CN201251594Y - Long distance non-contact current monitoring system and sensing probe thereof - Google Patents
Long distance non-contact current monitoring system and sensing probe thereof Download PDFInfo
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- CN201251594Y CN201251594Y CNU2008200719414U CN200820071941U CN201251594Y CN 201251594 Y CN201251594 Y CN 201251594Y CN U2008200719414 U CNU2008200719414 U CN U2008200719414U CN 200820071941 U CN200820071941 U CN 200820071941U CN 201251594 Y CN201251594 Y CN 201251594Y
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Abstract
The utility model discloses a long distance non-contact current monitoring system and a sensing probe thereof, for overcoming the problems of prior art such as the limitation on short distance monitor and low accuracy. The technical scheme is that the long distance non-contact current monitoring system adds a second optical coupler, a transmission optical fiber, a sensing probe, a photoelectric detector, a low noise amplifying circuit, an A/D converter circuit, a control circuit and a computer on a prior art, wherein the 1% port of the second optical coupler is connected with the optical fiber at the output end of a third optical isolator, the 99% port of the second optical coupler is connected with the optical fiber at the input end of the photoelectric detector, the public port of the second optical coupler is connected with the optical fiber at one end of the transmission optical fiber, the another end of the transmission optical fiber is connected with the optical fiber at the tail of an optical fiber grate in the sensing probe, the photoelectric detector, the low noise amplifying circuit, the A/D converter circuit, the control circuit and the computer are connected via wires in turn, the control circuit is connected with a dielectric film interference filter via wires, and the sensing probe is based on optical fiber grate.
Description
Technical field
The utility model relates to a kind of current monitoring system, and more particularly, it relates to a kind of distributed length based on fiber grating apart from the non-contact type current monitoring system.
Background technology
Over nearly 10 years, (Fiber Bragg Grating, FBG) sensing technology has become the highest, strong, the most great-hearted sensing technology of practicality of reliability in the Fibre Optical Sensor to Fiber Bragg Grating FBG.Fiber grating is that optical fiber passes through UV-irradiation, the heart body Bragg grating that makes the variation of fiber core refractive index generating period and form, the narrow linewidth light wave that satisfies Bragg condition in the broadband light to incident will produce reflection, this reflection is relatively more responsive to strain and temperature two physical quantitys, by detecting the variation of the centre wavelength in the FBG reflectance spectrum, realize obtaining to measurand information.The Terfenol-D rare earth alloy is that (GiantMagneto st rictive Material, GMM), magnetostrictive effect is higher tens times than traditional magnetostriction materials, and has characteristics such as reliability height, response band be wide for novel giant magnetostrictive material.FBG is pasted on the GMM rod, and with it magnetic field that places current in wire to produce, in the magnetic field that electric current produces, produce strain by the FBG perception by GMM, and then can predict the magnitude of current by spectrum demodulating system demodulation wavelength variable quantity, advantages such as the GMM magnetostriction coefficient is big, the FBG sensing is reliable can be rolled into one.Magnetostriction alloy, marmem and piezoelectric ceramics are the critical function materials of used micro-actuator on microrobot.As rare-earth-iron that the giant magnetostrictive material people know be alloy Tb-Fe, Sm-Fe and Terfenol-D etc. are arranged.
In the optical fiber optical grating multiplexing sensor-based system, mostly adopt wideband light source, its output peak power be generally-25dBm about, power in the total transmission line of coupled into optical fibres is by several welded joints, connector, coupling mechanism and wavelength division multiplexer etc. are assigned in each passage of whole network, each element in the system, comprise sensor itself, all absorb or the scattering certain power, its size is generally 0.1 decibel to several decibels, if optical fiber is bent or the joint quality of connection is relatively poor, can produce and reach several decibels loss, thereby the number of multiplexing sensing grating can not be too many, the signal to noise ratio (S/N ratio) of Jian Ceing is lower simultaneously, has also just increased the demodulation process difficulty of signal.If adopt tunable fiber laser as light source, then can improve significantly peak power (peak power of the tunable optical fiber laser that experiment is adopted for-0.9dBm), the signal to noise ratio (S/N ratio) of detection will increase significantly.Wavelength-division multiplex technique is subjected to the light source bandwidth constraints, and its multiplexing number is limited.Under the prerequisite of identical light source bandwidth, if adopt the light source of tunable narrow cable and wide optical fiber laser as sensor-based system, on the basis of wavelength-division multiplex, adopt the time division multiplex sensing technology simultaneously, will enlarge multiplexing raster count effectively, and more effectively improve the scope that the array sensing multiple spot detects.And have characteristics such as economic and practical, signal to noise ratio (S/N ratio) height, the sensing network that detects for multiple spot has bigger practical value.
