CN109612940A - A kind of nondestructive detection system and lossless detection method that laser array quickly controls generation ultrasound - Google Patents
A kind of nondestructive detection system and lossless detection method that laser array quickly controls generation ultrasound Download PDFInfo
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- CN109612940A CN109612940A CN201811477197.2A CN201811477197A CN109612940A CN 109612940 A CN109612940 A CN 109612940A CN 201811477197 A CN201811477197 A CN 201811477197A CN 109612940 A CN109612940 A CN 109612940A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1706—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in solids
Abstract
The invention discloses nondestructive detection systems and lossless detection method that a kind of laser array quickly controls generation ultrasound, system includes laser generator, laser transmission apparatus, ultrasonic detection device, multichannel analog-to-digital conversion equipment and controller, the laser that laser generator issues is irradiated to sample to be tested surface by laser transmission apparatus, ultrasonic wave is generated under Thermoelastic regime, the ultrasonic wave propagated in sample to be tested is detected by ultrasonic detection device, and the information of sample to be tested is transferred to controller through multichannel analog-to-digital conversion equipment, tested initial characteristics information is analyzed, and feedback adjustment switched laser transmitting device, realize the precise measurement that feature is detected in sample to be tested.The present invention quickly adjusts ultrasonic wave in the intensity for pinpointing and (or) orienting, increases substantially the signal-to-noise ratio and detectability of Laser-Ultrasonic Nondestructive Testing System according to the tested characteristic information detected, promotes the efficiency that tested feature accurately detects.
Description
Technical field
The invention belongs to field of non destructive testing, quickly control more particularly to a kind of laser array generation ultrasound lossless
Detection system and lossless detection method.
Background technique
In current field of non destructive testing, ultrasound detection is mostly important one of method, is widely used in all kinds of heavy
It wants in the safety detection of device structure.The mode of excitation of ultrasonic wave can be divided into piezoelectric supersonic method, electromagnetic acoustic method and swash in structure
Light ultrasonic method.Wherein piezoelectric supersonic needs to pop one's head in and contacts and needed using fluid couplant with test specimen, although electromagnetic acoustic
It does not need to contact with test specimen but spacing distance very little；And laser-ultrasound has due to using laser pumping and detection ultrasonic wave
There is remote, non-contact and high-resolution, is just more and more being weighed in industrial circles such as non-destructive testings at present
Depending on.
However ultrasonic wave bulk wave (longitudinal wave and shear wave) weaker, system that single-point laser is excited in the structure under Thermoelastic regime
Noise it is relatively low, be unfavorable for being detected inside configuration the detection of feature, thus it is necessary to pass through phased array laser excitation
The methods of to enhance ultrasonic intensity to realize the detection of internal tested feature.But presently, there are array laser method it is more
It is that enhancing is oriented to ultrasonic wave by single fiber array, system is excessively single to the beam steering ability of ultrasonic wave,
Feature can not being detected according to sample and quickly adjusting ultrasonic wave, during actual detection, detection accuracy will receive to be limited to a certain degree
System.
Summary of the invention
Goal of the invention: to solve the problem in above-mentioned existing application and technology, a kind of laser array pair is provided
Nondestructive detection system and lossless detection method that ultrasound quickly controls are generated, according to the tested characteristic information detected, fast velocity modulation
Ultrasonic wave is saved in the intensity for pinpointing and orienting, increases substantially the signal-to-noise ratio and detectability of Laser-Ultrasonic Nondestructive Testing System,
Promote the efficiency that tested feature accurately detects.
Technical solution: in order to achieve the above-mentioned object of the invention, present invention employs following technical solutions:
A kind of nondestructive detection system that laser array quickly controls generation ultrasound, including the transmission of laser generator, laser
Device, ultrasonic detection device, multichannel analog-to-digital conversion equipment and controller, the laser that laser generator issues pass through laser
Defeated device is irradiated to sample to be tested surface, generates ultrasonic wave under Thermoelastic regime, and the ultrasonic wave propagated in sample to be tested is by surpassing
Acoustic detector detection, and the information of sample to be tested is transferred to controller through multichannel analog-to-digital conversion equipment, to tested first
Beginning characteristic information is analyzed, and feedback adjustment switched laser transmitting device, realizes the accurate survey that feature is detected in sample to be tested
Amount.
