CN202024962U - High-sensitive photonic crystal fiber refractive index sensor based on polarized light detection - Google Patents
High-sensitive photonic crystal fiber refractive index sensor based on polarized light detection Download PDFInfo
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- CN202024962U CN202024962U CN2011200212952U CN201120021295U CN202024962U CN 202024962 U CN202024962 U CN 202024962U CN 2011200212952 U CN2011200212952 U CN 2011200212952U CN 201120021295 U CN201120021295 U CN 201120021295U CN 202024962 U CN202024962 U CN 202024962U
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Abstract
The utility model provides a high-sensitive photonic crystal fiber refractive index sensor based on polarized light detection, which comprises a single wavelength light source, a polarizer, two fiber collimators, a V-shaped slot, a photonic crystal fiber probe and a light power meter, wherein the single wavelength light source is connected with one end of the polarizer, the other end of the polarizer is connected with one fiber collimator, the other fiber collimator is connected with the light power meter, the V-shaped slot is arranged between the two fiber collimators, the photonic crystal fiber probe is arranged in the V-shaped slot, the photonic crystal fiber probe is formed in a way that one side of a photonic crystal fiber is welded with a common single mode fiber, and the common fiber end surface is machined by a femtosecond laser to form a V-shaped area which is used for liquid to be detected to be poured into the photonic crystal fiber, the size of the V-shaped area is one eighth to one sixth of the area of the common single mode fiber, the length of the photonic crystal fiber is 10mm, and the length of the common single mode fiber is 0.2mm. The sensor has the advantages of realizing trace amount detection, being extremely high in sensitivity and the like.
Description
Technical field
The utility model belongs to the index sensor field, relates to a kind of highly sensitive photon crystal optical fibre refractivity sensor that detects based on polarized light.
Background technology
In chemistry and biology sensor, index sensor occupies an important position.Other some parameters of refractive index and content of material, composition or concentration etc. become positively related relation, thereby can measure these associated arguments indirectly by measuring refractive index.Therefore to the measurement of liquid refractivity, be widely used at numerous key areas such as chemical industry, food analysis, unknown material evaluation, quality monitoring, contamination analysis and oil well monitor.At present, the method for measurement refractive index has Brewster horn cupping, Abbe refractometer, interferometric method, spectrophotometer, surface plasma to strengthen measuring methods such as emission spectrometry and light velocity measurement instrument.But in these methods, the measurement range that has is restricted, and the requirement that has is carried out complicated processing, instrument adjustment complexity to sample, and the environment for use that has requires harsh, poor reliability, the manufacturing technology complexity that has, cost height.
Fibre Optical Sensor has the advantage of many uniquenesses, and as anti-electromagnetic interference (EMI), volume is little, and is anticorrosive etc., can be applicable in the various environment.Index sensor based on optical fiber is varied, mainly contains the index sensor based on long period fiber grating (LPG) and Fiber Bragg Grating FBG (FBG) at present.Because its resonance wavelength is subject to extraneous refractive index influence, long period fiber grating has obtained extensive studies as index sensor.The coupling light of Fiber Bragg Grating FBG betides between the core mode, is measuring through also can be used for refractive index sensing after the uniform corrosion.
Based on the index sensor refractive index of long period fiber grating and Fiber Bragg Grating FBG is that near 1.333 aqueous solution sensitivity to be measured is generally not high, can't satisfy the needs that the aqueous solution refractive index that contains micro-example detects.And existing index sensor technology all needs a certain amount of solution to be measured, and detection optical fiber is immersed in the solution to be measured, is difficult to realize detecting when the sample solution amount is few.
Summary of the invention
The purpose of this utility model is exactly low and can't realize shortcoming such as trace detection to the aqueous assay sensitivity that contains micro-example in order to overcome existing index sensor, proposes a kind of highly sensitive photon crystal optical fibre refractivity sensor based on the polarized light detection.
