CN108927314A - A kind of distribution type fiber-optic laser-ultrasound transducing head based on coreless fiber - Google Patents
A kind of distribution type fiber-optic laser-ultrasound transducing head based on coreless fiber Download PDFInfo
- Publication number
- CN108927314A CN108927314A CN201810824788.6A CN201810824788A CN108927314A CN 108927314 A CN108927314 A CN 108927314A CN 201810824788 A CN201810824788 A CN 201810824788A CN 108927314 A CN108927314 A CN 108927314A
- Authority
- CN
- China
- Prior art keywords
- fiber
- coreless
- single mode
- optical fiber
- coreless fiber
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
Abstract
The invention proposes a kind of optical-fiber laser distributed ultrasound transducing head based on coreless fiber constitutes ultrasonic transducer activating system by the way that pulse seed source, high power erbium doped optical fibre light amplifier, high-power fiber optic isolator and energy coupling structure with coreless fiber to be linked in sequence.The ultrasonic transduction device of each energy coupling structure with coreless fiber is as composed by the coreless fiber unit of different length, the specific structure of each unit is single mode optical fiber-coreless fiber-single mode optical fiber, and the laser energy coupling ratio of each coreless fiber unit is determined by the length of coreless fiber.The ultrasonic transducer activating system is by the coupling ratio of each coreless fiber unit according to being sequentially connected with from small to large, and the export single mode optical fiber covering in the energy coupling structure of coreless fiber is removed and fills upper laser light absorbing material, by generating ultrasonic signal with the material of high heat absorption coefficients and high thermoelastic coefficient, the excitation of distributed ultrasound signal equalization formula is realized.
Description
Technical field
The present invention relates to optical-fiber laser ultrasonic excitation field, especially a kind of balanced optical fiber based on coreless fiber swashs
Light multiple spot ultrasonic excitation transducing head.
Background technique
In recent years, the structural health of the critical facilities such as civil buildings, Industrial Engineering, space structure is more and more closed
Note.A series of environmental factor may be to the healthy damaging shadow of these structures such as high temperature, deep-etching and severe crash
It rings.Therefore, for important structure, the health detection of structure and performance monitoring are particularly important, especially in time discovery and
Initial damage structure is repaired, it can be to avoid casualties and economic loss.Non-destructive testing technology is a kind of ideal structural health
Monitoring method will not cause to damage to detection structure, can detect extensive structural damage type.In many non-destructive testing technologies
In, based on the detection method of ultrasonic principle because it has the characteristics that flexibility, material permeability, high sensitivity, detection speed are fast
And it is widely used.
Currently, the ultrasonic transducer based on electricity is widely used, ultrasonic signal passes through piezoelectricity, electromagnetism and capacity effect
And it generates.Wherein, piezoelectric ultrasonic transducer (PZT) is the Typical Representative of electricity ultrasonic transduction device, the big, band with volume
The limited disadvantage of width, it is difficult to meet the needs of current.This year, a kind of scheme of alternative conventional piezoelectric ceramic transducer are to make
With the laser-ultrasound transducing head based on optoacoustic transition effects.All -fiber ultrasonic transduction device has high temperature resistant, corrosion-resistant, high score
The advantages that resolution and electromagnetism interference.It is light-weight since optical fiber is small in size, so that it is more suitable for embedded and integrated use.
However, being all to realize that the ultrasound of single-point type swashs in fiber end face mostly currently based on the ultrasonic transduction device of optical fiber
Hair, small part is proposed completes distributed ultrasonic excitation system on simple optical fiber, has researcher to propose to utilize inclination cloth
The method for " the phantom mould " of glug grating being coupled in fibre cladding realizes (non-patent literature 1: " Study of
distributed fiber-optic laser-ultrasound generation based on ghost-mode of
Tilted fiber Bragg gratings, " Proc.SPIE., 2013,8722,872208.) distributed ultrasonic excitation, but
It is that this mode is unable to complete the ultrasonic excitation of multiple spot simultaneously, the condition of excitation is harsher, need to carry out the matching of wavelength, with
And slant Bragg fiber grating prepares that more complicated, cost performance is low, fibre core energy utilization is incomplete.In addition, this mode
Ultrasound transducer means need expensive tunable pulsed laser light source so that whole ultrasonic transducer system cost
It is increased sharply.
