CN102411003A - Sensing method of far-field optical fiber evanescent field - Google Patents
Sensing method of far-field optical fiber evanescent field Download PDFInfo
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- CN102411003A CN102411003A CN2011102092945A CN201110209294A CN102411003A CN 102411003 A CN102411003 A CN 102411003A CN 2011102092945 A CN2011102092945 A CN 2011102092945A CN 201110209294 A CN201110209294 A CN 201110209294A CN 102411003 A CN102411003 A CN 102411003A
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Abstract
The invention discloses a sensing method of a far-field optical fiber evanescent field. The method comprises the following steps: using micro-nano particles to modify measured object liquid, suspending the micro-nano particles around the sensitive section of a sensing optical fiber, and utilizing the micro-nano effect formed by the micro-nano particles under the excitation of the evanescent field to transfer energy of the evanescent field of a near field to a far field, thereby enhancing the detection range of an optical fiber evanescent field sensor, improving the comprehensiveness and the fidelity of detection results when the optical fiber evanescent field sensor is used for detecting a non-uniform medium and improving the sensitivity of the sensor.
Description
Technical field
The invention belongs to the optical fiber biochemical sensor technical field; Relate to the optical fiber biochemical sensor in fields such as being used for medical detection, environmental monitoring and biochemical anti-terrorism inspection, be specifically related to the detection method that a kind of evanescent field energy with the near field is induced to the far field fiber evanescent field biochemical sensor that detects in the far field.
Background technology
The fiber evanescent field sensor is the Fibre Optical Sensor of a kind of new function type of putting forward the eighties in last century; It utilizes sensor fibre evanescent field energy that excites and the measured matter that is in the energy scope to interact; Cause the absorption of transmission of power in the optical fiber; Reflect the specifying information of test substance through energy changing, wait like refractive index, concentration and realize the sensing effect.According to different working environments and measurement purpose far field and near field being divided, generally speaking, is the center with the field source, and the zone in three wavelength coverages is commonly referred near field, also can be described as induction field; Be the center with the field source, radius is that three spatial dimensions outside the wavelength are called the far zone field, also can be described as radiation field.
When light transmits with the form of total reflection in optical fiber; Can be at fiber core layer and covering produce an energy field that is penetrated in the fibre cladding at the interface; This field energy is decayed rapidly along with far being index apart from increasing of fiber core interface distance; Its penetration depth has only the size of a wavelength magnitude of incident light, is typical near-field energy.The energy far fieldization of the evanescent field near field can effectively be improved the reach of fiber evanescent field sensor and measured matter; Obtain measured matter more comprehensively information and the sensitivity that effectively improves sensor, therefore the evanescent field energy far fieldization near field is had important and practical meanings to the performance improvement of fiber evanescent field sensor with the development popularization.
Because the evanescent field energy can only interact at the near-field region and the test substance of several wavelength coverages, when some special test substance is detected, the incomplete situation of detection information can occur.The measured matter that is evenly distributed in the solvent for solute can obtain more comprehensively to detect information; But for solute test substance pockety in solvent; Like suspension, emulsion etc.,, cause the fiber evanescent field sensor can not reflect the full detail of test substance because the near field reach can not show solute information pockety fully; The Presence information distortion, it is bigger to detect error.According to document [in water conservancy, Shang Qinghai, Li Guibai, outstanding turbid particle optical detection is theoretical, HarBin Building University's journal, 2001,34 (1): 49-52] report, the suspension volume hour, like 0.1mm
3The average of numbers of particles is 104 in the sample; Standard deviation is 100; Numbers of particles in the continuous sample has on average ± 2% difference, and the numbers of particles relative changing value is bigger, can cause measuring error and information distortion significantly when detecting with the general optical fiber evanescent field sensor for such test substance.Simultaneously; In the fibre cladding zone of low-refraction, decay rapidly as the evanescent field energy near field, limited with the reach of test substance, and the evanescent field energy a little less than; Very for a short time being difficult to of the energy changing amount of optical fiber measures after the sensing, limited the raising of transducer sensitivity.
Summary of the invention
(1) goal of the invention
For solving the low problem of information distortion, detection sensitivity that the fiber evanescent field sensor exists in the background technology, the object of the invention provides the method for sensing of a kind of novel far field fiber evanescent field.
