CN103018170A - Non-contact detection method for detecting elastic parameter uniformity of material on line - Google Patents
Non-contact detection method for detecting elastic parameter uniformity of material on line Download PDFInfo
- Publication number
- CN103018170A CN103018170A CN2012104952758A CN201210495275A CN103018170A CN 103018170 A CN103018170 A CN 103018170A CN 2012104952758 A CN2012104952758 A CN 2012104952758A CN 201210495275 A CN201210495275 A CN 201210495275A CN 103018170 A CN103018170 A CN 103018170A
- Authority
- CN
- China
- Prior art keywords
- light
- real
- contact detection
- laser
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a non-contact detection method for detecting the elastic parameter uniformity of a material on line. A non-contact real-time characterization method is used for the elastic parameters of a solid material, and comprises the steps of: (1) radiating pulse laser to a spatial modulator, generating two beams of coherent light after the pulse laser passes through the spatial modulator; wherein the laser source is a nanosecond or a picosecond pulse light source, the pulse light is split through the spatial modulator consisting of gratings, and the +/- level serves as a coherent light source; (2) radiating the two beams of coherent light to the surface of the tested material and generating spatial coherent interference field by utilizing an optical component lens group, forming alternately dark and bright interference fringes on the surface of the tested material, wherein the distance between the alternately dark and bright interference fringes is acquired by adjusting the lens group or the gratings; and (3) generating sound waves of which the wavelength corresponds to the distance between the interference fringes in a thin-film material after the interference fringes formed by the pulse light source are absorbed by the thin-film material, and performing non-contact detection for characterizing and analyzing the elastic parameters of the solid sample.
Description
One, technical field
The present invention relates to the online continuous characterizing method that detects of solid material elastic parameter.
Two, background technology
The online detection of the defective of material is technological difficulties in the current commercial production, and the homogeneity of material parameter is for having conclusive effect in serviceable life of material.At present the homogeneity of the detection, particularly material parameter of material parameter commonly used detects, and all adopts the method that afterwards detects, and system feedback can't be provided for the line Quality Control of material in real time and then improve the reliability of producing.Therefore the on-line detecting system that can be used for the solid material elastic parameter and the method for development of new are very important.
Three, summary of the invention
The present invention seeks to: utilize contactless elastic parameter detection method, realize the online sign of solid material elastic parameter.The online inhomogeneity non-contact detection method of test material elastic parameter, and the inhomogeneity non-contact detection of a kind of online test material system is proposed.
Technical solution of the present invention is, the online inhomogeneity non-contact detection method of test material elastic parameter, elastic constant to solid material adopts contactless real-time characterization method, generation, detection and system's control by sound wave should may further comprise the steps: (1) utilizes pulse laser to produce pulse laser and is radiated spatial modulator, when pulse laser is restrainted coherent lights through producing two behind the spatial modulator; Lasing light emitter adopts nanosecond or picopulse light source, and by the spatial modulator of optical grating constitution pulsed light is carried out light splitting, and gets wherein ± 1 grade as coherent source; The power of pulse laser is about 10-100 milli Jiao.
(2) utilize the optical component lens combination with the interference field of two bundle coherent optical radiations to measured material surface generation spatial coherence, and form light and dark interference fringe on the measured material surface; Light and dark interference fringe spacing is obtained by regulating lens combination or grating, and measured material is membraneous material; Thickness is the 30-200 micron;
(3) after the detected membraneous material of the interference fringe that is formed by light-pulse generator absorbs, will in membraneous material, produce the sound wave with interference fringe spacing respective wavelength;
(4) utilize the variation of contactless detector of sound light probe (as: OFV5xx of Polytec series laser vibration measurer etc.) real-time detection sound field;
(5) utilize the variation of the detected sound field of time-frequency analysis technology real-time analysis, realize the online sign of solid material elastic parameter; When the certain interference field of grid spacing on test product during excite sound waves, the sound wave that is excited depends on the elastic parameter of material internal, when measured material is even, the acoustic characteristic that is excited at different parts also keeps basically identical, when being detected Sonic wave sending in the real-time analysis and changing, variation has occured in physical parameter or the homogeneity of then having reacted measured material like this;
(6) when the frequency characteristic of tested sound field changes and exceeds threshold value (size of this threshold value depends on the error range that material homogeneity allows), Real-time Feedback is to control system, thereby is the control system Realtime Alerts.
