CN114137446A - Temperature sensitive magnetic field eliminating sensing device of FBG (fiber Bragg Grating) cascade optical fiber composite structure - Google Patents
Temperature sensitive magnetic field eliminating sensing device of FBG (fiber Bragg Grating) cascade optical fiber composite structure Download PDFInfo
- Publication number
- CN114137446A CN114137446A CN202111447946.9A CN202111447946A CN114137446A CN 114137446 A CN114137446 A CN 114137446A CN 202111447946 A CN202111447946 A CN 202111447946A CN 114137446 A CN114137446 A CN 114137446A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- temperature
- fbg
- fiber
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 95
- 239000000835 fiber Substances 0.000 title claims abstract description 67
- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 61
- 239000004038 photonic crystal Substances 0.000 claims abstract description 41
- 230000008859 change Effects 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 239000002121 nanofiber Substances 0.000 claims abstract description 10
- 238000001228 spectrum Methods 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims abstract description 6
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 3
- 238000005259 measurement Methods 0.000 claims description 38
- UXTMROKLAAOEQO-UHFFFAOYSA-N chloroform;ethanol Chemical compound CCO.ClC(Cl)Cl UXTMROKLAAOEQO-UHFFFAOYSA-N 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 230000035945 sensitivity Effects 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 13
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 8
- 230000004927 fusion Effects 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 239000012188 paraffin wax Substances 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 2
- 230000001808 coupling effect Effects 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002086 nanomaterial Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000004205 dimethyl polysiloxane Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 1
- -1 Polydimethylsiloxane Polymers 0.000 description 1
- 229910001329 Terfenol-D Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/007—Environmental aspects, e.g. temperature variations, radiation, stray fields
- G01R33/0082—Compensation, e.g. compensating for temperature changes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention provides a temperature-sensitive magnetic field eliminating sensing device of an FBG (fiber Bragg Grating) cascade optical fiber composite structure, which comprises a BBS (fiber Bragg Grating) light source (1), a circulator (2), a double-parameter measuring system (3), an OSA (4), a demodulation module (5) and a computer (6). The invention adopts the Mach-Zehnder interferometer principle and the FBG sensing principle, temperature-sensitive material cascade FBG coating sensitive material is filled in photonic crystal fiber for sensing, so that light beams generated by a BBS light source generate interference spectrum in the Mach-Zehnder interferometer formed by welding an optical fiber package, the photonic crystal fiber and multimode micro-nano fiber, the temperature is measured by detecting the interference spectrum, the change of a magnetic field is detected by a reflection peak generated by the FBG, and the demodulation is carried out by a demodulation module, and the influence of the temperature is eliminated by utilizing an analysis matrix.
Description
Technical Field
The invention belongs to the technical field of optical fiber sensing, and particularly relates to a sensing device for eliminating a temperature sensitive magnetic field of an FBG (fiber Bragg Grating) cascaded optical fiber composite structure.
Background
Compared with the traditional electronic sensor, the optical fiber sensor has higher sensitivity, can be remotely measured, is free from electromagnetic interference and small in size, can be used in severe environments such as high pressure, high temperature and corrosion, has flexibility in a light path, is convenient to connect with a computer and has higher flexibility in use, and researchers at present have developed a plurality of optical fiber sensors which can measure parameters such as temperature, stress and pressure. With the increasing social demands, the demands for multifunctional and small sensors are gradually expanding. The sensor capable of eliminating the temperature influence after double-parameter measurement of temperature and a magnetic field has the advantages of remote monitoring, extreme environment resistance, high safety, good insulativity, small electromagnetic interference, high measurement precision and sensitivity and wide detection range.