Patent document 1 (Chinese Patent Application No. 201610604595.0) proposes a kind of point based on optical fiber dislocation welding
Cloth optical-fiber laser ultrasonic transducer.Fiber sidewall multiple spot ultrasonic excitation this inwardly, pass through control optical fiber longitudinal direction mistake
The control of position amount realizes multiple spot ultrasonic excitation, solves what slant Bragg fiber grating ultrasonic transducer cannot excite simultaneously
Problem, but this longitudinal magnitude of misalignment sharply reduce the radial and axial mechanical performance of optical fiber, optical fiber becomes very fragile,
It is easily broken off under the effect of external force, and the heat sealing machine control precision that this method uses is not high, it is easy to generation system error,
So that the energy radiation ratio of the ultrasonic transducer of preparation does not reach requirement.
In view of the above-mentioned problems, urgent need can excite simultaneously, mechanical performance is high, laser energy radiation is than control precision
High-performance distributed optical fiber laser-ultrasound high, low in cost, that preparation process is simple, ultrasonic excitation condition is wide in range excites transducing
Device is able to carry out large-scale production and embedded use.
Summary of the invention
In view of the deficiencies in the prior art or insufficient, the invention proposes a kind of multiple spots based on coreless fiber structure
The ultrasonic transducer of excitation also improves the preparation for preparing ultrasonic transducer while improving ultrasonic transducer number simultaneously
Efficiency further enhances the mechanical performance of single ultrasonic transducer so that its have in actual Embedded Application it is higher
Robustness.
To achieve the goals above, the technical scheme adopted by the invention is as follows providing a kind of balanced point based on coreless fiber
Cloth optical-fiber laser ultrasonic transducer, by the way that pulse seed source, high power erbium doped optical fibre light amplifier, high-power fiber to be isolated
Device and energy irradiation structure group with coreless fiber are sequentially connected composition distribution type fiber-optic laser-ultrasound energy converting system；Its
In, the energy irradiation structure group packet with coreless fiber expand several by different length coreless fiber covering mode excitation
Unit, the specific structure of each unit are single mode optical fiber-coreless fiber-single mode optical fiber, several described covering mode excitation lists
Member is sequentially connected with from short to long according to the length of coreless fiber part.
As a further improvement of the present invention, the covering mode excitation unit includes importing single mode optical fiber, coreless fiber, leading
Single mode optical fiber and optoacoustic transition material 204 out；Its course of work is that incident basic mode light beam passes in importing single mode optical fiber
It is defeated, various higher order modes are inspired when reaching coreless fiber, guided mode is formed when then into export single mode optical fiber and is transferred to light
At sound transition material, cladding mode is for generating ultrasonic signal, and the core model transmitted in fibre core continues to transmit directly in fibre core
To next ultrasonic excitation point.
As a further improvement of the present invention, the acousto-optic conversion material includes composite material and metal material；It is described multiple
Condensation material includes gold nano grain-polydimethylsiloxanemixture mixture, graphite-epoxy mixture, carbon nano-fiber-poly- two
Methyl siloxane blend or carbon nanotube-polydimethylsiloxanemixture mixture；Metal material includes chromium, steel, gold, gold nano
Particle or titanium-aluminium alloy.
As a further improvement of the present invention, the preparation of the covering mode excitation unit includes the painting at export single mode optical fiber
The removal of coating, the corrosion of covering and the coating of ultrasonic excitation material, wherein ultrasonic excitation material absorbs cladding mode energy volume production
Raw ultrasonic signal.
