CN103148957A - Twin-core photonic crystal fiber-based interferometric temperature sensing method and device - Google Patents
Twin-core photonic crystal fiber-based interferometric temperature sensing method and device Download PDFInfo
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- CN103148957A CN103148957A CN2013100674508A CN201310067450A CN103148957A CN 103148957 A CN103148957 A CN 103148957A CN 2013100674508 A CN2013100674508 A CN 2013100674508A CN 201310067450 A CN201310067450 A CN 201310067450A CN 103148957 A CN103148957 A CN 103148957A
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Abstract
The invention belongs to the field of optical fiber sensing, and relates to a twin-core photonic crystal fiber-based interferometric temperature sensing method and a twin-core photonic crystal fiber-based interferometric temperature sensing device. According to the method, stable interferometric fringes are formed by a twin-core photonic crystal fiber, a temperature sensitivity characteristic of the twin-core photonic crystal fiber is utilized, the interferometric fringes can translate when temperature is changed, and a linear relationship between the translation of the interferometric fringes and the temperature is calibrated so as to obtain temperature to be detected. The device comprises a laser, a precision optical fiber coupler, the twin-core photonic crystal fiber, a charge-coupled device (CCD), an image acquisition card and a computer. Light emitted by the laser is coupled by the precision optical fiber coupler, and enters the incident end of the twin-core photonic crystal fiber, and the stable interferometric fringes are formed after the light passes through the twin-core photonic crystal fiber, and are acquired by the CCD, the image acquisition card and the computer for digital image processing. The method and the device are high in interference resistance and sensitivity, and can be used for temperature measurement in the fields of machinery, petroleum, chemical industry, biology, medicine and the like.
Description
Technical field
The invention belongs to sensory field of optic fibre, and in particular to the method and apparatus based on double-core photonic crystal fiber interference-type TEMP.
Background technology
The species of fibre optic temperature sensor is a lot, can be divided mainly into light transmission type and sensing type.Light transmission type temperature sensor, optical fiber only plays leaded light, not as sensing element.Sensing type temperature sensor, optical fiber is used as light-conductive media and sensing element simultaneously.In sensing type temperature sensor, the optical fiber sensing of principle and Fabry-Bo Luo principle of interferences based on phase place change has stronger practicality.But the control difficulty of two Optical Fiber Transmission arms of Mach-Zehnder interference optical fiber temperature sensor is larger, and very flexible, miniaturization is difficult；Fabry-glass Luo Gan, which relates to fibre optic temperature sensor, to be needed to produce multi interference in inside of optical fibre multiple reflections, is required high to end face, is added the complexity of making.
In recent years, fiber grating makes sensing type fibre optic temperature sensor obtain significant progress, and temperature is obtained by analyzing the reflection of fiber grating or the centre wavelength drift value of transmitted spectrum.However, fiber-optic grating sensor is difficult to high temp sensitive, because fiber grating can degenerate in high temperature.
The appearance of photonic crystal fiber brings huge change to sensory field of optic fibre, breaches the development bottleneck of sensing type fibre optic temperature sensor.Photonic crystal fiber is also known as microstructured optical fibers, and periodicity close-packed arrays the airport of wavelength magnitude in cross-sectional direction.Compare traditional fiber, and double-core photonic crystal fiber has many superior characteristics, humorous, the high birefringence of such as permanent single mode transport, dispersion-tunable, great mode field area.Double-core photonic crystal fiber has two guide-lighting fibre cores, and it has the superiority of uniqueness in terms of Mode Coupling, polarization beam splitting, sensing.Interference fringe is produced using the interference effect of the two-beam of double-core photonic crystal fiber output end, when being acted on by temperature, because the thermal coefficient of expansion bending difference for causing two fibre cores different with thermo-optical coeffecient of air with quartz causes different transmission optical path differences, there are different phases in output end, so as to cause the translation of interference fringe.TEMP is realized by the translational movement for analyzing interference fringe.The single operation using double-core photonic crystal fiber and the difficulty of control can be reduced.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, and in particular to the method and apparatus based on double-core photonic crystal fiber interference-type TEMP.
Method based on double-core photonic crystal fiber interference-type TEMP is to bend the intermediate stage of double-core photonic crystal fiber or be coiled into fiber optic loop, and two ends are connected with accurate fiber coupler and CCD respectively.Its purpose is to eliminate the influence of cladding mode, laser is set to be propagated in two fibre cores of double-core photonic crystal fiber, so that laser forms stable interference fringe in double-core photonic crystal fiber outgoing end face.In the case that two fibre core bending radius are different, the phase difference between two fibre cores is not zero, therefore the minor variations of degree of crook can all cause the movement of interference fringe.There is an airport between the fibre core of double-core photonic crystal fiber two, because the thermal coefficient of expansion of air is much larger than quartzy silicon, therefore when the temperature is changed, violent effect of expanding with heat and contract with cold occurs for airport, distance changes between causing the fibre core of double-core photonic crystal fiber two of bending, so as to cause the phase difference between two fibre cores to change.In the case where temperature rises, airport expands, and the phase difference variable between two fibre cores is big, and interference fringe can be moved to some direction.Conversely, in the case of a temperature drop, airport shrinks, the phase difference between two fibre cores diminishes, and interference fringe can be moved in the opposite direction.Interference fringe is gathered by CCD, and is directed into computer through image pick-up card, and by digital image processing method, the interference fringe collected can extract out the skeleton line of single pixel point.Such as T1During temperature, the pixel position of skeleton line is A1；T2During temperature, the pixel position of skeleton line is A2.By calculating A1With A2The difference of skeleton line, you can obtain the corresponding relation of temperature and skeleton line position.
