CN105738007A - Biconical polymer optical fiber probe and preparation method thereof and temperature sensor - Google Patents
Biconical polymer optical fiber probe and preparation method thereof and temperature sensor Download PDFInfo
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- CN105738007A CN105738007A CN201610077170.9A CN201610077170A CN105738007A CN 105738007 A CN105738007 A CN 105738007A CN 201610077170 A CN201610077170 A CN 201610077170A CN 105738007 A CN105738007 A CN 105738007A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
Abstract
The invention discloses a biconical polymer optical fiber probe and a preparation method thereof and a temperature sensor, and belongs to the technical field of an optical fiber temperature sensor and a manufacturing method thereof. According to the biconical polymer optical fiber probe, the middle part of any one segment of an optical fiber is manufactured into a conical structure surface which is symmetrically arranged with the thin middle and two thick ends without changing the internal structure of the fiber core, and a temperature sensitive material layer is coated on the conical structure surface and the conical structure surface is matched with the temperature sensitive material layer to form a cylindrical structure. According to the symmetrical biconical structure, transmission and refraction of the internal part of the fiber core are not influenced, and the change of the refractive index is not influenced so that accuracy of theoretical analysis can be effectively enhanced and measurement sensitivity is high. According to the preparation method of the biconical polymer optical fiber probe, the polishing and rotating grinding method is adopted so that real-time measurement can be realized, the length and the circular cross section size of the biconical structure can be accurately controlled, and accuracy can be effectively enhanced by the rotating polishing method.
Description
Technical field
The invention belongs to the technical field of fibre optic temperature sensor and manufacture method thereof, be specifically related to a kind of biconial polymer optical fiber probe and preparation method thereof and temperature sensor.
Background technology
Along with the fields such as modern industry, space technology, military affairs are progressively to automatization and intelligent development, the requirement of the sensitivity of sensor, precision, reliability etc. is continuously increased, optical fiber sensor because it is highly sensitive, fast response time little, corrosion-resistant compared with strong anti-electromagnetic interference capability, good dynamic range, volume, networking, distributed, multiple spot, big region, the advantage such as synchronous detecting, enjoy the favor of domestic and international expert and user.The device of plastic polymer optical fiber perceptually signal is compared with glass optical fiber has more advantage:
1, plastic optical fiber light weight, softness, more resistant to destroying (vibration and bending).Plastic polymer optical fiber has hot strength, the ruggedness of excellence and the little feature that takes up room.Pliable and tough, less Young's modulus, bigger thermo-optical coeffecient and bigger thermal coefficient of expansion, so polymer light fiber sensor can provide higher sensitivity and broader response range；
2, polymer optical fiber transceiver module uses the HONGGUANG of 650nm wavelength, very safe, and user also easily determines that whether the connection of optical fiber is successful as seen.The light emitting diode (LED) of visible light wave range can being used as electrical/optical or optical electrical switching device as signal transport vehicle, direct voltage output signal makes demodulating system cost be greatly reduced；
3, having better bend performance, core diameter big, numerical aperture is big, high with the coupling efficiency of light source and receptor, and end face processing is simple, have easy connected mode and the advantage such as simple interface unit.
Based on the advantage of the existing Fibre Optical Sensor of sensor of polymer optical fiber, and directly the output signal of telecommunication is prone to compatible with other electricity class sensor-based system, has fairly obvious intrinsic advantage and application potential.Therefore polymer optical fiber is with a wide range of applications at sensory field, but the inconspicuous sensor that cannot function as of optical transport energy variation is used by general polymer optical fiber, therefore, develop and there is polymer optical fiber structure because have sensitivity characteristic be to external world significant.
Summary of the invention
It is an object of the invention to provide a kind of biconial polymer optical fiber probe and preparation method thereof and temperature sensor, this biconial polymer optical fiber sonde configuration is reasonable in design, it is easy to make；Temperature sensor measurement based on biconial polymer optical fiber probe is highly sensitive, effective.
The present invention is achieved through the following technical solutions:
The invention discloses a kind of biconial polymer optical fiber probe, including the outer quilt of optical fiber kernel and optical fiber, optical fiber kernel is made up of fibre core and surrounding layer；
On any one section of fibre-optical probe, the two ends of fibre core are cylindrical section, middle part couples section for biconial, and this biconial coupling section is made up of biconial structural area and the temperature-sensitive material layer being coated on outside biconial structural area, and middle thin two ends, biconial structural area are thick and are arranged symmetrically with；Match formation cylindrical-shaped structure with temperature-sensitive material layer in biconial structural area, and this cylindrical-shaped structure is identical with the cylindrical section radius at fibre core two ends.