The sensing unit is welded with the photonic crystal fiber by using the optical fiber package and the multimode micro-nano fiber as couplers to form a Mach-Zehnder interferometer, and the change of the temperature enables an ethanol chloroform material in the photonic crystal fiber to change the refractive index so as to change the optical path of one interference arm of the Mach-Zehnder interferometer for measurement; in addition, the current can excite a magnetic field, the FBG is adhered to the GMM material, the GMM material generates magnetostriction when the magnetic field changes, so that the center wavelength of the FBG grid distance changes shifts to realize magnetic field measurement, and currently, an ethanol chloroform material and the GMM material are used as sensitive materials, or a sensor for double-parameter measurement by adopting an FBG cascade structure can realize multi-parameter monitoring of temperature, stress, pressure, vibration and the like. For example: in 2019, Zhang R et al (Zhang R, Pu S, Li Y, et al, Mach-Zehnder interferometer clamped with FBG for monolithic fields and temperature [ J ]. IEEE Sensors Journal,2019,19(11): 4079-; in 2019, Lei X Q et al (Lei X Q, Feng Y, Dong X P. high-temperature sensor based on a special thin-diameter fiber [ J ]. Optics Communications,2020,463:125386.) proposed that based on a special thin-diameter fiber sandwiched between two sections of multimode fibers, two sections of multimode fibers are used as couplers for manufacturing an all-fiber Mach-Zehnder interferometer for measuring temperature, the device is simple to manufacture and has the advantages of repeatability and low cost, but the device can only measure temperature above 100 ℃, and has low measurement sensitivity to low temperature; in 2020, Li J X et al (Li J X, Tong Z R, Zhang W H, Liu J W. "Research on multi-parametric characteristics of PCF sensor modified by GO composite films [ J ]". applied optics,2020,59:1-9) utilize photonic crystal fibers to manufacture Mach-Zehnder interferometers, and realize double-parameter measurement of temperature and humidity by filling alcohol in the photonic crystal fibers and coating GO, and the sensing unit realizes double-parameter measurement, but has complex manufacturing process and is not as simple as a cascade structure, and the sensor has short service life and low measurement sensitivity due to the fact that alcohol in the photonic crystal fibers is easy to volatilize; in 2020, Tong R et al (Tong R, ZHao Y, Hu H, et al. Large measurement range and high sensitivity temperature sensor with FBG shielded Mach-Zehnder interferometer [ J ]. Optics & Laser Technology,2020,125:106034.) cascade FBG and MZI to design a wide-range detectable optical fiber temperature sensor, wherein MZI is formed by single-mode optical fiber dislocation fusion, temperature-sensitive material Polydimethylsiloxane (PDMS) is coated in a dislocation fusion area, temperature is judged by FBG, and accurate temperature reading is realized by MZI; in 2020, Xia F et al (Xia F, ZHao Y, ZHEN H, et al. ultra-passive water heater temperature sensor using an FBG-shielded micro fiber MZI operating at measuring point [ J ]. Optics & Laser Technology,2020,132:106458.) propose an optical fiber sensor for sea water temperature detection, which adopts FBG and micro-nano fiber cascade structure to realize temperature detection, wherein the micro-nano fiber surface is coated with PDMS temperature-sensitive material to generate MZI, the cascade structure enhances sensitivity and detection range, the sensing unit realizes wide detection range of temperature, but has complex structure, and can only realize but measure; in 2021, Zhan B et al (Zhan B, Ning T, Pei L, et al. Terfenol-DBased Magnetic Field With Temperature compensated incorporation Dual Fiber Bragg Gratings [ J ]. IEEE Access,2021,9:32713-32720.) proposed that two FBGs were pasted on Terfenol-D material at different angles to achieve Temperature compensated Magnetic Field Sensor, which only achieves but parameter measurement and has complex demodulation Structure; in 2021, the refractive index of an ethanol-chloroform mixed solution at different temperatures was studied by using chloroform mixed alcohol by a photonic crystal fiber temperature sensor [ J/OL ] optical communication technology based on surface plasmon resonance (Yechuni, Chenhagui), et al (Yechuni, Chen, et al), and the refractive index of the ethanol-chloroform mixed solution at different temperatures was verified to enable the sensor to have better sensitivity, but the photonic crystal fiber of the sensor is relatively complex to manufacture and double-parameter measurement is not performed.
