CN102636249B - Method for measuring acoustic velocity of material by using surface wave - Google Patents
Method for measuring acoustic velocity of material by using surface wave Download PDFInfo
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- CN102636249B CN102636249B CN 201210141763 CN201210141763A CN102636249B CN 102636249 B CN102636249 B CN 102636249B CN 201210141763 CN201210141763 CN 201210141763 CN 201210141763 A CN201210141763 A CN 201210141763A CN 102636249 B CN102636249 B CN 102636249B
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Abstract
The invention relates to a method for measuring acoustic velocity of a material by using surface wave. According to the method, the same pair of ultrasonic surface wave probes are used for irradiating on and receiving from different materials in the same space, the transmission time of the ultrasonic surface wave in a standard test block with known acoustic velocity of ultrasonic surface wave and the transmission time of the ultrasonic surface wave in a work piece with unknown acoustic velocity of ultrasonic surface wave are respectively measured, and the acoustic velocity of the ultrasonic surface wave of the work piece material is calculated; and then, the acoustic velocity of the longitudinal ultrasonic wave and the acoustic velocity of the transverse ultrasonic wave are respectively calculated according to the relations of the transmission speed between the acoustic velocity of the longitudinal ultrasonic wave and the acoustic velocity of the ultrasonic surface wave as well as between the acoustic velocity of the transverse ultrasonic wave and the acoustic velocity of the ultrasonic surface wave. According to the method, the acoustic velocity of the work piece material can be measured without destructively sampling a measured work piece or measuring the thickness of the wall of the work piece, the measurement method is simple and practical, the measurement data are less, and the calculated quantity is relatively low.
Description
Technical field
The present invention relates to a kind of method of utilizing surface wave to measure the material velocity of sound.
Background technology
The material sonic velocity measurement method principle of standard code both at home and abroad all adopts from measured workpiece and cuts sample at present, accurately measures the thickness of sample
TWith the travel-time of ultrasound wave in sample
tAfter, according to relational expression
, calculate the velocity of sound
V
The prerequisite that above-mentioned common method is carried out material sonic velocity measurement is to extract sample or to adopt mechanical means accurately to measure the thickness of test specimen from measured workpiece, but when engineering site is measured a certain workpiece material velocity of sound, often do not allow workpiece is carried out the destructiveness sampling, even record workpiece owing to reasons such as Workpiece structure can not adopt mechanical means, therefore can't adopt the above-mentioned conventional method measuring workpieces material velocity of sound.The patent No. is to have introduced the method for utilizing the incident respectively of different angles ultrasonic shear waves, reception in 200810054605.3, measure the travel-time of ultrasound wave in workpiece by secondary, calculate the workpiece material velocity of sound, can carry out material sonic velocity measurement to the workpiece of the unknown wall thickness of engineering site, the method has solved the difficult problem of engineering site material sonic velocity measurement.But calculated amount is bigger, and measurement data is more.
Summary of the invention
Technical matters to be solved by this invention provides a kind of employing digital ultrasonic flaw detector and utilizes surface wave to measure unknown wall thickness workpiece material velocity of sound new method.
The present invention adopts following technical scheme:
The present invention utilizes with a pair of ultrasonic surface wave probe with uniform distances respectively to the method for unlike material incident, reception, measure respectively ultrasonic surface wave in the reference block of the known ultrasonic surface wave velocity of sound travel-time and the travel-time in the unknown ultrasonic surface wave velocity of sound workpiece, calculate the ultrasonic surface wave velocity of sound of this workpiece material; Calculate the ultrasonic longitudinal wave velocity of sound and the ultrasonic shear waves velocity of sound with the velocity of propagation relational expression of the ultrasonic surface wave velocity of sound respectively according to the ultrasonic longitudinal wave velocity of sound, the ultrasonic shear waves velocity of sound again;
Its concrete grammar step is as follows:
(1) measures ultrasound wave at two overall transmission times that probe is inner
t y :
Choose the identical first surface ripple probe (1) of parameters such as a pair of specification, forward position, time-delay and second surface ripple probe (2), first surface ripple probe (1) is popped one's head in (2) as receiving transducer as transmitting probe, second surface ripple, as shown in Figure 1, two probes are fitted tightly together, mobile mutually, make the echo wave amplitude the highest, can measure ultrasound wave at two overall transmission times that probe is inner
t y , with this overall transmission time
t y Divide equally
tWith
t Y2 , input to digital ultrasonic flaw detector respectively as the time-delay of described two surface wave probes.