Optionally, laser transmission apparatus includes convex lens, the conversion equipment of fiber coupler, fibre coupler arrays, light
Fibre array and focusing lens array, fibre coupler arrays are mounted on the conversion equipment of fiber coupler comprising at least two
A fiber coupler；Fiber array at least two, focusing lens array include at least two condenser lenses；And fiber coupler,
Fiber array and condenser lens correspond, and the laser that laser generator issues focuses on fiber coupler by convex lens,
Then after fiber array transmits again line focus lens lighting on sample to be tested surface.
Optionally, the conversion equipment of fiber coupler is a kind of ± 180 ° of converter apparatus rotated coaxially, is turned every time
Dynamic angle is depending on the particular number for the fiber coupler installed, if there is n fiber coupler, the angle rotated every time
Degree is the integral multiple of 2 π, and the conversion equipment of fiber coupler connects controller automatic conversion or converted manually.
n
Optionally, the optical fiber number and distance and the length of optical fiber for the fiber array that each fiber coupler is connected are taken
With same or different.
Optionally, nondestructive detection system further includes automatically controlled displacement platform and the first stepper motor, and sample to be tested is placed on automatically controlled
On displacement platform, the first stepper motor is connect with controller, and controller controls the rotation of the first stepper motor, further passes through control electricity
Control displacement platform is mobile to control sample to be tested.
Optionally, nondestructive detection system further includes second stepper motor, the conversion of second stepper motor and fiber coupler
Device connection, the ultrasonic wave propagated in sample to be tested are detected by ultrasonic detection device and by the information of sample to be tested through multi-pass
Road analog-to-digital conversion equipment is transferred to controller, obtains tested initial characteristics information；Controller controls second stepper motor to adjust
The conversion equipment of upconversion fiber coupler chooses the fiber coupler of corresponding fiber array, so that the ultrasonic wave generated is fixed
The intensity of point or orientation is improved, and realizes the precise measurement that feature is detected in sample to be tested.
In another embodiment of the present invention, a kind of non-destructive testing side that laser array quickly controls generation ultrasound is additionally provided
Method, comprising the following steps:
(1) laser is made to motivate ultrasonic wave, ultrasonic wave inspection in sample to be tested by the fiber coupler of initial setting up first
The ultrasonic signal for surveying device detection is transferred to controller through multichannel analog-to-digital conversion equipment；
(2) controller handle simultaneously display waveform to by ultrasonic signal, and analyses whether the quilt containing sample to be tested
Characteristic information is examined, sample to be tested is moved if not and continues to scan on；If so, then according to the tested initial characteristics of sample to be tested
Information determines suitable fiber array；
(3) it is adjusted using fiber coupler conversion equipment, selects suitable fiber coupler and fiber array, and make
Exciting laser focuses on corresponding fiber array and forms laser array pair；The tested initial characteristics information of sample to be tested is determined
The ultrasound-enhanced of point or orientation；
(4) the enhanced tested characteristic information of ultrasonic detection device detection is transferred to through multichannel analog-to-digital conversion equipment
Controller is analyzed and processed；
(5) whether controller analysis sample to be tested is all scanned, if all scanning, system are completed and terminate work
Make；If, by mobile sample to be tested, carrying out flat scanning to sample to be tested, and repeat step (1)-without whole scannings
(5), realization is to the position of feature tested in sample to be tested, the precise measurement of shape and size.
Further, suitable fiber array is determined according to the tested initial characteristics information of sample to be tested in step (2)
Method are as follows:
Using the tested initial characteristics information of prior art analysis sample to be tested, by the position of tested feature, shape and ruler
The very little position for enhancing point or the orientation enhancing direction of pinpointing with fiber array is gone to match, and finds best match optical fiber possessed by system
Array, matching rule are to select immediate fiber array.