Further, the present invention adopts frequency (such as the 0.1-3K) variation characteristic of monitoring single wavelength sound wave to detect the homogeneity of measured material.
Particularly, the step of the variation of light probe real-time detection sound field is as follows, and behind the system initialization, the 1st step: laser triggers; The 2nd step: light probe is synchronous; The 3rd step: signals collecting; The 4th step: FFT; The 5th step: whether determination frequency changes, and is then to turn for the 6th step, otherwise turns for the 1st step; The 6th step: judge whether superthreshold, be then to turn for the 7th step, otherwise turned for the 1st step; The 7th step: report to the police; The 8th step: finish.
Adopt the interference field of single grid spacing in material, to excite the sound wave (this wavelength depends on thickness or the diameter of required detection test material, and wavelength coverage is between sub-micron is to several millimeters) of respective wavelength also to detect the frequency variation characteristics of the sound wave that is excited.
The inhomogeneity non-contact detection of a kind of online test material system; This system comprises following part: pulsed laser; The spatial modulator of optical grating constitution; The ultrasonic detector that light probe or vibration measurement with laser device (such as the OFV534 laser vibration measurer of Polytec etc.) consist of; System's control and analysis software.Realize that the real-time characterization of elastic properties of materials parameter and the homogeneity of elastic properties of materials parameter detect online; Described non-contact detection system adopts spatial modulator regulating impulse laser, and produces the light and dark interference field of transient state at material surface, thereby excites the sound wave of respective wavelength.
Use contactless sonic detection system, the acoustic wave character that real-time detection excites.
The invention has the beneficial effects as follows: the present invention compared with prior art has following outstanding advantages: (1) uses contactless laser detecting method greatly to improve the real-time that system detects; (2) characteristic of employing optical interference and optical detection sound field, the resolution and the sensitivity that have improved system; (3) method of employing time frequency analysis has improved degree of accuracy and the anti-interference of system, thereby applicable to the various working condition, has had very strong adaptability.
Four, description of drawings
The system construction drawing of Fig. 1 real-time characterization elastic properties of materials parameter.
Detected signal and corresponding time-frequency characteristic thereof on Fig. 2 PET sample.
Fig. 3 system controlling software theory diagram.
Be detected signal and corresponding time-frequency characteristic thereof on Fig. 4 nickel chromium triangle sample on detected signal (a) and corresponding time-frequency characteristic (b) the nickel chromium triangle sample thereof.
Five, embodiment
Embodiment for the real-time detection method of solid material elastic parameter: because tested material is to produce solid material in the actual condition, the enforcement of this method can be adopted non-contact detection system as shown in Figure 1.The system construction drawing of real-time characterization elastic properties of materials parameter among Fig. 1, pulse laser 1, diaphragm 2, lens 3, catoptron 4, online test product 5, grating 6, pulse laser 7, laser vibration measurer 8.
1) the sound excitaton source of detection system is by the pulsed laser source of spatial modulation, and this lasing light emitter adopts nanosecond or picopulse light source, and by grating pulsed light is carried out light splitting, and gets wherein ± 1 grade as coherent source;
2) utilize lens combination that coherent light is poly-to measured material surface (PET film as shown in Figure 1, thickness is 130 microns), form light and dark interference fringe, its spacing can obtain by regulating lens combination or grating, the grating pair pulse laser of choosing the grid spacing in this example and be 115 microns carries out light splitting, and to be 3 lens combination by enlargement ratio form spacing at sample surfaces is 345 microns interference fringe;
3) use laser probe to survey, use the OFV503 laser vibration measurer of Polytec to detect the acoustical signal that is excited in this example, and the variation characteristic of this signal of real-time analysis in time-frequency domain;
4) utilize the be excited frequency characteristic of acoustical signal of control software analysis, according to the variation characteristic of frequency change with the real-time analysis material parameter, thereby and feed back to control software production controlled in real time; Its control principle block diagram as shown in Figure 3.
