CN107884061A - A kind of dynamic photoelasticity ultrasonic imaging method and system - Google Patents
A kind of dynamic photoelasticity ultrasonic imaging method and system Download PDFInfo
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- CN107884061A CN107884061A CN201711240047.5A CN201711240047A CN107884061A CN 107884061 A CN107884061 A CN 107884061A CN 201711240047 A CN201711240047 A CN 201711240047A CN 107884061 A CN107884061 A CN 107884061A
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- light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/002—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means for representing acoustic field distribution
Abstract
The present invention relates to a kind of dynamic photoelasticity ultrasonic imaging method and system, the system includes：Synchronizing relay system, ultrasound emission system and ultrasonic transducer, in addition to collimated light beam generation unit, the polarizer, sample placement point, analyzer, imaging len and collecting unit；Wherein, the sample placement point, between the polarizer and the analyzer, for placing observing samples；The collimated light beam generation unit, for producing the uniform collimated light beam of light distribution；The polarizer and analyzer, for handling collimated light beam, obtain the light pulse signal of high s/n ratio；The imaging len, for the light pulse signal of reception to be imaged；The collecting unit, the light pulse signal of the imaging len is passed through for multi collect, is then overlapped, realizes ultrasonic imaging.The present invention is remarkably improved system sensitivity, realizes more preferable ultrasonic imaging effect, and observes the faint ultrasonic field of solid interior.
Description
Technical field
The application is related to ultrasonics technical field, more particularly to the imaging of ultrasonic sound field and system in solid, and in particular to
A kind of dynamic photoelasticity ultrasonic imaging method and system.
Background technology
The quantitative measurment of ultrasonic sound field is for the ultrasonic propagation and Scattering Rules in solids of research, exploitation ultrasound in solid
Non-Destructive Testing new technology is significant.
Published by Ying Chongfu etc. in National Defense Industry Press within 1994《The scattering of ultrasound in solids》In disclose one
The kind photoelastic supersonic imaging apparatus of dynamic laser, and the method for discussing ultrasonic sound field in measurement transparent solid.The light source of the system
For pulse laser, have the advantages that energy is high, pulse is short compared to LED light source.The laser beam of pulse laser transmitting, has
The spatial distribution of single mode or multimode, show as Gaussian Profile or multiple hot spots.After laser directly expands, still with original sky
Between be distributed, therefore can not to sample carry out uniform exposure, so as to influence ultrasound image quality and quantitative measurment precision.
The existing dynamic photoelasticity ultrasonic image-forming system based on laser, the general fundamental transverse mode laser for using Gaussian Profile
Device, shaping is not carried out to the spatial distribution of beam energy, therefore uniform exposure can not be carried out to sample, cause picture centre part
It is partially bright, cause measurement error.In addition, the pixel of picture centre is easily saturated, it is unfavorable for quantitative measurment.If with flat-top light shaping device
Shaping is carried out to Gaussian beam, more uniform light beam can be obtained, but the shake of its edge energy is larger, is unfavorable for being imaged and quantitatively surveys
Amount, and cost is very high.
In addition, existing business or laboratory are typically polarized from the polarizer and analyzer of the photoelastic system ground using resin
Piece, its extinction ratio is low (to be no more than 1000：1) with the presence of larger noise in the optical signal for, causing to receive, and it is difficult to by image
Reason method removes, therefore system signal noise ratio and sensitivity are relatively low, it is impossible to observes faint ultrasonic signal.
The content of the invention
A kind of technical problem that the present invention presently, there are for solution, there is provided highly sensitive dynamic photoelasticity ultrasonic imaging side
Method and system, to observe the faint ultrasonic sound field of solid interior.