As a further improvement of the present invention, using coreless fiber and the characteristics of single mode optical fiber mode mismatch and centreless light
The characteristic of fine cladding mode Energy distribution prepares the ultrasonic transduction unit of different laser energy coupling ratio；It is mixed when by high power
When the pulse laser of erbium optical fiber laser amplifier amplification is reached at coreless fiber unit, cladding mode is excited, and enters and lead
When single mode optical fiber out, a part of laser energy, which continues to stay in fibre core and is transmitted as the ultrasonic excitation point in downstream, provides energy, another
Portion of energy is changed into cladding mode, transmits the ultrasound transfer material being coated after a distance and absorbs for ultrasonic excitation.
As a further improvement of the present invention, the preparation flow of single covering mode excitation unit are as follows: (1) is by centreless light first
Fine then (2) cut next section of coreless fiber with hollow-core fiber welding, then (3) by the coreless fiber and single mode optical fiber after cleavage
It is welded together, then (4) accurately cut the centreless of lower certain length using mechanical micro-displacement platform and high magnification microscope equipment
Optical fiber, last (5) are by the coreless fiber of this one end and single mode optical fiber welding.
The beneficial effects of the present invention are: the advantage of ultrasonic transducer of the invention is: (1) accessing coreless fiber can lead to
The laser energy radiation ratio in the length control arrival export single mode optical fiber for changing coreless fiber is crossed, controls the point to play
The effect of the amplitude regulation of laser-ultrasound reaches the controllability requirement of the single ultrasonic excitation device in multiple spot ultrasonic system.(2) lead to
Coreless fiber length short enough can be obtained by crossing accurate mechanical-assisted micro-displacement platform and high magnification optical microscopy, and
And the length of coreless fiber can further be controlled by end-face grinding machine, play the role of multiple control, it can
Integrated ultrasonic excitation points are also enough.(3) cladding diameter of coreless fiber and the diameter of single mode optical fiber are identical, maintain super
The higher mechanical performance of sonic transducer.(4) access procedure of coreless fiber and the fusion process of single mode optical fiber are identical, the work of preparation
Skill is fairly simple, can widely use in actual product.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the distribution type fiber-optic laser-ultrasound transducing head of the invention based on coreless fiber；
Fig. 2 is single mode-centreless-single mode optical fiber structural unit structural schematic diagram of the invention；
Fig. 3 is ultrasonic excitation unit preparation flow figure of the invention；
Fig. 4 is corrosion device figure；
Fig. 5 is the relational graph of coreless fiber length Yu laser energy amount of radiation ratio；
Fig. 6 is coreless fiber irradiation structure figure；
The Experimental equipment using distribution type fiber-optic laser-ultrasound transducing head of the invention that Fig. 7 is；
Fig. 8 is the comparison diagram of ultrasonic transducer corrosion front and back；
Fig. 9 is ultrasonic transducer unit pictorial diagram；
Figure 10 (a) is the output spectrum of light-pulse generator；
Figure 10 (b) is the signal output waveform figure of light-pulse generator；
Figure 10 (c) is stimulation effect schematic diagram；
Figure 10 (d) is the ultrasonic signal waveform diagram of SNS structure excitation；
Figure 11 (a) is single mode-centreless-single mode optical fiber structure string time domain waveform of unit 1；
Figure 11 (b) is single mode-centreless-single mode optical fiber structure string time domain waveform of unit 2；
Figure 11 (c) is single mode-centreless-single mode optical fiber structure string time domain waveform of unit 3；
Figure 11 (d) is single mode-centreless-single mode optical fiber structure string time domain waveform of unit 4；
Figure 11 (e) is single mode-centreless-single mode optical fiber structure string time domain waveform of unit 5；
Figure 11 (f) is single mode-centreless-single mode optical fiber structure string frequency domain spectra of unit 1；
Figure 11 (g) is single mode-centreless-single mode optical fiber structure string frequency domain spectra of unit 2；
Figure 11 (h) is single mode-centreless-single mode optical fiber structure string frequency domain spectra of unit 3；
Figure 11 (i) is single mode-centreless-single mode optical fiber structure string frequency domain spectra of unit 4；
Figure 11 (j) is single mode-centreless-single mode optical fiber structure string frequency domain spectra of unit 5；
Specific embodiment
The present invention is further described for explanation and specific embodiment with reference to the accompanying drawing.