Embodiment 2:
1) identical with example 1, adopt in this experiment wavelength be the nanosecond laser of 532 nanometers as excitaton source, by binary raster this pulsed light is carried out light splitting, get wherein ± 1 grade as coherent source, its schematic diagram is as shown in Figure 1;
2) utilize lens combination that coherent light is poly-to measured material (nickel chromium triangle sample Cr20Ni80, thickness are 0.1 millimeter) surface, as shown in Figure 1; Form light and dark interference fringe, its spacing can obtain by regulating lens combination or grating, the grating pair pulse laser of choosing the grid spacing in this example and be 115 microns carries out light splitting, and to be 3 lens combination by enlargement ratio form spacing at sample surfaces is 345 microns interference fringe;
3) use laser probe to survey, use the OFV503 laser vibration measurer of Polytec to detect the acoustical signal that is excited in this example, and the variation characteristic of this signal of real-time analysis in time-frequency domain, detected signal and time-frequency characteristic thereof are as shown in Figure 4 accordingly;
4) utilize the be excited frequency characteristic of acoustical signal of control software analysis, according to the variation characteristic of frequency change with the real-time analysis material parameter, thereby and feed back to control software production controlled in real time; Its control principle block diagram as shown in Figure 3.
The online inhomogeneity non-contact detection of test material system; Comprise pulsed laser; The spatial modulator of optical grating constitution; Light deflection detector (bandwidth 1GHz) or based on the ultrasonic detector of interfering or the vibration measurement with laser device of Doppler effect consists of; System's control and analysis software module realizes that the real-time characterization of elastic properties of materials parameter and the homogeneity of elastic properties of materials parameter detect online; Described non-contact detection system adopts spatial modulator regulating impulse laser, excites the sound wave of respective wavelength.
In system's control flow block diagram, begin behind the system initialization, the 1st step: laser triggers; The 2nd step: light probe is synchronous; The 3rd step: signals collecting; The 3rd step: FFT; The 4th step: whether determination frequency changes, and is then to turn for the 5th step, otherwise turns for the 1st step; The 5th step: judge whether superthreshold, be then to turn for the 6th step, otherwise turned for the 1st step; : the 6th step: report to the police; The 7th step: finish.
Claims (4)
1. the online inhomogeneity non-contact detection method of test material elastic parameter is characterized in that the elastic constant of solid material is adopted contactless real-time characterization method, should may further comprise the steps by generation, detection and system's control of sound wave:
(1) utilize pulsed laser radiation to spatial modulator, when pulse laser is restrainted coherent lights through producing two behind the spatial modulator; Lasing light emitter adopts nanosecond or picopulse light source, and by the spatial modulator of optical grating constitution pulsed light is carried out light splitting, and gets wherein ± 1 grade as coherent source;
(2) utilize the optical component lens combination with the interference field of two bundle coherent optical radiations to measured material surface generation spatial coherence, and form light and dark interference fringe on the measured material surface; Light and dark interference fringe spacing is obtained by regulating lens combination or grating, and measured material is membraneous material; Thickness is the 30-200 micron;
(3) after the detected membraneous material of the interference fringe that is formed by light-pulse generator absorbs, will in membraneous material, produce the sound wave with interference fringe spacing respective wavelength;
(4) utilize the variation of contactless detector of sound, light probe real-time detection sound field;
(5) utilize the variation of the detected sound field of time-frequency analysis technology real-time analysis, realize the online sign of solid material elastic parameter; When the certain interference field of grid spacing on test product during excite sound waves, the sound wave that is excited depends on the elastic parameter of material internal, when measured material is even, the acoustic characteristic that is excited at different parts also keeps basically identical, like this when being detected Sonic wave sending in the real-time analysis and changing, then reacted the variation characteristic of material parameter, i.e. the variation characteristic of material character;
(6) when the frequency characteristic of tested sound field changes and exceeds threshold value, Real-time Feedback is to control system, thereby is the control system Realtime Alerts.