To achieve the above object, in a first aspect, the invention provides a kind of dynamic photoelasticity ultrasonic image-forming system, a kind of dynamic
Photoelastic ultrasonic image-forming system, in addition to including synchronizing relay system, ultrasound emission system and ultrasonic transducer, in addition to collimated light beam
Generation unit, the polarizer, sample placement point, analyzer, imaging len and collecting unit；Wherein, the sample placement point, is located at
Between the polarizer and the analyzer, for placing observing samples；
The collimated light beam generation unit, for producing the uniform collimated light beam of light distribution；
The polarizer and analyzer, for handling collimated light beam, obtain the light pulse signal of high s/n ratio；
The imaging len, for the light pulse signal of reception to be imaged；
The collecting unit, the light pulse signal of the imaging len is passed through for multi collect, is then overlapped, it is real
Existing ultrasonic imaging.
Preferably, the directional light generation unit includes pulse laser, beam homogenizing device, convex lens, diaphragm peace
Convex lens；
The pulse laser, for emission pulse laser beam；
The beam homogenizing device, for the homogenizing processing of pulse laser beam, forming the light beam of even intensity；
The convex lens, enter line convergence for the light beam after handling homogenizing；
The diaphragm, for limiting convergent beam, eliminate part veiling glare；
The planoconvex spotlight, for being collimated to the light beam for eliminating part veiling glare, form uniform directional light.
Preferably, the polarizer and analyzer are specially Glan-Taylor prism.
Second aspect, the invention provides a kind of dynamic photoelasticity ultrasonic imaging method, methods described includes：
Produce the uniform collimated light beam of light distribution；
By the polarizer and analyzer of High Extinction Ratio, the light pulse signal of high s/n ratio is obtained；
Imaging len receives the light pulse signal, and it is imaged；
The light pulse signal of imaging len described in multi collect, is then overlapped, and realizes ultrasonic imaging.
Preferably, the generation uniform collimated light beam of light distribution, it is specially：
Pulse laser emission pulse laser beam；
By beam homogenizer to the homogenizing processing of pulse laser beam, the light beam of even intensity is formed；
Line convergence is entered to the light beam after homogenizing processing using convex lens；
Convergent beam is limited using diaphragm, eliminates part veiling glare；
The light beam for eliminating part veiling glare is collimated using quasi- convex lens, forms uniform directional light.
Preferably, the polarizer of the High Extinction Ratio and analyzer are specially Glan-Taylor prism.
A kind of highly sensitive dynamic photoelasticity ultrasonic imaging method provided by the invention and system, the system are swashed using pulse
Light device is modulated to laser using homogenizing device as light source, forms the diffusion light beam with uniform light distribution, then pass through
Convergent lens and diaphragm are modulated, and it is approximately the light that small light source is sent to make light beam.Light beam collimates by planoconvex spotlight again, New Year
Square has the directional light of uniform light distribution, and then replacing traditional resin using the Glan-Taylor prism of High Extinction Ratio polarizes
Piece, system signal noise ratio is improved, faint ultrasonic signal is finally observed using the multiexposure, multiple exposure addition method.The present invention, which is remarkably improved, is
System sensitivity, realizes more preferable ultrasonic imaging effect, and observe the faint ultrasonic field of solid interior.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description briefly to introduce.It should be evident that what is reflected in accompanying drawings below is only this
The part of the embodiment of invention, for those of ordinary skill in the art, without having to pay creative labor, also
The other embodiment of the present invention can be obtained according to these accompanying drawings.And all these embodiments or embodiment are all the present invention's
Within protection domain.
Fig. 1 is dynamic photoelasticity ultrasonic image-forming system provided in an embodiment of the present invention；
Fig. 2 is the scheme schematic diagram for producing light distribution uniform parallel light beam；
Fig. 3 is dynamic photoelasticity ultrasonic imaging method schematic flow sheet provided in an embodiment of the present invention；
Fig. 4 is the generation uniform collimated light beam schematic flow sheet of light distribution provided in an embodiment of the present invention；
Fig. 5 is the light beam after homogenizing；
Fig. 6 arrives ultrasonic from wave impulse for system photographs；
Fig. 7 is the image collected using resin polarizer；
Fig. 8 is the ultrasonic imaging that present system obtains.