Device based on double-core photonic crystal fiber interference-type TEMP includes laser, accurate fiber coupler, double-core photonic crystal fiber, CCD, image pick-up card, computer.The light that laser is sent is coupled into the incidence end of double-core photonic crystal fiber by accurate fiber coupler, and stable interference fringe is formed after double-core photonic crystal fiber, by CCD, image pick-up card and computer acquisition and carries out Digital Image Processing.Laser requires output single-mode laser, and purpose reduces the difficulty that interference fringe differentiates to exclude influence of the multi-mode laser to interference fringe.In the case of straight short double-core photonic crystal fiber, substantial amounts of cladding mode is present in inside of optical fibre, it is difficult to form interference fringe, therefore fibre-optical bending or coiling before optical fiber sensing need to be popped one's head in are circularized, and make fiber lengths slightly longer, reduce the coupling of inside of optical fibre, laser is gathered in inside the fibre core of double-core photonic crystal fiber.And the number of turns and bending radius that double-core photonic crystal fiber is coiled can be adjusted on demand.
The present invention uses interference fringe skeleton line extraction method, significantly improves the accuracy and precision of measurement.Strong interference immunity of the present invention, and with larger flexibility, available for machinery, oil, chemical industry, biology, medicine and other fields temperature survey.
Brief description of the drawings
Fig. 1 is the schematic diagram based on double-core photonic crystal fiber interference-type temperature sensing method and device；
Fig. 2 is the cross-sectional view of double-core photonic crystal fiber；
The bending schematic diagram for the double-core photonic crystal fiber that Fig. 3 is；
Fig. 4 is interference fringe Skeleton pixel in case study on implementation with the elevated change curve of temperature；
The change curve that Fig. 5 reduces for interference fringe Skeleton pixel in case study on implementation with temperature.
Embodiment
The embodiment to the method and apparatus based on double-core photonic crystal fiber interference-type TEMP of the present invention is illustrated below in conjunction with the accompanying drawings.
As shown in figure 1, the device based on double-core photonic crystal fiber interference-type TEMP is made up of laser 1, accurate fiber coupler 2, double-core photonic crystal fiber 3, CCD4, image pick-up card 5 and computer 6.The laser that laser 1 is sent is coupled into the front end of double-core photonic crystal fiber 3 by accurate fiber coupler 2, after double-core photonic crystal fiber 3 through bending conducts, interference fringe is formed in certain space after output end face, interference fringe is gathered by CCD4, and computer 6 is imported through image pick-up card 5, the skeleton line of interference fringe is extracted using digital image processing method.By calculating the change in location of skeleton line, and then try to achieve the variable quantity of temperature in temperature field.
As shown in Fig. 2 double-core photonic crystal fiber 3 is the photonic crystal fiber of the two-dimensional periodic structure with two fibre cores, host material is silica, and its cross section is made up of four layer of air holes, in regular hexagon.Fiber optic hub is the airport of an a diameter of 2.7um, and two fibre cores are symmetrically located at the both sides in center air hole, and fibre core is away from for 7.35um.
Double-core photonic crystal fiber is changed by the phase difference between the two beam laser for after the effect of environment temperature, resulting in interference fringe, so as to cause the movement of interference fringe.
As shown in figure 3, double-core photonic crystal fiber has two kinds of different bend modes.Wherein, in situation (a), two fibre core bending radius are different, and the phase difference between two fibre cores is not zero, and the minor variations of degree of crook can all cause the movement of interference fringe.And in situation (b), two fibre core bending radius are identical, the phase difference between two fibre cores is zero, and the minor variations of degree of crook will not cause the movement of interference fringe.There is an airport between two fibre cores of double-core photonic crystal fiber 3, because the thermal coefficient of expansion of air is much larger than quartzy silicon, therefore when the temperature is changed, violent effect of expanding with heat and contract with cold occurs for airport, cause bending double-core photonic crystal fiber 3 two fibre cores between distance change, so as to cause the phase difference between two fibre cores to change.In the case where temperature rises, airport expands, and the phase difference variable between two fibre cores is big, and interference fringe can be moved to some direction.Conversely, in the case of a temperature drop, airport shrinks, the phase difference between two fibre cores diminishes, and interference fringe can be moved in the opposite direction.The temperature probe of double-core photonic crystal fiber 3 is positioned in environment temperature to be measured.Start laser and image acquisition and processing software, when the temperature rise in temperature field, the interference fringe collected is moved towards some direction.