Disclosure of Invention
At present, researchers have realized measurement of parameters such as gas concentration, temperature, stress, magnetic field and the like by adopting photonic crystal fibers or Bragg grating fibers, and research and develop a plurality of temperature-sensitive materials and magnetic-sensitive materials, and the improvement of measurement sensitivity is realized by filling optical fibers or coating optical fibers. However, most of the devices have complicated cascade structures and low sensitivity, and cannot eliminate the influence of temperature or hardly eliminate the influence of temperature when measuring a magnetic field; the invention provides a magnetic field measuring sensor which has high sensitivity, can eliminate measurement of temperature parameter influence, has simple optical fiber manufacturing, high utilization rate and low manufacturing cost and is used for eliminating temperature influence by an ethanol chloroform material filling and GMM coated optical fiber composite structure by combining the advantages and the disadvantages of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the technical scheme is as follows: FBG cascades sensitive magnetic field sensing device of elimination temperature of optic fibre composite construction, its characterized in that: the device comprises a BBS light source (1), a circulator (2), a double-parameter measuring system (3), an OSA (4), a demodulation module (5) and a computer (6); wherein the OSA (4) is a spectrum analyzer;
the double-parameter measuring system (3) comprises a horizontal table A (3-1), a resistance box A (3-2), a solenoid A (3-3), a heating table (3-4), a sensing unit (3-5), a solenoid B (3-6), a resistance box B (3-7) and a horizontal table B (3-8), wherein:
a horizontal table A (3-1) and a horizontal table B (3-8) are respectively arranged on the left side and the right side of the heating table (3-4), the right end of a solenoid A (3-3) of the horizontal table A (3-1) is modulated into the N pole of the solenoid, the left end of a solenoid B (3-6) of the horizontal table B (3-8) is modulated into the S pole of the solenoid, the solenoid A (3-3), a sensing unit (3-5) and the solenoid B (3-6) form a straight line, and the sensing unit (3-5) is arranged on the heating table (3-4);
the sensing unit (3-5) is formed by cascading a single-mode fiber (3-5-1) containing a fiber package (3-5-2), a photonic crystal fiber (3-5-3), a multimode micro-nano fiber (3-5-4) and an FBG (3-5-5) to form an optical fiber composite structure, an air hole of the photonic crystal fiber (3-5-3) is filled with an ethanol chloroform material (3-5-7), and in addition, part of the FBG (3-5-5) is adhered to a GMM material (3-5-6) to form the sensing unit (3-5);
the specific preparation process of the sensing units (3-5) comprises the steps of manufacturing an optical fiber composite structure and coating a sensitive material;
wherein: the manufacturing of the optical fiber composite structure comprises the manufacturing of an optical fiber package (3-5-2) at the right end of a single mode optical fiber (3-5-1), the manufacturing of a photonic crystal optical fiber (3-5-3) filled with an ethanol chloroform material (3-5-7), the manufacturing of a multimode micro-nano optical fiber (3-5-4), and the manufacturing of a cascade structure of the single mode optical fiber (3-5-1) -the photonic crystal optical fiber (3-5-3) -the multimode micro-nano optical fiber (3-5-4) -FBG (3-5-5); firstly, preparing a single-mode optical fiber (3-5-1) right-end optical fiber package (3-5-2): intercepting a section of single-mode optical fiber (3-5-1) with the length of 5mm, placing the single-mode optical fiber (3-5-1) on a fusion splicer, and completing the preparation of an optical fiber package (3-5-2) structure by utilizing a spherical mode of the fusion splicer; preparation of Photonic Crystal fiber (3-5-3): cutting a section of photonic crystal fiber (3-5-3) with the length of 25mm, connecting a pinhole with one end of the photonic crystal fiber (3-5-3) by adopting an injector filled with prepared ethanol chloroform material (3-5-7), sealing the fiber and the pinhole by using molten paraffin, and slowly pushing the ethanol chloroform material (3-5-7) in the injector into the photonic crystal fiber (3-5-3) after the paraffin is cooled; preparing multimode micro-nano optical fibers (3-5-4): taking a section of multimode optical fiber with the length of 3mm, and tapering the multimode optical fiber into a micro-nano structure; the multimode micro-nano optical fiber (3-5-4), the photonic crystal fiber (3-5-3) in front and the optical fiber package (3-5-2) form a Mach-Zehnder interferometer, finally, the multimode micro-nano optical fiber (3-5-3) and the multimode micro-nano optical fiber (3-5-4) containing the optical fiber package (3-5-2) are sequentially welded from left to right by the three parts with the cut and smooth end faces to form a temperature sensing unit, and finally, the temperature sensing unit is welded with the FBG (3-5-5) with the grating area length of 20mm and the central wavelength of 1550nm by an optical fiber welding machine to form an optical fiber composite structure, wherein the outer diameters of all the optical fibers are the same;
the coating of the sensitive material mainly comprises the coating of a GMM material (3-5-6), wherein the grid region part of the FBG (3-5-5) in the dried composite structure is stuck to the surface of the GMM material (3-5-6) by adopting an epoxy resin material and stands for 48 hours;
