CN108252891A - A kind of Laser Driven Macro Flow device and method based on optical fiber - Google Patents
A kind of Laser Driven Macro Flow device and method based on optical fiber Download PDFInfo
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- CN108252891A CN108252891A CN201810178888.6A CN201810178888A CN108252891A CN 108252891 A CN108252891 A CN 108252891A CN 201810178888 A CN201810178888 A CN 201810178888A CN 108252891 A CN108252891 A CN 108252891A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
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Abstract
The present invention proposes a kind of Laser Driven Macro Flow device and method based on optical fiber, and the simple combination for solving the problems, such as optoacoustic effect and sound wave driving hydrodynamic effect can not generate macroscopical liquid flowing.Nanogold particle is injected into the end face of optical fiber using injection technique by the present invention, it is fixed and is immersed in by driving solution, simultaneously by nanosecond laser pulses from optical fiber other end coupled into optical fibres, laser pulse interacts with being injected into nanogold particle in optical fiber, nanogold particle is under laser action since optoacoustic effect generates ultrasound, while liquid is driven to flow since sound wave drives hydrodynamic effect again.The present invention does not need to fixed liquid-liquid interface and fluid course not only, and liquid to flowing and environment are also without special requirement, suitable for any liquid, it can be achieved by the tunable of driving flow rate of liquid and direction, using CCD on-line real time monitorings by the flowing of driving liquid, control accuracy is substantially increased, and convenient and simple for operation.
Description
Technical field
The present invention relates to photoelectronics, acoustics, nanometers to prepare the subjects that intersect such as, fluid dynamics, solid-state mechanics
Technical field can be applicable to Laser Driven, the cleaning of micro-fluidic, laser surgery, transport or the fields more particularly to one such as liquid mixing
Laser Driven Macro Flow device and method of the kind based on optical fiber.
Background technology
The birth of nineteen sixty First laser indicates that photoelectric technology enters a completely new field, however as light
Technology flourishes, traditional Solid-state Optics device be difficult to meet increasingly increased micromation, it is integrated, can tune into the melt etc. it is existing
For the development of optical technology, while the challenge of bigger, especially Laser Driven are brought to laser steering technology and actuation techniques
Liquid flow technique.Laser not only represents high intensity and directionality, but also since photon has linear momentum, also has machinery
Power, if so can realize effective momentum conversion, this unique characteristic can generate material stream using laser.
Light-operated liquid flow technique is to promote a new technology of the fields such as microfluidic system and hydrodynamics development.
Liquid with precise control flowing realizations be necessarily dependent upon outside energy converter, such as pump, valve, machine power, hydraulic technique or
Person's pneumatic system etc., however in a micro-flow system establish as outer transducer undoubtedly increase system complexity and into
This, and these equipment easily pollute liquid, and the operation of complex fluid flowing proposes higher choose to manufacturing industry again
War.Optical drive overcomes these limitations well, and light is not only able to realize noncontact driving, and can realize tunable
（Wavelength and power）, have good space (~ μm) and temporal resolution (<ms).In addition to this, optical drive biggest advantage is
With biocompatibility, this provides convenience to it in the forward positions such as biology, medicine, chemistry, physics interdisciplinary field.At present,
Generate and control the method for liquid flowing and principle mainly to have optical pressure driving, optical tweezer, the driving of photoproduction moist gradient, hot hair using light
Tubule effect driving etc..