Summary of the invention
Technical problem to be solved in the utility model be overcome fiber Bragg grating current sensor that prior art exists can only short distance monitoring and the lower problem of precision, provide the higher length of a kind of that can realize long distance monitoring and precision apart from the non-contact type current monitoring system.Also provide a kind of length that is applied in apart from the sensing probe in the non-contact type current monitoring system simultaneously.
For solving the problems of the technologies described above, the utility model has adopted following technical scheme to realize: described length includes pumping source, wavelength division multiplexer, Er-doped fiber, first optoisolator, first photo-coupler, dielectric film interference filter, second optoisolator and the 3rd optoisolator apart from the non-contact type current monitoring system.The output terminal of pumping source is connected with the 980nm fiber port of wavelength division multiplexer, the public port of wavelength division multiplexer is connected with an end optical fiber of Er-doped fiber, the other end of Er-doped fiber is connected with the input end fiber of first optoisolator, the output terminal of first optoisolator is connected with the common port optical fiber of first photo-coupler, 80% port of first photo-coupler is connected with the input end fiber of the 3rd optoisolator, 20% port of the first smooth photo-coupler is connected with the input end fiber of dielectric film interference filter, the output terminal of dielectric film interference filter is connected with the input end fiber of second optoisolator, and the output terminal of second optoisolator is connected with the 1550nm fiber port of wavelength division multiplexer.On this basis, this length also is equipped with second photo-coupler, Transmission Fibers, sensing probe, photodetector, low noise amplifier circuit, A/D change-over circuit, control circuit and computing machine apart from the non-contact type current monitoring system.
1% port of second photo-coupler is connected with the output terminal optical fiber of the 3rd optoisolator, 99% port of second photo-coupler is connected with the input end fiber of photodetector, the public port of second photo-coupler is connected with an end optical fiber of Transmission Fibers, and the other end of Transmission Fibers is connected with the tail optical fiber optical fiber of fiber grating in the sensing probe.The output terminal of photodetector is connected with the input end electric wire of low noise amplifier circuit, the output terminal of low noise amplifier circuit is connected with the input end electric wire of A/D change-over circuit, the output terminal of A/D change-over circuit is connected with the input end electric wire of control circuit, the output terminal of control circuit is connected with the input end and computer electric wire, is that electric wire is connected between control circuit and the dielectric film interference filter.
Pumping source described in the technical scheme is to provide the pumping source of the pump light of 980nm by wavelength division multiplexer for fiber laser, and wavelength division multiplexer is that structure is the wavelength division multiplexer of 980nm/1550nm, and first photo-coupler is that splitting ratio is the photo-coupler of 80:20; Described second photo-coupler is that splitting ratio is the photo-coupler of 99:1, and first optoisolator, second optoisolator are the identical optoisolators of structure with the 3rd optoisolator;
For solving the problems of the technologies described above, the sensing probe that the utility model provides has adopted following technical scheme to realize: described sensing probe includes tail optical fiber, fiber grating, bar magnet, substrate, first magnetic conduction heel piece, second magnetic conduction heel piece, first axostylus axostyle, second axostylus axostyle and circuit interface.
Be wound with inductive coil respectively on first axostylus axostyle and second axostylus axostyle, first magnetic conduction heel piece is nested with the left end at first axostylus axostyle and second axostylus axostyle, and second magnetic conduction heel piece is nested with at first axostylus axostyle and becomes rectangular frame with the right-hand member of second axostylus axostyle; Among rectangular frame, place a bar magnet as bias magnetic field, substrate one end is fixed on the inboard of first magnetic conduction heel piece, the other end of substrate is in free state, fiber grating is fixed on the stiff end of substrate with alite paste, the tail optical fiber of fiber grating exceeds the outside of first magnetic conduction heel piece and second magnetic conduction heel piece, whole rectangular frame together installs in a housing cylindraceous together with being installed in its parts that neutralize on it, two ends tail optical fiber along the fiber grating of housing axis arranged stretches out from the two ends of cylinder shell, circuit interface is fixed on an end of cylinder shell, two interfaces of circuit interface one end are connected with induction coil wound electric wire on second axostylus axostyle with first axostylus axostyle respectively, and two interfaces of the circuit interface other end are connected with the carrier electric wire that is loaded with tested electric current.
