CN102636576A - Measuring method for delay and leading edge of sound-transmission-wedge surface wave probe - Google Patents
Measuring method for delay and leading edge of sound-transmission-wedge surface wave probe Download PDFInfo
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- CN102636576A CN102636576A CN2012101417681A CN201210141768A CN102636576A CN 102636576 A CN102636576 A CN 102636576A CN 2012101417681 A CN2012101417681 A CN 2012101417681A CN 201210141768 A CN201210141768 A CN 201210141768A CN 102636576 A CN102636576 A CN 102636576A
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- test block
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Abstract
The invention discloses a measuring method for delay and leading edge of a sound-transmission-wedge surface wave probe. The measuring method is completed by the assistance of a test block, wherein the material of the test block is same as that of a sound-transmission inclined wedge, and the shape of the test block is that a circular-arc-shaped bottom surface is arranged at one end of the a cuboid. The measuring method comprises the steps of 1) connecting a surface wave probe with an ultrasonic flaw detector, then arranging the surface wave probe on the upper surface of the test block, moving the surface wave probe forwardly and backwardly, and keeping the surface wave probe to be fixed when the longitudinal waves on the ultrasonic flaw detector obtains the highest reflection waves; 2) reading the time difference t1 between the transmission waves and the received reflection on the ultrasonic flaw detector; 3) calculating the transmission time of the ultrasonic waves in the test block; 4) calculating the delay t' of the test block; 5) measuring the horizontal distance M from the front end face of the surface wave probe to the circular arc of the test block by a steel ruler; and 6) calculating the leading edge l0 of the test block. According to the measuring method, the operation is simple and convenient, the error is small, and the delay and the leading edge of the sound-transmission-wedge surface wave probe can be measured accurately.
Description
Technical field
The present invention relates to the measuring method in a kind of sound penetrating wedge surface wave probe time-delay and forward position.
Background technology
The sensitivity of inspection by Reyleigh wave check-up surface crack is high, is widely used in the Non-Destructive Testing of steel parts such as turbine blade, high-speed steel roll, bent axle.Sound penetrating wedge method at present commonly used produces surface wave in steel, probe adopts the voussoir similar with angle probe, when the shear refraction angle is 90 ° in the workpiece, promptly produces surface wave.Because surface wave is propagated along material surface, in practice examining work, the demarcation of surface wave probe is carried out through the sweep velocity method of adjustment; Its method is: with alignment probe test block seamed edge; Echoed signal is adjusted to certain proportion by horizontal range, generally moves forward and backward probe, changes the L value.L1=20mm for example, L2=40mm etc. utilize depth knob, and horizontal knob is when L1=20mm regulates horizontal scale 20 positions; L2=40mm, adjustment horizontal scale 40 positions promptly accomplish the 1:1 adjustment, and the incidence point of probe calculate by probe forward position (termination of promptly popping one's head in) directly.Obviously there is certain error in the result the who by this method forward position and the delay of probe is demarcated, is not inconsistent with actual forward position of popping one's head in and time-delay.
Summary of the invention
The technical matters that the present invention will solve provides a kind of method that can accurately also measure time-delay of sound penetrating wedge surface wave probe and forward position easily.
For solving the problems of the technologies described above; The technical scheme that the present invention taked is: the measuring method in a kind of sound penetrating wedge surface wave probe time-delay and forward position; Its gordian technique is: it is accomplished by means of a material test block identical with the entrant sound wedge; The shape of said test block is that the end at a rectangular parallelepiped is provided with the circular arc type bottom surface, and the step of said method is following:
1) surface wave probe is connected with ultra-sonic defect detector; And then with surface wave probe in being placed on the test block upper surface; Move forward and backward surface wave probe, when compressional wave on the ultra-sonic defect detector (beginning ripple after first echo) obtains the highest reflection wave, keep surface wave probe motionless;
2) the mistiming t between the reflection of reading transmitted wave on the ultra-sonic defect detector and receiving
1
3) 1. calculate the time t that ultrasound wave is propagated according to following formula in test block
0:
t
0=S/2C
L?=R/C
L ①
Wherein, S is the distance that ultrasound wave is propagated in test block, and R is the radius below the test block (2), and wherein S is 2 times of R, C
LBe longitudinal wave velocity;
4) utilize following formula 2. to calculate the delay t ' of test block
t’=?t
1-?t
0 ②
；
5) measure surface wave probe front end face to test block circular arc horizontal range M with Steel Ruler;
6) 3. calculate the forward position l of test block through following formula
0
l
0=R-M。③ 。
Principle of work of the present invention is: the surface wave of sound penetrating wedge probe emission is when the shear refraction angle is 90 ° in the material, to produce.Incident angle one regularly, the refraction angle of ultrasound wave in material by ultrasonic velocity decision in the material.Use the circular arc bottom surface test block of making certain radius R with surface wave probe entrant sound wedge identical materials; When ultrasound wave incides in the test block; Incident compressional angle in its test block is identical with entrant sound wedge angle, must be less than 90 °, and generation surface wave that can be in test block; After ultrasound wave runs into cylindrical bottom, can launch, and received by probe.What ultrasound wave was propagated in test block is 2 times of test block radius R apart from S.Because the longitudinal wave velocity C in the test block
LCan know the time t that ultrasound wave is propagated in test block
0Just can calculate.The triadic relation satisfies: t
0=S/2Cs=R/C
L
Can directly record the mistiming t that transmits and receive signal through ultra-sonic defect detector
1, then the delay t ' of test block can calculate, and satisfies following formula: t '=t
1-t
0
Because test block is a cylindrical bottom, the forward position l of test block
0, promptly the distance between sound wave incidence point and the probe front end is test block radius R and the poor of front end face to test block circular arc horizontal range M of popping one's head in, l
0=R-M.