There is light irradiation to press, but since this irradiation pressure is very faint and usually ignored, optical pressure can cause liquid to become
Shape.When laser beam irradiation is in two refractive index difference and immiscible liquid surface, photon irradiation generates irradiation pressure, leads to interface
The side low to refractive index is distorted, and distortion direction is unrelated with direction of beam propagation.However laser irradiation pressure is utilized to generate liquid
Body flows or is distorted liquid level, liquid is needed to scatter incident light strongly, while also need to the surface tension close to zero, right
These conditions are all difficult to realize for liquid.Momentum is converted directly into interface deformation relative to photon, photon may be used also
To capture and manipulate the solids of micron-scale and cell, these particles can be used as moving source driving liquid flowing, also
It is the optical tweezer that we are commonly called as.It is but not high but also past using the flow rate of liquid that the liquid stream driving device that optical tweezer is realized not only generates
Toward complicated micro Process step is needed, device flexibility is very low, and maximum volume flow also only has tens pL/min, so also only
Suitable for the control of micro liquid stream；Capillary force can also manipulate and transmit liquid flow, and in the state of the equilibrium, interfacial force reaches
It balances and forms Free Surface, if interface can change, this balance will be broken and generate flowing.In a broad sense, hair
There are two ways to tubule power realizes liquid flowing：Change solid-liquid surface tension or generate a liquid gas surface tension component.By
In photoproduction moist gradient effect or photoproduction Marangoni effects, light irradiation can not only realize that solid-liquid surface tension changes, and
Liquid gas surface tension component can be generated.However photoproduction moist gradient can only generate on the photosensitive medium of humidity characteristic,
This limits application to a certain extent.And photoproduction Marangoni effects refer to light since fuel factor is in two immiscible liquids circle
Face generates tension gradient, so as to cause liquid from the high region of the low field flow orientation interfacial tension of interfacial tension.Although photic heat
Capillary effect can drive liquid to flow, but realize that liquid flowing not only needs high intensity laser beam, but also also need to entering
The material that penetrating laser can absorb by force generates local heating, however many biosystems are all very sensitive to heat, this is with regard to tight
The application field of photic thermo-capillary effect driving liquid flowing is limited again.
Cucumber is in the light irradiation by Periodic intensity modulation, since optoacoustic effect can generate ultrasonic wave, simultaneously
Again since sound wave drives hydrodynamic effect, the ultrasonic wave of generation can drive the flowing of liquid, however optoacoustic effect and sound wave drive
The simple combination of hydrodynamic effect can not generate macroscopical liquid flowing.
Invention content
Simple combination for optoacoustic effect and sound wave driving hydrodynamic effect can not generate the technology of macroscopical liquid flowing
Problem, the present invention propose a kind of Laser Driven Macro Flow device and method based on optical fiber, using being injected with nanogold particle
Optical fiber optoacoustic effect and sound wave driving hydrodynamic effect can be ideally coupled, using injection technique by gold nano
Grain injection fibre one end end face, while by nanosecond laser pulses by optical fiber other end coupled into optical fibres, injection fibre is received
Rice gold particle is under laser action since optoacoustic effect generates ultrasonic wave, while lead to light since sound wave drives hydrodynamic effect again
Fine liquid nearby flows, so as to fulfill macroscopical liquid flow at high speed.
In order to achieve the above object, the technical proposal of the invention is realized in this way：A kind of Laser Driven based on optical fiber
Nanogold particle is injected into the end face of optical fiber using injection technique by Macro Flow method, is fixed and is immersed in and is driven
In dynamic solution, while by nanosecond laser pulses from optical fiber other end coupled into optical fibres, laser pulse is with being injected into optical fiber
Nanogold particle interacts, and nanogold particle is under laser action since optoacoustic effect generates ultrasound, while again due to sound wave
It drives hydrodynamic effect and liquid is driven to flow, its step are as follows：
Step 1：The optical fiber one end for being injected with nanogold particle is fixed and is immersed in by driving liquid, optical fiber fixed-direction
It is consistent with by driving liquid flow direction；
Step 2：Nanosecoud pulse laser is opened, laser pulse is coupled to the optical fiber other end, i.e. optical fiber not after lens focus
Inject nanogold particle end；
Step 3：Laser output laser pulse energy is adjusted, so as to control liquid flow velocity, while adjusts grip optical fiber side
To so as to control liquid flow path direction；
Step 4：Computer control is real-time transmitted to by the liquid flow field of the real-time monitoring driving fluids of CCD, and by monitoring result
System, computer control system are recorded；
Step 5：Computer control system calculates the flow velocity and flow direction of liquid flow field according to the real time data that the CCD of reception is transmitted,
And obtained flow velocity will be analyzed and flow to the flow velocity and flow direction inputted with client and compared, swashed nanosecond according to comparing result fine tuning
The flowing velocity and fine tuning fibre holder of light device output energy hole liquid fix fiber position and change liquid flow direction.
The nanogold particle is injected by gold ion injection technique to the driving liquid flow moved end of optical fiber.
Described by driving liquid is except can generate corrosiveness and the liquid to micro nanogold particle sensitivity to optical fiber
External all liq.
