CN114324212A - Fluid detection device and method - Google Patents
Fluid detection device and method Download PDFInfo
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- CN114324212A CN114324212A CN202111660013.8A CN202111660013A CN114324212A CN 114324212 A CN114324212 A CN 114324212A CN 202111660013 A CN202111660013 A CN 202111660013A CN 114324212 A CN114324212 A CN 114324212A
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Abstract
The invention provides a fluid detection device and a method, wherein the fluid detection device comprises a light source and a detector, wherein the light source is used for emitting measurement light; the dual-core optical fiber comprises a first core and a second core; the coupling module is used for coupling the measuring light into a first fiber core in the double-core optical fiber and coupling emergent light of a second fiber core into a transmission optical fiber, and the emergent light of the transmission optical fiber is received by the detector; the flexible reflecting component is fixed at the bottom end of the double-core optical fiber and is positioned at the lower side of the double-core optical fiber, and a fluid to be measured is allowed to enter between the reflecting surface of the reflecting component and the lower end surface of the double-core optical fiber; the double-core optical fiber is fixed on the fixing piece; a flexible member disposed at a lower side of the reflecting member; the driving component is used for driving the flexible component to move upwards. The invention has the advantages of high detection precision, adjustable sensitivity and the like.
Description
Technical Field
The invention relates to fluid detection, in particular to a fluid detection device and method based on optical fiber sensing technology.
Background
The detection of the concentration of the solution has important significance in a plurality of fields such as chemical production, medicine, ecology and the like. Although the titration method has been used for a long time, the development of a miniature novel optical fiber sensor is still a very important research topic. In recent years, with the development of femtosecond laser, an emerging processing technology and an optical fiber communication technology, an optical fiber sensor is well developed and applied.
In the production application and the life of present day, most optical sensors adopt single-core optical fiber, namely a cladding, a fibre core, and the application report to single-core optical fiber is more at present, though single-core optical fiber can two-way transmission, there is the signal crosstalk problem for sensor precision is not high, has restricted the rise space of optical fiber sensor performance in the application, contains two fibre cores in the double-core optical fiber cladding, and the precision of sensor has been improved greatly in the use of double-core optical fiber. In addition, most of the research of the existing optical fiber sensor is a fixed structure with a single size, the measurement range and sensitivity of the fixed structure cannot be adjusted, the actual environment is not the measurement of the concentration of a specific substance, the design of the fixed cavity length cannot meet the requirement of maintaining high-sensitivity response when the multiple wavelengths of a broadband light source are switched, and the application range of the optical fiber sensor is limited by the existing design.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a fluid detection device.
The purpose of the invention is realized by the following technical scheme:
a fluid detection device comprising a light source for emitting measurement light and a detector; the fluid detection device further comprises:
a dual-core optical fiber including a first core and a second core;
the coupling module is used for coupling the measuring light into a first fiber core in the double-core optical fiber and coupling emergent light of a second fiber core into a transmission optical fiber, and the emergent light of the transmission optical fiber is received by the detector;
the reflecting component is provided with flexibility and is fixed on the lower side of the double-core optical fiber, and the fluid to be measured is allowed to enter between the reflecting surface of the reflecting component and the lower end surface of the double-core optical fiber;
the fixing piece is fixed on the double-core optical fiber;
a flexible member disposed at a lower side of the reflection member;
a driving member for driving the flexible member to move upward.
The invention also aims to provide a fluid detection method, and the aim of the invention is realized by the following technical scheme:
a fluid detection method of a fluid detection apparatus according to the present invention includes:
the fluid to be measured is filled between the double-core optical fiber and the reflecting surface;
the measuring light sequentially penetrates through the first fiber core and the fluid to be measured and is reflected by the reflecting surface, and the reflected light sequentially penetrates through the fluid to be measured, the second fiber core and the transmission optical fiber and is received by the detector;
the analysis unit analyzes the output signal of the detector by using an absorption spectrum technology, so as to obtain the information of the fluid to be measured.
Compared with the prior art, the invention has the beneficial effects that:
1. the detection precision is high;
the double-core optical fiber end surface laser writing technology is adopted, so that the signal crosstalk is reduced, and the detection precision is improved;
2. the sensitivity is adjustable;
for different measuring light wavelengths, the distance between the bottom end face of the double-core optical fiber and the reflecting face is adjusted by the driving piece, so that the output light cavity of the second fiber core is the largest, and the sensitivity of the detection device is adjustable;
3. the service life is long;
and a coupling module and an optical fiber protection shell (fixing piece) are added, so that the detection device is more convenient to use and more durable.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 is a schematic flow diagram of a fluid detection method according to an embodiment of the invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of explaining the technical solution of the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
the fluid detection device of the embodiment of the invention comprises:
a light source and a detector, the light source for emitting measurement light;
a dual-core optical fiber including a first core and a second core;
the coupling module is used for coupling the measuring light into a first fiber core in the double-core optical fiber and coupling emergent light of a second fiber core into a transmission optical fiber, and the emergent light of the transmission optical fiber is received by the detector;
the reflecting component is provided with flexibility and is fixed on the lower side of the double-core optical fiber, and the fluid to be measured is allowed to enter between the reflecting surface of the reflecting component and the lower end surface of the double-core optical fiber;
the fixing piece is fixed on the double-core optical fiber and surrounds the double-core optical fiber and bears the double-core optical fiber;
the flexible component is arranged on the lower side of the reflecting component, so that deformation is generated under the driving of external force, such as the distance between the bottom end face of the double-core optical fiber and the reflecting surface is reduced, and the optical wavelength is matched with the wavelength of the measuring light;
a driving member for driving the flexible member to move upward.