the photonic crystal fiber (3-5-3) is filled with an ethanol chloroform material (3-5-7), and the preparation method of the ethanol chloroform material (3-5-7) comprises the following steps: 1:1 mixing the prepared ethanol and chloroform, and uniformly stirring, wherein the temperature of the ethanol is 78 ℃, and the temperature of the chloroform is 61 ℃, so that the measurement of the sensor is carried out in an environment below 60 ℃;
further, the temperature sensitive magnetic field sensing device for eliminating the FBG cascade optical fiber composite structure is characterized in that:
a BBS light source (1) emits a light beam to be transmitted to a circulator (2), the circulator (2) outputs the light beam to be transmitted to a sensing unit (3-5) in a double-parameter measuring system (3), the light beam generates interference in the sensing unit (3-5), when the light beam is transmitted to an optical fiber package (3-5-2) through a single-mode optical fiber (3-5-1), the optical fiber package (3-5-2) with a coupling effect enables a part of the light in a fiber core to enter a cladding, the light passes through the optical fiber package (3-5-2) and is conducted along an ethanol chloroform material (3-5-7) filled in the fiber core, the other part of the light is conducted along the fiber core of a photonic crystal optical fiber (3-5-3), and when the two parts of light are transmitted to a multimode micro-nano optical fiber (3-5-4), the light is coupled to generate Mach interference, when the temperature changes, the refractive index of the ethanol chloroform material (3-5-7) in the photonic crystal fiber (3-5-3) changes due to the temperature change, the optical path of light transmitted along the ethanol chloroform material (3-5-7) changes, the interference light changes, when a magnetic field in the double-parameter measurement system (3) changes, the GMM material (3-5-6) stretches due to the magnetostrictive effect, the grating pitch of the FBG (3-5-5) adhered to the GMM material (3-5-6) changes, interference light changes, the interference light transmits a reflection spectrum to the OSA (4) through the circulator (2) to display an interference spectrum, and the demodulation module (5) demodulates the OSA (4) and transmits the demodulation to the computer (6) to perform data processing so as to eliminate the influence of temperature on magnetic field measurement.
Further, the BBS light source (1) is a broadband light source with a center wavelength of 1550nm for generating optical signals.
FBG cascades optic fibre composite construction's elimination temperature sensitive magnetic field sensing device, its characterized in that:
when the double-parameter measuring system (3) measures the temperature, the heating table (3-4) is started, and the sensing unit (3-5) is placed on the heating table (3-4) to realize the measurement of the temperature sensitivity of the composite structure; and when measuring the magnetic field, the resistance box A (3-2) on the horizontal table A (3-1) is operated to change the magnetic field generated by the electrified solenoid A (3-3) so as to realize the measurement of the magnetic field, and finally, the influence generated by the temperature when measuring the magnetic field is eliminated by utilizing the analysis matrix method according to the tested temperature sensitivity.
The invention has the structure that: the FBG cascade optical fiber composite structure eliminates the temperature sensitive magnetic field sensing device.
Compared with the prior structure, the invention has the beneficial effects that:
the invention eliminates the influence of temperature on magnetic field measurement after realizing simultaneous measurement of temperature and magnetic field, can detect the environmental magnetic field relatively accurately in monitoring, has simple structure manufacturing method, small volume and extreme environment resistance, and meets the requirement of miniaturized monitoring equipment.
According to the invention, the photonic crystal fiber, the optical fiber package and the multimode micro-nano fiber are filled with the ethanol and chloroform to form the Mach-Zehnder interferometer to realize temperature measurement, compared with the traditional Mach-Zehnder structure, the device is simple to manufacture, low in cost and long in service life, errors caused by different lengths of the two arms are reduced, and the measurement sensitivity is greatly increased.
The FBG is pasted with the GMM material to realize magnetic field measurement, and compared with the coating of a magnetofluid material, the structure has strong reusability.
According to the invention, the temperature influence can be eliminated after the temperature is measured, the measurement precision is increased, and the accuracy is enhanced.
The invention can realize demodulation and output the result to the computer, and realize real-time monitoring and measurement.
Drawings
Fig. 1 is a structural diagram of a temperature-sensitive magnetic field sensing device with an FBG cascaded fiber composite structure.
Fig. 2 is a structural diagram of a sensing unit of a temperature-sensitive magnetic field sensing device with an FBG cascaded fiber composite structure.
Fig. 3 is a diagram of a dual parameter measurement system of a temperature-sensitive magnetic field sensing device for eliminating FBG cascaded fiber composite structure.