Core of the invention mechanism is: mode mismatch between coreless fiber and single mode optical fiber is utilized, so that importing single-mode optics
When fine optical transport is to coreless fiber, the condition of single mode transport is broken, and various high-order cladding modes are excited out, into export
The laser energy of single mode optical fiber is determined by the length of coreless fiber, and the higher order mode in export fibre cladding, due to
The covering of export optical fiber is improved laser energy utilizing rate by partial corrosion, and applies and apply ultrasound-laser transition material, is wrapping
Laser energy in layer is absorbed by material and is converted to heat, and since material has certain thermal expansion coefficient, material can be heated
Expansion, when the pulsed laser light source used, the generation of this heat was modulated by the interval time of pulse, was reached in pulse
Gap, material can shrink because of the disappearance of heat, and this dilation process just produces ultrasonic signal, and this signal
It is to be modulated by pulsed laser light source, the amplitude of signal is controlled by the energy radiation ratio and corrosion depth of ultrasonic excitation point
's.
As shown in Figure 1, the device of the distribution type fiber-optic laser-ultrasound energy converter of the invention based on coreless fiber mainly by
Pulse seed source 101, high power erbium doped optical fibre light amplifier 102, high-power fiber optic isolator 103 and single mode-centreless-single mode
Optical fiber structure string (also referred to as energy irradiation structure) 104 is sequentially connected composition.Wherein, single mode-centreless-single mode optical fiber structure string 104
It is to be connected by a series of ultrasonic excitation unit (also referred to as covering mode excitation unit) 105 of different coreless fiber length by single mode optical fiber
Connect composition.Ultrasonic excitation unit 105 is by connecting in optical path the length of coreless fiber part from length is short to, so that entire super
Each ultrasonic excitation point of sound activating system obtains balanced laser energy for ultrasonic excitation.
The specific structure of ultrasonic excitation unit 105 as shown in Fig. 2, its mainly by importing single mode optical fiber 201, coreless fiber
202, it exports single mode optical fiber 203 and optoacoustic transition material 204 forms.Its course of work is that incident basic mode light beam 205 is being led
Enter and transmitted in single mode optical fiber 201, inspire various higher order modes 206 when reaching coreless fiber 202, then into export single mode
Guided mode 207 is formed when optical fiber 203 to be transferred at optoacoustic transition material 204, cladding mode for generating ultrasonic signal 209, and
The core model 208 transmitted in fibre core continues to transmit in fibre core until next ultrasonic excitation point.Wherein, acousto-optic conversion material includes
(gold nano grain-polydimethylsiloxanemixture mixture, graphite-epoxy mixture, carbon nano-fiber-polydimethylsiloxanes
Alkane mixture and carbon nanotube-polydimethylsiloxanemixture mixture etc.) composite material and (chromium, steel, gold, gold nano grain with
And titanium-aluminium alloy etc.) metal material.
The preparation flow of ultrasonic excitation unit is as shown in Figure 3, comprising: 1) by the cutting of single mode optical fiber and coreless fiber with
And the welding of molten fine machine, and the structure of the good single mode optical fiber of welding and coreless fiber is fixed on optical fiber micro-displacement platform；2) will
Optical fiber structure after fixation is finely tuned micro-displacement platform, is cut out by optical fiber cutter under the supplementary observation of optical microscopy device
The coreless fiber of appropriate length, and by the optical fiber cut out and derived single mode optical fiber welding；3) by welding it is good have centreless light
The export single mode optical fiber of fine energy coupling structure, which is partially disposed in square groove made of polycarbonate resin material, to be wrapped
Then by the both ends sealing of optical fiber and corrosivity acid solution is isolated with wax in layer corrosion；4) in chemical hood into square groove
The hydrofluoric acid of 40% concentration, 1.15 density is added to flooding optical fiber, the time-triggered protocol of setting fall acid solution and with deionized water it is clear
Wash optical fiber surface；5) optical fiber after corrosion being placed in the slot of notched thin aluminum sheet, aluminium sheet plays fixed optical fiber,
And it will be at optical fiber of a certain amount of ultrasonic excitation material coated in corrosion.Special ultrasonic excitation material needs to be placed in high temperature furnace
In, and specific temperature-curable for a period of time.