A kind of Laser Driven Macro Flow device based on optical fiber, including nanosecond laser, lens, optical fiber, optical fiber clamping
Device, container, CCD, isochronous controller and computer control system, optical fiber are fixed on fibre holder, and optical fiber both ends are respectively
Unimplanted nanogold particle end and driving liquid flow moved end, the driving liquid flow moved end injection nanogold particle of optical fiber；Lens and
The unimplanted nanogold particle end of optical fiber is arranged on the output light path of nanosecond laser, the driving liquid flow moved end submergence of optical fiber
In container by driving liquid；CCD is equipped with before the container, CCD is connected with computer control system, computer control
System is connected with isochronous controller, and isochronous controller is connected respectively with nanosecond laser, fibre holder and CCD.
The nanosecond laser is the nanosecond laser that wavelength is 527nm, and the pulsewidth of nanosecond laser is 150ns, repeats
Frequency 1kHz；The lens are short focus lens, and fibre holder is five dimension adjusting control devices, and fibre holder can control optical fiber edge
Any direction moves.
The end face at the unimplanted gold nano grain end of the optical fiber is located at lens focus, the laser of nanosecond laser output
The coupling effect of pulse-couple into optical fiber is more than 50%.
The unimplanted gold nano grain end of optical fiber is fixed, and fixed-direction can require liquid flow path direction freely to change according to user
Become, driving liquid flow moved end is injection gold nano grain end, is immersed in by driving liquid.
The container is selected in material of the visible light wave range transmitance more than 90%, and the shape of container towards CCD sides is flat
Face structure；It is described by driving liquid be pure water.
The CCD is photodetector, and the pixel of CCD is 1280 × 1024.
Its course of work is：The laser pulse that the nanosecond laser is sent out is coupled into light after short focal length lens focuses on
Fibre, the one end at optical fiber injection gold nano grain end be immersed in container by driving liquid, CCD observations in real time are by driving liquid
Flow field, and observed result is real-time transmitted to computer control system, computer control system in real time carries out observed result
Analysis, while output energy, the optical fiber of nanosecond laser are clamped by isochronous controller according to analysis result and user demand
Device is fixed the position of optical fiber and the position of CCD and is finely adjusted.
Beneficial effects of the present invention：It is acted on using the nanogold particle in injection fibre end face in nanosecond laser pulses, by
Ultrasonic wave is generated, while cause and macroscopic view flowing is occurred by driving liquid since sound wave drives hydrodynamic effect again in optoacoustic；Not only
Fixed liquid-liquid interface and fluid course are not needed to, and liquid to flowing and environment are suitable for also without special requirement
Any liquid, even pure water can also realize flow at high speed, and direction is controllable；Not only liquid flow velocity is high, and flow velocity is up to
4cm/s, and working fluid also breaches the limitation of μ L drops, has reached the overall flow of macro-scale.The present invention can pass through
The energy hole of nanosecond laser pulses is controlled by driving flow rate of liquid, while can be by the way that optical fiber is controlled to inject gold nano grain end
Direction controlling by driving liquid flow direction, you can realize tunable by driving flow rate of liquid and direction.The present invention uses CCD
On-line real time monitoring is handled in real time by the flowing of driving liquid, and monitoring result Real-time Feedback to computer control system, root
Nanosecond laser pulses energy and optical fiber injection gold nano grain end position are carried out according to the result of processing and the actual needs of user
Fine tuning, substantially increases control accuracy, and convenient and simple for operation.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the result schematic diagram that macroscopic view flowing occurs for present invention driving pure water.
Ultrasonic signal when Fig. 3 is present invention driving pure water generation macroscopic view flowing
Wherein, 1 is nanosecond laser, and 2 be lens, and 3 be optical fiber, and 4 be fibre holder, and 5 be container, and 6 be CCD, and 7 be synchronous control
Device processed, 8 be computer control system.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of not making the creative labor
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of Laser Driven Macro Flow method based on optical fiber, using injection technique by gold nano grain
Injection fibre one end end face, while by nanosecond laser pulses after lens focus, optical fiber is coupled into from optical fiber other end, it notes
Enter the nanogold particle of optical fiber under laser action since optoacoustic effect generates ultrasonic wave, while again due to sound wave driving fluid effect
It answers and liquid near optical fiber is caused to flow, flowed so as to fulfill macroscopical liquid.By the energy for changing nanosecond laser pulses
The flowing velocity of liquid can be controlled；And liquid flow direction is consistent with the optical fiber extreme direction for injecting nanogold particle, passes through control
Liquid flow direction can be changed in optical fiber placement direction processed, and its step are as follows：
Step 1：The optical fiber one end for being injected with nanogold particle is fixed and is immersed in by driving liquid, optical fiber fixed-direction
It needs with requiring liquid flow direction consistent.