Detailed Description
The following embodiments will describe specific implementations of the temperature-insensitive magnetic field sensing apparatus with FBG cascaded fiber composite structure according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, for the structure diagram of the temperature-sensitive magnetic field sensing device for eliminating the FBG cascaded optical fiber composite structure provided by the present invention, a light beam emitted by a BBS light source (1) is transmitted to a circulator (2), the circulator (2) outputs the light beam to a single mode fiber (3-5-1) of a sensing unit (3-5) of a dual-parameter measurement system (3), the light beam is reflected at the FBG (3-5-5) through the single mode fiber (3-5-1) -photonic crystal fiber (3-5-3) -multimode micro-nano fiber (3-5-4), the reflected light is output to an OSA (4) through the circulator (2), when a heating platform (3-4) in the dual-parameter measurement system (3) is subjected to temperature change, the refractive index of an ethanol chloroform material (3-5-7) in the photonic crystal fiber (3-5-3) is changed, the interference effect of the Mach-Zehnder interferometer generated by the optical fiber package (3-5-2), the photonic crystal fiber (3-5-3) and the multimode micro-nano fiber (3-5-4) changes, and the temperature is measured by monitoring the change of interference light in the OSA (4); when a knob of a resistor box A (3-2) on a horizontal table A (3-1) is rotated to change the resistance in an access circuit, so that the current in a solenoid A (3-3) is changed, the magnetic field emitted by the energized solenoid A (3-3) is changed, a GMM material (3-5-6) generates magnetostriction, an FBG (3-5-5) adhered on the GMM material (3-5-6) generates the change of grid distance due to the magnetostriction effect, an interference spectrum reflection peak generated by the FBG (3-5-5) drifts, and the monitoring of the magnetic field is realized by monitoring the drift amount of an OSA (4); and outputting the data in the OSA (4) to a demodulation module (5), eliminating the influence of temperature through the demodulation module (5) by a matrix analysis method, outputting the result to a computer (6), obtaining the measurement data of the magnetic field, and further analyzing the measurement sensitivity of the sensing units (3-5).
As shown in fig. 2, for the structure diagram of the sensing unit of the temperature-sensitive magnetic field-eliminating sensing device with the FBG cascaded optical fiber composite structure provided by the invention, the optical fiber package (3-5-2) manufactured in the single-mode optical fiber (3-5-1) of the sensing unit (3-5), the photonic crystal optical fiber (3-5-3) filled with the ethanol chloroform material (3-5-7), and the tapered multimode optical fiber (3-5-4) are welded in sequence and then cascaded with the FBG (3-5-5), and the FBG (3-5-5) is partially adhered to the GMM material (3-5-6) and stands for 48 hours to be fully fixed, so as to form the sensing unit (3-5); a photonic crystal fiber (3-5-3) filled with an ethanol chloroform material (3-5-7), a fiber package (3-5-2) and a multimode micro-nano fiber (3-5-4) form a Mach-Zehnder interferometer, and the change of temperature is monitored; the FBG (3-5-5) adhered with the GMM material (3-5-6) monitors the change of the magnetic field; the detection principle is as follows: when the temperature changes, the refractive index of the ethanol chloroform material (3-5-7) in the photonic crystal fiber (3-5-3) changes due to the temperature change, the optical path of light transmitted along the interference arm of the ethanol chloroform material (3-5-7) changes, and then the interference light changes. When the magnetic field in the double-parameter measurement system (3) changes, the GMM material (3-5-6) stretches due to the magnetostrictive effect, the grating pitch of the FBG (3-5-5) adhered to the GMM material (3-5-6) changes, a reflection peak generated by the FBG (3-5-5) drifts, and the magnetic field is measured by monitoring the drift of the reflection peak. And then eliminating the influence of temperature by the measured temperature spectral line by using a matrix analysis method, and finally measuring the sensitivity of the magnetic field for eliminating temperature sensitivity.