(2) measure the travel-time of ultrasonic surface wave in the reference block of the known ultrasonic surface wave velocity of sound
t 1 :
Choose described first surface ripple probe (1) and second surface ripple probe (2), with first surface ripple probe (1) as transmitting probe, second surface ripple probe (2) is as receiving transducer and be opposite to mutually with a constant spacing L on the surface of known ultrasonic surface wave reference block (3), records the travel-time of ultrasonic surface wave in described reference block (3)
t 1 , following relational expression is then arranged:
L=
C R1 ×
t 1 ； （1）
In the formula:
C R1 : the ultrasonic surface wave velocity of sound in the reference block, unit: meter per second
L: the distance between two surface wave probes, unit: rice
t 1 : the travel-time of acoustic beam in reference block, unit: second
(3) measure the travel-time of ultrasonic surface wave in tested workpiece
t 2 :
Choose described first surface ripple probe (1) and second surface ripple probe (2), first surface ripple probe (1) is opposite on the surface of tested workpiece (4) as receiving transducer and with a constant spacing L mutually as transmitting probe, second surface ripple probe (2), records the travel-time of ultrasonic surface wave in described workpiece (4)
t 2 , following relational expression is then arranged:
L=
C R2 ×
t 2 ； （2）
In the formula:
C R2 : the ultrasonic surface wave velocity of sound in the tested workpiece, unit: meter per second is unknown number
L: the distance between two surface wave probes, unit: rice
t 2 : the travel-time of acoustic beam in workpiece, unit: second
Connection is separated above-mentioned formula (1) and (2), can draw the ultrasonic surface wave velocity of sound
C R2
In above-mentioned formula (1), (2), the ultrasonic surface wave velocity of sound in the reference block
C R1 Be known number; The ultrasonic surface wave velocity of sound in the tested workpiece
C R2 Be unknown number; The travel-time of ultrasonic surface wave in reference block and workpiece
t 1 ,
t 2 Record by ultra-sonic defect detector;
(4) at last according to the ultrasonic shear waves velocity of sound in the solid
C S Respectively with the ultrasonic longitudinal wave velocity of sound
C L , the ultrasonic surface wave velocity of sound
C R Velocity of propagation relational expression (3) and (4) calculate the ultrasonic longitudinal wave velocity of sound
C L With the ultrasonic shear waves velocity of sound
C S :
（4）
In the formula:
Be the medium Poisson ratio.
The invention has the beneficial effects as follows: need not carry out destructiveness sampling and need not survey workpiece and can measure the workpiece material velocity of sound measured workpiece, measuring method be simple and practical, and measurement data is less, and calculated amount is less.
Description of drawings
Fig. 1 measures the ultrasound wave position view that the first surface ripple is popped one's head in and the second surface ripple is popped one's head in when the overall transmission time of two probe inside;
Fig. 2 is the synoptic diagram of measurement standard test block and tested workpiece.
In the accompanying drawings: 1 first surface ripple probe, 2 second surface ripples probe, 3 reference blocks, 4 tested workpiece.
Embodiment
Present embodiment concrete grammar step is as follows:
(1) measures ultrasound wave at two overall transmission times that probe is inner
t y :
Choose the identical first surface ripple probe (1) of parameters such as a pair of specification, forward position, time-delay and second surface ripple probe (2), first surface ripple probe (1) is popped one's head in (2) as receiving transducer as transmitting probe, second surface ripple, as shown in Figure 1, two probes are fitted tightly together, mobile mutually, make the echo wave amplitude the highest, can measure ultrasound wave at two overall transmission times that probe is inner
t y , with this overall transmission time
t y Divide equally
tWith
t Y2 , input to digital ultrasonic flaw detector respectively as the time-delay of described two surface wave probes.