Corrosion device in the present invention is as shown in figure 4, its material can be the material of the anti-weak acid corrosion such as plastics, mainly
It is formed including etching tank 401 and two optical fiber holding tanks 402,403, by the way that the single mode-centreless-single mode structure completed will be prepared
Export single mode optical fiber 203 specific position be placed in etching tank 401, and by both ends be respectively placed in optical fiber holding tank 402,
In 403, then with wax sealing is carried out, wax can play the role of fixed optical fiber and prevent acid liquid corrosion other parts optical fiber.This
Acid solution in invention uses the hydrofluoric acid of 40% concentration, 1.15 density.Different etching times can obtain different corrosion
The optical fiber of depth, this can be adjusted flexibly to adapt to optimal application scenarios, and the etching time of optical fiber is 45 points in the present invention
Clock.
Coreless fiber length and the optical fiber of laser energy radiation proportion are as shown in Figure 5 in the present invention.Wherein, with centreless light
The increase of fine length exports in single mode optical fiber, and the energy of covering constantly increases, and the laser energy ratio in fibre core is held
Continuous decline.
Structure typical case's pictorial diagram of fiber section in ultrasonic excitation unit of the invention is as shown in Figure 6.In the present invention
It is 20.17%, 24.46%, 34.86%, 52.21% respectively using five laser energy coupling ratios, 90.10%, which carries out performance, surpasses
Sonic transducer 1~5.Other than direct machine chips control coreless fiber, fiber end face corrosion and optical fiber can also be passed through
Its precision of the mode secondary operation strict control of end surface grinding.
Ultrasonic excitation and ultrasonic detection system of the invention is as shown in Figure 7.It is mainly by high power Erbium-doped fiber amplifier
Device 701, high-power fiber optic isolator 702, ultrasonic action unit 703, piezoelectric ceramics detector 704, electric amplifier 705, oscillography
Device 706 and pulsed laser light source 707 form.Pulsed laser light source 707 issues pulsed light and passes through high power Erbium-doped fiber amplifier
Device 701 amplifies optical power, and amplified pulse laser enters single ultrasonic action list using high-power fiber optic isolator
Member 703 carries out ultrasonic excitation, and high-power fiber optic isolator can prevent the damage from laser high power erbium-doped fiber amplifier of reflection
701 and pulsed laser light source 707.The ultrasonic signal of excitation is detected by supersonic sounding equipment piezoelectric ceramics detector 704, and will
It is transferred to electric amplifier 705 and carries out signal amplification, recently enters the display and analysis that ultrasonic waveform is carried out in oscillograph.
The pictorial diagram of the fiber section in ultrasonic transducer unit after corroding in the present invention is as shown in Figure 8.It mainly divides
To import single mode optical fiber coupling part 801, the transition region 803 of corrosion and corrode export fiber section 802 out.Optoacoustic conversion
Material, which is mainly coated in, to be corroded at gentle export single mode optical fiber part 802, and the optoacoustic transition material used in the present invention is stone
The mixing material of ink and epoxy resin needs to solidify four hours under the conditions of 120 DEG C in high-temperature cabinet after coating.
Ultrasonic transducer unit of the invention is as shown in Figure 9.Its mainly by with reeded support aluminium sheet 901, be coated with
Fiber section 902, piezoelectric ceramics acoustical signal detector 903 and the auxiliary of optoacoustic converting material support device 904 to form.Its
In, the groove of support aluminium sheet 901 is for placing optical fiber and fixed optical fiber.