As shown in fig. 3, in a system diagram of the sensing device for eliminating a temperature-sensitive magnetic field in an FBG cascaded fiber composite structure according to the present invention, a horizontal stage a (3-1) and a horizontal stage B (3-8) are respectively fixed with a solenoid a (3-3) and a solenoid B (3-6), the solenoid and a resistor box are connected in series after a power supply is applied to form a series circuit to enable a magnetic field generated in the solenoid, and the change of the magnetic field is realized when a knob of the resistor box a (3-2) is rotated. Wherein the horizontal stage A (3-1) and the horizontal stage B (3-1) are separated by a distance which can put down the heating stage (3-4), and the N pole of the solenoid A (3-3) at the left side and the S pole of the solenoid B (3-6) at the right side are oppositely arranged and are arranged in a straight line with the optical fiber on the sensing unit (3-5). The heating table (3-4) is placed between the left horizontal table A (3-1) and the right horizontal table B (3-8), the sensing unit (3-5) is placed on the heating table (3-4), and temperature measurement is realized when the heating table (3-4) is opened; the sensing units (3-5) are placed in a magnetic field environment to realize magnetic field measurement, and finally matrix analysis is utilized to eliminate the influence of temperature.
Claims (3)
- The temperature-sensitive magnetic field sensing device for eliminating the FBG cascade optical fiber composite structure is characterized in that: the device comprises a BBS light source (1), a circulator (2), a double-parameter measuring system (3), an OSA (4), a demodulation module (5) and a computer (6); wherein the OSA (4) is a spectrum analyzer;the double-parameter measuring system (3) comprises a horizontal table A (3-1), a resistance box A (3-2), a solenoid A (3-3), a heating table (3-4), a sensing unit (3-5), a solenoid B (3-6), a resistance box B (3-7) and a horizontal table B (3-8), wherein:a horizontal table A (3-1) and a horizontal table B (3-8) are respectively arranged on the left side and the right side of the heating table (3-4), the right end of a solenoid A (3-3) of the horizontal table A (3-1) is modulated into the N pole of the solenoid, the left end of a solenoid B (3-6) of the horizontal table B (3-8) is modulated into the S pole of the solenoid, the solenoid A (3-3), a sensing unit (3-5) and the solenoid B (3-6) form a straight line, and the sensing unit (3-5) is arranged on the heating table (3-4);the sensing unit (3-5) is formed by cascading a single-mode fiber (3-5-1) containing a fiber package (3-5-2), a photonic crystal fiber (3-5-3), a multimode micro-nano fiber (3-5-4) and an FBG (3-5-5) to form an optical fiber composite structure, an air hole of the photonic crystal fiber (3-5-3) is filled with an ethanol chloroform material (3-5-7), and in addition, part of the FBG (3-5-5) is adhered to a GMM material (3-5-6) to form the sensing unit (3-5);the specific preparation process of the sensing units (3-5) comprises the steps of manufacturing an optical fiber composite structure and coating a sensitive material;wherein: the manufacturing of the optical fiber composite structure comprises the manufacturing of an optical fiber package (3-5-2) at the right end of a single mode optical fiber (3-5-1), the manufacturing of a photonic crystal optical fiber (3-5-3) filled with an ethanol chloroform material (3-5-7), the manufacturing of a multimode micro-nano optical fiber (3-5-4), and the manufacturing of a cascade structure of the single mode optical fiber (3-5-1) -the photonic crystal optical fiber (3-5-3) -the multimode micro-nano optical fiber (3-5-4) -FBG (3-5-5); firstly, preparing a single-mode optical fiber (3-5-1) right-end optical fiber package (3-5-2): intercepting a section of single-mode optical fiber (3-5-1) with the length of 5mm, placing the single-mode optical fiber (3-5-1) on a fusion splicer, and completing the preparation of an optical fiber package (3-5-2) structure by utilizing a spherical mode of the fusion splicer; preparation of Photonic Crystal fiber (3-5-3): cutting a section of photonic crystal fiber (3-5-3) with the length of 25mm, connecting a pinhole with one end of the photonic crystal fiber (3-5-3) by adopting an injector filled with prepared ethanol chloroform material (3-5-7), sealing the fiber and the pinhole by using molten paraffin, and slowly pushing the ethanol chloroform material (3-5-7) in the injector into the photonic crystal fiber (3-5-3) after the paraffin is cooled; preparing multimode micro-nano optical fibers (3-5-4): taking a section of multimode optical fiber with the length of 3mm, and tapering the multimode optical fiber into a micro-nano structure; the multimode micro-nano optical fiber (3-5-4), the photonic crystal fiber (3-5-3) in front and the optical fiber package (3-5-2) form a Mach-Zehnder interferometer, finally, the multimode micro-nano optical