Further, the tool of fixed point ultrasound-enhanced is carried out in step (3) to the tested initial characteristics information of sample to be tested
Body method are as follows: first determine supersonic source of the location point for needing to enhance ultrasonic intensity relative to laser irradiation on sample to be tested surface
Distance and angle, then by calculate fiber array needed for fiber lengths make fiber array each fiber-optic illuminated on sample
Generated ultrasonic wave wavefront is put in the position while being reached, and realizes ultrasonic wave in the relevant enhancing for determining location point；It calculates public
Formula are as follows:
If optical fiber array shows m optical fiber, length is respectively Li(1≤i≤m), corresponding illuminated laser spot are ultrasound
It is respectively D that wave, which generates point and needs to enhance the distance of the location point of ultrasonic intensity,i(1≤i≤m), then:
Wherein, 1≤i≤m-1, c are the spread speed of laser in a fiber, and v is ultrasonic wave wave mode used in sample to be tested
Spread speed.
Further, the tool of ultrasound-enhanced is oriented in step (3) to the tested initial characteristics information of sample to be tested
Body method are as follows: first determine the supersonic source for needing to enhance the direction of ultrasonic intensity relative to laser irradiation on sample to be tested surface
Then angle makes fiber array is each fiber-optic illuminated to be produced on sample to be tested by fiber lengths needed for calculating fiber array
Raw ultrasonic wave wavefront reaches simultaneously in the vertical plane of the direction, realizes ultrasonic wave in the relevant enhancing for determining direction；It calculates
Formula are as follows:
If optical fiber array shows m optical fiber, length is respectively Li(1≤i≤m), corresponding illuminated laser spot are ultrasound
It is respectively S that wave, which generates point and needs to enhance the distance of a certain vertical plane in the direction of ultrasonic intensity,i(1≤i≤m), then:
Wherein, 1≤i≤m-1, c are the spread speed of laser in a fiber, and v is ultrasonic wave wave mode used in sample to be tested
Spread speed.
The utility model has the advantages that compared with prior art, the invention has the following advantages that
For the present invention in test sample, the tested feature general information fed back by detection device utilizes fiber coupler
Converter apparatus can quickly adjust the fiber array for making laser focus on required length collocation, it is real to the ultrasonic wave of generation
The now raising of fixed point or directional intensity is realized the precise measurement for being detected feature locations, shape and size in sample, and can be led to
Mobile example is crossed, realizes the flat scanning of sample, increases substantially the signal-to-noise ratio and detection energy of Laser-Ultrasonic Nondestructive Testing System
Power promotes the efficiency that tested feature accurately detects.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of present system；
Fig. 2 is the schematic diagram that fixed point enhancing laser generates ultrasonic wave；
Fig. 3 is the schematic diagram that orientation enhancing laser generates ultrasonic wave；
Fig. 4 is detection method flow chart of steps.
Specific embodiment
For a further understanding of the present invention, one embodiment of the invention is described below, but it is to be understood that these
Description is only further explanation the features and advantages of the present invention, rather than limiting to the claimed invention.Implement below
The explanation of example is merely used to help understand method and its core concept of the invention.It should be pointed out that for the general of the art
, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for logical technical staff, this
A little improvement and modification are also fallen within the protection scope of the claims of the present invention.
A kind of nondestructive detection system that laser array quickly controls generation ultrasound, including the transmission of laser generator, laser
Device, ultrasonic detection device, multichannel analog-to-digital conversion equipment and controller, the laser that laser generator issues pass through laser
Defeated device is irradiated to sample to be tested surface, generates ultrasonic wave under Thermoelastic regime, and the ultrasonic wave propagated in sample to be tested is by surpassing
Acoustic detector detection, and the information of sample to be tested is transferred to controller through multichannel analog-to-digital conversion equipment, to tested first
Beginning characteristic information is analyzed, and feedback adjustment switched laser transmitting device, realizes the accurate survey that feature is detected in sample to be tested
Amount.