(2) technical scheme
For achieving the above object, the invention provides a kind of utilization and be suspended in the method for sensing of sensor fibre micro-nano particle all around the evanescent field far fieldization near field, the method for far field of the present invention fiber evanescent field sensing, the step of said method is following:
Step S1: the sensor fibre sensitive segment is hung within the reaction tank; Utilize the micro-nano particle to modify measured object liquid; Measured object liquid is fully mixed with the micro-nano particle, obtain micro-nano particle and the well-mixed suspension of measured object liquid, and the micro-nano particle suspension is distributed in the measured object liquid;
Step S2: the measured object liquid that will contain the micro-nano particle is poured in the groove in the reaction tank device, the micro-nano particle through the measured object liquid suspension around the sensor fibre sensitive segment, make fiber evanescent field sensor fibre around form micro-nano particle network array;
Step S3: the micro-nano effect of utilizing the micro-nano particle with the evanescent field energy delivery near field to the far field.
(3) beneficial effect
This far field provided by the invention fiber evanescent field method for sensing makes the reach of evanescent field energy and test substance near field reach the far-field range of 4 μ m, can be wider and more test substance reaction.Can carry out comprehensive reliable detection to the uneven fluid to be measured information of solute Distribution, solve the information distortion problem of traditional evanescent field method for sensing for the testing liquid detection of solute uneven distribution, and the sensitivity that has improved sensor.
Description of drawings
Fig. 1 a is the perspective view of reaction tank.
Fig. 1 b is the reaction tank structural front view.
Fig. 2 is the structural representation of the whole transducing part of invention.
Fig. 3 is the block diagram that the micro-nano particle is modified measured object liquid.
Fig. 4 a to Fig. 4 d is that the micro-nano particle is with evanescent field far field synoptic diagram.
Fig. 5 is the field energy distribution plan of metal micro-nano particle.
Fig. 6 is the field energy distribution plan of the medium micro-nano particle of high index of refraction.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to further explain of the present invention.
1. be the perspective view of reaction tank like Fig. 1 a, Fig. 1 b is the front view of reaction tank, and Fig. 1 a illustrates and comprises reaction tank 1, groove 2, half-cylindrical passage 3 and reaction tank support portion 4; The step of introducing the reaction tank making below is:
Process a groove 2 in rectangular-shaped dimethyl silicone polymer (PDMS) reaction tank support portion 4 and be used to hold measured object liquid, said groove 2 is half-cylindrical, sets a half-cylindrical passage 3 at the two ends of groove 2; The radius of groove 2 is 0.5mm-10cm, the smaller half-cylindrical passage 3 of processing radius at semi-cylindrical groove 2 two ends, and half-cylindrical passage 3 radiuses are 0.3mm-0.5cm, half-cylindrical passage 3 is used to place sensor fibre 5.
Fig. 2 is the structural representation of the whole transducing part of the present invention, contains the sensor fibre 5 of covering shown in Fig. 2, removes the sensor fibre sensitive segment 6 of covering; Introducing fixedly below, the step of sensor fibre 5 is:
Choose the sensor fibre 5 of a segment length at 40cm-80cm; One section 10cm-30cm is wherein removed covering as sensor fibre sensitive segment 6; Sensor fibre sensitive segment 6 is hung on the reaction tank 1; The two ends of sensor fibre 5 are placed less semi-cylindrical passage 3 zones of radius, again that sensor fibre 5 and reaction tank support portion 4 usefulness bonding agents are bonding good, detecting means such as Fig. 2 of formation integrative-structure.
2. like Fig. 3 the step that the micro-nano particle is modified measured object liquid is shown, liquid of measured object shown in it 7 and micro-nano particle 8; Sensor fibre sensitive segment 6 is hung within the reaction tank 1; The step of utilizing micro-nano particle 8 to modify measured object liquid 7 is: the micro-nano particle of making 8 is put into the beaker that fills measured object liquid 7; Stir, micro-nano particle 8 is fully mixed with measured object liquid 7, chemical reaction does not take place with micro-nano particle 8 in measured object liquid 7; Obtain micro-nano particle 8 and measured object liquid 7 well-mixed suspensions, and 8 suspensions of micro-nano particle are distributed in the measured object liquid 7.