Optical fiber injection nanogold particle end is fixed on First Five-Year Plan dimension adjusting control device, and five dimension adjusting control devices can be controlled
Optical fiber injection nanogold particle end processed is moved along any direction, this end face direction of liquid flow direction and optical fiber is consistent, in this way may be used
To realize that the liquid of any direction flows.A certain amount of nanogold is injected to the end face of optical fiber using gold ion injection technique
Grain.
Step 2：Nanosecoud pulse laser is opened, laser pulse is coupled to the unimplanted nanogold of optical fiber after lens focus
Particle end；
Optical fiber unimplanted gold nano grain end end face is placed exactly at lens focus, and lens just focus on nanosecond laser pulses
Optical fiber unimplanted gold nano grain end end face, and nanosecond laser pulses need normal incidence to enter optical fiber, meanwhile, lens need to select
With short focal length lens, it just can guarantee laser with maximum coupling efficiency coupled into optical fibres, the laser of nanosecond laser output in this way
The coupling efficiency of pulse-couple into optical fiber should be greater than 50%.Nanosecond laser pulses wavelength is 527nm, pulse width 150ns, is put down
Equal power is more than 50mW.
Step 3：Laser output laser pulse energy is adjusted, so as to control liquid flow velocity, while adjusts clamping light
Fine direction, so as to control liquid flow path direction.
Liquid flow velocity is directly proportional to output laser pulse energy, and liquid flow direction injects nanogold particle with optical fiber
Extreme direction is consistent.
Step 4：Liquid flow field is monitored, and monitoring result is real-time transmitted to computer control system by CCD in real time,
Computer control system is recorded.
Step 5：Computer control system calculates the flow velocity and flow direction in flow field according to the real time data that the CCD of reception is transmitted,
And obtained flow velocity will be analyzed and flow to the flow velocity and flow direction inputted with client and compared, synchronous control is passed through according to comparing result
Device fine tuning nanosecond laser output energy and fibre holder processed fix fiber position, until meeting client's needs.
The flowing velocity of nanosecond laser output energy hole liquid and fine tuning fibre holder are finely tuned according to comparing result
Fixed fiber position changes liquid flow direction.Computer control system can also select the integration of CCD by isochronous controller
The parameters such as time, resolution ratio.
The nanosecond laser pulses of coupled into optical fibres of the present invention and the nanogold particle of injection fibre interact, nanogold
Grain absorbs incident laser energy and expands, since nanogold particle is operated in the high repetition frequency arteries and veins that repetition rate is 1kHz
Under punching effect, repetition pulse effect causes nanogold particle temperature high-frequency lifting occur, occurs so as to cause gold particle volume
High-frequency harmomegathus, thus to external radiation ultrasonic wave, i.e., the nanogold particle of so-called optoacoustic effect namely injection fibre is in nanosecond
Under the action of laser pulse, since optoacoustic effect generates ultrasonic wave.Simultaneously again since sound wave drives hydrodynamic effect, liquid is in ultrasound
Macroscopic view flowing occurs under the action of wave.The simple superposition of optoacoustic effect and sound wave driving hydrodynamic effect can not drive liquid
After nanogold particle injection fibre, optoacoustic effect and sound wave driving hydrodynamic effect are organically coupled for flowing, so as to
Nearby macroscopic view flowing occurs for liquid for driving.Liquid flow velocity is directly proportional to incident laser pulse energy, liquid flow direction with
Optical fiber injection gold nano grain extreme direction is consistent.The present invention also provides one for the Laser Driven Macro Flow method based on optical fiber
Laser Driven fluidic device of the kind based on optical fiber, the device can drive liquid that macroscopic view flowing occurs under the action of laser, and
And the computer control system in the device can not only be needed to according to the flow velocity and flow direction that need liquid with precise control of user
Fixed liquid-liquid interface and fluid course, and liquid to flowing and environment be also without special requirement, suitable for any liquid
Body, even pure water can also realize flow at high speed, and direction is controllable.
