CN108106714A - The dynamic photoelasticity ultrasonic quantitative measuring device and method of a kind of high stability - Google Patents
The dynamic photoelasticity ultrasonic quantitative measuring device and method of a kind of high stability Download PDFInfo
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- CN108106714A CN108106714A CN201810068893.1A CN201810068893A CN108106714A CN 108106714 A CN108106714 A CN 108106714A CN 201810068893 A CN201810068893 A CN 201810068893A CN 108106714 A CN108106714 A CN 108106714A
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- linear polarization
- stress
- analyzer
- ultrasonic
- optical axis
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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
Abstract
The present invention relates to a kind of dynamic photoelasticity ultrasonic quantitative measuring device of high stability, including：Synchronizing relay system, laser, frosted glass, ultrasound emission system, ultrasonic transducer and camera, further include linear polarization system；Synchronizing relay system connecting laser and ultrasound emission system, laser injects light into frosted glass, and after frosted glass reflects incident ray, by linear polarization system, last light enters camera.In practical applications, it is remarkably improved the stability of system ultrasonic quantitative measurement.
Description
Technical field
The present invention relates to the quantitative measurment of ultrasonic sound field, the dynamic photoelasticity ultrasonic quantitative of more particularly to a kind of high stability is surveyed
Measure 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 of great significance.In document《The scattering of ultrasound in solids》In, describe a kind of dynamic laser light
Play supersonic imaging apparatus, and the method for discussing ultrasonic sound field in quantitative measurment transparent solid.
Most of ultrasound stress method for quantitative measuring all has certain limitation, is only capable of the sound stress of measurement surface, for
Solid interior sound field method for quantitative measuring only has photoelastic experiment method at present.However, existing photoelastic method for quantitative measuring is in text
It offers《Photoelasticity principle and measuring technology》With《The photoelastic method quantitative measurement of sound stress in transparent solid》In be described, with penalty method
Based on, i.e., artificial one known phase of manufacture is poor, is offseted with the unknown phase potential difference of measured point, so as to obtain the phase of measuring point
Difference, but this method exist adjust, interpretation process it is inaccurate, it is difficult to the problem of accurate and steadily quantitative measurment.
Phase difference caused by needing to accurately measure stress in quantitative measurment experiment, therefore to the standard of analyzer rotation angle
Determine that position is of great significance for the accuracy of measurement result.If direct manual rotation mirror holder, visually reads, will bring very
Big error.The present invention devises electronic rotation mirror holder, uses step motor control, and resolution ratio is 0.01 °, absolute fix essence
Degree is up to 0.02 °.The rotation of mirror holder and the acquisition of camera are controlled by software, one angle of analyzer is often rotated, measures simultaneously
The light intensity of the point after 180 ° of rotation, can draw the change curve of a cycle.Then rotated according to formula output intensity and analyzer
The expression formula of angle, is fitted experimental measurements, by the curve after fitting come interpretation phase difference value, can obtain higher
Quantitative measurment precision, and with higher stability.
The content of the invention
The purpose of the present invention is providing a kind of dynamic photoelasticity ultrasonic quantitative measuring method of high stability and system, with to solid
The ultrasonic sound field in internal portion carries out accurately quantitative measurment.
To achieve the above object, on the one hand, the present invention provides a kind of dynamic photoelasticity ultrasonic quantitative measurements of high stability
Device, including：Synchronizing relay system, laser, frosted glass, ultrasound emission system, ultrasonic transducer and camera, further include line
Polarized systems；Synchronizing relay system connecting laser and ultrasound emission system, laser inject light into frosted glass, and frosted glass will enter
After penetrating light refraction, by linear polarization system, last light enters camera.
Preferably, linear polarization system specifically includes：Collimation lens, the polarizer, analyzer and imaging len.
Preferably, by linear polarization system, it is specially：Pass sequentially through collimation lens, the polarizer, sample, analyzer and into
As lens.
Preferably, the polarizer and analyzer are connected with automatically controlled rotation mirror holder.
Preferably, linear polarization system and measurement point principal direction of stress are 45 °.
On the other hand, the present invention also provides a kind of dynamic photoelasticity ultrasonic quantitative measuring method of high stability, including with
Lower step：Step 1：When polarization axle is overlapped with measurement point principal direction of stress, the delustring, therefore principal direction of stress can be obtained；
Step 2：Quarter-wave plate is placed, it is consistent with linear polarization systematic optical axis to adjust its optical axis, by rotating quarter-wave plate,
It determines light intensity maximum point, is the quarter-wave plate optical axis point consistent with linear polarization systematic optical axis；Step 3：Rotate analyzer
Angle beta, it is at zero point, so that it is determined that Retardation Δ caused by sample to be tested sound stress to obtain measuring point light intensity.