Being also wrapped on outward armored protective layer outside optical fiber, the cladding region of this armored protective layer includes the cylindrical section at the biconial coupling section in the middle part of fibre core and fibre core two ends.
The least radius boring district in the middle part of biconial coupling section is r0, and the radius of fibre core is r1, and r0 is r1 0.2～0.9 times.
The length of biconial coupling section is 10～100mm.
The preparation method that invention additionally discloses a kind of biconial polymer optical fiber probe, comprises the following steps:
1) light probe includes optical fiber kernel and the outer quilt of optical fiber, and optical fiber kernel is made up of fibre core and surrounding layer；Select on fibre-optical probe any one section, remove the outer quilt of optical fiber with wire stripper；
2) by removing, optical fiber is outer is polished until forming the biconial structural area that middle thin two ends are thick and symmetrical by rear exposed rotation limit, fibre core sand for surface trimming；
3) applying temperature-sensitive material layer outside biconial structural area, make biconial structural area match with temperature-sensitive material layer formation cylindrical-shaped structure, this cylindrical-shaped structure is identical with the cylindrical section radius at fibre core two ends.
Being additionally included in the outside cladding armored protective layer of the outer quilt of optical fiber, this armored protective layer cladding region includes the cylindrical section at the biconial coupling section in the middle part of fibre core and fibre core two ends.
Step 2) when preparing biconial structural area, use slide gauge to carry out real-time measurement, polishing size meets radius of target size, and the least radius boring district in the middle part of biconial coupling section is r0, and the radius of fibre core is r1, r0 is 0.2～0.9 times of r1.
The invention also discloses a kind of temperature sensor, including chopper, biconial polymer optical fiber probe, lock-in amplifier, manipulator, photodetector and computer terminal；
Chopper is arranged in the optical path of incident light of biconial polymer optical fiber probe, light source is by after biconial polymer optical fiber probe, signal is passed to lock-in amplifier, and signal is stored in computer terminal then through photodetector after amplifying, and chopper is connected by manipulator with photodetector；
Described biconial polymer optical fiber is popped one's head in, and including the outer quilt of optical fiber kernel and optical fiber, optical fiber kernel is made up of fibre core and surrounding layer；On any one section of fibre-optical probe, the two ends of fibre core are cylindrical section, middle part couples section for biconial, this biconial coupling section thick by thin two ends, centre and that be arranged symmetrically with biconial structural area and the temperature-sensitive material layer being coated on outside biconial structural area are constituted, and match formation cylindrical-shaped structure with temperature-sensitive material layer in biconial structural area.
Also being coated with armored protective layer in the outside of fibre core, this armored protective layer cladding region includes the cylindrical section at the biconial coupling section in the middle part of fibre core and fibre core two ends, and this cylindrical-shaped structure is identical with the cylindrical section radius at fibre core two ends.
If the least radius boring district in the middle part of biconial coupling section is r0, the radius of fibre core is r1, then r0 is 0.2～0.9 times of r1；The length of biconial coupling section is 10～100mm
Compared with prior art, the present invention has following useful technique effect:
Biconial polymer optical fiber disclosed by the invention is popped one's head in, under the premise not changing fibre core internal structure, the middle part of any one section of optical fiber is fabricated to the biconial structural area that middle thin two ends are thick and are arranged symmetrically with, and outside this biconial structural area, it being covered with temperature-sensitive material layer, match formation cylindrical-shaped structure with temperature-sensitive material layer in biconial structural area.The biconial structure of this symmetry, does not affect the transmission refraction within fibre core, and refractive index change does not produce impact such that it is able to is effectively improved the accuracy of theory analysis, measures highly sensitive.
Further, being also coated with armored protective layer in the outside of fibre core, this armored protective layer cladding region includes the cylindrical section at the biconial coupling section in the middle part of fibre core and fibre core two ends, effectively plays protective effect.
The least radius boring district in the middle part of biconial coupling section is r0, and the radius of fibre core is r1, and r0 is r1 0.2～0.9 times.The experiment proved that, the central cone district radius r0 more sluggishness of biconial coupling section is more high, and biconial structural region length L is more long, and sensitivity is more high.