As shown in Figure 1, a kind of Laser Driven Macro Flow device based on optical fiber, including nanosecond laser 1, lens 2, is adopted
It is injected with the optical fiber 3 of nanogold particle at one end with injection technique, fibre holder 4, can hold by the container of driving liquid
5th, the CCD 6, isochronous controller 7 and computer control system 8 of liquid flow field can be observed.Optical fiber 3 is fixed on fibre holder 4
On, 3 both ends of optical fiber are respectively unimplanted nanogold particle end and driving liquid flow moved end, and the driving liquid flow moved end of optical fiber 3 leads to
Cross gold ion injection technique injection nanogold particle.The unimplanted nanogold particle end of lens 2 and optical fiber 3 is arranged on nanosecond laser
On the output light path of device 1, the laser that nanosecond laser 1 is sent out is focused on the unimplanted nanogold particle end of optical fiber 3 by lens 2
On end face, the driving liquid flow moved end of optical fiber 3 be immersed in container 5 by driving liquid.5 front of container is equipped with
CCD6, CCD6 are connected with computer control system 8, and computer control system 8 is connected with isochronous controller 7, and isochronous controller 7 divides
It is not connected with nanosecond laser 1, fibre holder 4 and CCD6.
Preferably, 3 unimplanted gold nano grain end of optical fiber is fixed, and the laser pulse sent out convenient for nanosecond laser 1 is with most
Big coupling efficiency coupled into optical fibres 3, so as to which liquid be driven to flow.Liquid flow moved end is driven as injection gold nano grain end, leaching
Not in by driving liquid, under the action of fibre holder 4, fixed-direction can require liquid flow path direction freely to change according to user
Become.
The unimplanted gold nano grain end of optical fiber is focused on from the nanosecond laser pulses that nanosecond laser 1 is sent out through lens 2
End face, is coupled into optical fiber 3, and nanosecond laser pulses need normal incidence to enter optical fiber 3.It is coupled into the nanosecond laser arteries and veins of optical fiber 3
The gold nano grain that gold nano grain end is injected in punching with optical fiber 3 interacts, due to optoacoustic effect and sound wave driving hydrodynamic effect
Collective effect causes optical fiber 3 to inject gold nano grain end liquid generation nearby macroscopic view flowing at a high speed, and flow direction is injected with optical fiber 3
Gold nano grain end is consistent.CCD 6 is observed in real time and is recorded liquid flow field image, and give the image of record to computer control
System 8.Computer control system 8 preserves the image that CCD 6 is sent first, the flow field secondly sent according to CCD 6
Image analyzes flow rate of liquid and flow direction in real time, and the flow velocity for analyzing obtained flow velocity and flow direction and client's input and flow direction are carried out
Comparison according to comparing result, finely tunes nanosecond laser 1 by isochronous controller 7 and exports energy and the fixation optical fiber of fibre holder 4
Position, it is final to realize customer requirement flow rate of liquid and flow direction.Computer control system 8 can also be sent according to CCD 6
Flow field picture quality, pass through isochronous controller 7 and adjust the time of integration of CCD 6 and the parameters such as resolution ratio.
The present invention is organically coupled optoacoustic effect and sound wave driving hydrodynamic effect using the gold nano grain of injection fibre
Together, in the case of no fixed liquid-liquid interface and fluid course, macroscopical liquid flow at high speed is realized.The present invention can
Except having corrosiveness and to all liq in addition to micro gold nano grain sensitivity to optical fiber, flow rate of liquid is up to several cm/ for driving
S, directly proportional to nanosecond laser pulses energy, liquid flow direction is consistent with optical fiber injection gold nano grain end.Isochronous controller 7
It is connected respectively with nanosecond laser 1, fibre holder 4, CCD 6 and computer control system 8, computer control system 8
According to client to flow rate of liquid and flow direction needs, by isochronous controller 7 control nanosecond laser 1 unlatching and output energy,
4 grip optical fiber position of fibre holder and unlatching and the parameter setting of CCD 6, the monitoring liquid flow fields, and will monitoring in real time of CCD 6
Image sends computer control system 8 to, and computer system 8 analyzes image to obtain flow rate of liquid and flow direction, and will divide
Analysis result is compared with client's input results, according to comparing result, is finely tuned nanosecond laser 1 by isochronous controller 7 and is exported
4 grip optical fiber position of energy and fibre holder, it is accurate to control flow field velocity and flow direction.