Used light source characteristic of the invention and parameter such as Figure 10 (a)-Figure 10 (d) are shown.The repetition of pulse laser
Set of frequency is 3kHz, and pulse width was set as 5 nanoseconds.Ultrasonic action source is the light-pulse generator amplified by EDFA, output light
Spectrum is shown by spectrometer, resolution ratio 0.02nm, as shown in Figure 10 (a).From the spectrogram of light source it is found that the center of pulse laser
Wavelength is close to 1550.2nm, three dB bandwidth 0.12nm, and corresponding line width is 1.12nm.The appropriate amplifying power for reducing EDFA, and
Increase certain loss in output end.Then, using the subsequent output signal of photodetector reception amplifier, and oscillography is used
Device shows and records its waveform.Figure 10 (b) shows the pulse width that the signal has 5ns, and its peak swing is close
280mV。
Figure 10 (c), which is shown, has repetition rate identical with light source by the signal of EDFA amplification, and the pulse spacing is about
It is 3.3 milliseconds, and each pulse peak power having the same and identical pulse width.The amplifying power of EDFA is adjusted
To 120 milliwatts, equivalent single pulse energy is 0.04mJ.Since different SNS structures has different coupling ratios, coupling ratio is by small
System is sequentially connected to big.It is the design of 5 ultrasonic exciting systems shown in the present invention, each ultrasonic action point
20% energy should be able to be extracted from fiber cores to cladding of fiber.That is, each ultrasonic exciting point has
0.008 megajoule of energy motivates ultrasonic signal.The luminous energy of the graphite epoxide absorbing coupling of each ultrasonic excitation point
And it is periodically expanded and contraction process.Shown in the ultrasonic signal such as Figure 10 (d) excited by SNS structure.It can from figure
To find out, ultrasonic signal has the repetition rate of 3kHz identical with pulsed laser light source, and the peak-to-peak value amplitude of each pulse connects
It is bordering on 510mV.Therefore, the ultrasonic signal of excitation has characteristic identical with light source, and the amplitude of ultrasonic signal is also very steady
It is fixed.
In the present invention shown in all detection results such as Figure 11 (a)-Figure 11 (e) of ultrasonic excitation unit.Each ultrasonic wave letter
Number peak-to-peak value can calculate separately as 517mV, 525mV, 510mV, 519mV and 522mV, near 510mV.Ultrasound
The small difference of signal peak and peak value and the coupling ratio of SNS structure and photoacoustic material are related in the coating layer thickness of test point.Obviously,
Each signal is balance excitation, and the relaxation time is about 5 μ s.Fast Fourier Transform is carried out to each time-domain signal,
And available corresponding frequency domain spectra, as shown in Figure 11 (f)-Figure 11 (j).Figure 11 (a)-Figure 11 (j) shows ultrasonic signal tool
There is very wide about 10 megahertzs of frequency spectrum.In addition, the amplitude of each ultrasonic action point in a frequency domain is in -40dB hereinafter, centre frequency
Close to 4MHz.Due to ultrasonic signal characteristic having the same and similar pulse shape, it can be deduced that the multiple spot ultrasonic wave of balance
Excitation.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (6)
1. a kind of distribution type fiber-optic laser-ultrasound transducing head based on coreless fiber, it is characterised in that: the ultrasonic transduction dress
The covering energy radiation based on coreless fiber is set than controllable, by by pulse seed source, high power erbium doped optical fibre light amplifier, height
Power Fiber isolator and energy irradiation structure group with coreless fiber are sequentially connected composition distribution type fiber-optic laser-ultrasound
Energy converting system；Wherein, the energy irradiation structure group packet with coreless fiber expands several by the coreless fiber of different length
Covering mode excitation unit, the specific structure of each unit is single mode optical fiber-coreless fiber-single mode optical fiber, described several
Covering mode excitation unit is sequentially connected with from short to long according to the length of coreless fiber part.
2. distribution type fiber-optic laser-ultrasound transducing head according to claim 1, it is characterised in that: the covering mode excitation
Unit includes importing single mode optical fiber, coreless fiber, export single mode optical fiber and optoacoustic transition material 204；Its course of work is to enter
The basic mode light beam penetrated transmits in importing single mode optical fiber, inspires various higher order modes when reaching coreless fiber, then into
Guided mode is formed when exporting single mode optical fiber to be transferred at optoacoustic transition material, cladding mode is used to generate ultrasonic signal, and in fibre core
The core model of middle transmission continues to transmit in fibre core until next ultrasonic excitation point.