Laser transmission apparatus include convex lens, the conversion equipment of fiber coupler, fibre coupler arrays, fiber array and
Focusing lens array, fibre coupler arrays are mounted on the conversion equipment of fiber coupler comprising at least two optical fiber couplings
Clutch；Fiber array at least two, focusing lens array include at least two condenser lenses；And fiber coupler, fiber array
It is corresponded with condenser lens, the laser that laser generator issues focuses on fiber coupler by convex lens, then through light
Fibre array transmission after again line focus lens lighting on sample to be tested surface.
Ultrasonic detection device can be interferometer, be also possible to piezoelectric ceramics probe, the ultrasonic wave letter detected
Number it is input to multichannel analog-to-digital conversion equipment, and multichannel analog-to-digital conversion equipment is connected to a computer, shown in many ways
Oscillography shape.According to shown waveform, analyses whether the tested characteristic information containing sample to be tested, moved if not to be measured
Sample continues to scan on；If so, then utilizing optical fiber according to the approximate location and direction (tested initial characteristics information) for being detected feature
The conversion equipment of coupler can quickly select suitable fiber array, and known tested initial characteristics information is pinpointed and determined
To ultrasound-enhanced, further increase detection device and obtain the signal-to-noise ratio of ultrasonic signal, improve tested for sample to be tested
The detection precision of feature.
The conversion equipment of fiber coupler is a kind of ± 180 ° of converter apparatus rotated coaxially, the angle rotated every time
Depending on the particular number for the fiber coupler installed, if there is n fiber coupler, the angle rotated every time is
Integral multiple, and the conversion equipment connection of fiber coupler or is converted controller automatic conversion manually.
The optical fiber number and distance of the fiber array that each fiber coupler is connected and the collocation of the length of optical fiber can be with
It is identical can be different, specific value need according to the required measurement accuracy of practical sample to be tested shape and size and detection and
Setting.The length collocation of the optical fiber for the fiber array that each fiber coupler is connected can be set according to two methods in advance
It sets to realize to the ultrasonic wave fixed point of generation or the raising of directional intensity, specifically:
First method first determines the location point for needing to enhance ultrasonic intensity relative to laser irradiation in sample to be tested table
Then the distance and angle of the supersonic source in face make array each fiber-optic illuminated to be measured by fiber lengths needed for computing array
Generated ultrasonic wave wavefront is put in the position while being reached on sample, realizes ultrasonic wave in the relevant enhancing for determining location point.
Second method first determines the direction for needing to enhance ultrasonic intensity relative to laser irradiation on sample to be tested surface
Supersonic source angle, then make each fiber-optic illuminated institute on sample to be tested of array by fiber lengths needed for computing array
The ultrasonic wave wavefront of generation reaches simultaneously in the vertical plane of the direction, realizes ultrasonic wave in the relevant enhancing for determining direction.
Nondestructive detection system further includes automatically controlled displacement platform and the first stepper motor, and sample to be tested is placed on automatically controlled displacement platform
On, the first stepper motor is connect with controller, and controller controls the rotation of the first stepper motor, further by controlling automatically controlled displacement
Platform is mobile to control sample to be tested.
Nondestructive detection system further includes second stepper motor, the conversion equipment company of second stepper motor and fiber coupler
It connects, controller controls second stepper motor to adjust the conversion equipment of upconversion fiber coupler, chooses corresponding fiber array
Fiber coupler is realized so that the ultrasonic wave generated is improved in the intensity for pinpointing or orienting and is detected feature in sample to be tested
Precise measurement.
Embodiment:
As shown in Figure 1, in one embodiment of the invention, providing a kind of quickly control ultrasonic to generation of laser array
Nondestructive detection system, including pulse laser 1, convex lens 2, the converter apparatus 3 of fiber coupler, fiber coupler 4, light
Fibre array 5, condenser lens 6, sample to be tested 7, automatically controlled displacement platform 8, ultrasonic detection device 9, multichannel analog-to-digital conversion equipment 10,
Computer 11, the first stepper motor 12 and second stepper motor 13.