Technical solution of the present utility model is as follows:
A kind of highly sensitive photon crystal optical fibre refractivity sensor that detects based on polarized light comprises single wavelength light source, the polarizer, two optical fiber collimators, V-type groove, photonic crystal fiber detecting head and light power meters; Single wavelength light source is connected with the polarizer one end, and the polarizer other end is connected with optical fiber collimator, and another optical fiber collimator is connected with light power meter, and the V-type groove is positioned in the middle of two optical fiber collimators, and the photonic crystal fiber detecting head places in the V-type groove.
The photonic crystal fiber detecting head is made of behind the welding general single mode fiber on one side photonic crystal fiber, and the ordinary optic fibre end face is processed to form a V-type zone through femto-second laser and is used for testing liquid and pours into photonic crystal fiber, the size in V-type zone be the general single mode fiber area 1/8th to sixth, wherein the length of photonic crystal fiber is 10mm, and the length of general single mode fiber is 0.2mm.
The advantage that the utility model had is: a kind of highly sensitive photon crystal optical fibre refractivity sensor that detects based on polarized light is that the photonic crystal fiber of 10.2mm is a detecting head with length, and whole detecting head volume is little, simple in structure; Only needing during use that photonic crystal fiber is surveyed first melt has an end of single-mode fiber to dip in the testing liquid of getting minute quantity, can satisfy the detection needs, realizes trace detection; This index sensor has very high sensitivity simultaneously, is specially adapted to contain the refractive index detection of micro-example aqueous solution.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the structural representation of photonic crystal fiber detecting head.
Fig. 3 is the cross sectional representation of photonic crystal fiber.
Fig. 4 is that photonic crystal fiber is surveyed the cross sectional representation that first melt has single-mode fiber one end.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 1, a kind of highly sensitive photon crystal optical fibre refractivity sensor that detects based on polarized light comprises single wavelength light source 1, the polarizer 2, two optical fiber collimators 3, V-type groove 4, photonic crystal fiber detecting head 5 and light power meters 6; It is characterized in that, single wavelength light source 1 is connected with the polarizer 2 one ends, and the polarizer 2 other ends are connected with optical fiber collimator 3, and another optical fiber collimator 3 is connected with light power meter 6, V-type groove 4 is positioned in the middle of two optical fiber collimators 3, and photonic crystal fiber detecting head 5 places in the V-type groove 4.
Shown in Fig. 2,3 and 4, photonic crystal fiber detecting head 5 constitutes after by photonic crystal fiber 8 welding on one side general single mode fibers 7, and ordinary optic fibre 7 end faces are processed to form a V-type zone 9 through femto-second laser and are used for testing liquid and pour into photonic crystal fiber, the size in V-type zone 9 be the general single mode fiber area 1/8th to sixth, wherein the length 8 of photonic crystal fiber is 10mm, and the length of general single mode fiber 7 is 0.2mm.
The utility model is based on following principle:
Incident light source is a single wavelength light source that has DFB self-feedback ciucuit system, and DFB self-feedback ciucuit system can stabilized light source, eliminates the interference that the light source shake brings.The incident light wavelength is the optical wavelength that is positioned at photonic crystal fiber band gap edge.The polarizer is used to regulate the polarization of incident light attitude, makes the polarization of incident light attitude be adjusted into the Y polarization state.Two optical fiber collimators and V-type groove are in same surface level, by regulate optical fiber collimator make luminous energy smoothly the photonic crystal fiber detecting head in placing the V-type groove pass through.Detect output intensity by light power meter at last.
The photonic crystal fiber detecting head is made of behind the welding general single mode fiber on one side photonic crystal fiber, and the ordinary optic fibre end face is processed to form a V-type zone through femto-second laser.But the concrete list of references " Selective opening of air holes in photonic crystal fiber " of the femto-second laser process technology in V-type zone, Optics Letters, vol.35, no.23,3886-3888.Testing liquid is circulated into photonic crystal fiber by this V-type zone, has only the airport in the V-type zone to pour into liquid, realizes that photonic crystal fiber partly pours into.The photonic crystal fiber that part pours into liquid has a higher Polarization Dependent Loss.The Y polarized light that wavelength is positioned at photonic crystal fiber band gap edge is very responsive to pouring into liquid refractivity.When pouring into liquid refractivity when changing, obvious variation also can take place in the light intensity of Y polarized light.When using this photonic crystal fiber detecting head, only need to melt the photonic crystal fiber that single-mode fiber is arranged and survey first end and dip in and get testing liquid.Because the capillary force of photonic crystal fiber covering airport, testing liquid can be circulated in the photonic crystal fiber by the V-type zone, and the amount of pouring into can be controlled by speed of pouring into and the time of pouring into.Can realize refractive index sensing by the Y polarized light loss that detects through the photonic crystal fiber detecting head.