3. the measured object liquid 7 that contains micro-nano particle 8 that will obtain is poured in the semi-cylindrical groove 2 in the reaction tank 1; Micro-nano particle 8 is suspended in around the sensor fibre sensitive segment 6 through measured object liquid 7, make fiber evanescent field sensor fibre around form micro-nano particle network array; Shown in Fig. 4 a to Fig. 4 d of the signal of micro-nano particle with the evanescent field far fieldization; Fig. 4 a, Fig. 4 b are the synoptic diagram of two kinds of micro-nano particle suspensions at sensor fibre sensitive segment 6; Micro-nano particle 8 shown in Fig. 4 a, Fig. 4 b is divided into metal micro-nano particle 9 and medium micro-nano particle 10, and metal micro-nano particle 9 is controlled at 0.01 λ-100 λ with the characteristic dimension of medium micro-nano particle 10, and λ is the long wavelength of incident light source; The refractive index of medium micro-nano particle 10 is 0.8n-3n, and n is the fiber core refractive index.Fig. 4 c is a high refractive index medium KPT Scatter field energy distribution schematic diagram, and Fig. 4 d is a single elliptical metal micro-nano Particle Field excitation dipole oscillating field energy distribution synoptic diagram down.
Principle of work of the present invention is: of the present inventionly to the effect that modify through 8 pairs of testing liquids 7 of micro-nano particle, utilizing suspends is distributed in the micro-nano particle 8 around the sensor fibre sensitive segment 6, near-field energy is passed to the far field carries out sensing.Micro-nano particle 8 can be divided into metal micro-nano particle 9 and 10 two kinds of modes of action of medium micro-nano particle with the micro-nano effect of near-field energy far fieldization according to the difference of used particle material, and is specific as follows:
1) utilize metal micro-nano particle 9 with the evanescent field energy delivery near field to the far field
The characteristic dimension of used metal micro-nano particle 9 is controlled at 0.1 λ-10 λ, and λ is the long wavelength of incident light source.Metal micro-nano particle 9 is distributed in around the sensor fibre sensitive segment 6 through suspended pattern,, has destroyed the electric neutrality of certain regional area in the plasma of metal micro-nano particle 9, cause electronics superfluous because the evanescent field excitation produces certain disturbance.The electric field that excess electron produces forces electronics certain part from the ruined zone of electric neutrality outwards to be moved, and is too much from the electronics that go out this part, zone, produces reversed electric field, electronics is retracted but can not in time stop, and occurs superfluous once more.Said process constantly back and forth, formed the collective oscillation of a large amount of electronics in the plasma.The metal micro-nano particle 9 that suspension is distributed in sensor fibre sensitive segment 6 is induced to the far-field region with the evanescent field energy near field after forming the dipole vibration under the excitation of evanescent field.
2) utilize medium micro-nano particle 10 with the evanescent field energy delivery near field to the far field
The refractive index of used medium micro-nano particle 10 is 0.8n-3n, and n is the fiber core refractive index, and characteristic dimension is controlled at 0.01 λ-100 λ, and λ is the long wavelength of incident light source.Medium micro-nano particle 10 be suspended in sensor fibre sensitive segment 6 around; When incident wavelength is compared with the size of Jie's micro-nano plasmid 10 mutually; The resonance effects of shape appears relying on; Evanescent field is after the scattering of medium micro-nano particle 10, refraction, transmission effect, and asymmetric distribution appears in field energy, therefore can utilize the be delivered to far field of effects such as the scattering of evanescent field energy on medium micro-nano particle, refraction, transmission with near-field energy.
Utilize metal micro-nano particle 9 and of the simulation example explanation of medium micro-nano particle 10 with the evanescent field energy far fieldization near field:
1) fiber core refractive index of used sensor fibre 5 is 1.4457, and radius is 8 μ m, optical source wavelength 1.55 μ m.Particle is the elliposoidal nano Au particle, its DIELECTRIC CONSTANTS
rFor-6.2403+0.54037i; The characteristic dimension of ellipsoid particle is respectively two kinds of major axis 700nm, minor axis 200nm and major axis 1.5 μ m, minor axis 0.5 μ m; The surrounding environment refractive index is 1.33; With ellipsoid gold micro-nano particle being suspended in around the sensor fibre sensitive segment 6 at random, the ellipsoid interparticle distance is that 200nm～500nm does not wait, and the distribution of metal micro-nano particle magnetic field z durection component field energy is shown like Fig. 5; Can obtain fibre core evanescent field energy on every side and can be delivered to 4.5 μ m, can realize the evanescent field energy near field is realized the far fieldization by 1 μ m.