When nondestructive detection system in the present embodiment works, a bundle of pulsed laser is issued by pulse laser 1, by convex lens
Mirror 2 is by the fiber coupler 4 on the converter apparatus 3 of pulse laser focusing to fiber coupler, by the length of initial setting up
The fiber array 5 of collocation is propagated, so that pulse laser is radiated at 7 surface of sample to be tested from each optical fiber line focus lens 6, and
Ultrasonic wave is generated under Thermoelastic regime, the ultrasonic wave propagated in sample to be tested 7 is detected by ultrasonic detection device 9 and will be to test sample
The information of product 7 is transferred to computer 11 through multichannel analog-to-digital conversion equipment 10, realizes to tested feature approximate location and direction
Analysis, and second stepper motor 13 is further controlled come the converter apparatus 3 of upconversion fiber coupler by computer 11, it chooses
The fiber coupler 4 of corresponding fiber array 5, so that pulse laser is from outgoing time of each optical fiber of fiber array each not phase
Together, that is, the time for being radiated at 7 surface of sample to be tested is different, so that the ultrasonic wave generated is mentioned in the intensity for pinpointing or orienting
Height, the ultrasonic wave propagated in sample to be tested 7 are detected by ultrasonic detection device 9 again and pass through the information of sample to be tested 7
Multichannel analog-to-digital conversion equipment 10 is transferred to computer 11, realizes the accurate survey that feature locations, shape and size are detected in sample
Amount.In addition to this, sample to be tested 7 is placed on electronic control translation stage 8, the first stepper motor 12 and calculating under electronic control translation stage
Machine 11 is connected, to require the movement for automatically controlling sample to be tested (in addition, sample to be tested can also be moved manually according to detection
It is dynamic), it realizes flat scanning, increases substantially the signal-to-noise ratio and detectability of Laser-Ultrasonic Nondestructive Testing System, promote tested spy
Levy the speed and efficiency accurately detected.
As shown in Fig. 2, to make ultrasonic wave obtain the raising of signal strength in fixed point 16, it is necessary to generate three supersonic sources
Ultrasonic wave wavefront 15 reaches fixed point 16 simultaneously, thus need to calculate each supersonic source to fixed point distance divided by bulk wave to test sample
Then spread speed in product 7 utilizes the different fiber lengths of (after line focus lens) fiber array 5 to go the compensation time, makes
Divided by light, the shoot laser 14 after the spread speed of optical fiber adds line focus lens is radiated at sample to the length of each optical fiber of fiber array 5
The total time of generated ultrasonic wave front propagation to fixed point 16 is identical on product, i.e., ultrasonic wave wavefront reaches fixed point 16 simultaneously, real
Relevant enhancing of the existing ultrasonic wave in fixed point 16.
As shown in figure 3, wherein 18 be 7 surface normal of sample to be tested, for make ultrasonic wave orientation θ obtain mentioning for signal strength
It is high, it is necessary to the ultrasonic wave wavefront 15 for generating three supersonic sources while the vertical plane 17 for reaching orientation θ, so needing to calculate each
A supersonic source to orientation θ vertical plane 17 spread speed of the distance divided by bulk wave in sample to be tested 7, then utilize optical fiber
The different length of array 5 goes the compensation time, and the length of each optical fiber of fiber array 5 is made to add warp in the spread speed of optical fiber divided by light
After condenser lens shoot laser 14 be radiated at generated ultrasonic wave front propagation on sample to orientation θ vertical plane 17 it is total
Time is identical, i.e., ultrasonic wave wavefront reaches the vertical plane 17 for orienting θ simultaneously, realizes ultrasonic wave in the relevant enhancing of orientation θ.