fiber (3-5-3) and the multimode micro-nano optical fiber (3-5-4) containing the optical fiber package (3-5-2) are sequentially welded from left to right by the three parts with the cut and smooth end faces to form a temperature sensing unit, and finally, the temperature sensing unit is welded with the FBG (3-5-5) with the grating area length of 20mm and the central wavelength of 1550nm by an optical fiber welding machine to form an optical fiber composite structure, wherein the outer diameters of all the optical fibers are the same;the coating of the sensitive material mainly comprises the coating of a GMM material (3-5-6), wherein the grid region part of the FBG (3-5-5) in the dried composite structure is stuck to the surface of the GMM material (3-5-6) by adopting an epoxy resin material and stands for 48 hours;the photonic crystal fiber (3-5-3) is filled with an ethanol chloroform material (3-5-7), and the preparation method of the ethanol chloroform material (3-5-7) comprises the following steps: 1:1 mixing the prepared ethanol and chloroform, and uniformly stirring, wherein the temperature of the ethanol is 78 ℃, and the temperature of the chloroform is 61 ℃, so that the measurement of the sensor is carried out in an environment below 60 ℃;the FBG cascade optical fiber composite structure temperature-sensitive magnetic field eliminating sensing device is characterized in that:a BBS light source (1) emits a light beam to be transmitted to a circulator (2), the circulator (2) outputs the light beam to be transmitted to a sensing unit (3-5) in a double-parameter measuring system (3), the light beam generates interference in the sensing unit (3-5), when the light beam is transmitted to an optical fiber package (3-5-2) through a single-mode optical fiber (3-5-1), the optical fiber package (3-5-2) with a coupling effect enables a part of the light in a fiber core to enter a cladding, the light passes through the optical fiber package (3-5-2) and is conducted along an ethanol chloroform material (3-5-7) filled in the fiber core, the other part of the light is conducted along the fiber core of a photonic crystal optical fiber (3-5-3), and when the two parts of light are transmitted to a multimode micro-nano optical fiber (3-5-4), the light is coupled to generate Mach interference, when the temperature changes, the refractive index of the ethanol chloroform material (3-5-7) in the photonic crystal fiber (3-5-3) changes due to the temperature change, the optical path of light transmitted along the ethanol chloroform material (3-5-7) changes, the interference light changes, when a magnetic field in the double-parameter measurement system (3) changes, the GMM material (3-5-6) stretches due to the magnetostrictive effect, the grating pitch of the FBG (3-5-5) adhered to the GMM material (3-5-6) changes, interference light changes, the interference light transmits a reflection spectrum to the OSA (4) through the circulator (2) to display an interference spectrum, and the demodulation module (5) demodulates the OSA (4) and transmits the demodulation to the computer (6) to perform data processing so as to eliminate the influence of temperature on magnetic field measurement.
- 2. The temperature-sensitive magnetic field sensing device for eliminating FBG cascade optical fiber composite structure as claimed in claim 1, wherein:the BBS light source (1) is a broadband light source, and the central wavelength is 1550nm for generating light signals.
- 3. The temperature-sensitive magnetic field sensing device for eliminating FBG cascade optical fiber composite structure as claimed in claim 1, wherein:when the double-parameter measuring system (3) measures the temperature, the heating table (3-4) is started, and the sensing unit (3-5) is placed on the heating table (3-4) to realize the measurement of the temperature sensitivity of the composite structure; and when measuring the magnetic field, the resistance box A (3-2) on the horizontal table A (3-1) is operated to change the magnetic field generated by the electrified solenoid A (3-3) so as to realize the measurement of the magnetic field, and finally, the influence generated by the temperature when measuring the magnetic field is eliminated by utilizing the analysis matrix method according to the tested temperature sensitivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447946.9A CN114137446B (en) | 2021-11-30 | 2021-11-30 | Temperature-sensitive magnetic field eliminating sensing device of FBG cascade optical fiber composite structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447946.9A CN114137446B (en) | 2021-11-30 | 2021-11-30 | Temperature-sensitive magnetic field eliminating sensing device of FBG cascade optical fiber composite structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114137446A true CN114137446A (en) | 2022-03-04 |
| CN114137446B CN114137446B (en) | 2023-12-22 |
Family