Sm-Fe film three parts of the 1 μ m that substrate described in the technical scheme is made by the Tb-Dy-Fe film of the thick 1 μ m that is the polyimide base film of 7.5 μ m, obtains by radio-frequency magnetron sputter method with the DC magnetron sputtering method are formed.The Sm-Fe divided thin film of the Tb-Dy-Fe film of 1 μ m and 1 μ m places the both sides of the polyimide base film of 7.5 μ m to become to combine closely; It is described that fiber grating is fixed on the alite paste that is adopted on the stiff end of substrate is the M-bond600 type alite paste that can almost pass to distortion fiber grating when the material deformation in time fully.
Compared with prior art the beneficial effects of the utility model are:
1. the length based on fiber grating can realize the current measurement of long distance apart from the non-contact type current monitoring system by adopting high performance tunable narrow cable and wide optical fiber laser as light source.
2. the length based on fiber grating can realize the distributed current measurement of WDM+TDM multiple spot apart from the non-contact type current monitoring system by adopting wavelength-division and time-division multiplex technology.
3. the length based on fiber grating can realize the current with high accuracy measurement apart from the non-contact type current monitoring system by the sensing probe based on fiber grating that adopts the utility model design.
4. the length based on fiber grating has reduced cost of manufacture apart from the non-contact type current monitoring system by adopting the distributed current measurement of WDM+TDM multiple spot.
5. the length based on fiber grating has realized contactless current measurement apart from the non-contact type current monitoring system, can be widely used in the measurement of big electric current.
6. come deal with data to show the size of current measured apart from the non-contact type current monitoring system by computing machine based on the length of fiber grating, can realize remote current monitoring.
7. adopt the semi-girder tuning structure based on the length of fiber grating apart from the non-contact type current monitoring system, have that tuning range is wide, advantages such as linear response degree height, temperature-insensitive, reusability are good, simple in structure, distortion degree of warbling more, more easy to control.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described:
Fig. 1 is based on the length of fiber grating and forms the structural representation block diagram apart from the non-contact type current monitoring system;
Fig. 2 a is based on the composition structural representation of the length of fiber grating apart from the sensing probe that is adopted in the non-contact type current monitoring system;
Fig. 2 b is based on the structural representation of the length of fiber grating apart from the substrate that sensing probe adopted in the non-contact type current monitoring system;
Fig. 3 is based on the fluorescence spectrum figure of the length of fiber grating apart from the Er-doped fiber gain media that is adopted in the non-contact type current monitoring system;
Fig. 4 is based on the length of fiber grating apart from the fiber laser output power that is adopted in the non-contact type current monitoring system and the graph of a relation of pump power;
The laser output spectrum figure of the length that Fig. 5 is based on fiber grating when not adding 21km optical fiber in the non-contact type current monitoring system;
The length that Fig. 6 is based on fiber grating is apart from the laser output spectrum figure that has added in the non-contact type current monitoring system behind the 21km optical fiber;
Among the figure: 1. pumping source, 2. wavelength division multiplexer, 3. Er-doped fiber, 4. first optoisolator, 5. first photo-coupler, 6. dielectric film interference filter, 7. second optoisolator, 8. the 3rd optoisolator, 9. second photo-coupler, 10. Transmission Fibers, 11. sensing probes, 12. photodetectors, 13. low noise amplifier, 14.A/D change-over circuit, 15. control circuits, 16. computing machine, 17. tail optical fibers, 18. fiber gratings, 19. bar magnet, 20. substrates, 21. first magnetic conduction heel pieces, 22. second magnetic conduction heel piece, 23.Tb-Dy-Fe film, 24. polyimide base films, 25.Sm-Fe film, 26. first axostylus axostyle, 27. second axostylus axostyles, 28. circuit interfaces.