Adopt the beneficial effect that technique scheme produced to be: this measuring method is easy and simple to handle, and error is little, can measure time-delay of sound penetrating wedge surface wave probe and forward position accurately.
Description of drawings
Fig. 1 is the synoptic diagram of measuring method of the present invention;
Wherein, 1, surface wave probe; 2, test block.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
Referring to accompanying drawing 1, this measuring method is accomplished by means of a material test block 2 identical with the entrant sound wedge, and the bottom of said test block 2 is a circular arc, and the step of said method is following:
1) surface wave probe 1 is connected with ultra-sonic defect detector, applies couplant then, again surface wave probe 1 is placed on test block 2 upper surfaces, move forward and backward surface wave probe 1, when compressional wave on the ultra-sonic defect detector obtains the highest reflection wave, keep surface wave probe 1 motionless;
2) the mistiming t between the reflection of reading transmitted wave on the ultra-sonic defect detector and receiving
1, unit is second;
3) 1. calculate the time t that ultrasound wave is propagated according to following formula in test block 2
0:
t
0=S/2C
L?=R/C
L ①
Wherein, S is the distance that ultrasound wave is propagated in test block 2, the Wei ㎜ of unit; R is the radius below the test block 2, unit Wei ㎜, and wherein S is 2 times of R, C
LBe longitudinal wave velocity, unit is mm/s;
4) utilize following formula 2. to calculate the delay t ' of test block 2
t’=?t
1-?t
0 ②
；
5) measure surface wave probe 1 front end face to test block 2 circular arc horizontal range M with Steel Ruler, unit is mm;
6) 3. calculate the forward position l of test block through following formula
0
l
0=R-M
③
。
This measuring method is very convenient, and it utilizes the circular arc bottom surface test block of the material known radii R identical with the entrant sound wedge, obtains the travel-time of shear wave in test block, utilizes ultra-sonic defect detector can directly record the mistiming t that transmits and receive signal again
1, obtain the probe time-delay through calculating.Through in test block, directly measuring probe front end face to test block circular arc horizontal range M, the difference of getting M and R is the probe forward position.
