very sensitive to the relative position and distance between the end faces of the two optical fibers. In addition, the invention is based on the optical fiber, and has simple optical path and simple and convenient operation.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a flow velocity detection device based on optical fiber coupling.
Fig. 2 is a schematic diagram of another flow velocity detection device based on optical fiber coupling.
Fig. 3 is a schematic diagram of another flow velocity detection device based on optical fiber coupling.
Fig. 4 is a schematic diagram of another flow velocity detection device based on optical fiber coupling.
In the figure: 1. a cavity; 2. a pipeline; 3. a first optical fiber; 4. a second optical fiber; 5. a gap; 6. noble metal particles.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example 1
The invention provides a flow velocity detection device based on optical fiber coupling. As shown in fig. 1, the flow velocity detection device based on fiber coupling includes a cavity 1, a first optical fiber 3, and a second optical fiber 4. The cavity 1 encloses a pipeline 2, and a first through hole and a second through hole are respectively arranged on the opposite surfaces of the cavity 1. The cross section of the chamber 1 may be rectangular or square, and is not limited herein. When the cross section of the chamber 1 is rectangular, the first through-hole and the second through-hole are provided on opposite surfaces of the chamber 1. The first optical fiber 3 penetrates the first through hole, and the second optical fiber 4 penetrates the second through hole. That is, the first optical fiber 3 extends into the conduit 2 from the first through hole, and the second optical fiber 4 extends into the conduit 2 from the second through hole. In the duct 2, the first optical fiber 3 and the second optical fiber 4 are opposed, and a gap 5 is provided between an end face of the first optical fiber 3 and an end face of the second optical fiber 4. That is, the first optical fiber 3 and the second optical fiber 4 are on the same straight line within the tube 2. In the pipeline 2, the first optical fiber 3 and the second optical fiber 4 are micro-nano optical fibers. This, on the one hand, facilitates a greater deflection under the action of the fluid; on the other hand, in order to enhance the sensitivity of the coupling to the position of the second optical fiber 4 with respect to the first optical fiber 3. The width of the gap 5 is less than 1 micron in order to enhance the coupling and the effect of the relative position between the first and second optical fibres 3, 4 on the coupling.
When the optical fiber is used, the light source emits laser, the laser is coupled into the first optical fiber 3, the first optical fiber 3 and the second optical fiber 4 are optically coupled, and the optical detector detects the laser emitted from the second optical fiber 4. The light source may emit monochromatic laser light or continuous spectrum laser light. When the light source emits monochromatic laser light, the light detector detects the intensity of the laser light emitted from the second optical fiber 4; when the light source emits continuous spectrum laser light, the photodetector detects the transmission spectrum of the laser light emitted from the second optical fiber 4. The fluid acts on the first optical fiber 3 and the second optical fiber 4 to change the width of the gap 5 or the relative position of the end face of the first optical fiber 3 and the end face of the second optical fiber 4, thereby changing the laser light emitted from the second optical fiber 4, and the flow rate measurement is realized by detecting the change of the laser light emitted from the second optical fiber 4. The invention has the advantage of high flow velocity detection accuracy because the coupling between the two optical fibers is very sensitive to the relative position and distance between the end faces of the two optical fibers. In addition, the invention is based on the optical fiber, and has simple optical path and simple and convenient operation.
Example 2
Based on example 1, as shown in fig. 2, in the pipe 2, the first optical fiber 3 and the second optical fiber 4 are tapered. Thus, light exits from the vicinity of the apex of the first optical fiber 3 and is coupled into the second optical fiber 4 from the vicinity of the apex of the second optical fiber 4. Since the relative areas of the first optical fiber 3 and the second optical fiber 4 are small, the optical coupling between the first optical fiber 3 and the second optical fiber 4 is more sensitive to the position therebetween, so the present embodiment can achieve a flow velocity detection with higher accuracy.