Embodiment
Below in conjunction with accompanying drawing the utility model is explained in detail:
The utility model proposes the action of a magnetic field that utilizes the transmission of electricity bus in the strain of the magnetostrictive effect that FBG-GMM-Sm-Fe produced by the FBG perception, thereby measure the electric current of bus, this method has realized non-access measurement, and be not subjected to environmental interference and influence, have great stability and higher precision; The utility model proposes the fixedly employing semi-girder tuning structure of fiber grating 18, adopt that the semi-girder mechanical tuning device has that tuning range is wide, advantages such as linear response degree height, temperature-insensitive, reusability are good, simple in structure, distortion degree of warbling more, more easy to control.
Based on high performance tunable narrow cable and wide optical fiber laser, a kind of wavelength detection scheme of program control tuning scanning has been proposed, with narrow cable and wide optical fiber laser as light source, Fiber Bragg Grating FBG and Tb-Dy-Fe and Sm-Fe combine and consist of ultra-magnetic telescopic current sense probe, utilize Tb-Dy-Fe and the Sm-Fe flexible change that causes bragg wavelength under magnetic field, realized program control tuning scanner uni signal Processing, measured the size of the electric current to be measured that produces magnetic field with this based on high performance tunable narrow cable and wide optical fiber laser; This method signal to noise ratio (S/N ratio) height, demodulation principle be simple, be provided with flexibly, reliability is high.Adopt dielectric film interference filter 6 to carry out the wavelength programming Control in the scheme, have good temperature stability, and tuning convenience, tuned speed is fast and tuning range is big; The Er-doped fiber of employing high-dopant concentration has shortened the length of doped fiber effectively, has dwindled physical dimension greatly, has improved stability of light source and output characteristics.
The utility model also proposes to utilize high power, low noise narrow line width regulatable er-doped (Er
3+) doped fiber ring laser substituted traditional ASE (amplified spontaneous emission) wideband light source, constituted Distributed Multi fiber Bragg grating current sensor-based system by a plurality of current sensor probes 11 based on fiber grating, realized the distributed sensing of 21km, promptly the data of all nodes of need monitoring being sent to central microcomputer by fiber optic network can monitor in real time.
The sensing probe that design has realized being made up of giant magnetostrictive material, fiber laser, Bragg grating, embedded scm etc. are formed fiber Bragg grating current sensing experiment system, employing narrow line width regulatable er-doped (Er
3+) doped fiber ring laser then can obtain the wavelength tuning range of 40nm, and light intensity is very strong, adopts wavelength-division and time-division multiplex technology simultaneously, carries out the distributed WDM+TDM sensing experiment of multiple spot.The scanning wavelength of laser is divided into different time slots, and each sensing point branch has a time slot, utilizes the little characteristics of optical fiber grating sensing probe wavelength variations, and each sensor probe branch has a wavelength, carries out WDM, thereby realizes the distributed measurement of WDM+TDM multiple spot.
Consult Fig. 5 and accompanying drawing 6, designed distributed length based on fiber grating apart from the non-contact type current monitoring system.Light signal is through after the transmission of 21km, and the energy of signal has had certain decay, and three dB bandwidth does not have significant change, illustrates that signal does not distort in the transmission course, and still has signal to noise ratio (S/N ratio) preferably.After power meter is measured, learn, the luminous power that front and back are twice be respectively 9.79dBm and-1.30dBm.Hence one can see that, optical fiber decay to 11.09dB.
In experiment, record, laser instrument peak value output greater than-9.30dBm the time, sensor-based system can be under the situation of high s/n ratio operate as normal.Light signal is through after the Optical Fiber Transmission of 21km, and peak value is-6.95dBm that power is for meeting the requirement of operate as normal fully.Therefore light signal can be realized the remote sensing effect of 21km through opto-electronic conversion, amplification, A/D after changing fully.
That the utility model adopts is high power, low noise narrow line width regulatable er-doped (Er
3+) doped fiber ring laser.This fiber laser adopts the 980nm high power pump laser to make pumping source, has that power height, threshold value are low, gain bandwidth (GB), the easy stable tuning structure of broad, wavelength is adjustable continuously, easy and simple to handle, steady performance.Adopt the smooth Er-doped fiber of novel gain further to strengthen stability of light source and output characteristics in addition.