Specific example：
Further, optical fiber 3 is the multimode fibre that core diameter is 200 μm, and length 30cm, 3 one end of optical fiber is using injection skill
Art injects gold nano grain, and injection rate is usually 4 × 1016Au/cm2, Implantation Energy 60keV.
Nanosecond laser 1 be send out laser pulse wavelength be 527nm, pulsewidth 150ns, mean power 120mW.Thoroughly
Mirror 2 is the short focus lens for being focused to 50mm.CCD 6 is photodetector, and pixel is 1280 × 1024.CCD 6 is Pixelink
PL-B742U types CCD.7 inside of isochronous controller is converted using 12 A/D, D/A, and resolution ratio is up to 0.1%.Computer control system
System 8 is general PC machine.
Each element is connected according to structure shown in Fig. 1, opens the Laser Driven fluidic device control in computer control system 8
Software processed, this control software be based on WINDOWS operating systems, the control software voluntarily worked out using C Plus Plus, for control and
Coordinate the operation of each optical element, the processing of experimental data and output etc. in the light path of Fig. 1.Pure water is packed into container 5, and soak
Do not have the driving liquid flow moved end of optical fiber 3.Using Laser Driven fluidic device control software by the way that fibre holder 4 is controlled to adjust light
Fibre 3 injects gold nano grain end clip position, and clip position is adjusted according to the liquid flow path direction that client needs.Then swashing again
Flow stream velocity is inputted in optical drive fluidic device control software, flow stream velocity is also to be inputted according to customer demand.Computer
Control system 8 opens nanosecond laser 1 and CCD 6 by isochronous controller 7, while soft by the control of Laser Driven fluidic device
Part sets the operating parameters such as 6 times of integration of CCD and resolution ratio.Computer control system 8 automatically saves the flow field that CCD 6 is sent back to
Image, while the flow field image that CCD 6 is sent back to is analyzed, obtain flow rate of liquid and liquid flow path direction.Computer control system 8
Obtained flow velocity will be analyzed simultaneously and the flow field parameter that flow field parameters input with client such as flow to and compared, according to comparing result,
Nanosecond laser 1, fibre holder 4 and CCD 6 are finely adjusted by isochronous controller, until with inputting unanimously.Task knot
Shu Shi, computer control system 8 export trigger signal and close all devices.
The nanosecond laser pulses that nanosecond laser 1 is sent out are coupled into optical fiber 3, nanosecond laser pulses after the focusing of lens 2
It interacts with the nanogold particle injected in optical fiber 3, is driven due to optoacoustic effect and sound wave driving hydrodynamic effect collective effect
Hydrodynamic body flows, as shown in Figure 2.It is shown according to fig. 2 as a result, flow at high speed has occurred in pure water under the driving of laser, stream
Speed is 2.5cm/s.When Fig. 3 gives liquid generation flow at high speed, the ultrasonic signal of optoacoustic effect generation.Shown knot according to fig. 3
Fruit, the nanogold particle injected in optical fiber 3 under the action of nanosecond laser pulses, due to optoacoustic effect produce the duration compared with
Long ultrasonic signal.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.
Claims (10)
- A kind of 1. Laser Driven Macro Flow method based on optical fiber, which is characterized in that using injection technique by nanogold particle The end face of optical fiber is injected into, be fixed and is immersed in by driving solution, while nanosecond laser pulses are another from optical fiber End coupling interacts into optical fiber, laser pulse and the nanogold particle being injected into optical fiber, and nanogold particle is made in laser Since optoacoustic effect generates ultrasound, while liquid is driven to flow since sound wave drives hydrodynamic effect again under, step It is as follows：Step 1：The optical fiber one end for being injected with nanogold particle is fixed and is immersed in by driving liquid, optical fiber fixed-direction It is consistent with by driving liquid flow direction；Step 2：Nanosecoud pulse laser is opened, laser pulse is coupled to the optical fiber other end, i.e. optical fiber not after lens focus Inject nanogold particle end；Step 3：Laser output laser pulse energy is adjusted, so as to control liquid flow velocity, while adjusts grip optical fiber side To so as to control liquid flow path direction；Step 4：Computer control is real-time transmitted to by the liquid flow field of the real-time monitoring driving fluids of CCD, and by monitoring result System, computer control system are recorded；Step 5：Computer control system calculates the flow velocity and flow direction of liquid flow field according to the real time data that the CCD of reception is transmitted, And obtained flow velocity will be analyzed and flow to the flow velocity and flow direction inputted with client and compared, swashed nanosecond according to comparing result fine tuning The flowing velocity and fine tuning fibre holder of light device output energy hole liquid fix fiber position and change liquid flow direction.