Preferably, linear polarization system and measurement point principal direction of stress are 45 °.
Present invention has the advantages that in practical applications, it is remarkably improved the stability of system ultrasonic quantitative measurement.
Description of the drawings
Fig. 1 is a kind of dynamic photoelasticity ultrasonic quantitative measuring device schematic diagram of high stability provided in an embodiment of the present invention；
Fig. 2 is the radiated sound field schematic diagram of ultrasonic transducer；
Fig. 3 is rotational line polarization axle and light intensity value coordinate schematic diagram；
Fig. 4 is analyzer rotation angle and light intensity coordinate schematic diagram.
Specific embodiment
Below by drawings and examples, technical scheme is described in further detail.
The present embodiment verifies the high stability of quantitative measurment of the present invention.For certain in a measurement longitudinal wave energy converter radiated sound field
The example of point principal stress size.
Fig. 1 is a kind of dynamic photoelasticity ultrasonic quantitative measuring device schematic diagram of high stability provided in an embodiment of the present invention.
As shown in Figure 1, a kind of dynamic photoelasticity ultrasonic quantitative measuring device of high stability, including：Synchronizing relay system swashs
Light device, frosted glass, ultrasound emission system, ultrasonic transducer, collimation lens, the polarizer, analyzer, imaging len and camera.
Synchronizing relay system connecting laser and ultrasound emission system, laser inject light into frosted glass, and frosted glass will enter
After penetrating light refraction, collimation lens, the polarizer, sample, analyzer and imaging len are passed sequentially through, last light enters camera.
The polarizer and analyzer are connected with automatically controlled rotation mirror holder, and collectively form linear polarization system.Linear polarization system with
Measurement point principal direction of stress is 45 °.
On the other hand, the present invention also provides a kind of dynamic photoelasticity ultrasonic quantitative measuring method of high stability, including following
Step：Step 1：When polarization axle is overlapped with measurement point principal direction of stress, the delustring, therefore principal direction of stress can be obtained；Step
Rapid two：Quarter-wave plate is placed, it is consistent with linear polarization systematic optical axis to adjust its optical axis, by rotating quarter-wave plate, really
Determine light intensity maximum point, be the quarter-wave plate optical axis point consistent with linear polarization systematic optical axis；Step 3：Rotate analyzer angle
β is spent, it is at zero point, so that it is determined that Retardation Δ caused by sample to be tested sound stress to obtain measuring point light intensity.
Fig. 2 is the radiated sound field schematic diagram of ultrasonic transducer.
Photoelastic image is as shown in Fig. 2, ultrasonic transducer is placed in sample top, downward radiation sound wave.The most bright striped in lower section
For longitudinal wave, striped below is edge shear wave.Institute's measuring point is marked with "+" in experiment, and the sound wave of the point is regarded as plane longitudinal wave,
The principal stress size in transonic direction is acquired easily by deviator stress, correlation technique can refer to the prior art, herein no longer
It repeats.It rotates the situation of the polarizer and analyzer simultaneously first, and records the light intensity value of measuring point automatically with the variation of rotation angle
Curve.
Fig. 3 is rotational line polarization axle and light intensity value coordinate schematic diagram.
Fig. 4 is analyzer rotation angle and light intensity coordinate schematic diagram.
As shown in figure 3, the curve shows extinction point at 62 °, we rotate -45 ° of the polarizer and analyzer simultaneously again, from
And so that linear polarization system and measuring point principal direction of stress are at 45 °.Quarter-wave plate is placed, is operated according to step 2, adjustment four
The optical axis of/mono- wave plate is consistent with linear polarization systematic optical axis.Then, analyzer is only rotated, can obtain a definite principal stress
The curve in direction, and the phase difference to selecting measuring point carries out 10 independent duplicate measurements, each measurement result is by foregoing
Automatic distinguishing method obtains, and experimental data and matched curve are as shown in Figure 4.What it is due to light source transmitting is monochromatic light, can use camera
The image intensity value of acquisition represents relative light intensity value.What it is due to camera acquisition is 8 bit images, maximum gradation value 255, because
There is flat-top phenomenon in this experimental data.What it is in view of our interpretations is minimum gray value, and flat-top will not generate shadow to measurement result
It rings.It is 25.78 ° (phase difference caused by stress is 2 times of β, i.e., 55.16 °) to measure for 10 times and to obtain the average value of β, relative standard
Deviation is 0.91%, it was demonstrated that experimental system and measuring method have higher stability.
The stress optical coefficient of laboratory sample (K9 glass) is 2.7 × 10-12/ Pa, thickness 3cm, k9 glass optical wavelength are
The refractive index of 532nm, K9 glassDeviator stress is：
Δ σ=λ α/(360Bdne)=0.663MPa
Principal stress size on longitudinal wave propagation direction is 0.91MPa.