ID=80386227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111447946.9A Active CN114137446B (en) | 2021-11-30 | 2021-11-30 | Temperature-sensitive magnetic field eliminating sensing device of FBG cascade optical fiber composite structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114137446B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115931021A (en) * | 2022-12-19 | 2023-04-07 | 北京大学长三角光电科学研究院 | Optical fiber sensor, preparation method thereof and sensing device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040263950A1 (en) * | 2003-06-03 | 2004-12-30 | Imra America, Inc. | In-line, high energy fiber chirped pulse amplification system |
| CN102221679A (en) * | 2011-04-25 | 2011-10-19 | 东北大学 | Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor |
| CN104020424A (en) * | 2014-05-28 | 2014-09-03 | 江苏金迪电子科技有限公司 | All-fiber magnetic field sensor |
| CN204945215U (en) * | 2015-03-13 | 2016-01-06 | 张�浩 | Cable current sensor, cable current measuring system and cable |
| CN111012356A (en) * | 2019-11-26 | 2020-04-17 | 武汉纺织大学 | Gait detection and identification system and method based on micro-nano optical fiber composite sensing |
-
2021
- 2021-11-30 CN CN202111447946.9A patent/CN114137446B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040263950A1 (en) * | 2003-06-03 | 2004-12-30 | Imra America, Inc. | In-line, high energy fiber chirped pulse amplification system |
| CN102221679A (en) * | 2011-04-25 | 2011-10-19 | 东北大学 | Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor |
| CN104020424A (en) * | 2014-05-28 | 2014-09-03 | 江苏金迪电子科技有限公司 | All-fiber magnetic field sensor |
| CN204945215U (en) * | 2015-03-13 | 2016-01-06 | 张�浩 | Cable current sensor, cable current measuring system and cable |
| CN111012356A (en) * | 2019-11-26 | 2020-04-17 | 武汉纺织大学 | Gait detection and identification system and method based on micro-nano optical fiber composite sensing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115931021A (en) * | 2022-12-19 | 2023-04-07 | 北京大学长三角光电科学研究院 | Optical fiber sensor, preparation method thereof and sensing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114137446B (en) | 2023-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100437036C (en) | Fibre optic sensor for measuring temperature and refractive index of liquid contemporarily | |
| CN100529735C (en) | Temperature and solidification rate real-time monitoring device for polymer based composite material forming process | |
| CN101598773B (en) | Magnetic induction intensity sensing head and magnetic induction intensity measurement method and device thereof | |
| CN100593727C (en) | Apparatus based on magnetofluid refraction index changing and detecting magnetic variation | |
| CN103674117B (en) | Measure entirely method and device with weak optical fiber Bragg grating temperature and strain based on Raman scattering simultaneously | |
| CN100367016C (en) | Fibre-optical temperature measuring device and measurement thereof | |
| CN108332876B (en) | Optical fiber temperature sensor | |
| CN103591971B (en) | A kind of localization method of fiber grating | |
| CN110987230B (en) | Double-parameter optical fiber sensing module and system | |
| CN114137273B (en) | Temperature-sensitive current eliminating sensing device of FBG cascade optical fiber composite structure | |
| CN106802190B (en) | A kind of optic fibre turning sensor of highly sensitive no Temperature cross-over interference | |
| CN206161192U (en) | Interference type optical fiber temperature sensor based on capillary glass tube encapsulation | |
| CN204613104U (en) | A kind of light fibre humidity transducer based on dislocation welding | |
| CN205655942U (en) | Meet an emergency and optical fiber sensor of temperature simultaneous measurement | |
| CN105371785B (en) | A kind of curvature measurement method | |
| CN204718708U (en) | A kind of sensor simultaneously measured with strain based on temperature that is spherical and thin-core fibers | |
| CN102221421A (en) | Distributed optical fiber sensor for temperature and strain measurement and measuring method | |
| CN204881905U (en) | Temperature sensor of spherical structure optic fibre | |
| CN109709499B (en) | Probe type vector magnetic field sensor based on fiber bragg grating and manufacturing method thereof | |
| CN114137446B (en) | Temperature-sensitive magnetic field eliminating sensing device of FBG cascade optical fiber composite structure | |
| CN109580037A (en) | Temperature sensor and preparation method thereof based on photonic crystal fiber FP structure | |
| CN101710065A (en) | Thin core optical fiber mode interferometer sensor | |
| CN110044441A (en) | A kind of plastic optical fiber liquid level sensor of more tooth type structures and preparation method thereof | |
| CN205785514U (en) | A kind of all-fiber power measuring system for high-capacity optical fiber laser | |
| Zhu et al. | High sensitivity temperature and curvature sensor based on Mach-Zehnder interferometer with tapered two peanut-shaped structures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |