CN110906988A - Double-parameter optical fiber sensing detection device with double micro-fluid channels - Google Patents
Double-parameter optical fiber sensing detection device with double micro-fluid channels Download PDFInfo
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- CN110906988A CN110906988A CN201911362734.3A CN201911362734A CN110906988A CN 110906988 A CN110906988 A CN 110906988A CN 201911362734 A CN201911362734 A CN 201911362734A CN 110906988 A CN110906988 A CN 110906988A
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention is suitable for the technical field of optical fiber sensing, and provides a double-parameter optical fiber sensing detection device with double microfluidic channels, which comprises a broadband light source, a wavelength division multiplexer, a double-parameter sensing head, a coupler and a spectrum analyzer; the temperature sensing optical fiber is arranged in the microfluid 1 channel, the refractive index sensing optical fiber is arranged in the microfluid 2 channel, the microfluid 1 channel and the microfluid 2 channel are connected through two spiral cylindrical through port structures, the upper left of the microfluid 1 channel is provided with a fluid inlet, the lower right of the microfluid 2 channel is provided with a fluid outlet, when the refractive index and the temperature are detected, liquid to be detected is injected into the fluid inlet, flows out of the fluid outlet after passing through the microfluid 1 channel and the microfluid 2 channel, and is connected with the fluid inlet and the fluid outlet through a plastic sleeve for a small peristaltic pump, so that the liquid to be detected can circularly flow in the channels at a constant speed, and the incident light source connector and the signal receiving; the broadband light source is connected with the incident light source joint, and the spectrum analyzer is connected with the signal receiving joint.
Description
Technical Field
The invention relates to the field of optical fiber sensing and biochemical medicine, in particular to a double-parameter optical fiber sensing detection device with double micro-fluid channels, which can be used for measuring refractive index and temperature.
Background
The optical fiber sensing technology is a new technology formed along with the development of optical fiber and optical fiber communication technology. Because the optical fiber sensor has the advantages of strong anti-electromagnetic interference capability, high sensitivity, compact structure, corrosion resistance and the like, the optical fiber sensor is widely applied to the fields of aerospace, biomedicine, environmental monitoring, chemical industry and the like. In recent years, with the popularization of optical fiber sensing and the increasing demand of people, optical fiber sensors of temperature, refractive index, curvature, humidity sensor and other types have been applied to actual production life.
The refractive index and the temperature are two essential important parameters in biomedicine and industrial production, and the real-time accurate simultaneous measurement of the refractive index and the temperature has important significance in the field of optical fiber sensing. The optical fiber sensors sense the change of the external environment by sensing heads to obtain required parameter information, and the sensing heads of the sensors are sensitive and fragile and are easy to be interfered by the outside, so that the sensing and measuring effect is poor. Therefore, the manufacture and the encapsulation of the sensing head are particularly important, the well encapsulated sensing head can effectively avoid external interference, protect the sensing structure from being damaged, and ensure the stability of measurement, thereby greatly increasing the practicability of the sensor.
Disclosure of Invention
The invention aims to provide a double-parameter optical fiber sensing detection device with double micro-fluid channels, which realizes the simultaneous measurement of the refractive index and the temperature of an external substance by monitoring the change of the wavelength in an output transmission spectrum.
The invention is realized in this way, a double-parameter optical fiber sensing detection device with double microfluidic channels, which comprises a broadband light source, a wavelength division multiplexer, a double-parameter sensing head, a coupler and a spectrum analyzer; the temperature sensing optical fiber is arranged in the microfluid 1 channel, the refractive index sensing optical fiber is arranged in the microfluid 2 channel, the upper left of the microfluid 1 channel is a fluid inlet, the lower right of the microfluid 2 channel is a fluid outlet, when detecting the refractive index and the temperature, the liquid to be detected is injected into the fluid inlet, flows out from the fluid outlet after passing through the microfluid 1 channel and the microfluid 2 channel, and is connected with the fluid inlet and the fluid outlet through a plastic sleeve for a small peristaltic pump, so that the liquid to be detected can circularly flow in the channel at a constant speed, and the incident light source connector and the signal receiving connector are respectively connected with the optical fiber of.
Two ends of the sensing optical fiber are straightened in the micro-fluid channel and penetrate through the micropores of the cylindrical plug, the glue filling hole sealing prevents liquid from leaking laterally, and the sensing optical fiber at the other end of the cylindrical plug is respectively welded with an optical fiber jumper.
The channels of the sensing optical fiber parts in the microfluid 1 channel and the microfluid 2 channel are arranged into a square structure, and the channels at two sides connected with the channels are arranged into a cylindrical structure.
