CN201803990U - Special 20-degree longitudinal wave probe used in TOFD (Time of Flight Diffraction Technique) - Google Patents
Special 20-degree longitudinal wave probe used in TOFD (Time of Flight Diffraction Technique) Download PDFInfo
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- CN201803990U CN201803990U CN2010202747810U CN201020274781U CN201803990U CN 201803990 U CN201803990 U CN 201803990U CN 2010202747810 U CN2010202747810 U CN 2010202747810U CN 201020274781 U CN201020274781 U CN 201020274781U CN 201803990 U CN201803990 U CN 201803990U
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- 239000000523 sample Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title abstract description 3
- 239000011521 glass Substances 0.000 claims abstract description 29
- 230000002950 deficient Effects 0.000 claims description 14
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims description 7
- 238000013016 damping Methods 0.000 claims description 4
- 235000011187 glycerol Nutrition 0.000 claims description 4
- 239000007822 coupling agent Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The utility model relates to a special 20-degree longitudinal wave probe used in TOFD (Time of Flight Diffraction Technique). The special 20-degree longitudinal wave probe comprises an organic glass wedge block and a pressure sensor, wherein the pressure sensor is in threaded connection with a blind hole on an inclined plane of the organic glass wedge block, a coupling agent is loaded in the blind hole, and a discharge orifice is formed on the right side at the bottom of the blind hole; the pressure sensor comprises a casing, a protecting film, a piezoelectric chip, a damp piece and a cable; and the special 20-degree longitudinal wave probe is characterized in that the organic glass wedge block is a 9.1-degree wedge block, namely, the inclined plane of the organic glass wedge block forms a 9.1-degree included angle Alpha with the horizontal plane. The utility model has the benefits that sound path distance and amplitude attenuation are efficiently reduced, and the beam energy can be concentrated, so that the signal-to-noise ratio and the resolution factor are increased.
Description
Technical field
The utility model relates to the special-purpose 20 degree longitudinal wave probes of a kind of TOFD, belongs to ultrasonic probe.
Background technology
During TOFD (ultrasonic time difference diffractive technology) detected, defective end points diffraction wave amplitude was that the variation with incident wave angle (head angle) changes, and incident angle is spent between 80 degree 45, and defective end points diffraction amplitude change is less than 6dB; Incident angle when wave amplitude is maximum is 65 degree, and the signal of defective lower prong is slightly larger than the signal of upper prong at this moment; Incident angle is when the 40 degree left and right sides, and the diffracted signal amplitude is quite low, and especially when 38 spent, the diffracted signal amplitude of defective lower prong reached minimum value; And incident angle wave amplitude when 20 spend gos up.In addition, head angle reduces, and then the wave beam diffusion reduces, and beam energy is more concentrated, helps improving the signal to noise ratio (S/N ratio) of fault location; The ultrasonic signal sound path reduces, and signal attenuation reduces; Depth resolution improves.It is big that head angle becomes, and then the result in contrast.At present, the head angle that TOFD detects is 45 degree, 60 degree and 70 degree, its shortcoming for heavy wall (thin brilliant, wall thickness 〉=80mm) or coarse-grain (in the parts of wall thickness 〉=40mm), lower area, because sound path increases, diffracted signal decay especially severe and along with the increase wave beam diffusion of sound path is big more, fault location diffraction wave amplitude reduces, signal to noise ratio (S/N ratio) reduces, resolution reduces thereby make, and finally causes defective omission or defectoscopy error bigger.
The utility model content
Technical problem to be solved in the utility model provides and can effectively reduce sound path and wave amplitude decay, and can concentrate beam energy, thereby improves the special-purpose 20 degree longitudinal wave probes of a kind of TOFD of signal to noise ratio (S/N ratio) and resolution greatly.
The technical scheme that its technical matters that solves the utility model adopts:
The utility model comprises organic glass wedge piece and pressure transducer, the blind threaded connection on described pressure transducer and the dip plane that is positioned at the organic glass voussoir, in described blind hole, couplant is housed, and be provided with discharge orifice on the right side, bottom of described blind hole; Described pressure transducer comprises housing, diaphragm, piezoelectric chip, damping block and cable; It is characterized in that described organic glass voussoir is 9.1 degree voussoirs, the angle α of the dip plane of promptly described organic glass voussoir and surface level is 9.1 °.
α described in the utility model angle is 9.1 ° ± 0.03 °.
The utility model is for the middle and lower part defective of the thin brilliant parts of wall thickness 〉=80mm, and the excitation frequency of described pressure transducer is 5MHz, and the diameter of the piezoelectric chip of described pressure transducer is Φ 12mm or Φ 6mm.