In order to improve the detection precision, the lower side of the double-core optical fiber is further provided with a groove processed by a laser writing technology.
In order to adapt to different objects to be measured, further, the light source is a tunable wavelength light source.
As shown in fig. 1, the fluid detection method according to the embodiment of the present invention, that is, the working method of the fluid detection apparatus according to the embodiment of the present invention, includes:
the fluid to be measured is filled between the double-core optical fiber and the reflecting surface;
the measuring light sequentially penetrates through the first fiber core and the fluid to be measured and is reflected by the reflecting surface, and the reflected light sequentially penetrates through the fluid to be measured, the second fiber core and the transmission optical fiber and is received by the detector;
the analysis unit analyzes the output signal of the detector by using an absorption spectrum technology, so as to obtain the information of the fluid to be measured.
In order to improve the detection sensitivity, further, the driving member drives the flexible member to move upwards, thereby pushing the upper side of the reflecting member, so that the distance between the bottom end face of the dual-core optical fiber and the reflecting surface is increasedLSatisfies the following conditions:
Example 2:
an application example of the fluid detection device and method according to embodiment 1 of the present invention to liquid detection.
In the present application example, the diameters of the first core and the second core in the dual core optical fiber are 8 μm, respectively, the pitch is 10 μm, and the outer diameter of the cladding is 125 μm; cutting two ends of the double-core optical fiber to enable the end face to be flat, and cleaning the end face by using an ultrasonic cleaner; the femtosecond laser is used for writing grooves at the lower end of the double-core optical fiber, the length of the grooves is 40 mu m, the width of the grooves is 40 mu m, and the depth of the grooves is 25 mu m; a layer of polypropylene film (reflection component) plated with a metal film is bonded on the lower end face of the double-core optical fiber, and the thickness of the film is 4 mu m; the coupling module comprises two optical waveguides, the diameter of each optical waveguide is 8 micrometers, the distance between the upper ends of the optical waveguides is 2 micrometers, and the lower ends of the optical waveguides are coupled with the double-core optical fibers;
the fixing piece bears the bottom end of the double-core optical fiber and surrounds the double-core optical fiber to play a role in protection; the fixing piece is provided with a through hole, so that the fluid to be measured enters between the double-core optical fiber and the reflecting surface through the through hole; the flexible component adopts a plastic sheet and is arranged on the lower side of the film; the driving piece adopts the screw, fixes at the mounting, is located the downside of flexible component, and when the driving piece was rotatory, the plastic sheet was pushed against to the distance between adjustment multicore optic fibre bottom end face and the plane of reflection.
As shown in fig. 1, the fluid detection method according to the embodiment of the present invention, that is, the working method of the fluid detection apparatus according to the embodiment of the present invention, includes:
the bottom end of the fluid detection device is immersed in the liquid to be detected,
the liquid to be measured penetrates through the through hole of the fixing piece and enters and fills the space between the bottom end face of the double-core optical fiber and the reflecting face;
measuring light emitted by the light source sequentially penetrates through the first fiber core and the liquid to be measured and is reflected by the reflecting surface, and the reflected light sequentially penetrates through the liquid to be measured, the second fiber core and the transmission optical fiber and is received by the detector;
the driving member drives the flexible member to move upwards to push the upper side of the reflecting member, so that the distance between the bottom end face of the dual-core optical fiber and the reflecting surface is keptLSatisfies the following conditions:
the analysis unit analyzes the output signal of the detector by using an absorption spectrum technology, thereby obtaining information of the liquid to be measured.
Claims (10)
1. A fluid detection device comprising a light source for emitting measurement light and a detector; characterized in that, the fluid detection device still includes:
a dual-core optical fiber including a first core and a second core;
the coupling module is used for coupling the measuring light into a first fiber core in the double-core optical fiber and coupling emergent light of a second fiber core into a transmission optical fiber, and the emergent light of the transmission optical fiber is received by the detector;
the reflecting component is provided with flexibility and is fixed on the lower side of the double-core optical fiber, and the fluid to be measured is allowed to enter between the reflecting surface of the reflecting component and the lower end surface of the double-core optical fiber;
the fixing piece is fixed on the double-core optical fiber;
a flexible member disposed at a lower side of the reflection member;
a driving member for driving the flexible member to move upward.
