CN102506781A - Laser ultrasonic thickness measuring method and laser ultrasonic thickness measuring device capable of being used for field detection - Google Patents
Laser ultrasonic thickness measuring method and laser ultrasonic thickness measuring device capable of being used for field detection Download PDFInfo
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- CN102506781A CN102506781A CN2011103643593A CN201110364359A CN102506781A CN 102506781 A CN102506781 A CN 102506781A CN 2011103643593 A CN2011103643593 A CN 2011103643593A CN 201110364359 A CN201110364359 A CN 201110364359A CN 102506781 A CN102506781 A CN 102506781A
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Abstract
The invention discloses a laser ultrasonic thickness measuring method and a laser ultrasonic thickness measuring device capable of being used for field detection. The laser ultrasonic thickness measuring method is characterized in that a laser beam is sent out by a laser to excite an ultrasonic wave on the surface in a specific position of a measured object; meanwhile, an excited wave signal and an echo wave signal produced on the surface in the position are received by an air coupling sensor on the same side of the measured object as the laser; and the propagation distance of the ultrasonic wave is calculated according to the time difference between the excited wave signal and the echo wave signal, and a longitudinal wave propagation velocity of the measured object, so that thickness measurement of the specific position is realized. The device mainly comprises the laser, a main supporting seat, the air coupling sensor, a supporting rod, a centering device, a signal processing system and a display system. The device has a simple and light structure, and can meet the requirements of field detection; and through the adoption of the non-contact type detection method, the thicknesses of high temperature and high-corrosive measured objects can be measured.
Description
Technical field
The present invention relates to a kind of method and device that is used for the on-the-spot laser-ultrasound thickness measuring that detects, this method and apparatus belongs to the Non-Destructive Testing field.
Technical background
Common audiogage is need probe be in direct contact with on the measured object surface of smearing body overcoupling agent to carry out thickness measuring work, but its used probe can not contact the testee of high temperature or highly corrosive material.In the enterprise of chemical plant or other working pressure container; Can produce higher heat when container and section of tubing running; Can not use common contact probe to detect; And detect on-the-spot pipeline, the equipment complicacy of arranging, owing to local narrow and small, the more high situation in detection position can occur, the testing personnel can't be near testee.Generation for above-mentioned situation just needs to use non-contact detection equipment.
The principle of laser-ultrasound is that laser and material to be tested directly act on, and produces ultrasound wave through the thermoelastic effect or the effect of ablating.The patent No. is that CN00809253.2 provides a kind of method that laser-ultrasound that high-temperature pipe detects detects that is used to detect, and utilizes two laser instruments, and one is used for being created in propagate in the tube wall ultrasonic at the specific generation point of said tube surface; Another is coupled with an interferometer and is used for detecting the ultrasonic echo that on a check point on said surface, produces; But this device uses two laser instrument costs higher, and is inappropriate for on-the-spot the detection, and this patent uses the mode of laser instrument and Air Coupling sensor combinations; Reduced cost; The utilization centering device is to adapt to the different detection environment, and the dirigibility that device is detected increases, and has overcome above deficiency.
Summary of the invention
The invention provides a kind of method and device of the on-the-spot laser-ultrasound thickness measuring that detects, say with having more, is method and the device that utilizes the laser pumping ultrasonic signal, utilizes the non-contact measurement thickness of Air Coupling sensor reception signal.
Its method is to be sidelong at one of testee to put laser instrument, is being placed with the Air Coupling sensor with laser instrument the same side.The signal receiving plane of this Air Coupling sensor is tiltedly for the surface, detection position; Through regulating the front and back position of pole; Make overlapping to heart hot spot on the tested object plane of being formed on that is arranged in that main bearing and last two miniature lasers of pole send, at this moment the Air Coupling sensor can encourage ultrasonic position over against laser instrument; Laser instrument gives off laser beam; This laser beam irradiation is at the needs detection place excitation ultrasound ripple of measured object; The Air Coupling sensor just can receive echoed signal in surperficial field wave signal that produces of laser pumping measured object and the measured object; Signal is sent into signal processing system from the Air Coupling sensor, goes out the distance of ultrasonic propagation by the longitudinal wave propagation speed calculation of mistiming between field wave signal and the echoed signal and testee, and the ultrasonic propagation distance of calculating with the mistiming is the thickness of testee divided by 2 again; This just realizes the thickness measure of this specific location, and shows through the thickness of signal display system with testee.
The Air Coupling sensor is placed in laser-ultrasound produces position 20mm; Laser instrument can be placed on the place away from measured object, and both link together through mechanism and utilize centering device to carry out centrally aligned and guarantee that laser-ultrasound produces the position and overlaps with position to be detected.