The preparation method of biconial polymer optical fiber disclosed by the invention probe, adopts the mode of frosted rotary-grinding, it is possible to be effectively improved degree of accuracy.Fiber core refractive index (1.49) is more than optical fiber jacket refractive index (1.4), in transmitting procedure, when the interface of optical transport to fibre core and surrounding layer, when angle of incidence will produce total reflection more than critical angle, light is limited in fibre core transmit, be unfavorable for Fibre Optical Sensor.By the mode that frosted is polished, it is possible to remove the surrounding layer of optical fiber, make originally to occur the light of reflection to reflect, make tapered segment occur the light of leakage to increase, be retained in Optical fiber relay and resume defeated light minimizing, thus the light intensity detected reduces.The present invention as the ultimate principle of temperature sensor be the change of sensor surrounding-temperature corresponding with the change of the transmission energy detected directly between relation.The light intensity knots modification detected can be increased, thus improving its sensing sensitivity by frosted polishing.In rotary-grinding process, pass through real-time measurement, it is simple to accurately control biconial structure length, circular section size, thus ensureing accuracy and the concordance of sensor production.
Temperature sensor disclosed by the invention, based on above-mentioned biconial polymer optical fiber probe, the biconial structure of its symmetry, do not affect the transmission refraction within fibre core, refractive index change does not produce impact such that it is able to is effectively improved the accuracy of theory analysis, measures highly sensitive.This arrangement of temperature sensor is simple, with low cost, highly sensitive, and the advantage such as be swift in response.The present invention can be used for needing the various occasions of acquisition temperature real time data based on the high-precision sensing measurement of polymer optical fiber loss mechanisms.
Accompanying drawing explanation
Fig. 1 is biconial polymer optical fiber of the present invention probe cross-sectional view；
Fig. 2 is biconial polymer optical fiber of the present invention probe biconial regional structure schematic diagram；
Fig. 3 is biconial polymer optical fiber of the present invention probe perspective view；
Fig. 4 is the experimental provision schematic diagram of the biconial polymer optical fiber temperature sensor of the present invention；
Fig. 5 is that the present invention is embodied as sensor construction optimization contrived experiment datagram, and wherein, (a) is that pyramidal structure length transformation temperature measures figure；B () measures figure for pyramidal structure tapering transformation temperature；
Wherein, 1 is fibre core；2 is surrounding layer；3 is the outer quilt of optical fiber；4 is biconial structural area；5 is temperature-sensitive material layer；6 is armored protective layer；7 is light source；8 is chopper；9 pop one's head in for biconial polymer optical fiber；10 is lock-in amplifier；11 is manipulator；12 is photodetector；13 is computer terminal.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
Embodiment 1
The step single mode polymer optical fiber that experimental selection fiber optics MIT produces, concrete model is SMLH4001；Referring to Fig. 1, polymer optical fiber is formed by 3 two parts by optical fiber kernel and optical fiber are outer.In optical fiber, nuclear diameter is 1.00mm, is made up of fibre core 1 and surrounding layer 2.Fibre core 1 is made up of polymethyl methacrylate, and refractive index is 1.492, and the diameter of fibre core 1 is 980 μm；Fibre core surrounding layer 2 is made up of fluororesin, and refractive index is 1.402, and surrounding layer thickness is 0.02mm；Optical fiber is outer to be made up of polyethylene by 3, acts primarily as protective effect, and diameter is 2.20mm.Polymer optical fiber numerical aperture NA=0.467, loss is 200dB/km, and the normal working temperature of optical fiber is-55 DEG C～70 DEG C.
Referring to Fig. 2 and Fig. 3, the biconial polymer optical fiber probe of the present invention, outer by 3 including optical fiber kernel and optical fiber, optical fiber kernel is made up of fibre core 1 and surrounding layer 2；
On any one section of fibre-optical probe, the two ends of fibre core 1 are cylindric, middle part couples section for biconial, this biconial coupling section is the biconial structural area 4 that middle thin two ends are thick and are arranged symmetrically with, temperature-sensitive material layer 5 it is covered with outside pyramidal structure face 4, match formation cylindrical-shaped structure with temperature-sensitive material layer 5 in biconial structural area 4, and this cylindrical-shaped structure is identical with the cylindrical section radius at fibre core 1 two ends.
Preferably, being also coated with armored protective layer 6 in the outside of fibre core, this armored protective layer 6 is coated with region and includes the cylindrical section at the biconial coupling section in the middle part of fibre core 1 and fibre core 1 two ends.