As shown in figure 4, the lossless detection method that a kind of laser array quickly controls generation ultrasound, comprising the following steps:
(1) laser is made to motivate ultrasonic wave, ultrasonic wave inspection in sample to be tested by the fiber coupler of initial setting up first
The ultrasonic signal for surveying device detection is transferred to controller through multichannel analog-to-digital conversion equipment；
(2) controller handle simultaneously display waveform to tested ultrasonic signal, and analyses whether containing sample to be tested
Tested characteristic information, moves sample to be tested if not and continues to scan on；If so, then being believed according to the tested feature of sample to be tested
The approximate location of breath and direction (tested initial characteristics information), determine suitable fiber array；Method particularly includes:
Using the tested initial characteristics information of prior art analysis sample to be tested, by the position of tested feature, shape and ruler
The very little position for enhancing point or the orientation enhancing direction of pinpointing with fiber array is gone to match, and finds best match optical fiber possessed by system
Array, matching rule are to select immediate fiber array.Such as tested feature is obtained through analysis opposite in initial detecting
At the vertical surface depth 2.4cm of ultrasonic excitation point, and the position of fiber array fixed point enhancing point is vertical respectively in system
At straight case depth 2cm and at 3cm, then the fiber array of ultrasonic intensity at enhancing vertical surface depth 2cm should be chosen.
(3) it is adjusted using the conversion equipment of fiber coupler, selects suitable fiber coupler and fiber array, and
So that exciting laser is focused on corresponding fiber array and forms laser array pair；To the substantially position of the tested characteristic information of sample to be tested
Set the ultrasound-enhanced for being pinpointed or being oriented with direction (tested initial characteristics information)；
Wherein, the approximate location to the tested characteristic information of sample to be tested and direction carry out the specific of fixed point ultrasound-enhanced
Method are as follows:
First determine supersonic source of the location point for needing to enhance ultrasonic intensity relative to laser irradiation on sample to be tested surface
Distance and angle, then by calculate fiber array needed for fiber lengths make fiber array each fiber-optic illuminated on sample
Generated ultrasonic wave wavefront is put in the position while being reached, and realizes ultrasonic wave in the relevant enhancing for determining location point.If optical fiber
Array has m optical fiber, and length is respectively Li(1≤i≤m), corresponding illuminated laser spot, that is, ultrasonic wave generate point and need
The distance for enhancing the location point of ultrasonic intensity is respectively Di(1≤i≤m), then:
Wherein, 1≤i≤m-1, c are the spread speed of laser in a fiber, and v is ultrasonic wave wave mode used in sample to be tested
Spread speed.
Approximate location and direction to the tested characteristic information of sample to be tested are oriented the specific method of ultrasound-enhanced
Are as follows:
First determine the supersonic source for needing to enhance the direction of ultrasonic intensity relative to laser irradiation on sample to be tested surface
Then angle makes fiber array is each fiber-optic illuminated to be produced on sample to be tested by fiber lengths needed for calculating fiber array
Raw ultrasonic wave wavefront reaches simultaneously in the vertical plane of the direction, realizes ultrasonic wave in the relevant enhancing for determining direction.If light
Fibre array has m optical fiber, and length is respectively Li(1≤i≤m), corresponding illuminated laser spot, that is, ultrasonic wave generate point and need
The distance for enhancing a certain vertical plane in the direction of ultrasonic intensity is respectively Si(1≤i≤m), then:
Wherein, 1≤i≤m-1, c are the spread speed of laser in a fiber, and v is ultrasonic wave wave mode used in sample to be tested
Spread speed.
(4) the enhanced tested characteristic information of ultrasonic detection device detection is transferred to through multichannel analog-to-digital conversion equipment
Controller is analyzed and processed；
(5) whether controller analysis sample to be tested is all scanned, if all scanning, system are completed and terminate work
Make；If, by mobile sample to be tested, carrying out flat scanning to sample to be tested, and repeat step (1)-without whole scannings
(5), realization is to the position of feature tested in sample to be tested, the precise measurement of shape and size.