2. The fluid detection device according to claim 1, wherein the reflective member is a thin film having a metal reflective film on an upper side thereof.
3. The fluid testing device of claim 1, wherein said flexible member is a plastic sheet.
4. The fluid testing device of claim 1, wherein said fixture surrounds said two-core fiber and has a through hole for allowing a fluid to be tested to pass therethrough.
5. The fluid testing device of claim 1, wherein said drive member comprises a screw.
6. The fluid testing device of claim 1, wherein the underside of said dual core fiber has grooves machined by laser writing.
7. The fluid testing device of claim 1, wherein the light source is a tunable wavelength light source.
8. The fluid detection method of the fluid detection apparatus according to any one of claims 1 to 7, the fluid detection method being:
the fluid to be measured is filled between the double-core optical fiber and the reflecting surface;
the measuring light sequentially penetrates through the first fiber core and the fluid to be measured and is reflected by the reflecting surface, and the reflected light sequentially penetrates through the fluid to be measured, the second fiber core and the transmission optical fiber and is received by the detector;
the analysis unit analyzes the output signal of the detector by using an absorption spectrum technology, so as to obtain the information of the fluid to be measured.
9. The fluid detection method of claim 8, wherein the driving member drives the flexible member to move upwards, so as to push the reflective member to move upwards, such that the distance L between the bottom end surface of the dual-core optical fiber and the reflective surface satisfies:
10. The fluid testing method of claim 8, wherein said reflective surface is adhered to a film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111660013.8A CN114324212A (en) | 2021-12-30 | 2021-12-30 | Fluid detection device and method |
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| CN202111660013.8A CN114324212A (en) | 2021-12-30 | 2021-12-30 | Fluid detection device and method |
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| CN102042961A (en) * | 2009-10-20 | 2011-05-04 | 博奥生物有限公司 | Fiber reflecting type micro-nano system spectrophotometer and application thereof |
| CN102539012A (en) * | 2011-12-26 | 2012-07-04 | 中国科学院西安光学精密机械研究所 | Optical fiber Fabry-Perot temperature sensor for measuring temperature of micro area and measuring method thereof |
| US20150323312A1 (en) * | 2014-05-06 | 2015-11-12 | Oz Optics Ltd. | Method and system for simultaneous measurement of strain and temperature utilizing dual core fiber |
| CN108988116A (en) * | 2018-07-31 | 2018-12-11 | 北京交通大学 | A kind of saturable absorbing mirror based on high non-linearity twin-core fiber |
| CN209117717U (en) * | 2018-09-10 | 2019-07-16 | 曲阜师范大学 | Flow velocity of optical measuring instrument based on principle of interference |
| CN210427778U (en) * | 2019-05-22 | 2020-04-28 | 中国计量大学 | Double-core optical fiber magnetic field sensing probe |
| CN111458669A (en) * | 2020-06-08 | 2020-07-28 | 中国计量大学 | Optical fiber magnetic field and temperature sensing probe based on double F-P structure |
| CN112703391A (en) * | 2018-09-28 | 2021-04-23 | 株式会社富士金 | Concentration measuring method |
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2021
- 2021-12-30 CN CN202111660013.8A patent/CN114324212A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024826A (en) * | 2005-07-21 | 2007-02-01 | Fujikura Ltd | Optical detection sensor |
| CN102042961A (en) * | 2009-10-20 | 2011-05-04 | 博奥生物有限公司 | Fiber reflecting type micro-nano system spectrophotometer and application thereof |
| CN102539012A (en) * | 2011-12-26 | 2012-07-04 | 中国科学院西安光学精密机械研究所 | Optical fiber Fabry-Perot temperature sensor for measuring temperature of micro area and measuring method thereof |
| US20150323312A1 (en) * | 2014-05-06 | 2015-11-12 | Oz Optics Ltd. | Method and system for simultaneous measurement of strain and temperature utilizing dual core fiber |
| CN108988116A (en) * | 2018-07-31 | 2018-12-11 | 北京交通大学 | A kind of saturable absorbing mirror based on high non-linearity twin-core fiber |
| CN209117717U (en) * | 2018-09-10 | 2019-07-16 | 曲阜师范大学 | Flow velocity of optical measuring instrument based on principle of interference |
| CN112703391A (en) * | 2018-09-28 | 2021-04-23 | 株式会社富士金 | Concentration measuring method |
| CN210427778U (en) * | 2019-05-22 | 2020-04-28 | 中国计量大学 | Double-core optical fiber magnetic field sensing probe |
| CN111458669A (en) * | 2020-06-08 | 2020-07-28 | 中国计量大学 | Optical fiber magnetic field and temperature sensing probe based on double F-P structure |
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