The device of laser-ultrasound thickness measuring, mainly by laser instrument, main bearing, the Air Coupling sensor, pole, centering device, signal processing system and display system are formed.Laser instrument and sensor pole are installed on the main bearing, on main bearing, are provided with a guide rail parallel with laser beam, and the rear end of pole is installed on the guide rail and can on guide rail, slides front and back, and the front end of pole is furnished with the Air Coupling sensor.Centering device is made up of two miniature lasers, and one is arranged on the pole, and its radiation direction is parallel with the direction that the Air Coupling sensor receives signal, and another is arranged on the main bearing, and its radiation direction is parallel with the direction of laser instrument emission laser.Signal processing system is connected with the Air Coupling sensor, and signal display system is connected the thickness that can directly show measured object with signal processing system.Centering device wherein is made up of two miniature lasers, and miniature laser also can be an ordinary light source.The device of this laser-ultrasound thickness measuring also comprises the high temperature measurement device, is used for measuring near the temperature of check point, so that confirm the velocity of sound of material under the Current Temperatures.
Advantage of the present invention exists:
1) used contactless detection method, avoided because the situation of the constraint that the high temperature of testee or corrosivity are brought to testing by force can only be accomplished in measured object one side and detect.
2) the thickness measurement with laser installation cost than other is lower, simple in structure, easy to operate, is easy to carry, and can adapt to the on-the-spot requirement that detects.
3) laser instrument can be positioned over the place far away apart from measured object; Only through the elongation pole make the Air Coupling sensor near testee, just can accomplish narrow and small in the place, the more high testing personnel in detection position can't be near the testing under the situation such as testee.
Figure of description
The structural drawing of Fig. 1 laser-ultrasound measuring thickness device.
1. 6. pairs of heart hot spots of testee 2. laser instruments, 3. Air Coupling sensor 4. poles, 5. centering devices, 7. laser beam, 8. receiving systems, 9. signal display systems, 10. main bearing 11. guide rails.
Embodiment
Laser-ultrasound measuring thickness device as shown in Figure 1, mainly by laser instrument 2, main bearing 10, Air Coupling sensor 3, pole 4, centering device 5, signal processing system 8 is formed with display system 9.Laser instrument 2 is installed on the main bearing with passing pole 4, on main bearing, is provided with a guide rail parallel with laser beam 11, and the rear end of pole 4 is installed on the guide rail 11 and can on guide rail, slides front and back, and the front end of pole 4 is furnished with Air Coupling sensor 3.Centering device is made up of two miniature lasers, and one is arranged on the pole 4, and its radiation direction is parallel with the direction that Air Coupling sensor 3 receives signal, and another is arranged on the main bearing 10, and its radiation direction is parallel with the direction of laser instrument emission laser.Signal processing system 8 is connected with the Air Coupling sensor, signal display system 9 be connected with signal processing system 8 can directly show measured object thickness.
Before detection,, guarantee that when heart hot spot 6 was overlapped, Air Coupling sensor 3 (was laser ultrasonic and produces the position) over against needs position to be detected through the position of dimensional measurement adjusting centering device 5.According to the scene detect actual conditions this device through hand-held or be installed in the method for support, be placed on testee 1 before, with the surface that thickness is the measured object 1 of 10cm that is right against of laser instrument 2, make light beam 7 can the vertical radiation measured objects surperficial.Operation centering device 5; Regulate the front and back position of pole 4; Make overlapping on 1 of the measured object of being formed on that is arranged on main bearing 10 and the pole 4 that two miniature lasers send to heart hot spot 6; At this moment Air Coupling sensor 3 makes laser instrument 2 give off laser beam 7 over against the ultrasonic position of laser instrument 1 excitation, and these laser beam 7 irradiation are at the measured object 1 surface excitation ultrasound wave of measured object 1; Air Coupling sensor 3 just can receive echoed signal in surperficial field wave signal that produces of laser pumping measured object and the measured object; Signal is sent into signal processing system 8 from the Air Coupling sensor, receive the poor t on time shaft of field wave signal and echoed signal, simultaneously again by the longitudinal wave velocity C of testee material under the Current Temperatures; Use the mistiming as t multiply by longitudinal wave velocity C again divided by 2 obtain testee thickness, and show through the thickness of signal display system 9 with testee.
Air Coupling sensor 3 is placed in laser-ultrasound produces position 20mm; Laser instrument can be placed on the place away from measured object 1; Both link together through mechanism and utilize centering device 5 to carry out centrally aligned and guarantee that laser-ultrasound produces the position and overlaps with position to be detected; In the device centering device 5 form by two miniature lasers, miniature laser also can be an ordinary light source.The device of this laser-ultrasound thickness measuring also comprises the high temperature measurement device, is used for measuring near the temperature of check point, so that confirm the velocity of sound of material under the Current Temperatures.