The microfluid 1 channel and the microfluid 2 channel are connected through two spiral cylindrical through hole structures, and the spiral cylindrical through hole is designed to be used for buffering the extrusion of the flowing of liquid to the optical fiber.
The fluid inlet and the fluid outlet are connected by a small peristaltic pump, so that the liquid to be measured circularly flows in the microfluidic channel at a constant speed.
The incident light source joint is an optical fiber jumper wire and is coupled with the broadband light source through a wavelength division multiplexer.
The signal receiving connector is an optical fiber jumper wire and is connected with the spectrum analyzer through a coupler.
The invention has the following beneficial effects:
firstly, the temperature-sensitive effect of the interference structure of the Sagnac ring based on the panda type polarization maintaining optical fiber is used as a temperature sensing mechanism, the transmission spectrum generated by the self-imaging effect of the multimode interference structure consisting of the single-mode, coreless and single-mode optical fiber is used for obtaining the refractive index sensing characteristic, and the high-sensitivity double-parameter sensing of the refractive index and the temperature of the liquid to be measured is realized.
Secondly, the invention adopts the upper and lower microfluid double-channel structure design to realize the double-parameter simultaneous measurement, and has the advantages of small device volume, excellent sealing performance, good stability of transmission signals and high sensitivity.
Thirdly, the invention adopts the design of the circulation flow detection of the liquid to be detected at the fluid inlet and the fluid outlet, thereby greatly reducing the sample consumption and saving the cost.
Drawings
Fig. 1 is a schematic structural diagram of a dual-parameter optical fiber sensor head with dual microfluidic channels according to the present invention.
FIG. 2 is a diagram of a dual-parameter fiber sensing system according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1-incident light source connector; 2-optical fiber groove; 3-a cylindrical plug; 4-a fluid inlet; 5-microfluidic 1 channel; 6-microfluidic 2-channel; 7-square structured microfluidic channels; 8-a spiral cylindrical through opening; 9-temperature sensing optical fiber; 10-refractive index sensing fiber; 11-a fluid outlet; 12-a signal receiving connector; 13-a broadband light source; 14-a wavelength division multiplexer; 15-optical fiber sensing head; 16-a small peristaltic pump; 17-plastic sleeve; 18-a coupler; 19-spectrum analyzer.
Detailed Description
The invention relates to a double-parameter optical fiber sensing detection device with double microfluidic channels, which comprises a broadband light source 13, a wavelength division multiplexer 14, a double-parameter optical fiber sensing head 15, a coupler 18 and a spectrum analyzer 19; the temperature sensing optical fiber 9 is arranged in the microfluid 1 channel 5, the refractive index sensing optical fiber is arranged in the microfluid 2 channel 6, the upper left of the microfluid 1 channel is provided with a fluid inlet 4, the lower right of the microfluid 2 channel is provided with a fluid outlet 11, and the microfluid 1 channel 5 and the microfluid 2 channel 6 are connected through two spiral cylindrical through holes 8; two ends of the sensing optical fiber are straightened in the micro-fluid channel and penetrate through the micropores of the cylindrical plug 3, the sensing optical fiber is sealed by glue filling to prevent liquid from leaking laterally, and the sensing optical fiber at the other end of the cylindrical plug 3 is respectively welded with an optical fiber jumper wire to form an incident light source connector 1 and a signal receiving connector 12. When the refractive index and temperature detection is carried out, liquid to be detected is injected into the fluid inlet 4, flows out of the fluid outlet 11 after passing through the microfluid 1 channel 5 and the microfluid 2 channel 6, and is connected with the fluid inlet 4 and the fluid outlet 11 through the small peristaltic pump 16 by using two plastic sleeves 17, so that the liquid to be detected can circularly flow in the channels at a constant speed, the incident light source connector 1 is coupled with the broadband light source 13 through the wavelength division multiplexer 14, the signal receiving connector 12 is connected with the spectrum analyzer 19 through the coupler 18, and then the refractive index and the temperature are simultaneously measured by monitoring the change rule of the wavelength of the output spectrum.
The structure of the temperature sensing optical fiber 9 is composed of a sagnac interference structure based on a polarization maintaining optical fiber, the structure of the refractive index sensing optical fiber 10 is composed of a multimode interference structure based on a single mode-coreless-single mode optical fiber, the polarization maintaining optical fiber in the sensing optical fiber structure adopts a panda type polarization maintaining optical fiber, the diameter of a coreless optical fiber core is 125 micrometers, and the adopted length is 5.9 cm.