Consult Fig. 1, based on the length of fiber grating apart from the non-contact type current monitoring system mainly by pumping source 1, structure is the wavelength division multiplexer 2 of 980/1550nm, Er-doped fiber 3, first optoisolator 4, first photo-coupler 5 of splitting ratio 80:20, dielectric film interference filter 6, second optoisolator 7, the 3rd optoisolator 8, second photo-coupler 9 of splitting ratio 99:1, Transmission Fibers 10, sensing probe 11 based on fiber grating, photodetector 12, low noise amplifier circuit 13, A/D change-over circuit 14, model is that control circuit 15 and the computing machine 16 of 89C52 formed.
The output terminal of pumping source 1 and structure are that the 980nm fiber port of the wavelength division multiplexer 2 of 980/1550nm is connected, structure is that the public port of the wavelength division multiplexer 2 of 980/1550nm is connected with an end optical fiber of Er-doped fiber 3, the other end of Er-doped fiber 3 is connected with the input end fiber of first optoisolator 4, the output terminal of first optoisolator 4 is connected with the common port optical fiber of first photo-coupler 5 of splitting ratio 80:20,80% port of first photo-coupler 5 of splitting ratio 80:20 is connected with the 3rd optoisolator 8 input end fiber, 20% port of first photo-coupler 5 of splitting ratio 80:20 is connected with dielectric film interference filter 6 input end fiber, dielectric film interference filter 6 output terminals are connected with the input end fiber of second optoisolator 7, and the output terminal of second optoisolator 7 and structure are that the 1550nm fiber port of the wavelength division multiplexer 2 of 980/1550nm is connected.The 3rd optoisolator 8 output terminals are connected with 1% fiber port of second photo-coupler 9 of splitting ratio 99:1,99% port of second photo-coupler 9 of splitting ratio 99:1 is connected with photodetector 12 input end fiber, the public port of second photo-coupler 9 of splitting ratio 99:1 links to each other with an end of transmission light 10, and the other end of Transmission Fibers 10 is connected with tail optical fiber 17 optical fiber based on fiber grating 18 in the sensing probe 11 of fiber grating.The output terminal of photodetector 12 is connected with the input end electric wire of low noise amplifier circuit 13, the output terminal of low noise amplifier circuit 13 is connected with the input end electric wire of A/D change-over circuit 14, the output terminal of A/D change-over circuit 14 is connected with the input end electric wire of control circuit 15, the output terminal of control circuit 15 is connected with the input end electric wire of computing machine 16, is that electric wire is connected between control circuit 15 and the dielectric film interference filter 6.
Long principle of work apart from the non-contact type current monitoring system:
Consult Fig. 1, pumping source 1 is to be narrow line width regulatable er-doped (Er
3+) doped fiber ring laser provides the pump laser of the pump light of 980nm, gain medium is the Er-doped fiber 3 that is about 2.33m, Er-doped fiber 3 is about 14.8dB/m in the peak absorbance at 979nm place, its fluorescence spectrum figure as shown in Figure 3, the splitting ratio of first photo-coupler 5 is 80:20.Adopt dielectric film interference filter 6 to carry out wavelength tuning, tuning range can reach 40nm, is undertaken tuningly by computing machine 16 programming Control dielectric film interference filters 6, realizes the able to programme tuning output of laser on operation wavelength.
The pump light process structure of the 980nm that pumping source 1 sends is that the wavelength division multiplexer 2 of 980/1550nm enters Er-doped fiber 3, the pump light of 3 couples of 980nm of Er-doped fiber carries out pumping, in Er-doped fiber 3, form population inversion, and ASE appears, radiant light is through first photo-coupler 5 of splitting ratio 80:20,80% output port of first photo-coupler 5 of splitting ratio 80:20 provides laser output, the laser output that 20% output port of first photo-coupler 5 of splitting ratio 80:20 provides is through dielectric film interference filter 6, leach the laser of required wavelength, through structure is that the wavelength division multiplexer 2 of 980/1550nm enters Er-doped fiber 3, finishes once circulation; The energy of light wave all obtains amplifying in the cyclic process each time, when gaining greater than the loss in the loop, produces vibration, thereby forms narrow line width regulatable er-doped (Er
3+) doped fiber ring laser.Along with the increase gradually of pump power, the mode competition aggravation, noise descends thereupon.The effect of first optoisolator 4 and second optoisolator 7 is respectively from forward and reverse compacting ASE noise, guarantees laser the unidirectional running in ring cavity identical with dielectric film interference filter 6 transmission peak wavelengths, the signal to noise ratio (S/N ratio) of raising laser self.The effect of the 3rd optoisolator 8 is to guarantee that vibration avoids the interference of chamber outer light beam in the chamber, thereby guarantees laser work stability.