As shown in figure 4, with 1 DEG C for spacing, the translational movement of interference fringe when recording and calculating temperature field from 30 DEG C to 60 DEG C.Figure 4, it is seen that temperature is linearly related to the translational movement of interference fringe skeleton line, fitting show that the linearity is 98.8%, sensitivity be about -9.8 pixels/DEG C.
Change test condition and environment, when the temperature decreases, the interference fringe collected are moved in the opposite direction.As shown in figure 5, with 1 DEG C for spacing, the translational movement of interference fringe when recording and calculating temperature field from 60 DEG C to 30 DEG C.As seen from the figure, temperature is linearly related to the translational movement of interference fringe skeleton line, fitting draw the linearity be 99.9%, sensitivity be about 11.0 pixels/DEG C.
The embodiment of the present invention is described above in association with accompanying drawing; but these explanations can not be considered as limiting the scope of the present invention; protection scope of the present invention is defined by the claims, and any change on the basis of the claims in the present invention is all protection scope of the present invention.
Claims (8)
1. the method based on double-core photonic crystal fiber interference-type TEMP, it is characterised in that：Two fibre cores of double-core photonic crystal fiber can be coupled, and stable interference fringe is formed in the exit end of photonic crystal fiber；When environment temperature changes and acts on double-core photonic crystal fiber, due to the difference of the thermal coefficient of expansion and thermo-optical coeffecient of airport and quartz, the change of double-core photonic crystal fiber structure and transmission characteristic can be caused, change the fibre core spacing of double-core photonic crystal fiber, so that there is transmission optical path difference between two fibre cores, phase at fiber exit end changes, so as to cause the translation of interference fringe；
When wherein double-core photonic crystal fiber is by temperature action, the radius of curvature of two fibre cores should difference；Temperature is raised, and the optical path difference of two fibre core light beams becomes big, and interference fringe can be moved to a certain set direction；Conversely, temperature is reduced, interference fringe can be translated in the opposite direction, and the direction translated according to interference fringe can determine whether temperature rise or reduce.
2. the method according to claim 1 based on double-core photonic crystal fiber interference-type TEMP, it is characterised in that：Obtain after interference fringe image, Digital Image Processing, the pixel position of interference fringe skeleton line when extracting different temperatures must be passed through.
3. the method according to claim 2 based on double-core photonic crystal fiber interference-type TEMP, it is characterised in that：Temperature and the linear representation of interference fringe skeleton line pixel position are obtained by linear fit method.
4. based on the device of double-core photonic crystal fiber interference-type TEMP, including laser, accurate fiber coupler, double-core photonic crystal fiber, CCD, image pick-up card and computer, it is characterised in that：The laser that laser is sent is coupled into the input of double-core photonic crystal fiber by accurate fiber coupler, after being transmitted through double-core photonic crystal fiber, inputted by double-core photonic crystal fiber output end to CCD, CCD is connected to the input of image pick-up card, and the output end of image pick-up card is connected to computer.
5. the device according to claim 4 based on double-core photonic crystal fiber interference-type TEMP, it is characterised in that：The wavelength of laser is any wavelength in the range of near-infrared and visible light wave range.
6. the device according to claim 4 based on double-core photonic crystal fiber interference-type TEMP, it is characterised in that：Double-core photonic crystal fiber can be adjusted on demand using the double-core photonic crystal fiber bent, its bending radius.
7. the device according to claim 4 based on double-core photonic crystal fiber interference-type TEMP, it is characterised in that：Double-core photonic crystal fiber uses double-core photonic crystal fiber ring, and its number of turns coiled can be adjusted on demand.
8. the device according to claim 4 based on double-core photonic crystal fiber interference-type TEMP, it is characterised in that：In double-core photonic crystal fiber output end, stable interference fringe is formed, the length of double-core photonic crystal fiber can be random length.
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Cited By (5)
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| CN110927201A (en) * | 2019-12-11 | 2020-03-27 | 北京理工大学 | DIC-based thermal expansion phase change measurement method |
| CN112567219A (en) * | 2018-08-14 | 2021-03-26 | Fbg韩国公司 | Temperature measuring device using fiber grating sensor |
| CN115032737A (en) * | 2022-06-06 | 2022-09-09 | 北京航空航天大学 | Photonic crystal fiber associated imaging system based on wavelength modulation and method thereof |
| CN117686008A (en) * | 2024-02-01 | 2024-03-12 | 广东海洋大学 | Fiber Bragg grating signal demodulation system and method based on image processing |
| CN117686008B (en) * | 2024-02-01 | 2024-04-26 | 广东海洋大学 | Fiber Bragg grating signal demodulation system and method based on image processing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117686008A (en) * | 2024-02-01 | 2024-03-12 | 广东海洋大学 | Fiber Bragg grating signal demodulation system and method based on image processing |
| CN117686008B (en) * | 2024-02-01 | 2024-04-26 | 广东海洋大学 | Fiber Bragg grating signal demodulation system and method based on image processing |
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Effective date of registration: 20211104 Address after: Room 1904 and 1909, No. 80, Lane 1288, Wangyuan South Road, Fengxian District, Shanghai 201499 Patentee after: Shanghai Boming Scientific Instrument Co.,Ltd. Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University |