Claims (6)
1. a device that is used for the on-the-spot laser-ultrasound thickness measuring that detects is characterized in that, by laser instrument (2), and main bearing (10), Air Coupling sensor (3), pole (4), centering device (5), signal processing system (8) is formed with display system (9); Said laser instrument (2) is installed on the main bearing (10) with pole (4); On main bearing (10), be provided with a parallel guide rail (11) of laser beam that is sent with laser instrument (2); The rear end of pole (4) is installed in guide rail (11) and upward and before and after on guide rail slides; The front end of pole (4) is provided with Air Coupling sensor (3), and the signal receiving plane of said Air Coupling sensor (3) is tiltedly for surface, needs detection position; Centering device (5) is made up of two miniature lasers; One is arranged on the pole (4); Its radiation direction is parallel with the direction that Air Coupling sensor (3) receives signal, and another is arranged on the main bearing (10), and its radiation direction is parallel with the direction of laser instrument emission laser; Signal processing system (8) is connected with the Air Coupling sensor, and signal display system (9) is connected the thickness that (8) directly show measured object with signal processing system.
2. the device that is used for the on-the-spot laser-ultrasound thickness measuring that detects according to claim 1 is characterized in that, said Air Coupling sensor (3) is placed on distance to be needed in the 20mm of surface, detection position, and laser instrument (2) is placed on the place away from measured object.
3. the device that is used for the on-the-spot laser-ultrasound thickness measuring that detects according to claim 1 and 2 is characterized in that, also comprises the high temperature measurement device, measures near the temperature of check point.
4. the device that is used for the on-the-spot laser-ultrasound thickness measuring that detects according to claim 1 and 2 is characterized in that said two miniature lasers are ordinary light source.
5. one kind is utilized the described method that is used for the device of the on-the-spot laser-ultrasound thickness measuring that detects of claim 1; It is characterized in that; Through the position of dimensional measurement adjusting centering device (5), when heart hot spot (6) was overlapped, Air Coupling sensor (3) was over against needs position to be detected; It is preceding that support is placed on testee (1), with the surface that is right against measured object (1) of laser instrument (2), makes the light beam (7) can vertical radiation measured object surface; Operation centering device (5); Regulate the front and back position of pole (4); Make and be arranged on main bearing (10) and the pole (4); Two miniature lasers send the overlapping on measured object (1) face to heart hot spot (6) of formation, and at this moment Air Coupling sensor (3) is over against the ultrasonic position of laser instrument (2) excitation; Make laser instrument (2) give off laser beam (7); Laser beam (7) irradiation is at measured object (1) the surface excitation ultrasound wave of measured object (1); Air Coupling sensor (3) receives echoed signal in surperficial field wave signal that produces of laser pumping measured object and the measured object; Signal is sent into signal processing system (8) from the Air Coupling sensor, receive the poor t on time shaft of field wave signal and echoed signal, simultaneously again by the longitudinal wave velocity C of testee material under the Current Temperatures; The thickness that obtains testee is tC/2, and shows through the thickness of signal display system (9) with testee.
6. the method that is used for the on-the-spot laser-ultrasound thickness measuring that detects according to claim 5 is characterized in that, with near the temperature the high temperature measurement measurement device check point, confirms the velocity of sound of material under the Current Temperatures.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075981A (en) * | 2012-12-31 | 2013-05-01 | 汕头市超声仪器研究所有限公司 | Ultrasonic thickness measuring method |
| CN104707871A (en) * | 2015-03-16 | 2015-06-17 | 浙江大学 | Sheet material thickness online detection and adjustment system based on laser ultrasonic |
| CN104729435A (en) * | 2015-03-13 | 2015-06-24 | 浙江大学 | Sheet thickness online measurement system based on laser ultrasound |