2) fiber core refractive index of used sensor fibre 5 is 1.4457, and radius is 8 μ m, optical source wavelength 1.55 μ m.The refractive index of medium micro-nano particle 10 is 1.47, and radius is that the spherical medium micro-nano particle of 500nm, 200nm, 800nm and the distance of fibre core are respectively 100nm, 200nm, 300nm, and the environment refractive index is 1.33.The energy profile of electric field z component is as shown in Figure 6; The reach that can obtain evanescent field expands to 3 μ m by 1 initial μ m; Can realize sensing is carried out in evanescent field energy delivery to the far field near field; Make test substance take place wider, more completely with more interaction, thereby make information that sensor surveys more comprehensively, fidelity and highly sensitive more.
The above; Be merely the embodiment among the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; Conversion or the replacement expected can be understood, all of the present invention comprising within the scope should be encompassed in.
Claims (7)
1. the method for sensing of a far field fiber evanescent field is characterized in that, said sensing step comprises as follows:
Step S1: the sensor fibre sensitive segment is hung within the reaction tank; Utilize the micro-nano particle to modify measured object liquid; Measured object liquid is fully mixed with the micro-nano particle, obtain micro-nano particle and the well-mixed suspension of measured object liquid, and the micro-nano particle suspension is distributed in the measured object liquid;
Step S2: the measured object liquid that will contain the micro-nano particle is poured in the groove in the reaction tank device, the micro-nano particle through the measured object liquid suspension around the sensor fibre sensitive segment, make fiber evanescent field sensor fibre around form micro-nano particle network array;
Step S3: the micro-nano effect of utilizing the micro-nano particle with the evanescent field energy delivery near field to the far field.
2. the method for sensing of far field fiber evanescent field according to claim 1 is characterized in that said reaction tank device making step is following:
Step S11: process a groove in rectangular-shaped dimethyl silicone polymer reaction tank support portion and be used to hold measured object liquid, set a half-cylindrical passage at the groove two ends;
Step S12: sensor fibre in the half-cylindrical passage area and reaction tank support portion are bonding good with bonding agent, constitute the detecting means of integrative-structure.
3. the method for sensing of far field fiber evanescent field according to claim 1 is characterized in that, said groove is half-cylindrical, and the radius of half-cylindrical groove is 0.5mm-1cm.
4. like the method for sensing of the said far field of claim 3 fiber evanescent field, it is characterized in that the radius of said half-cylindrical passage is 0.3mm-0.5mm, be used to place sensor fibre.
5. the method for sensing of far field fiber evanescent field according to claim 1 is characterized in that described micro-nano particle comprises metal micro-nano particle and medium micro-nano particle.
6. like the method for sensing of the said far field of claim 5 fiber evanescent field, it is characterized in that the characteristic dimension of said metal micro-nano particle and medium micro-nano particle is controlled at 0.01 λ-100 λ, λ is the long wavelength of incident light source.
7. like the method for sensing of the said far field of claim 5 fiber evanescent field, it is characterized in that the refractive index of said medium micro-nano particle is 0.8n-3n, n is the fiber core refractive index of used sensor fibre.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287146A (en) * | 2018-01-17 | 2018-07-17 | 合肥工业大学 | Based on evanescent field principle polymer optical fiber Random Laser sensing testing method |
| CN111157490A (en) * | 2020-01-08 | 2020-05-15 | 暨南大学 | Micro-nano optical fiber long-period grating refractive index sensor |
| CN114322863A (en) * | 2021-12-08 | 2022-04-12 | 深圳大学 | Method for far-field illumination and detection of diffraction-limit-breaching objects |
-
2011
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| HE YAN 等: "Novel index-guided photonic crystal fiber surface-enhanced Raman scattering probe", 《OPTICS EXPRESS》 * |
| KEITA MITSUI 等: "Optical fiber affinity biosensor based on localized surface plasmon resonance", 《APPLIED PHYSICS LETTERS》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287146A (en) * | 2018-01-17 | 2018-07-17 | 合肥工业大学 | Based on evanescent field principle polymer optical fiber Random Laser sensing testing method |
| CN108287146B (en) * | 2018-01-17 | 2021-05-04 | 合肥工业大学 | Polymer optical fiber random laser sensing test method based on evanescent field principle |
| CN111157490A (en) * | 2020-01-08 | 2020-05-15 | 暨南大学 | Micro-nano optical fiber long-period grating refractive index sensor |
| CN114322863A (en) * | 2021-12-08 | 2022-04-12 | 深圳大学 | Method for far-field illumination and detection of diffraction-limit-breaching objects |
| CN114322863B (en) * | 2021-12-08 | 2023-05-05 | 深圳大学 | Method for far-field illumination and detection of objects that break through diffraction limits |
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