- 2. the Laser Driven Macro Flow method according to claim 1 based on optical fiber, which is characterized in that the nanogold Particle is injected by gold ion injection technique to the driving liquid flow moved end of optical fiber.
- 3. the Laser Driven Macro Flow method according to claim 1 based on optical fiber, which is characterized in that described to be driven Liquid is except can generate corrosiveness and to all liq in addition to the liquid of micro nanogold particle sensitivity to optical fiber.
- 4. a kind of Laser Driven Macro Flow device based on optical fiber, which is characterized in that including nanosecond laser（1）, lens （2）, optical fiber（3）, fibre holder（4）, container（5）、CCD（6）, isochronous controller（7）And computer control system（8）, light It is fine（3）It is fixed on fibre holder（4）On, optical fiber（3）Both ends are respectively unimplanted nanogold particle end and driving liquid flowing End, optical fiber（3）Driving liquid flow moved end injection nanogold particle；Lens（2）And optical fiber（3）Unimplanted nanogold particle end It is arranged on nanosecond laser（1）Output light path on, optical fiber（3）Driving liquid flow moved end be immersed in container（5）Interior is driven In hydrodynamic body；The container（5）Front is equipped with CCD（6）, CCD（6）With computer control system（8）It is connected, computer control system System（8）With isochronous controller（7）It is connected, isochronous controller（7）Respectively with nanosecond laser（1）, fibre holder（4）And CCD （6）It is connected.
- 5. the Laser Driven Macro Flow device according to claim 4 based on optical fiber, which is characterized in that the nanosecond swashs Light device（1）Be wavelength be 527nm nanosecond laser, nanosecond laser（1）Pulsewidth be 150ns, repetition rate 1kHz；It is described Lens（2）For short focus lens, fibre holder（4）For five dimension adjusting control devices, fibre holder（4）Controllable optical fiber（3）Edge Any direction moves.
- 6. the Laser Driven Macro Flow device according to claim 4 based on optical fiber, which is characterized in that the optical fiber （3）The end face at unimplanted gold nano grain end be located at lens（2）Focal point, nanosecond laser（1）The laser pulse coupling of output It closes into optical fiber（3）Coupling effect be more than 50%.
- 7. the Laser Driven Macro Flow device based on optical fiber according to claim 4 or 6, which is characterized in that the light It is fine（3）Unimplanted gold nano grain end fix, fixed-direction can freely change, and driving liquid flow moved end is injection gold nano Grain end is immersed in by driving liquid.
- 8. the Laser Driven Macro Flow device according to claim 4 based on optical fiber, which is characterized in that the container （5）It selects in material of the visible light wave range transmitance more than 90%, container（5）Towards CCD（6）The shape of side is planar structure； It is described by driving liquid be pure water.
- 9. the Laser Driven Macro Flow device according to claim 4 based on optical fiber, which is characterized in that the CCD（6） For photodetector, CCD（6）Pixel be 1280 × 1024.
- 10. the Laser Driven Macro Flow device according to claim 4 based on optical fiber, which is characterized in that its is worked Cheng Wei：The nanosecond laser（1）The laser pulse sent out is through short focus away from lens（2）Optical fiber is coupled into after focusing（3）, light It is fine（3）The one end at injection gold nano grain end is immersed in container（5）It is interior by driving liquid, CCD（6）Observation is driven in real time The flow field of liquid, and observed result is real-time transmitted to computer control system（8）, computer control system（8）In real time to seeing Result is surveyed to be analyzed, while pass through isochronous controller according to analysis result and user demand（7）To nanosecond laser（1）It is defeated Go out energy, fibre holder（4）The position of fixed optical fiber and CCD（6）Position be finely adjusted.
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