The microfluid double-channel structure, optical fiber groove 2 and cylindricality stopper 3 adopt 3D printing technique to combine photosensitive resin material to obtain the structure mould for the encapsulation of sensing head is fixed and the detection of the liquid that awaits measuring.
Two ends of the sensing optical fiber are straightened in the micro-fluid channel and penetrate through the micropores of the cylindrical plug 3, the glue filling hole sealing is adopted to prevent liquid from leaking laterally, and the sensing optical fiber at the other end of the cylindrical plug 3 is respectively welded with an optical fiber jumper wire to form an incident light source connector 1 and a signal receiving connector 12.
The channel where the sensing optical fiber part is located in the microfluidic 1 channel and the microfluidic 2 channel is provided with a square structure channel 7, and the channels at two sides connected with the square structure channel are provided with cylindrical structures.
The microfluid 1 channel is structurally connected with the microfluid 2 channel through two spiral cylindrical through holes 8, and the spiral cylindrical through holes 8 are designed to be used for buffering the extrusion of liquid flow to the sensing optical fiber.
The fluid inlet 4 is connected with the fluid outlet 11 through a small peristaltic pump, so that the circulating flow during liquid detection is realized, the sample amount can be effectively reduced, and the stability of a system device and a measuring result is also ensured.
The incident light source joint 1 of the optical fiber sensing head 15 structure is coupled with the broadband light source 13 through a wavelength division multiplexer, and the signal receiving joint 12 is connected with the optical spectrum analyzer 19 through a coupler, so that double-parameter measurement of the refractive index and the temperature is realized. The optical fiber sensing head 15 can also be fused in the inner cavity of the laser, and the detection precision of the refractive index and the temperature change is improved by adopting the modes of laser wavelength demodulation and intensity demodulation.
Claims (4)
1. A double-parameter optical fiber sensing detection device with double micro-fluid channels is characterized by comprising sensing heads made of two optical fiber sensing structures, a micro-fluid 1 channel, a micro-fluid 2 channel and a fluid outlet, wherein two ports are arranged between the micro-fluid 1 channel and the micro-fluid 2 channel for mutual connection, an optical fiber groove and a cylindrical plug; the incident light source joint and the signal receiving joint are respectively connected with single-mode transmission optical fibers on two sides of the sensing optical fiber, the broadband light source is connected with the incident light source joint, and the spectrum analyzer is connected with the signal receiving joint.
2. The dual-parameter optical fiber sensing detection device with dual microfluidic channels as claimed in claim 1, wherein the channels of the sensing optical fiber portions in the microfluidic 1 channel and the microfluidic 2 channel are arranged in a square structure, and the channels connected to the channels are arranged in a cylindrical structure.
3. The dual-parameter optical fiber sensing and detecting device with dual micro fluid channels as claimed in claim 1, wherein the optical fiber groove is designed as a long cylindrical structure, a micro round hole is opened at the connection part of the optical fiber groove and the micro fluid channel, the cylindrical plug is also opened with a micro round hole of the same size, the single-mode transmission optical fiber at both sides of the sensing optical fiber can penetrate through the hole, and a fixed seal is glued at the outer side of the micro hole of the cylindrical plug.
4. The dual-parameter optical fiber sensing and detecting device with dual microfluidic channels as claimed in claim 1, wherein two ports are provided between the microfluidic 1 channel and the microfluidic 2 channel for connecting with each other, and the ports are designed as a spiral cylindrical structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911362734.3A CN110906988A (en) | 2019-12-25 | 2019-12-25 | Double-parameter optical fiber sensing detection device with double micro-fluid channels |
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| CN201911362734.3A CN110906988A (en) | 2019-12-25 | 2019-12-25 | Double-parameter optical fiber sensing detection device with double micro-fluid channels |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112547440A (en) * | 2020-11-30 | 2021-03-26 | 华中科技大学鄂州工业技术研究院 | Glue filling clamp for wire passing bolt |
| CN113866127A (en) * | 2021-10-26 | 2021-12-31 | 天津工业大学 | Micro-fluidic sensing device in fibre based on four-hole microstructure optical fiber integration |
-
2019
- 2019-12-25 CN CN201911362734.3A patent/CN110906988A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112547440A (en) * | 2020-11-30 | 2021-03-26 | 华中科技大学鄂州工业技术研究院 | Glue filling clamp for wire passing bolt |
| CN113866127A (en) * | 2021-10-26 | 2021-12-31 | 天津工业大学 | Micro-fluidic sensing device in fibre based on four-hole microstructure optical fiber integration |
| CN113866127B (en) * | 2021-10-26 | 2024-01-16 | 天津工业大学 | Intra-fiber micro-fluidic sensing device based on four-hole microstructure optical fiber integration |
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