The operation wavelength of laser is ITU-T center for standard wavelength 1550.12nm, and three dB bandwidth and 25dB bandwidth are narrower than 0.08nm and 0.22nm, side mode suppression ratio respectively〉60dB.Test is more than 1 hour, and wavelength does not drift about, and wavelength stability is better than 0.01nm, good reproducibility, and spectrum width keeps stable in the process that output power changes, and can satisfy the requirement based on the DWDM all optical communication fully.
Consult Fig. 4, represented among the figure is relation curve between fiber laser output power and the pump power.As seen it has good linear output character.(do not select more high power in order to protect pumping source) when pump power is 150mW, the peak power output that records fiber laser is 38.94mW, and output power stability is better than ± 0.02dB; Threshold pump power is 7.3mW, and slope efficiency reaches 39.75%.Fiber laser has good stability, and in apparatus measures error allowed band, its repeated measuring results does not have significant change.
Second photo-coupler 9, the Transmission Fibers 10 of the laser of 80% port of first photo-coupler 5 of splitting ratio 80:20 output by the 3rd optoisolator 8, splitting ratio 99:1 enters the sensing probe 11 based on fiber grating, the light signal that photodetector 12 will reflect from the sensing probe 11 based on fiber grating is converted into electric signal, again through low noise amplifier circuit 13 after A/D change-over circuit 14 and model are finally to enter computing machine 16 behind the control circuit 15 of 89C52 to show measurement results.Light intensity on the sensing probe 11 is the convolution of fiber grating 18 reflectance spectrums and dielectric film interference filter 6 transmission spectrums, the change curve of photocurrent intensity is the output spectrum curve in the dielectric film interference filter 6 linear tuning process, and the maximum position of curve is the peak wavelength position of fiber grating 18.When changing based on the electric current in the sensing probe 11 of fiber grating, fiber grating 18 peak wavelengths change, the maximum position of photocurrent curve of output also will produce displacement, and the wavelength tuning characteristic of dielectric film interference filter 6 is demarcated by spectrometer in advance, therefore just can avoid using expensive wavelength detecting instrument in actual applications, directly utilize the photocurrent variations curve that records to determine the wavelength shift of fiber grating 18.This wavelength detection method can obtain very high signal to noise ratio (S/N ratio) and measure sensitivity.
Consult Fig. 2 a and Fig. 2 b, sensing probe 11 mainly is made up of with circuit interface 28 tail optical fiber 17, fiber grating 18, bar magnet 19, substrate 20, first magnetic conduction heel piece 21, second magnetic conduction heel piece 22, first axostylus axostyle 26, second axostylus axostyle 27.Wherein, substrate 20 is Sm-Fe film 25 (λ＜0) three parts compositions of the 1 μ m that makes by the Tb-Dy-Fe film 23 of the thick 1 μ m that is polyimide (elastic modulus of this material is little, the thermal stability height) substrate 24 of 7.5 μ m, obtains by electro-plating method (λ〉0) with the DC magnetron sputtering method.The be placed in both sides of polyimide base film 24 of 7.5 μ m of the Sm-Fe film 25 of the Tb-Dy-Fe film 23 of 1 μ m and 1 μ m, the Sm-Fe film 25 of the Tb-Dy-Fe film 23 of 1 μ m and 1 μ m and the polyimide base film 24 of 7.5 μ m are to combine closely.The material that will have direct magnetostriction effect and negative magnetostriction effect combines and can obtain bigger distortion, thereby realizes high-precision measurement.