2. the inhomogeneity non-contact detection method of online test material elastic parameter according to claim 1 is characterized in that adopting the interference field of single grid spacing to excite the sound wave of respective wavelength also to detect the frequency variation characteristics of the sound wave that is excited in material.
3. the inhomogeneity non-contact detection method of online test material elastic parameter according to claim 1 is characterized in that the step of light probe real-time detection sound field variation is as follows, and behind the system initialization, the 1st step: laser triggers; The 2nd step: light probe is synchronous; The 3rd step: signals collecting; The 4th step: FFT; The 5th step: whether determination frequency changes, and is then to turn for the 6th step, otherwise turns for the 1st step; The 6th step: judge whether superthreshold, be then to turn for the 7th step, otherwise turned for the 1st step; The 7th step: report to the police; The 8th step: finish.
4. the inhomogeneity non-contact detection of online test material system; Comprise following part: pulsed laser; The spatial modulator of optical grating constitution; Light deflection detector or based on the ultrasonic detector of interfering or the vibration measurement with laser device of Doppler effect consists of; System's control and analysis software module realizes that the real-time characterization of elastic properties of materials parameter and the homogeneity of elastic properties of materials parameter detect online; Described non-contact detection system adopts spatial modulator regulating impulse laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104952758A CN103018170A (en) | 2012-11-28 | 2012-11-28 | Non-contact detection method for detecting elastic parameter uniformity of material on line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104952758A CN103018170A (en) | 2012-11-28 | 2012-11-28 | Non-contact detection method for detecting elastic parameter uniformity of material on line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103018170A true CN103018170A (en) | 2013-04-03 |
Family
ID=47967024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104952758A Pending CN103018170A (en) | 2012-11-28 | 2012-11-28 | Non-contact detection method for detecting elastic parameter uniformity of material on line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103018170A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324471A (en) * | 2016-11-07 | 2017-01-11 | 南京大学 | Method for signal measurement applying transient carrier grating technology |
| CN107782786A (en) * | 2017-09-27 | 2018-03-09 | 重庆交通大学 | A kind of steel construction rust detection device and method based on pulse microwave pyrogenicity vibration measuring |
| CN107860716A (en) * | 2017-10-30 | 2018-03-30 | 东北大学 | A kind of lossless detection method and equipment of the elastic constant based on laser-ultrasound |
| CN108871640A (en) * | 2018-06-13 | 2018-11-23 | 西安交通大学 | Residual stress nondestructive detection system and method based on transient grating Laser thermo-elastic generated surface acoustic waves |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4253060A (en) * | 1979-05-29 | 1981-02-24 | Hughes Aircraft Company | RF Spectrum analyzer |
| US5633711A (en) * | 1991-07-08 | 1997-05-27 | Massachusettes Institute Of Technology | Measurement of material properties with optically induced phonons |
| US6016202A (en) * | 1997-06-30 | 2000-01-18 | U.S. Philips Corporation | Method and apparatus for measuring material properties using transient-grating spectroscopy |
| CN1360204A (en) * | 2001-11-30 | 2002-07-24 | 江苏大学 | Laser impact method and equipment for measuring binding stregnth of interface |
| CN101281172A (en) * | 2007-04-04 | 2008-10-08 | 南京理工大学 | Laser sonic surface wave stress test system |
| CN101329204A (en) * | 2008-07-18 | 2008-12-24 | 清华大学 | Method and apparatus for measuring thin film non-uniform stress on line |
| CN101395467A (en) * | 2007-01-11 | 2009-03-25 | 东芝三菱电机产业系统株式会社 | Structure/material measuring device for metallic material |
-
2012
- 2012-11-28 CN CN2012104952758A patent/CN103018170A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4253060A (en) * | 1979-05-29 | 1981-02-24 | Hughes Aircraft Company | RF Spectrum analyzer |