In short, the present invention is a kind of fast to generating ultrasound control and being detected feature progress to material internal using laser array
The method of fast non-destructive testing.Using a kind of converter apparatus of fiber coupler, the laser light source of ultrasonic wave will be generated according to spy
The angle or location point enhanced required for sample ultrasonic wave quickly focuses in the matched fiber array of institute, realizes ultrasonic wave
Fast beam control.Specifically, in test sample, by the fiber coupler generation ultrasonic wave of initial setting up, and according to
The tested feature general information of detection device feedback, can quickly be adjusted using the converter apparatus of fiber coupler keeps laser poly-
The fiber array that coke is arranged in pairs or groups to required length realizes the raising of fixed point or directional intensity to the ultrasonic wave of generation, realizes sample
In be detected feature locations, shape and size precise measurement.The present invention improves the detection essence of tested feature unknown for sample
Accuracy is detected feature for quick precise measurement sample and provides feasible scheme, improves in laser ultrasonic detection in real time to super
The efficiency of acoustic wave beam control, and ultrasonic wave non-contact excitation under Thermoelastic regime, to realize non-destructive testing.
Claims (10)
1. a kind of laser array is to generating the nondestructive detection system that quickly controls of ultrasound, it is characterised in that: including laser generator,
Laser transmission apparatus, ultrasonic detection device, multichannel analog-to-digital conversion equipment and controller, the laser warp that laser generator issues
It crosses laser transmission apparatus and is irradiated to sample to be tested surface, generate ultrasonic wave under Thermoelastic regime, that propagates in sample to be tested is super
Sound wave is detected by ultrasonic detection device, and the information of sample to be tested is transferred to controller through multichannel analog-to-digital conversion equipment,
Tested initial characteristics information is analyzed, and feedback adjustment switched laser transmitting device, realizes and be detected feature in sample to be tested
Precise measurement.
2. the nondestructive detection system that a kind of laser array according to claim 1 quickly controls generation ultrasound, feature
Be: laser transmission apparatus includes convex lens, the conversion equipment of fiber coupler, fibre coupler arrays, fiber array and gathers
Focus lens array, fibre coupler arrays are mounted on the conversion equipment of fiber coupler comprising at least two fiber couplings
Device；Fiber array at least two, focusing lens array include at least two condenser lenses；And fiber coupler, fiber array and
Condenser lens corresponds, and the laser that laser generator issues focuses on fiber coupler by convex lens, then through optical fiber
After Array transfer again line focus lens lighting on sample to be tested surface.
3. the nondestructive detection system that a kind of laser array according to claim 2 quickly controls generation ultrasound, feature
Be: the conversion equipment of fiber coupler is a kind of ± 180 ° of converter apparatus rotated coaxially, the angle root rotated every time
Depending on particular number according to the fiber coupler installed, if there is n fiber coupler, the angle rotated every time is's
Integral multiple, and the conversion equipment of fiber coupler connects controller automatic conversion or is converted manually.
4. the nondestructive detection system that a kind of laser array according to claim 2 quickly controls generation ultrasound, feature
Be: the optical fiber number and distance of the fiber array that each fiber coupler is connected and the collocation of the length of optical fiber it is identical or
It is different.
5. the nondestructive detection system that a kind of laser array according to claim 1 quickly controls generation ultrasound, feature
Be: nondestructive detection system further includes automatically controlled displacement platform and the first stepper motor, and sample to be tested is placed on automatically controlled displacement platform, the
One stepper motor is connect with controller, and controller controls the rotation of the first stepper motor, further by control automatically controlled displacement platform come
It is mobile to control sample to be tested.
6. the nondestructive detection system that a kind of laser array according to claim 1 quickly controls generation ultrasound, feature
Be: nondestructive detection system further includes second stepper motor, and the conversion equipment of second stepper motor and fiber coupler connects,
The ultrasonic wave propagated in sample to be tested is detected by ultrasonic detection device and by the information of sample to be tested through multichannel analog-to-digital conversion
Equipment is transferred to controller, obtains tested initial characteristics information；Controller controls second stepper motor to adjust upconversion fiber coupling
The conversion equipment of clutch chooses the fiber coupler of corresponding fiber array so that generate ultrasonic wave pinpoint or orient
Intensity is improved, and realizes the precise measurement that feature is detected in sample to be tested.