Embodiment
Below by accompanying drawing and specific embodiment, the present invention is further detailed, it should be appreciated that these
Embodiment, which is only used for being described in more detail, to be used, and should not be construed as limiting the present invention to any form, that is, is not intended to
Limit the scope of the invention.
Fig. 1 is dynamic photoelasticity ultrasonic image-forming system provided in an embodiment of the present invention, as shown in figure 1, the system is included synchronously
Delayed time system 1, ultrasound emission system 2 and ultrasonic transducer 3, in addition, in addition to：Collimated light beam generation unit 4, the polarizer
5th, analyzing 6, imaging len 7 and collecting unit 8；Wherein,
Collimated light beam generation unit 4, for producing the uniform collimated light beam of light distribution.
The polarizer 5 and analyzer 6, for handling collimated light beam, obtain the light pulse signal of high s/n ratio.It is preferred that
Ground, the polarizer 5 and analyzer 6 are Glan-Taylor prism.
Imaging len 7, for the light pulse signal of reception to be imaged.Preferably, imaging len is planoconvex spotlight.
Collecting unit 8, the light pulse signal of the imaging len is passed through for multi collect, is then overlapped, realized
Ultrasonic imaging.Preferably, the collecting unit is camera.
In one example, as shown in Fig. 2 collimated light beam generation unit 4 includes pulse laser 41, beam homogenizing device
42nd, convex lens 43, diaphragm 45 and planoconvex spotlight 46.
Pulse laser 41, for emission pulse laser beam.
Beam homogenizing device 42, for the homogenizing processing of pulse laser beam, forming the light beam of even intensity.
Convex lens 43, enter line convergence for the light beam after handling homogenizing.
Diaphragm 45, for limiting convergent beam, eliminate part veiling glare.
Planoconvex spotlight 46, for being collimated to the light beam for eliminating part veiling glare, form uniform directional light.
A kind of highly sensitive dynamic photoelasticity ultrasonic image-forming system provided by the invention, the system are made using pulse laser
For light source, laser is modulated using homogenizing device, forms the diffusion light beam with uniform light distribution, then it is saturating by assembling
Mirror and diaphragm are modulated, and it is approximately the light that small light source is sent to make light beam.Light beam collimates by planoconvex spotlight again, and being formed has
The directional light of even light distribution, traditional resin polarizer then is replaced using the Glan-Taylor prism of High Extinction Ratio, improves system
System signal to noise ratio, finally utilizes the multiexposure, multiple exposure addition method to observe faint ultrasonic signal.The present invention is remarkably improved system sensitivity,
More preferable ultrasonic imaging effect is realized, and observes the faint ultrasonic field of solid interior.
Fig. 3 is dynamic photoelasticity ultrasonic imaging method schematic flow sheet provided in an embodiment of the present invention, as shown in figure 3, the party
Method comprises the following steps：
First, based on pulse laser：
S10, produce the uniform collimated light beam of light distribution.
Modulation produces the uniform parallel entrance beam of Energy distribution, and it is unfavorable to suppress light cone effect, veiling glare and aberration etc.
Factor, to optimize the beam quality of dynamic photoelasticity ultrasonic image-forming system.Including step：Transmitting, homogenizing, assemble, filter and collimate,
Specially：
S101, pulse laser emission pulse laser beam.
S102, by beam homogenizer to the homogenizing processing of pulse laser beam, form the light beam of even intensity.
S103, line convergence is entered to the light beam after homogenizing processing using convex lens.
Specifically, after the homogenizing of step S102, light beam, which turns into, has uniform light distribution, but the diffusion that area is larger
Hot spot to this diffusion hot spot, it is necessary to assemble.
S104, convergent beam is limited using diaphragm, eliminate part veiling glare.
Specifically, diaphragm is placed on to the image space of convex lens, adjusts the clear aperature of diaphragm, convergent beam is carried out
Limitation, makes its light hole turn into approximate spot light.This step can suppress light cone effect and eliminate the influence of part veiling glare.