Example 3
In example 1, as shown in fig. 3, the first optical fiber 3 and the second optical fiber 4 are tapered in the pipe 2, and the end surfaces of the first optical fiber 3 and the second optical fiber 4 have diameters smaller than those of other portions. That is, the diameter of the first optical fiber 3 gradually decreases from the wall of the cavity 1 to the end face of the first optical fiber 3; the diameter of the second optical fiber 3 gradually decreases from the wall of the cavity 1 to the end face of the second optical fiber 4. In this way, the relative area of the first optical fiber 3 and the second optical fiber 4 is small, and the optical coupling between the first optical fiber 3 and the second optical fiber 4 depends on the distance and the relative position relationship between the two, so the embodiment has the advantage of high flow velocity detection accuracy. Arranging the end faces of the first optical fibre 3 and the second optical fibre 4 to be planar reduces damage to the tip of the first optical fibre 3 or the second optical fibre 4 by fluid and increases the lifetime of the device.
Example 4
In example 3, as shown in fig. 4, the noble metal particles 6 were provided on the end surface of the first optical fiber 3, and the noble metal particles 6 were provided on the end surface of the second optical fiber 4. The material of the noble metal particles 6 is gold. The noble metal particles 6 are plural, and the noble metal particles 6 are periodically arranged. Thus, the laser light in the first optical fiber 3 excites the noble metal particles 6 on the end surface thereof to cause surface plasmon resonance, and also excites the noble metal particles 6 on the end surface of the second optical fiber 4 to cause surface plasmon resonance. Under the action of the fluid, the positional relationship between the first optical fiber 3 and the second optical fiber 4 is changed, so that the positional relationship between the noble metal particles 6 on the end surface of the first optical fiber 3 and the noble metal particles 6 on the end surface of the second optical fiber 4 is changed, the surface plasmon resonance frequency of the noble metal particles 6 on the end surface of the first optical fiber 3 is changed, the surface plasmon resonance frequency of the noble metal particles 6 on the end surface of the second optical fiber 4 is also changed, and the transmission spectrum of the laser emitted from the second optical fiber 4 is changed. Flow velocity detection is achieved by detecting the shift of the formants in the transmitted spectrum. This embodiment has an advantage of high accuracy of flow velocity detection because the resonance wavelength or the resonance frequency is very sensitive to the environment around the noble metal particle 6.
Further, the noble metal particles 6 have a diameter of more than 40 nm and less than 100 nm for detection using a visible light detector.
Further, inside the tube 2, the diameter of the first optical fiber 3 is different from the diameter of the second optical fiber 4. Thus, under the action of the fluid, the deflection angles of the first optical fiber 3 and the second optical fiber 4 are different, so that the position of the first optical fiber 3 relative to the second optical fiber 4 is changed more, the intensity of the laser light emitted from the second optical fiber 4 or the position of a resonance peak in a transmission spectrum is changed more, and the flow velocity detection with higher precision is realized.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A flow velocity detection device based on optical fiber coupling, comprising: the cavity is surrounded into a pipeline, a first through hole and a second through hole are formed in opposite surfaces of the cavity respectively, the first optical fiber penetrates through the first through hole, the second optical fiber penetrates through the second through hole, the first optical fiber and the second optical fiber are opposite in the pipeline, and a gap is formed between the end surface of the first optical fiber and the end surface of the second optical fiber.
2. The optical fiber coupling-based flow velocity sensing device according to claim 1, wherein: in the pipeline, the first optical fiber and the second optical fiber are micro-nano optical fibers.
3. The optical fiber coupling-based flow velocity sensing device according to claim 2, wherein: the width of the gap is less than 1 micron.
4. The optical fiber coupling-based flow velocity sensing device according to any one of claims 1 to 3, wherein: within the conduit, the first and second optical fibers are tapered.
5. The optical fiber coupling-based flow velocity sensing device according to any one of claims 1 to 3, wherein: in the pipeline, the first optical fiber and the second optical fiber are in a frustum shape, and the diameters of the end face of the first optical fiber and the end face of the second optical fiber are smaller than those of other parts.
6. The optical fiber coupling-based flow velocity sensing device according to claim 5, wherein: and the end face of the first optical fiber is provided with noble metal particles, and the end face of the second optical fiber is provided with noble metal particles.
7. The optical fiber coupling-based flow velocity sensing device according to claim 6, wherein: the material of the noble metal particles is gold.
8. The optical fiber coupling-based flow velocity sensing device according to claim 7, wherein: the noble metal particles have a diameter greater than 40 nanometers and less than 100 nanometers.