7. the lossless detection method that a kind of laser array quickly controls generation ultrasound, which comprises the following steps:
(1) laser is made to motivate ultrasonic wave, ultrasound examination dress in sample to be tested by the fiber coupler of initial setting up first
The ultrasonic signal for setting detection is transferred to controller through multichannel analog-to-digital conversion equipment；
(2) controller handle simultaneously display waveform to by ultrasonic signal, and analyses whether the tested spy containing sample to be tested
Reference breath, moves sample to be tested if not and continues to scan on；If so, then being believed according to the tested initial characteristics of sample to be tested
Breath, determines suitable fiber array；
(3) it is adjusted using fiber coupler conversion equipment, selects suitable fiber coupler and fiber array, and make to motivate
Laser focuses on corresponding fiber array and forms laser array pair；To the tested initial characteristics information of sample to be tested carry out fixed point or
The ultrasound-enhanced of orientation；
(4) the enhanced tested characteristic information of ultrasonic detection device detection is transferred to control through multichannel analog-to-digital conversion equipment
Device is analyzed and processed；
(5) whether controller analysis sample to be tested is all scanned, if all scanning, system are completed and terminate work；Such as
Fruit is without all scanning, then by mobile sample to be tested, carries out flat scanning to sample to be tested, and repeat step (1)-(5), real
Now to the precise measurement of the position of feature tested in sample to be tested, shape and size.
8. the lossless detection method that a kind of laser array according to claim 8 quickly controls generation ultrasound, feature
It is, according to the tested initial characteristics information of sample to be tested in step (2), the method for determining suitable fiber array are as follows:
Using the prior art analysis sample to be tested tested initial characteristics information, by the position of tested feature, shape and size with
The position or orientation enhancing direction of fiber array fixed point enhancing point are gone to match, and find best match optical fiber array possessed by system
Column, matching rule are to select immediate fiber array.
9. the lossless detection method that a kind of laser array according to claim 8 quickly controls generation ultrasound, feature
It is, fixed point ultrasound-enhanced is carried out to the tested initial characteristics information of sample to be tested in step (3) method particularly includes: first really
Surely need to enhance the location point of ultrasonic intensity relative to laser irradiation the supersonic source on sample to be tested surface distance and angle,
Then make each fiber-optic illuminated ultrasound generated on sample of fiber array by fiber lengths needed for calculating fiber array
Wave wavefront is put in the position while being reached, and realizes ultrasonic wave in the relevant enhancing for determining location point；Calculation formula are as follows:
If optical fiber array shows m optical fiber, length is respectively Li(1≤i≤m), corresponding illuminated laser spot, that is, ultrasonic wave generate
Putting and needing to enhance the distance of the location point of ultrasonic intensity is respectively Di(1≤i≤m), then:
Wherein, 1≤i≤m-1, c are the spread speed of laser in a fiber, and v is biography of the ultrasonic wave wave mode used in sample to be tested
Broadcast speed.
10. the lossless detection method that a kind of laser array according to claim 8 quickly controls generation ultrasound, feature
It is, ultrasound-enhanced is oriented to the tested initial characteristics information of sample to be tested in step (3) method particularly includes: first really
Surely it needs to enhance the direction of ultrasonic intensity relative to laser irradiation in the angle of the supersonic source on sample to be tested surface, then passes through
Fiber lengths needed for calculating fiber array make each fiber-optic illuminated ultrasonic wave wave generated on sample to be tested of fiber array
The preceding vertical plane in the direction reaches simultaneously, realizes ultrasonic wave in the relevant enhancing for determining direction；Calculation formula are as follows:
If optical fiber array shows m optical fiber, length is respectively Li(1≤i≤m), corresponding illuminated laser spot, that is, ultrasonic wave generate
Point and the distance of a certain vertical plane for needing to enhance the direction of ultrasonic intensity are respectively Si(1≤i≤m), then:
Wherein, 1≤i≤m-1, c are the spread speed of laser in a fiber, and v is biography of the ultrasonic wave wave mode used in sample to be tested
Broadcast speed.
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