S105, the light beam for eliminating part veiling glare is collimated using quasi- convex lens, forms uniform directional light.Plano-convex
The convex surface face directional light of lens, can reduce the aberration brought by expanding.
S20, by the polarizer and analyzer of High Extinction Ratio, obtain the light pulse signal of high s/n ratio.
Preferably, traditional resin polarizer is replaced using the Glan-Taylor prism of High Extinction Ratio, improves system signal noise ratio.
The polarization direction of two prisms is orthogonal, is placed in transparent sample both sides.It is referred to as the polarizer before sample, behind sample
Be referred to as analyzer.When not having ultrasonic in sample, light does not pass through analyzer.When having ultrasonic in sample, light beam it is inclined
Direction generation of shaking changes, and vertical component carries ultrasound information and passes through analyzer.
S30, imaging len receive the light pulse signal, it are imaged.
Preferably, the imaging len is planoconvex spotlight.
S40, the light pulse signal of imaging len, is then overlapped described in collecting unit multi collect, realizes ultrasound
Imaging.
Specifically, collecting unit is camera.At this stage, camera is arranged to time exposure, to gather multiple light pulse
Signal, strengthen signal energy, observe Weak Ultrasonic signal.
Embodiment 1
The homogenizing and imaging effect of the embodiment checking present invention, to obtain the bigger visual field in this, to better illustrate
Problem, the polarizer and analyzer still use traditional resin polarizer.Light source used in system is nanosecond pulse laser, transmitting
Green glow, spatial model are multimode, show as multiple specks.Fig. 1 is refer to, synchronizing relay system is sent out to ultrasound emission system first
Trigger signal is sent, ultrasound emission system sends electric impulse signal (voltage 1000V) excitation ultrasonic transducer and produces ultrasound, and in glass
(sample is not limited to glass, or other transparent solids herein) is propagated in glass.Transonic for a period of time after, synchronizing relay system
Unite and send trigger signal to laser, laser emission pulse laser, turn into diffusion hot spot (according to actual need by frosted glass
Ask, frosted glass can be single or multiple lift, or other homogenize device).Diffused ray planoconvex lens is assembled (according to actual need
Ask, or convex lens group).Diaphragm is modulated to the light beam of convergence, and its light hole turns into approximate spot light.Approximate spot light
The collimated lens of light beam sent turn into major diameter directional light.Collimation lens is planoconvex spotlight, convex surface face directional light, can be subtracted
It is small by expanding caused aberration.Fig. 5 is refer to, the figure is the light spot image after homogenizing, and it is uniform empty to show that collimated light beam has
Between Energy distribution.Directional light turns into polarised light through the polarizer, and when propagating in glass, the temporary birefrigent caused by ultrasound is imitated
Should, deviation occurs for polarization direction, and inside glass ultrasound information is carried through the light beam after glass.The polarization direction of analyzer with
The polarizer is vertical, only passes through the component perpendicular to incident polarization light direction.Light beam imaged lens again, are received by camera.Fig. 6
Provide the ultrasonic longitudinal wave pulse diagram picture that a width industrial camera photographs.
Thus, it can be known that the present invention can form the directional light with uniform light distribution.
Embodiment 2
The high sensitivity of the present embodiment checking present invention and the ability for observing faint sound field.By the tree in the system of embodiment 1
Fat polarizer replaces with Glan-Taylor prism, then turns down the voltage of ultrasonic excitation signal to 10V by 1000V, now ultrasonic
Energy becomes extremely faint.As shown in fig. 7, being the image collected using primary resin polarizer, there was only noise speckle in figure,
Ultrasonic signal can not be told.Fig. 8 show the image collected using the present invention program, can clearly tell ultrasonic bar
Line.It should be noted that because the clear aperature of Glan-Taylor prism limits, striped captured by Fig. 8 is only one in Fig. 6 visuals field
Part.
Thus, it can be known that the present invention is remarkably improved system sensitivity, more preferable ultrasonic imaging effect is realized, and observe solid
Internal faint sound field.