(2) measure the travel-time of ultrasonic surface wave in the reference block of the known ultrasonic surface wave velocity of sound
t 1 :
Choose described first surface ripple probe (1) and second surface ripple probe (2), with first surface ripple probe (1) as transmitting probe, second surface ripple probe (2) is as receiving transducer and be opposite to mutually with a constant spacing L on the surface of known ultrasonic surface wave reference block (3), records the travel-time of ultrasonic surface wave in described reference block (3)
t 1 , following relational expression is then arranged:
L=
C R1 ×
t 1 ； （1）
In the formula:
C R1 : the ultrasonic surface wave velocity of sound in the reference block, unit: meter per second
L: the distance between two surface wave probes, unit: rice
t 1 : the travel-time of acoustic beam in reference block, unit: second
(3) measure the travel-time of ultrasonic surface wave in tested workpiece
t 2 :
Choose described first surface ripple probe (1) and second surface ripple probe (2), first surface ripple probe (1) is opposite on the surface of tested workpiece (4) as receiving transducer and with a constant spacing L mutually as transmitting probe, second surface ripple probe (2), records the travel-time of ultrasonic surface wave in described workpiece (4)
t 2 , following relational expression is then arranged:
L=
C R2 ×
t 2 ； （2）
In the formula:
C R2 : the ultrasonic surface wave velocity of sound in the tested workpiece, unit: meter per second is unknown number
L: the distance between two surface wave probes, unit: rice
t 2 : the travel-time of acoustic beam in workpiece, unit: second
Connection is separated above-mentioned formula (1) and (2), can draw the ultrasonic surface wave velocity of sound
C R2
In above-mentioned formula (1), (2), the ultrasonic surface wave velocity of sound in the reference block
C R1 Be known number; The ultrasonic surface wave velocity of sound in the tested workpiece
C R2 Be unknown number; The travel-time of ultrasonic surface wave in reference block and workpiece
t 1 ,
t 2 Record by ultra-sonic defect detector;
(4) at last according to the ultrasonic shear waves velocity of sound in the solid
C S Respectively with the ultrasonic longitudinal wave velocity of sound
C L , the ultrasonic surface wave velocity of sound
C R Velocity of propagation relational expression (3) and (4) calculate the ultrasonic longitudinal wave velocity of sound
C L With the ultrasonic shear waves velocity of sound
C S :
（4）
In the formula:
Be the medium Poisson ratio.
Claims (1)
1. method of utilizing surface wave to measure the material velocity of sound, it is characterized in that using with a pair of ultrasonic surface wave probe with uniform distances respectively to the method for unlike material incident, reception, measure respectively ultrasonic surface wave in the reference block of the known ultrasonic surface wave velocity of sound travel-time and the travel-time in the unknown ultrasonic surface wave velocity of sound workpiece, calculate the ultrasonic surface wave velocity of sound of this workpiece material; Calculate the ultrasonic longitudinal wave velocity of sound and the ultrasonic shear waves velocity of sound with the velocity of propagation relational expression of the ultrasonic surface wave velocity of sound respectively according to the ultrasonic longitudinal wave velocity of sound, the ultrasonic shear waves velocity of sound again; Its concrete grammar step is as follows:
(1) measures ultrasound wave at two overall transmission times that probe is inner
t y:
Choose the identical first surface ripple probe (1) of a pair of specification, forward position, delay parameter and second surface ripple pop one's head in (2), the first surface ripple is popped one's head in (1) as transmitting probe, second surface ripple probe (2) is as receiving transducer, two probes are fitted tightly together, mobile mutually, make the echo wave amplitude the highest, measure ultrasound wave at two overall transmission times that probe is inner
t y , with this overall transmission time
t y Be divided into
tWith
t Y2 , input to digital ultrasonic flaw detector respectively as the time-delay of described two surface wave probes; (2) measure the travel-time of ultrasonic surface wave in the reference block of the known ultrasonic surface wave velocity of sound
t 1 :
Choose described first surface ripple probe (1) and second surface ripple probe (2), with first surface ripple probe (1) as transmitting probe, second surface ripple probe (2) as receiving transducer and be opposite to mutually with a constant spacing L on the surface of reference block (3) of the known ultrasonic surface wave velocity of sound, record the travel-time of ultrasonic surface wave in described reference block (3)