3. distribution type fiber-optic laser-ultrasound transducing head according to claim 2, it is characterised in that: the acousto-optic conversion material
Material includes composite material and metal material；The composite material includes gold nano grain-polydimethylsiloxanemixture mixture, stone
Ink-epoxy resin composition, carbon nano-fiber-polydimethylsiloxanemixture mixture or carbon nanotube-dimethyl silicone polymer
Mixture；Metal material includes chromium, steel, gold, gold nano grain or titanium-aluminium alloy.
4. distribution type fiber-optic laser-ultrasound transducing head according to claim 2, it is characterised in that: the covering mode excitation
The preparation of unit includes the removal of coat, the corrosion of covering and the coating of ultrasonic excitation material at export single mode optical fiber,
Wherein, ultrasonic excitation material absorbs cladding mode energy production ultrasonic signal.
5. distribution type fiber-optic laser-ultrasound transducing head according to claim 2, it is characterised in that: using coreless fiber with
The characteristic of the characteristics of single mode optical fiber mode mismatch and coreless fiber cladding mode Energy distribution prepares different laser energy coupling
The ultrasonic transduction unit of ratio；When the pulse laser by the amplification of high power Erbium doped fiber laser amplifier reaches coreless fiber unit
When place, cladding mode is excited, and when entering derived single mode optical fiber, a part of laser energy, which continues to stay in fibre core, to be transmitted as
The ultrasonic excitation point in downstream provides energy, and another part energy conversion is cladding mode, and what is be coated after transmission a distance is super
Sound transition material, which absorbs, is used for ultrasonic excitation.
6. distribution type fiber-optic laser-ultrasound transducing head according to claim 1-5, it is characterised in that: single packet
The preparation flow of layer mode excitation unit are as follows: (1) by coreless fiber and hollow-core fiber welding first, then next section of nothing of (2) cutting
Coreless fiber after cleavage is welded together by core fibre, then (3) with single mode optical fiber, and then (4) use mechanical micro-displacement platform
Accurately cut the coreless fiber of lower certain length with high magnification microscope equipment, last (5) are by the coreless fiber and single mode of this one end
Fused fiber splice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810824788.6A CN108927314B (en) | 2018-07-25 | 2018-07-25 | Distributed optical fiber laser ultrasonic transducer based on coreless optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810824788.6A CN108927314B (en) | 2018-07-25 | 2018-07-25 | Distributed optical fiber laser ultrasonic transducer based on coreless optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108927314A true CN108927314A (en) | 2018-12-04 |
| CN108927314B CN108927314B (en) | 2020-06-30 |
Family
ID=64444607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810824788.6A Active CN108927314B (en) | 2018-07-25 | 2018-07-25 | Distributed optical fiber laser ultrasonic transducer based on coreless optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108927314B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044088A (en) * | 2019-12-12 | 2020-04-21 | 天津理工大学 | Humidity and stress double-parameter micro optical fiber sensor based on carbon nano tube compound |
| RU2763986C1 (en) * | 2020-10-02 | 2022-01-12 | Шлюмберже Текнолоджи Б.В. | Method for generating acoustic signals |
| WO2022238313A1 (en) * | 2021-05-12 | 2022-11-17 | Stöbich Life Safety GmbH | Fiber bragg sensor for detecting a target substance and method for manufacturing a fiber bragg sensor for detecting a target substance |
| US11835564B2 (en) | 2019-10-24 | 2023-12-05 | British Telecommunications Public Limited Company | Wireless telecommunications network |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094110A (en) * | 2016-07-27 | 2016-11-09 | 哈尔滨工业大学深圳研究生院 | Distribution type fiber-optic laser-ultrasound transducer based on optical fiber dislocation welding |