| US5633711A (en) * | 1991-07-08 | 1997-05-27 | Massachusettes Institute Of Technology | Measurement of material properties with optically induced phonons |
| US6016202A (en) * | 1997-06-30 | 2000-01-18 | U.S. Philips Corporation | Method and apparatus for measuring material properties using transient-grating spectroscopy |
| CN1360204A (en) * | 2001-11-30 | 2002-07-24 | 江苏大学 | Laser impact method and equipment for measuring binding stregnth of interface |
| CN101395467A (en) * | 2007-01-11 | 2009-03-25 | 东芝三菱电机产业系统株式会社 | Structure/material measuring device for metallic material |
| CN101281172A (en) * | 2007-04-04 | 2008-10-08 | 南京理工大学 | Laser sonic surface wave stress test system |
| CN101329204A (en) * | 2008-07-18 | 2008-12-24 | 清华大学 | Method and apparatus for measuring thin film non-uniform stress on line |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324471A (en) * | 2016-11-07 | 2017-01-11 | 南京大学 | Method for signal measurement applying transient carrier grating technology |
| CN107782786A (en) * | 2017-09-27 | 2018-03-09 | 重庆交通大学 | A kind of steel construction rust detection device and method based on pulse microwave pyrogenicity vibration measuring |
| CN107860716A (en) * | 2017-10-30 | 2018-03-30 | 东北大学 | A kind of lossless detection method and equipment of the elastic constant based on laser-ultrasound |
| CN108871640A (en) * | 2018-06-13 | 2018-11-23 | 西安交通大学 | Residual stress nondestructive detection system and method based on transient grating Laser thermo-elastic generated surface acoustic waves |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108871640B (en) | Transient grating laser ultrasonic surface wave-based residual stress nondestructive testing system and method | |
| Karabutov et al. | Time-resolved laser optoacoustic tomography of inhomogeneous media | |
| US7798000B1 (en) | Non-destructive imaging, characterization or measurement of thin items using laser-generated lamb waves | |
| CN103543125B (en) | All-optical gas detection method and device based on Michelson interference principle | |
| CN103018170A (en) | Non-contact detection method for detecting elastic parameter uniformity of material on line | |
| JP4386709B2 (en) | Material nondestructive inspection method and apparatus by laser ultrasonic wave | |
| TW201830012A (en) | Arrays of acoustic transducers for physical analysis of batteries | |
| Hayashi et al. | Generation of narrowband elastic waves with a fiber laser and its application to the imaging of defects in a plate | |
| CN103471998B (en) | Thermoplastic material reflection and transmission coefficients laser measurement system | |
| CN106093596A (en) | The full measuring method of space charge of nanometer resolution can be realized | |
| CN102830173B (en) | Shaft structure surface acoustic wave non-contact wave velocity extraction method | |
| CN110243521A (en) | A kind of sheet stress measurement method and sheet stress measuring system | |
| CN102353916A (en) | Device and measuring method for measuring magnetoconstriction coefficient through multi-beam laser heterodyne secondary harmonic method | |
| Huan et al. | Frequency-domain laser ultrasound (FDLU) non-destructive evaluation of stress–strain behavior in an aluminum alloy | |
| JP6121873B2 (en) | Laser ultrasonic inspection apparatus and method | |
| CN204008099U (en) | Damping clad plate damping capacity proving installation | |
| US7423279B2 (en) | Systems and methods that detect changes in incident optical radiation | |
| CN114112132B (en) | System and method for measuring gradient residual stress by laser ultrasonic | |
| RU2658112C1 (en) | Method of measurement of displacement | |
| US20150153274A1 (en) | Apparatus and method of measuring terahertz wave | |
| Hong et al. | Rapid and accurate analysis of surface and pseudo-surface waves using adaptive laser ultrasound techniques | |
| US9829469B2 (en) | Apparatus and method for measuring nonlinear parameters | |
| CN113406003A (en) | Annular beam laser-based ultrasonic synthetic aperture focusing imaging device and method | |
| CN106461537B (en) | Device for characterizing an interface of a structure and corresponding device | |
| KR20170107274A (en) | Non-contact type system and method for measuring thickness using laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130403 |