Be wound with inductive coil respectively on first axostylus axostyle 26 and second axostylus axostyle 27, first magnetic conduction heel piece 21 is nested with the left end at first axostylus axostyle 26 and second axostylus axostyle 27, and second magnetic conduction heel piece 22 is nested with at first axostylus axostyle 26 and becomes rectangular frame with the right-hand member of second axostylus axostyle 27.Among rectangular frame, place a bar magnet 19 as bias magnetic field, substrate 20 1 ends are fixed on the inboard of first magnetic conduction heel piece 21, the other end of substrate 20 is in free state, fiber grating 18 usefulness alite pastes are close on the stiff end that is fixed on the substrate 20 that is coated with magnetostrictive thin film, what described alite paste adopted is the M-bond600 type alite paste that can almost pass to distortion fiber grating when material deformation in time fully, and the tail optical fiber 17 of fiber grating 18 exceeds the outside of first magnetic conduction heel piece 21 and second magnetic conduction heel piece 22.Whole rectangular frame together be installed in its neutralize on it parts together along the axis device in the housing of an oval tubular, and fixed.Two ends tail optical fiber 17 along the fiber grating 18 of housing axis arranged stretches out from the two ends of oval tubular shell, circuit interface 28 is fixed on an end of oval tubular shell, two interfaces of circuit interface 28 1 ends are connected with induction coil wound electric wire on second axostylus axostyle 27 with first axostylus axostyle 26 respectively, and two interfaces of circuit interface 28 other ends are connected with the carrier electric wire that is loaded with tested electric current.Adopting the mechanical tuning device of beam type is in order to obtain higher sensitivity.The mechanical tuning device of beam type has advantages such as tuning range is wide, linear response degree height, temperature-insensitive, reusability is good, simple in structure, distortion is more, wavelength tuning range broad, degree of warbling more easy to control.
Principle of work based on the sensing probe of fiber grating:
The carrier that is loaded with tested electric current is connected by electrical wiring on two circuit interfaces 28, thereby cause that induction coil wound produces magnetic field on first axostylus axostyle 26 and second axostylus axostyle 27, the bias magnetic field one that produces with built-in bar magnet 19 reacts on the substrate 20 that is coated with magnetostrictive thin film, the Tb-Dy-Fe film 23 that produces 1 μ m of direct magnetostriction just extends, and the 1 μ mSm-Fe film 25 that produces negative magnetostriction can shorten, the last stiff end that is coated with the substrate 20 of magnetostrictive thin film just is bent downwardly the generation displacement, thereby cause and be fixed on that fiber grating 18 is bent downwardly on the substrate 20 that is coated with magnetostrictive thin film, make fiber grating 18 produce axial strain, the centre wavelength of fiber grating 18 will change.Fiber grating 18 peak wavelengths change, and the maximum position of photocurrent curve of output also will produce displacement, and the wavelength tuning characteristic of dielectric film interference filter 6 is demarcated by spectrometer in advance, thereby measure the size of electric current to be measured.
Claims (6)
1. one kind long apart from the non-contact type current monitoring system, includes pumping source (1), wavelength division multiplexer (2), Er-doped fiber (3), first optoisolator (4), first photo-coupler (5), dielectric film interference filter (6), second optoisolator (7) and the 3rd optoisolator (8); The output terminal of pumping source (1) is connected with the 980nm fiber port of wavelength division multiplexer (2), the public port of wavelength division multiplexer (2) is connected with an end optical fiber of Er-doped fiber (3), the other end of Er-doped fiber (3) is connected with the input end fiber of first optoisolator (4), the output terminal of first optoisolator (4) is connected with the common port optical fiber of first photo-coupler (5), 80% port of first photo-coupler (5) is connected with the input end fiber of the 3rd optoisolator (8), 20% port of the first smooth photo-coupler (5) is connected with the input end fiber of dielectric film interference filter (6), the output terminal of dielectric film interference filter (6) is connected with the input end fiber of second optoisolator (7), and the output terminal of second optoisolator (7) is connected with the 1550nm fiber port of wavelength division multiplexer (2); It is characterized in that this length also is equipped with second photo-coupler (9), Transmission Fibers (10), sensing probe (11), photodetector (12), low noise amplifier circuit (13), A/D change-over circuit (14), control circuit (15) and computing machine (16) apart from the non-contact type current monitoring system;
1% port of second photo-coupler (9) is connected with the output terminal optical fiber of the 3rd optoisolator (8), 99% port of second photo-coupler (9) is connected with the input end fiber of photodetector (12), the public port of second photo-coupler (9) is connected with an end optical fiber of Transmission Fibers (10), the other end of Transmission Fibers (10) is connected with tail optical fiber (17) optical fiber of fiber grating (18) in the sensing probe (11), the output terminal of photodetector (12) is connected with the input end electric wire of low noise amplifier circuit (13), the output terminal of low noise amplifier circuit (13) is connected with the input end electric wire of A/D change-over circuit (14), the output terminal of A/D change-over circuit (14) is connected with the input end electric wire of control circuit (15), the output terminal of control circuit (15) is connected with the input end electric wire of computing machine (16), is that electric wire is connected between control circuit (15) and the dielectric film interference filter (6).