t 1 , following relational expression is then arranged:
L=
C R1 ×
t 1 ； （1）
In the formula:
C R1 : the ultrasonic surface wave velocity of sound in the reference block, unit: meter per second
L: the distance between two surface wave probes, unit: rice
t 1 : the travel-time of acoustic beam in reference block, unit: second
(3) measure the travel-time of ultrasonic surface wave in tested workpiece
t 2 :
Choose described first surface ripple probe (1) and second surface ripple probe (2), first surface ripple probe (1) is opposite on the surface of tested workpiece (4) as receiving transducer and with a constant spacing L mutually as transmitting probe, second surface ripple probe (2), records the travel-time of ultrasonic surface wave in described workpiece (4)
t 2 , following relational expression is then arranged:
L=
C R2 ×
t 2 ； （2）
In the formula:
C R2 : the ultrasonic surface wave velocity of sound in the tested workpiece, unit: meter per second is unknown number
L: the distance between two surface wave probes, unit: rice
t 2 : the travel-time of acoustic beam in workpiece, unit: second
Connection is separated above-mentioned formula (1) and (2), can draw the ultrasonic surface wave velocity of sound in the tested workpiece
C R2
In above-mentioned formula (1), (2), the ultrasonic surface wave velocity of sound in the reference block
C R1 Be known number; The ultrasonic surface wave velocity of sound in the tested workpiece
C R2 Be unknown number; The travel-time of ultrasonic surface wave in reference block and workpiece
t 1 ,
t 2 Record by ultra-sonic defect detector;
(4) at last according to the ultrasonic shear waves velocity of sound in the solid
C S Respectively with the ultrasonic longitudinal wave velocity of sound
C L , the ultrasonic surface wave velocity of sound
C R Velocity of propagation relational expression (3) and (4) calculate the ultrasonic longitudinal wave velocity of sound
C L With the ultrasonic shear waves velocity of sound
C S :
In the formula: σ is the medium Poisson ratio.
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| CN103245726B (en) * | 2013-04-02 | 2015-05-27 | 华东理工大学 | Method for detecting material hydrogen damage through ultrasonic surface waves |
| CN105158338A (en) * | 2015-07-10 | 2015-12-16 | 国网天津市电力公司 | Sound velocity on-site measurement method of smooth surface material |
| KR20170077037A (en) * | 2015-12-25 | 2017-07-05 | 캐논 가부시끼가이샤 | Information acquisition apparatus, signal processing method, and program |
| CN109521092A (en) * | 2018-11-23 | 2019-03-26 | 侬泰轲（昆山）检测科技有限公司 | A kind of non-contact measurement apparatus and its method of surface wave and the Lamb wave velocity of sound |
| CN109932428A (en) * | 2019-02-28 | 2019-06-25 | 天津大学 | For acquiring the removable dual probe piezoelectric transducer of surface acoustic wave signal |
| CN111060044B (en) * | 2019-12-05 | 2021-06-08 | 贵研铂业股份有限公司 | Method for measuring thickness of welding type target by adopting water immersion type C-scan equipment |
| CN112484836B (en) * | 2020-11-20 | 2023-04-07 | 西安热工研究院有限公司 | Ultrasonic probe device and workpiece sound velocity measurement method |
| CN112903082A (en) * | 2021-03-05 | 2021-06-04 | 西安热工研究院有限公司 | Device and method for measuring longitudinal wave sound velocity at high temperature |
| CN113108731B (en) * | 2021-05-28 | 2024-06-18 | 西安热工研究院有限公司 | Method for measuring edge thickness of workpiece by utilizing ultrasonic surface wave |
| CN113607825A (en) * | 2021-07-12 | 2021-11-05 | 西安热工研究院有限公司 | Method and device for measuring performance parameters of planar wedge ultrasonic surface wave probe |
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| US4524621A (en) * | 1983-09-06 | 1985-06-25 | Agency Of Industrial Science & Technology | Method for measurement of velocity of surface acoustic wave |
| US7415880B2 (en) * | 2002-07-17 | 2008-08-26 | Agfa Ntd Gmbh | Method for determining the sound velocity in a basic material, particularly for measuring the thickness of a wall |
| JP3597182B2 (en) * | 2002-07-17 | 2004-12-02 | 秋田県 | Ultrasonic sound velocity measurement method and method for determining Young's modulus and Poisson's ratio based on these methods |
| JP2005315622A (en) * | 2004-04-27 | 2005-11-10 | Fujimitsu Komuten:Kk | Nondestructive inspection method and device of concrete structure |
| CN101266228B (en) * | 2008-03-10 | 2010-09-15 | 河北省电力研究院 | Material sonic velocity measurement method |
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