| CN107608030A (en) * | 2017-10-31 | 2018-01-19 | 深圳大学 | A kind of mixed type fiber coupler and preparation method thereof |
-
2018
- 2018-07-25 CN CN201810824788.6A patent/CN108927314B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094110A (en) * | 2016-07-27 | 2016-11-09 | 哈尔滨工业大学深圳研究生院 | Distribution type fiber-optic laser-ultrasound transducer based on optical fiber dislocation welding |
| CN107608030A (en) * | 2017-10-31 | 2018-01-19 | 深圳大学 | A kind of mixed type fiber coupler and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11835564B2 (en) | 2019-10-24 | 2023-12-05 | British Telecommunications Public Limited Company | Wireless telecommunications network |
| CN111044088A (en) * | 2019-12-12 | 2020-04-21 | 天津理工大学 | Humidity and stress double-parameter micro optical fiber sensor based on carbon nano tube compound |
| RU2763986C1 (en) * | 2020-10-02 | 2022-01-12 | Шлюмберже Текнолоджи Б.В. | Method for generating acoustic signals |
| WO2022238313A1 (en) * | 2021-05-12 | 2022-11-17 | Stöbich Life Safety GmbH | Fiber bragg sensor for detecting a target substance and method for manufacturing a fiber bragg sensor for detecting a target substance |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108927314B (en) | 2020-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108927314A (en) | A kind of distribution type fiber-optic laser-ultrasound transducing head based on coreless fiber | |
| CN105865614B (en) | A kind of novel optical fiber enamel amber ultrasonic hydrophone and preparation method thereof | |
| CN106124029A (en) | Fiber-optic hydrophone system based on the full optical phase modulator of micro-nano fiber | |
| CN109974758A (en) | The fibre optical sensor and preparation method measured simultaneously for deep three parameters of seawater thermohaline | |
| CN108107509A (en) | A kind of high-order swirl pattern production method and device based on less fundamental mode optical fibre | |
| CN106094110B (en) | Distributed optical fiber laser ultrasonic transducer based on optical fiber dislocation fusion | |
| CN103226205B (en) | Optical fiber sensing measurement method of laser plasma shock wave mechanical effect | |
| Li et al. | Fiber-optic multipoint laser-ultrasonic excitation transducer using coreless fibers | |
| CN112146690A (en) | Multi-parameter measuring device based on double-clad optical fiber | |
| Ji et al. | Multipoint all-fiber laser-ultrasound transducer using cascaded fiber waist-enlarged fusion tapers | |
| Diez et al. | Acoustic stop-bands in periodically microtapered optical fibers | |
| CN109143468B (en) | On-line tunable optical fiber internal integrated ultrasonic grating | |
| CN102944298A (en) | End sensitive fiber bragg grating high-intensity focused ultrasound sensor and system | |
| Dewhurst et al. | High power optical fibre delivery system for the laser generation of ultrasound | |
| CN102116896A (en) | Device and method for manufacturing stress refraction type long period fiber gating | |
| Li et al. | Multipoint and energy-equal fiber-optic laser-ultrasonic actuator based on peanut-shaped structures | |
| Shao et al. | Ultrasonic sensitivity-improved fiber-optic Fabry–Perot interferometer using a beam collimator and its application for ultrasonic imaging of seismic physical models | |
| Zhou et al. | A fiber optic acoustic pyrometer for temperature monitoring in an exhaust pipe of a boiler | |
| CN109632707A (en) | Concentration detection method based on fibre-optical F-P sensor | |
| CN109038205A (en) | A kind of method of stimulated Raman scattering phenomenon in inhibition optical fiber laser | |
| Du et al. | Miniature all-optical angle-focused photoacoustic transducer | |
| Dong et al. | Efficient laser-ultrasound generation at optical fiber sidewall based on core-offset splicing fiber | |
| He et al. | Single-mode helical sapphire fiber Bragg grating for high-temperature sensing | |
| He et al. | An acoustic waveguide with tight field confinement for high temperature sensing | |
| Luo et al. | Multi-point fiber optic laser-ultrasonic transducer based on long-period fiber grating |
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 |