According to the described length of claim 1 apart from the non-contact type current monitoring system, it is characterized in that described pumping source (1) is the pumping source that the pump light of 980nm is provided for super-fluorescence light source by wavelength division multiplexer (2);
Described wavelength division multiplexer (2) is that structure is the wavelength division multiplexer of 980nm/1550nm.
According to the described length of claim 1 apart from the non-contact type current monitoring system, it is characterized in that described first photo-coupler (5) is that splitting ratio is the photo-coupler of 80:20;
Described second photo-coupler (9) is that splitting ratio is the photo-coupler of 99:1;
Described first optoisolator (4), second optoisolator (7) are the identical optoisolators of structure with the 3rd optoisolator (8).
4. sensing probe, it is characterized in that sensing probe includes tail optical fiber (17), fiber grating (18), bar magnet (19), substrate (20), first magnetic conduction heel piece (21), second magnetic conduction heel piece (22), first axostylus axostyle (26), second axostylus axostyle (27) and circuit interface (28);
On first axostylus axostyle (26) and second axostylus axostyle (27), be wound with inductive coil respectively, first magnetic conduction heel piece (21) is nested with at the left end of first axostylus axostyle (26) with second axostylus axostyle (27), and second magnetic conduction heel piece (22) is nested with at first axostylus axostyle (26) and becomes rectangular frame with the right-hand member of second axostylus axostyle (27); Among rectangular frame, place a bar magnet as bias magnetic field (19), substrate (20) one ends are fixed on the inboard of first magnetic conduction heel piece (21), the other end of substrate (20) is in free state, fiber grating (18) is fixed on the stiff end of substrate (20) with alite paste, the tail optical fiber (17) of fiber grating (18) exceeds the outside of first magnetic conduction heel piece (21) and second magnetic conduction heel piece (22), whole rectangular frame together installs in a housing cylindraceous together with being installed in its parts that neutralize on it, two ends tail optical fiber (17) along the fiber grating (18) of housing axis arranged stretches out from the two ends of cylinder shell, circuit interface (28) is fixed on an end of cylinder shell, two interfaces of circuit interface (28) one ends are gone up the induction coil wound electric wire with first axostylus axostyle (26) and second axostylus axostyle (27) respectively and are connected, and two interfaces of circuit interface (28) other end are connected with the carrier electric wire that is loaded with tested electric current.
5. according to the described sensing probe of claim 4, it is characterized in that, Sm-Fe film (25) three parts of the 1 μ m that described substrate (20) is made by the Tb-Dy-Fe film (23) of the thick 1 μ m that is the polyimide base film (24) of 7.5 μ m, obtains by radio-frequency magnetron sputter method with the DC magnetron sputtering method are formed, and the be placed in both sides of polyimide base film (24) of 7.5 μ m of the Tb-Dy-Fe film (23) of 1 μ m and the Sm-Fe film (25) of 1 μ m become to combine closely.
6. according to the described sensing probe of claim 4, it is characterized in that described fiber grating (18) is fixed on the alite paste that is adopted on the stiff end of substrate (20) is the M-bond600 type alite paste that can almost pass to distortion fiber grating when the material deformation in time fully.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104101371A (en) * | 2014-07-11 | 2014-10-15 | 西安电子科技大学 | Small fully-automatic multistage rapid telescopic link device |
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| CN108152556A (en) * | 2018-01-18 | 2018-06-12 | 吉林大学 | It is passive to encourage the non-contact current sense measuring device of self-power wireless and measuring method |
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| CN109270320A (en) * | 2018-10-31 | 2019-01-25 | 江苏骏龙光电科技股份有限公司 | A kind of fiber grating measuring device can be used for transmission line of electricity |
| CN110058176A (en) * | 2019-04-30 | 2019-07-26 | 华霆（合肥）动力技术有限公司 | Current measuring method, apparatus and system |
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