Claims (1)
1. the measuring method in sound penetrating wedge surface wave probe time-delay and forward position; It is characterized in that: it is accomplished by means of a material test block (2) identical with the entrant sound wedge; The shape of said test block (2) is that the end at a rectangular parallelepiped is provided with the circular arc type bottom surface, and the step of said method is following:
1) surface wave probe (1) is connected with ultra-sonic defect detector; And then surface wave probe (1) is placed on test block (2) upper surface; Move forward and backward surface wave probe (1),, keep surface wave probe (1) motionless when obtaining compressional wave on the ultra-sonic defect detector during high reflection wave;
2) the mistiming t between the reflection of reading transmitted wave on the ultra-sonic defect detector and receiving
1, unit is second;
3) 1. calculate the time t that ultrasound wave is propagated according to following formula in test block (2)
0, unit is second:
t
0=S/2C
L?=R/C
L ①
Wherein, S is the distance that ultrasound wave is propagated in test block (2), the Wei ㎜ of unit; R is the radius below the test block (2), unit Wei ㎜, and wherein S is 2 times of R, C
LBe longitudinal wave velocity, unit is mm/s;
4) utilize following formula 2. to calculate the delay t ' of test block (2)
t’=?t
1-?t
0 ②
；
5) measure surface wave probe (1) front end face to test block (2) circular arc horizontal range M with Steel Ruler, the Wei ㎜ of unit;
6) 3. calculate the forward position l of test block through following formula
0, the Wei ㎜ of unit
l
0=R-M ③。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101417681A CN102636576A (en) | 2012-05-09 | 2012-05-09 | Measuring method for delay and leading edge of sound-transmission-wedge surface wave probe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101417681A CN102636576A (en) | 2012-05-09 | 2012-05-09 | Measuring method for delay and leading edge of sound-transmission-wedge surface wave probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102636576A true CN102636576A (en) | 2012-08-15 |
Family
ID=46621046
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|---|---|---|---|
| CN2012101417681A Pending CN102636576A (en) | 2012-05-09 | 2012-05-09 | Measuring method for delay and leading edge of sound-transmission-wedge surface wave probe |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458912A (en) * | 2014-12-17 | 2015-03-25 | 国家电网公司 | Method for measuring incidence point, incidence angle and delay of small-angle longitudinal wave angle probe for porcelain insulator |
| CN106383176A (en) * | 2016-08-30 | 2017-02-08 | 西安热工研究院有限公司 | Production method for maximum-intensity surface wave |
| CN109115876A (en) * | 2018-08-01 | 2019-01-01 | 攀枝花天誉工程检测有限公司 | Ultrasonic nondestructive testing method and device |
| CN111289626A (en) * | 2020-04-03 | 2020-06-16 | 浙江省特种设备科学研究院 | Automatic calibration device and automatic calibration method for ultrasonic probe |
| CN111610253A (en) * | 2020-04-30 | 2020-09-01 | 国电锅炉压力容器检验有限公司 | Ultrasonic creeping wave probe defect echo positioning device and 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 |
| CN113418991A (en) * | 2021-07-05 | 2021-09-21 | 西安热工研究院有限公司 | Reference block and method for determining incident point of circumferential defect detection of pipe fitting |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458912A (en) * | 2014-12-17 | 2015-03-25 | 国家电网公司 | Method for measuring incidence point, incidence angle and delay of small-angle longitudinal wave angle probe for porcelain insulator |
| CN104458912B (en) * | 2014-12-17 | 2018-09-11 | 国家电网公司 | Porcelain insulator tilting probe incidence point incidence angle and Time delay measurement method |
| CN106383176A (en) * | 2016-08-30 | 2017-02-08 | 西安热工研究院有限公司 | Production method for maximum-intensity surface wave |
| CN106383176B (en) * | 2016-08-30 | 2019-03-05 | 西安热工研究院有限公司 | A kind of production method of maximum intensity surface wave |
| CN109115876A (en) * | 2018-08-01 | 2019-01-01 | 攀枝花天誉工程检测有限公司 | Ultrasonic nondestructive testing method and device |
| CN109115876B (en) * | 2018-08-01 | 2020-10-16 | 攀枝花天誉工程检测有限公司 | Ultrasonic nondestructive testing method and device |
| CN111289626A (en) * | 2020-04-03 | 2020-06-16 | 浙江省特种设备科学研究院 | Automatic calibration device and automatic calibration method for ultrasonic probe |
| CN111610253A (en) * | 2020-04-30 | 2020-09-01 | 国电锅炉压力容器检验有限公司 | Ultrasonic creeping wave probe defect echo positioning device and method |
| CN111610253B (en) * | 2020-04-30 | 2023-09-22 | 国能锅炉压力容器检验有限公司 | Ultrasonic creeping wave probe defect echo positioning device and 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 |
| CN113418991A (en) * | 2021-07-05 | 2021-09-21 | 西安热工研究院有限公司 | Reference block and method for determining incident point of circumferential defect detection of pipe fitting |
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Owner name: STATE GRID CORPORATION OF CHINA HEBEI ELECTRIC POW Effective date: 20121219 Owner name: HEBEI ELECTRIC POWER CORPORATION ELECTRIC POWER RE Free format text: FORMER OWNER: HEBEI ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20121219 |
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Effective date of registration: 20121219 Address after: 050021 No. 238 South Sports street, Yuhua Road, Hebei, Shijiazhuang Applicant after: Electric Power Research Institute of Hebei Electric Power Corporation Applicant after: State Grid Corporation of China Applicant after: Hebei Electric Power Construction & Adjustment Research Institute Address before: 050021 No. 238 South Sports street, Hebei, Shijiazhuang Applicant before: Hebei Electric Power Research Institute |
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Application publication date: 20120815 |