| CN104990521A (en) * | 2015-06-23 | 2015-10-21 | 烟台富润实业有限公司 | Non-contact type composite material thickness measurement device and method |
| CN105277571A (en) * | 2015-06-25 | 2016-01-27 | 浙江大学 | Rotating axle surface crack on-line detection system and detection method |
| CN105675474A (en) * | 2014-11-21 | 2016-06-15 | 中国海洋石油总公司 | Method for detecting corrosion degree of pipe parts |
| CN106441176A (en) * | 2016-10-12 | 2017-02-22 | 苏州博昇科技有限公司 | Air coupling ultrasonic wave thin film thickness detection method |
| CN106441119A (en) * | 2016-06-30 | 2017-02-22 | 山东省科学院激光研究所 | Thermal-state steel tube thickness online detection device |
| CN109387568A (en) * | 2018-12-21 | 2019-02-26 | 西安增材制造国家研究院有限公司 | A kind of laser ultrasonic detection device and increasing material manufacturing, detection integrated equipment |
| CN109813241A (en) * | 2019-03-21 | 2019-05-28 | 马鞍山恒瑞测量设备有限公司 | A kind of dedicated calibrator of hot-strip |
| CN110672047A (en) * | 2019-10-16 | 2020-01-10 | 江苏省特种设备安全监督检验研究院 | Laser ultrasonic measurement method for thickness of high-temperature metal material |
| WO2020192057A1 (en) * | 2019-03-27 | 2020-10-01 | 大连理工大学 | Large wall plate ultrasonic on-machine non-contact scanning thickness measuring device and method |
| CN114812457A (en) * | 2022-06-28 | 2022-07-29 | 太原理工大学 | Light path alignment self-adjusting laser ultrasonic metal composite plate thickness measuring device and method |
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| CN103075981B (en) * | 2012-12-31 | 2016-01-20 | 汕头市超声仪器研究所有限公司 | A kind of ultrasonic thickness test method |
| CN103075981A (en) * | 2012-12-31 | 2013-05-01 | 汕头市超声仪器研究所有限公司 | Ultrasonic thickness measuring method |
| CN105675474A (en) * | 2014-11-21 | 2016-06-15 | 中国海洋石油总公司 | Method for detecting corrosion degree of pipe parts |
| CN105675474B (en) * | 2014-11-21 | 2018-10-23 | 中国海洋石油集团有限公司 | A method of detection pipe fitting extent of corrosion |
| CN104729435B (en) * | 2015-03-13 | 2017-06-13 | 浙江大学 | Sheet metal thickness on-line measurement system based on laser-ultrasound |
| CN104729435A (en) * | 2015-03-13 | 2015-06-24 | 浙江大学 | Sheet thickness online measurement system based on laser ultrasound |
| CN104707871A (en) * | 2015-03-16 | 2015-06-17 | 浙江大学 | Sheet material thickness online detection and adjustment system based on laser ultrasonic |
| CN104707871B (en) * | 2015-03-16 | 2016-08-24 | 浙江大学 | Sheet metal thickness on-line checking based on laser-ultrasound and the system of adjustment |
| CN104990521A (en) * | 2015-06-23 | 2015-10-21 | 烟台富润实业有限公司 | Non-contact type composite material thickness measurement device and method |
| CN105277571A (en) * | 2015-06-25 | 2016-01-27 | 浙江大学 | Rotating axle surface crack on-line detection system and detection method |
| CN105277571B (en) * | 2015-06-25 | 2018-06-26 | 浙江大学 | A kind of rotating shaft surface crackle on-line detecting system and detection method |
| CN106441119A (en) * | 2016-06-30 | 2017-02-22 | 山东省科学院激光研究所 | Thermal-state steel tube thickness online detection device |
| CN106441176A (en) * | 2016-10-12 | 2017-02-22 | 苏州博昇科技有限公司 | Air coupling ultrasonic wave thin film thickness detection method |
| CN106441176B (en) * | 2016-10-12 | 2019-04-02 | 苏州博昇科技有限公司 | A kind of method of Air Coupling ultrasound examination film thickness |
| CN109387568A (en) * | 2018-12-21 | 2019-02-26 | 西安增材制造国家研究院有限公司 | A kind of laser ultrasonic detection device and increasing material manufacturing, detection integrated equipment |
| CN109813241A (en) * | 2019-03-21 | 2019-05-28 | 马鞍山恒瑞测量设备有限公司 | A kind of dedicated calibrator of hot-strip |
| CN109813241B (en) * | 2019-03-21 | 2024-03-19 | 马鞍山恒瑞测量设备有限公司 | Thickness gauge special for hot rolled strip steel |
| WO2020192057A1 (en) * | 2019-03-27 | 2020-10-01 | 大连理工大学 | Large wall plate ultrasonic on-machine non-contact scanning thickness measuring device and method |
| US11287400B2 (en) | 2019-03-27 | 2022-03-29 | Dalian University Of Technology | Large-panel ultrasonic on-machine non-contact scanning thickness measurement equipment and thickness measurement method |
| CN110672047A (en) * | 2019-10-16 | 2020-01-10 | 江苏省特种设备安全监督检验研究院 | Laser ultrasonic measurement method for thickness of high-temperature metal material |
| CN114812457A (en) * | 2022-06-28 | 2022-07-29 | 太原理工大学 | Light path alignment self-adjusting laser ultrasonic metal composite plate thickness measuring device and method |
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