Professional should further appreciate that, each example described with reference to the embodiments described herein
Unit and algorithm steps, it can be realized with electronic hardware, computer software or the combination of the two, it is hard in order to clearly demonstrate
The interchangeability of part and software, the composition and step of each example are generally described according to function in the above description.
These functions are performed with hardware or software mode actually, application-specific and design constraint depending on technical scheme.
Professional and technical personnel can realize described function using distinct methods to each specific application, but this realization
It is it is not considered that beyond the scope of this invention.
The method that is described with reference to the embodiments described herein can use hardware, computing device the step of algorithm
Software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), internal memory, read-only storage
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described embodiment, the purpose, technical scheme and beneficial effect of the application are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the application, be not used to limit the application
Protection domain, all any modification, equivalent substitution and improvements within spirit herein and principle, done etc., all should include
Within the protection domain of the application.
Claims (6)
1. a kind of dynamic photoelasticity ultrasonic image-forming system, including synchronizing relay system, ultrasound emission system and ultrasonic transducer, it is special
Sign is, in addition to：Collimated light beam generation unit, the polarizer, sample placement point, analyzer, imaging len and collecting unit；Its
In, the sample placement point, between the polarizer and the analyzer, for placing observing samples；
The collimated light beam generation unit, for producing the uniform collimated light beam of light distribution；
The polarizer and analyzer, for handling collimated light beam, obtain the light pulse signal of high s/n ratio；
The imaging len, for the light pulse signal of reception to be imaged；
The collecting unit, the light pulse signal of the imaging len is passed through for multi collect, is then overlapped, realized super
Acoustic imaging.
2. dynamic photoelasticity ultrasonic image-forming system according to claim 1, it is characterised in that the directional light generation unit bag
Include pulse laser, beam homogenizing device, convex lens, diaphragm and planoconvex spotlight；
The pulse laser, for emission pulse laser beam；
The beam homogenizing device, for the homogenizing processing of pulse laser beam, forming the light beam of even intensity；
The convex lens, enter line convergence for the light beam after handling homogenizing；
The diaphragm, for limiting convergent beam, eliminate part veiling glare；
The planoconvex spotlight, for being collimated to the light beam for eliminating part veiling glare, form uniform directional light.
3. dynamic photoelasticity ultrasonic image-forming system according to claim 1, it is characterised in that the polarizer and analyzing utensil
Body is Glan-Taylor prism.
4. a kind of dynamic photoelasticity ultrasonic imaging method, it is characterised in that methods described includes：
Produce the uniform collimated light beam of light distribution；
By the polarizer and analyzer of High Extinction Ratio, the light pulse signal of high s/n ratio is obtained；
Imaging len receives the light pulse signal, and it is imaged；
The light pulse signal of imaging len described in multi collect, is then overlapped, and realizes ultrasonic imaging.
5. dynamic photoelasticity ultrasonic imaging method according to claim 4, it is characterised in that the generation light distribution is uniform
Collimated light beam, be specially：
Pulse laser emission pulse laser beam；
By beam homogenizer to the homogenizing processing of pulse laser beam, the light beam of even intensity is formed；
Line convergence is entered to the light beam after homogenizing processing using convex lens；
Convergent beam is limited using diaphragm, eliminates part veiling glare；
The light beam for eliminating part veiling glare is collimated using quasi- convex lens, forms uniform directional light.
6. dynamic photoelasticity ultrasonic imaging method according to claim 4, it is characterised in that the polarizer of the High Extinction Ratio
It is specially Glan-Taylor prism with analyzer.
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Cited By (3)
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| CN108106714A (en) * | 2018-01-24 | 2018-06-01 | 中国科学院声学研究所 | The dynamic photoelasticity ultrasonic quantitative measuring device and method of a kind of high stability |
| CN111795921A (en) * | 2020-07-14 | 2020-10-20 | 南京理工大学 | Particle counter sensor beam homogenization and sharpening illumination system |
| CN112781520A (en) * | 2019-11-06 | 2021-05-11 | 奇景光电股份有限公司 | Structured light imaging device |
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