Above-described specific embodiment has carried out the purpose of the present invention, technical solution and advantageous effect further
It is described in detail, it should be understood that the foregoing is merely the specific embodiments of the present invention, is not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of dynamic photoelasticity ultrasonic quantitative measuring device of high stability, including：Synchronizing relay system, laser, frosted glass,
Ultrasound emission system, ultrasonic transducer and camera, which is characterized in that further include linear polarization system；
The synchronizing relay system connects the laser and the ultrasound emission system, the laser inject light into the hair
Glass, after the frosted glass reflects incident ray, by the linear polarization system, last light enters the camera.
2. the apparatus according to claim 1, which is characterized in that the linear polarization system specifically includes：Collimation lens rises
Inclined device, analyzer and imaging len.
3. the apparatus according to claim 1, which is characterized in that it is described by the linear polarization system, be specially：Lead to successively
Cross the collimation lens, the polarizer, sample, the analyzer and the imaging len.
4. the apparatus of claim 2, which is characterized in that the polarizer and the analyzer and automatically controlled rotation mirror holder
It is connected.
5. the apparatus according to claim 1, which is characterized in that the linear polarization system is with measurement point principal direction of stress
45°。
6. the dynamic photoelasticity ultrasonic quantitative measuring method of a kind of high stability, which is characterized in that comprise the following steps：
Step 1：When polarization axle is overlapped with measurement point principal direction of stress, the delustring, therefore principal direction of stress can be obtained；
Step 2：Quarter-wave plate is placed, it is consistent with linear polarization systematic optical axis to adjust its optical axis, by rotating quarter-wave
Piece determines light intensity maximum point, is the quarter-wave plate optical axis point consistent with linear polarization systematic optical axis；
Step 3：Analyzer angle beta is rotated, it is at zero point, so that it is determined that caused by sample to be tested sound stress to obtain measuring point light intensity
Retardation Δ.
7. according to the method described in claim 6, it is characterized in that, the linear polarization system is with measurement point principal direction of stress
45°。
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| CN201810068893.1A CN108106714A (en) | 2018-01-24 | 2018-01-24 | The dynamic photoelasticity ultrasonic quantitative measuring device and method of a kind of high stability |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579971A (en) * | 2018-10-17 | 2019-04-05 | 中国科学院声学研究所 | A kind of system and method carrying out ultrasonic quantitative measurement using laser doppler |
| CN110530499A (en) * | 2019-08-27 | 2019-12-03 | 中国科学院声学研究所 | A method of acoustic propagation direction in measurement dynamic photoelasticity image |
| CN110595600A (en) * | 2019-08-21 | 2019-12-20 | 南京理工大学 | Video frame rate sound field visualization system and method based on polarization parameter imaging |
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| CN101936773A (en) * | 2010-09-08 | 2011-01-05 | 北京航空航天大学 | Computer-aided-based high-precision polarized light positioning system and high-precision positioning method |
| CN104614063A (en) * | 2015-02-04 | 2015-05-13 | 华中科技大学 | Visualization device for ultrasonic transmission process |
| CN105675186A (en) * | 2016-01-26 | 2016-06-15 | 中国科学院声学研究所 | Stress measuring method based on dynamic photoelastic system |
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| CN101936773A (en) * | 2010-09-08 | 2011-01-05 | 北京航空航天大学 | Computer-aided-based high-precision polarized light positioning system and high-precision positioning method |
| CN104614063A (en) * | 2015-02-04 | 2015-05-13 | 华中科技大学 | Visualization device for ultrasonic transmission process |
| CN105675186A (en) * | 2016-01-26 | 2016-06-15 | 中国科学院声学研究所 | Stress measuring method based on dynamic photoelastic system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579971A (en) * | 2018-10-17 | 2019-04-05 | 中国科学院声学研究所 | A kind of system and method carrying out ultrasonic quantitative measurement using laser doppler |
| CN109579971B (en) * | 2018-10-17 | 2020-08-04 | 中国科学院声学研究所 | System and method for ultrasonic quantitative measurement by using laser Doppler effect |
| CN110595600A (en) * | 2019-08-21 | 2019-12-20 | 南京理工大学 | Video frame rate sound field visualization system and method based on polarization parameter imaging |
| CN110595600B (en) * | 2019-08-21 | 2022-03-22 | 南京理工大学 | Video frame rate sound field visualization system and method based on polarization parameter imaging |
| CN110530499A (en) * | 2019-08-27 | 2019-12-03 | 中国科学院声学研究所 | A method of acoustic propagation direction in measurement dynamic photoelasticity image |
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Application publication date: 20180601 |