The photonic crystal fiber that we use in the present embodiment is the HC-1550-02 photon band gap type photonic crystal fiber of being produced by Crystal Fiber A/S.The light that with the wavelength is 1530nm is as the input light source, and the time that pours into testing liquid is 1s, and the photonic crystal fiber length that is poured into testing liquid is 1mm.Use full vector finite element analysis method, when we simulate the testing liquid that pours into different refractivity, the intensity loss of Y polarized light.When refractive index was 1.333 aqueous solution, the intensity loss of Y polarized light was 3.96dBm; When refractive index became 1.33395 after aqueous solution is mixed the denier sample, the intensity loss of Y polarized light was 7.30dBm.By above result as can be known, this sensor has good sensing effect to the refractive index trace variation of water sample solution, and the sensitivity of water sample solution refractive index reaches 3515.79dBm/RIU; When using resolution to monitor, can detect water sample solution 10 as the light power meter of 0.01dBm
-6The slight change of refractive index.
Claims (2)
1. a highly sensitive photon crystal optical fibre refractivity sensor that detects based on polarized light comprises single wavelength light source, the polarizer, two optical fiber collimators, V-type groove, photonic crystal fiber detecting head and light power meters; It is characterized in that single wavelength light source is connected with the polarizer one end, the polarizer other end is connected with optical fiber collimator, and another optical fiber collimator is connected with light power meter, and the V-type groove is positioned in the middle of two optical fiber collimators, and the photonic crystal fiber detecting head places in the V-type groove.
2. a kind of highly sensitive photon crystal optical fibre refractivity sensor that detects based on polarized light as claimed in claim 1, it is characterized in that, described photonic crystal fiber detecting head is made of behind the welding general single mode fiber on one side photonic crystal fiber, and the ordinary optic fibre end face is processed to form a V-type zone through femto-second laser and is used for testing liquid and pours into photonic crystal fiber, the size in V-type zone be the general single mode fiber area 1/8th to sixth, wherein the length of photonic crystal fiber is 10mm, and the length of general single mode fiber is 0.2mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200212952U CN202024962U (en) | 2011-01-21 | 2011-01-21 | High-sensitive photonic crystal fiber refractive index sensor based on polarized light detection |
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| CN2011200212952U CN202024962U (en) | 2011-01-21 | 2011-01-21 | High-sensitive photonic crystal fiber refractive index sensor based on polarized light detection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175645A (en) * | 2011-01-21 | 2011-09-07 | 中国计量学院 | Polarized light detection-based highly-sensitive photonic crystal fiber refractive index sensor |
| CN104280363A (en) * | 2014-10-20 | 2015-01-14 | 中国计量学院 | SPR (Surface Plasma Resonance) based reflective index sensor with high sensitivity and wide measurement range |
| CN104280363B (en) * | 2014-10-20 | 2017-01-04 | 中国计量学院 | The index sensor of high sensitivity Wide measuring range based on surface plasma body resonant vibration |
-
2011
- 2011-01-21 CN CN2011200212952U patent/CN202024962U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175645A (en) * | 2011-01-21 | 2011-09-07 | 中国计量学院 | Polarized light detection-based highly-sensitive photonic crystal fiber refractive index sensor |
| CN104280363A (en) * | 2014-10-20 | 2015-01-14 | 中国计量学院 | SPR (Surface Plasma Resonance) based reflective index sensor with high sensitivity and wide measurement range |
| CN104280363B (en) * | 2014-10-20 | 2017-01-04 | 中国计量学院 | The index sensor of high sensitivity Wide measuring range based on surface plasma body resonant vibration |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111102 Termination date: 20120121 |