The preparation method of biconial polymer optical fiber probe is as follows:
Fibre Optical Sensor biconial structure division can pass through clipping, sand paper and carefully polish formation.First, being removed by polyethylene serving 3 wire stripper, carefully polishes with 320 model sand paper in exposed fibre core 1 surface.Adopt the mode of rotation limit, limit polishing, ensure that the biconial structure division cross section of processing is held round, central area repeats to polish smooth with fine sandpaper after thick one-level can be adopted levigate again, bruting process can be used vernier caliper measurement central area size at any time, it is simple to accurately control biconial structure length, circular section size, until in the middle of being formed thin two ends thick symmetrically and evenly and meet the biconial structural area 4 of aimed dia size, as shown in Figure 2, sensing length L, center radius r0, two ends radius r1.Meanwhile, the conical region isopropanol machining formation is carried out.Coupling section outer layer at biconial and apply temperature-sensitive material 5, make profile cylindrical form, temperature-sensitive material 5 is outer plus armored protective layer 6.Above-mentioned diconical coupling section central cone district least radius r0 is 0.2～0.9 times of fiber core radius r1, and the central cone district radius r0 more sluggishness of biconial coupling section is more high.Above-mentioned biconial coupled zone segment length L can between 10～100mm.
Referring to Fig. 4, based on the temperature sensor of above-mentioned biconial polymer optical fiber probe, including chopper 8, biconial polymer optical fiber probe 9, lock-in amplifier 10, manipulator 11, photodetector 12 and computer terminal 13；The light of 200Hz is allowed to enter biconial probe 9 by optical fiber by light source 7 by chopper 8, by lock-in amplifier 10, signal passed to photo-detector 12 and be ultimately stored on computer 13, simultaneously, manipulator 11 is adopted to connect chopper 8 and photodetector 12, signal is received and amplifies by signal processing unit lock-in amplifier 10, reaction interval temperature changes and can cause the transmission energy variation of sensor fibre, and the change of transmission energy and the variation relation of surrounding (temperature) are exactly the ultimate principle of Fibre Optical Sensor.Lock-in amplifier 10 is mainly by Data Acquisition System for Correlation Experiment, and removes noise and interference.Photodetector 12 is stored in signal processing unit after converting optical signals into the signal of telecommunication carries out data storage cell data process and is stored in computer 13 and can obtain temperature variations.
Embodiment 2
On the basis of above-described embodiment 1, central cone district radius r0=480 μm of biconial coupling section, other parameter constants, test biconial coupled zone segment length L situation of change, being respectively adopted three kinds of situations of L=20mm, 40mm and 60mm, result is shown in Fig. 5 (a).
Embodiment 3
On the basis of embodiment 1, by biconial coupled zone segment length L=60mm, other parameter constants, the central cone district radius r0 situation of change of test biconial coupling section, being respectively adopted r0=240 μm, 480 μm and 600 μm of three kinds of situations, result is shown in Fig. 5 (b).
It is embodied as the experimental result of the experimental data conversion obtained, participates in table 1 below:
In conjunction with the embodiments 2,3, from this table it can be seen that make the biconial polymer optical fiber temperature sensor of different model respectively according to different taper lengths and diameter.When diameter 480 μm, sensor experiment result sensitivity and resolution corresponding to sensing length L respectively 20mm, 40mm and 60mm are it can be seen that biconial structural region length L is more long, and sensitivity is more high.Sensing length L is 6.0 centimetres, diameter 240 μm respectively, and 480 μm and 600 μm of experimental result sensitivity and resolution are it can be seen that central cone district radius r0 is more little, and sensitivity is more high.
By to biconial structure of the present invention: taper length and tapering are optimized design, measurement sensitivity can be effectively improved, the various occasions being applicable to temperature monitor in real time for this biconial polymer optical fiber temperature sensor with low cost provide theoretical and experimental basis, are conducive to the popularization and application of biconial polymer optical fiber temperature sensor of the present invention.
Claims (10)
1. a biconial polymer optical fiber probe, it is characterised in that including optical fiber kernel and optical fiber is outer by (3), optical fiber kernel is made up of fibre core (1) and surrounding layer (2)；
On any one section of fibre-optical probe, the two ends of fibre core (1) are cylindrical section, middle part couples section for biconial, this biconial coupling section by biconial structural area (4) and is coated on biconial structural area (4) temperature-sensitive material layer (5) outward and constitutes, and in the middle of biconial structural area (4), carefully two ends slightly and are arranged symmetrically with；Match formation cylindrical-shaped structure with temperature-sensitive material layer (5) in biconial structural area (4), and this cylindrical-shaped structure is identical with the cylindrical section radius at fibre core (1) two ends.