9. The optical fiber coupling-based flow velocity sensing device according to claim 8, wherein: the noble metal particle is plural.
10. The optical fiber coupling-based flow velocity sensing device according to claim 9, wherein: the noble metal particles are periodically arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011206869.3A CN112362903A (en) | 2020-11-03 | 2020-11-03 | Flow velocity detection device based on optical fiber coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011206869.3A CN112362903A (en) | 2020-11-03 | 2020-11-03 | Flow velocity detection device based on optical fiber coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112362903A true CN112362903A (en) | 2021-02-12 |
Family
ID=74512697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011206869.3A Withdrawn CN112362903A (en) | 2020-11-03 | 2020-11-03 | Flow velocity detection device based on optical fiber coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112362903A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113776723A (en) * | 2021-09-30 | 2021-12-10 | 云南师范大学 | Optical fiber air pressure detector based on optical coupling change |
| CN114414485A (en) * | 2022-01-19 | 2022-04-29 | 浙江树人学院（浙江树人大学） | Hydrogen detector based on elastic optical fiber |
| CN114545027A (en) * | 2022-01-27 | 2022-05-27 | 之江实验室 | All-optical flow velocity sensor |
-
2020
- 2020-11-03 CN CN202011206869.3A patent/CN112362903A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113776723A (en) * | 2021-09-30 | 2021-12-10 | 云南师范大学 | Optical fiber air pressure detector based on optical coupling change |
| CN113776723B (en) * | 2021-09-30 | 2023-09-19 | 云南师范大学 | Optical fiber air pressure detector based on optical coupling change |
| CN114414485A (en) * | 2022-01-19 | 2022-04-29 | 浙江树人学院（浙江树人大学） | Hydrogen detector based on elastic optical fiber |
| CN114414485B (en) * | 2022-01-19 | 2023-12-05 | 浙江树人学院（浙江树人大学） | Hydrogen detector based on elastic optical fiber |
| CN114545027A (en) * | 2022-01-27 | 2022-05-27 | 之江实验室 | All-optical flow velocity sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112362903A (en) | Flow velocity detection device based on optical fiber coupling | |
| Raatikainen et al. | Fiber-optic liquid-level sensor | |
| JP6297064B2 (en) | Non-contact pressure measurement optical sensor | |
| EP1664802A1 (en) | Optical flow meter for measuring gases and liquids in pipelines | |
| CN103364370A (en) | Annular core optical fiber sensor based on annular chamber decline | |
| CN107389144A (en) | A kind of downhole fluid flow-measuring method and flowmeter | |
| KR101299135B1 (en) | Reflective probe type apparatus for detecting gas and method for detecting gas using optical fiber with hollow core | |
| CA1144390A (en) | Apparatus for measuring fluid flow | |
| CN101832808A (en) | Taper chirped fiber grating liquid level sensor based on reflection spectrum bandwidth detection | |
| CN104677789A (en) | Nanoparticle counting detection device and method | |
| CN108828263B (en) | Optical fiber sensor for measuring microfluidic speed and direction based on TFBG | |
| CN112284565B (en) | Anti-resonance optical fiber temperature detector | |
| CN101701905B (en) | Wide-aperture long path sample pool | |
| CN102519907B (en) | Reflection type refractive index sensor based on optical fibre and micro-fluidic chip | |
| JPS5853739A (en) | Optical fiber type impurity detector | |
| CN204439500U (en) | A kind of liquid particles counting and detecting device | |
| CN104267000A (en) | Plastic optical fiber refractive index sensor on basis of micropore structure and preparation method and application thereof | |
| EP0130337A2 (en) | Optical measurement apparatus | |
| RU2429453C2 (en) | Fibre optic signaliser of fluid level and type | |
| CN208654184U (en) | A kind of fibre optical sensor measuring micro-fluidic speed and direction based on TFBG | |
| JP2006300565A (en) | Flow rate measuring element and micro flow passage device | |
| CN112327000A (en) | Flow velocity detection device based on optical fiber deformation | |
| JP2013152103A (en) | Optical liquid leakage detection apparatus and method | |
| CN115575353B (en) | Optical fiber refractive index sensor based on whispering gallery mode and measuring method | |
| CN204514758U (en) | A kind of nano particle counting and detecting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210212 |