2. biconial polymer optical fiber according to claim 1 probe; it is characterized in that; being also wrapped on armored protective layer (6) outside the outer quilt (3) of optical fiber, the cladding region of this armored protective layer (6) includes the biconial coupling section at fibre core (1) middle part and the cylindrical section at fibre core (1) two ends.
3. biconial polymer optical fiber according to claim 1 probe, it is characterised in that the least radius boring district in the middle part of biconial structural area is r0, and the radius of fibre core (1) is r1, and r0 is r1 0.2～0.9 times.
4. biconial polymer optical fiber according to claim 1 probe, it is characterised in that the length of biconial coupling section is 10～100mm.
5. the preparation method of a biconial polymer optical fiber probe, it is characterised in that comprise the following steps:
1) light probe includes optical fiber kernel and the outer quilt (3) of optical fiber, and optical fiber kernel is made up of fibre core (1) and surrounding layer (2)；Select on fibre-optical probe any one section, remove optical fiber with wire stripper outer by (3)；
2) by outer for removal optical fiber fibre core (1) the sand for surface trimming rotation limit polishing exposed afterwards by (3) until forming the biconial structural area (4) that middle thin two ends are thick and symmetrical；
3) outside biconial structural area (4), temperature-sensitive material layer (5) is applied, making biconial structural area (4) match with temperature-sensitive material layer (5) formation cylindrical-shaped structure, this cylindrical-shaped structure is identical with the cylindrical section radius at fibre core (1) two ends.
6. the preparation method of biconial polymer optical fiber according to claim 5 probe; it is characterized in that; being additionally included in optical fiber outer by outside cladding armored protective layer (6) of (3), this armored protective layer (6) cladding region includes the biconial coupling section at fibre core (1) middle part and the cylindrical section at fibre core (1) two ends.
7. the preparation method of biconial polymer optical fiber according to claim 5 probe, it is characterized in that, step 2) when preparing biconial structural area (4), slide gauge is used to carry out real-time measurement, polishing size meets radius of target size, boring the least radius in district in the middle part of biconial coupling section is r0, and the radius of fibre core (1) is r1, r0 is 0.2～0.9 times of r1.
8. a temperature sensor, it is characterized in that, including chopper (8), biconial polymer optical fiber probe (9), lock-in amplifier (10), manipulator (11), photodetector (12) and computer terminal (13)；
Chopper (8) is arranged in the optical path of incident light of biconial polymer optical fiber probe (9), light source is by after biconial polymer optical fiber probe (9), signal is passed to lock-in amplifier (10), signal is stored in computer terminal (13) then through photodetector (12) after amplifying, and chopper (8) is connected by manipulator (11) with photodetector (12)；
Described biconial polymer optical fiber probe (9), outer by (3) including optical fiber kernel and optical fiber, optical fiber kernel is made up of fibre core (1) and surrounding layer (2)；On any one section of fibre-optical probe, the two ends of fibre core (1) are cylindrical section, middle part couples section for biconial, this biconial coupling section is thick by thin two ends, centre and the biconial structural area (4) that is arranged symmetrically with and be coated on biconial structural area (4) temperature-sensitive material layer (5) outward and constitute, match formation cylindrical-shaped structure with temperature-sensitive material layer (5) in biconial structural area (4), and this cylindrical-shaped structure is identical with the cylindrical section radius at fibre core (1) two ends.
9. temperature sensor according to claim 8; it is characterized in that; also be coated with armored protective layer (6) in the outside of fibre core, this armored protective layer (6) cladding region includes the biconial coupling section at fibre core (1) middle part and the cylindrical section at fibre core (1) two ends.
10. temperature sensor according to claim 8, it is characterised in that if the least radius boring district in the middle part of biconial coupling section is r0, the radius of fibre core (1) is r1, then r0 is 0.2～0.9 times of r1；The length of biconial coupling section is 10～100mm.
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| CN108225605A (en) * | 2018-02-07 | 2018-06-29 | 西安交通大学 | A kind of D-shaped polymer optical fiber probe, temperature sensor and preparation method |
| CN110207847A (en) * | 2019-06-27 | 2019-09-06 | 西安柯莱特信息科技有限公司 | A kind of temperature detection structure |
| CN114137663A (en) * | 2021-12-09 | 2022-03-04 | 浙江大学 | Light scattering patch device and preparation method thereof |
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| CN114137663A (en) * | 2021-12-09 | 2022-03-04 | 浙江大学 | Light scattering patch device and preparation method thereof |
| CN114137663B (en) * | 2021-12-09 | 2022-07-26 | 浙江大学 | Light scattering patch device and preparation method thereof |
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Application publication date: 20160706 |