The utility model is for the middle and lower part defective of the coarse-grain parts of wall thickness 〉=40mm, and the excitation frequency of described pressure transducer is 2.25MHz, and the diameter of the piezoelectric chip of described pressure transducer is Φ 12mm or Φ 6mm.
Couplant described in the utility model is a glycerine.
The diameter of discharge orifice described in the utility model is Φ 0.2mm.
In the utility model, the computing method that the organic glass wedge angle is 9.1 ° are as follows:
Because being compressional wave, TOFD detects, so according to the refraction law formula:
Sin α
The L organic glass/ sin α
The L steel=C
The L organic glass/ C
The L steel(1)
α wherein
The L organic glass, α
The L steelBe respectively the incident compressional angle in organic glass, the steel; C
The L organic glass, C
L SteelBe respectively the longitudinal wave velocity in organic glass, the steel.Because 20 ° of this head angle, i.e. the incident angle α of compressional wave in steel
The L steel=20 °, the velocity of propagation of compressional wave in organic glass is C
The L organic glass=2730m/s, the compressional wave velocity of propagation in steel is C
The L steel=5900m/s is so can get α according to formula (1)
The L organic glass=9.1 °.Therefore, by the organic glass voussoir of 9.1 degree, the incident angle of compressional wave in steel that piezoelectric sensor produces is 20 degree.
The beneficial effects of the utility model are: for heavy wall (thin brilliant, wall thickness 〉=80mm) or coarse-grain (in the parts of wall thickness 〉=40mm), the bottom defective, use these 20 degree longitudinal wave probes effectively to shorten sound path, reduce the decay of defective diffracted wave; And the wave beam diffusion reduces, and makes beam energy more concentrated.Thereby improved greatly heavy wall (thin brilliant, wall thickness 〉=80mm) or coarse-grain (in the parts of wall thickness 〉=40mm), the detection resolution of bottom defective, noise defectoscopy precision when.This sonde configuration is simple, and is easy to utilize.
Description of drawings
Fig. 1 is structural representation of the present utility model (only cuing open the organic glass voussoir).
Fig. 2 is a cut-open view of the present utility model.
In Fig. 1,2,1 organic glass voussoir, 2 blind holes, 3 that are connected with the scanning frame have blind hole, 4 glycerine, 5 discharge orifices, 6 pressure transducers, 7 diaphragms, 8 piezoelectric chips, 9 damping blocks, the housing of 10 pressure transducers, 11 cables, 12 joints of internal thread.
Embodiment
By the embodiment shown in Fig. 1,2 as can be known, it comprises organic glass wedge piece 1 and pressure transducer 6, described pressure transducer 6 is threaded with blind hole 3 on the dip plane that is positioned at organic glass voussoir 1, in described blind hole 3 couplant 4 is housed, and is provided with discharge orifice 5 on the right side, bottom of described blind hole 3; Described pressure transducer 6 comprises housing 10, diaphragm 7, piezoelectric chip 8, damping block 9 and cable 11; It is characterized in that described organic glass voussoir 1 is 9.1 degree voussoirs, the angle α of the dip plane of promptly described organic glass voussoir 1 and surface level is 9.1 °.
In the present embodiment, described α angle is 9.1 ° ± 0.03 °.
In the present embodiment, for the middle and lower part defective of the thin brilliant parts of wall thickness 〉=80mm, the excitation frequency of described pressure transducer 6 is 5MHz, and the diameter of the piezoelectric chip 8 of described pressure transducer 6 is Φ 12mm or Φ 6mm.
In the present embodiment, for the middle and lower part defective of the coarse-grain parts of wall thickness 〉=40mm, the excitation frequency of described pressure transducer 6 is 2.25MHz, and the diameter of the piezoelectric chip 8 of described pressure transducer 6 is Φ 12mm or Φ 6mm.
In the present embodiment, described couplant 4 is a glycerine.
In the present embodiment, the diameter of described discharge orifice 5 is Φ 0.2mm.
The using method of this probe is as follows:
Use the special-purpose 20 degree longitudinal wave probes of a pair of TOFD, be connected with the scanning frame by blind hole 2, the stub end of two probes is relative.To heavy wall (thin brilliant, wall thickness 〉=80mm) or coarse-grain (and the parts of wall thickness 〉=40mm) in, when lower area detects, (grained material is selected 5MHz for use to select suitable excitation frequency, coarse-grain is selected 2.25MHz for use) and piezoelectric chip size (Φ 12mm or Φ 6mm), according to the sound beam focusing degree of depth set probe between distance, carry out scanning then.
Claims (5)
1. a TOFD special-purpose 20 spends longitudinal wave probes, comprise organic glass wedge piece (1) and pressure transducer (6), described pressure transducer (6) is threaded with blind hole (3) on the dip plane that is positioned at organic glass voussoir (1), couplant (4) is housed in described blind hole (3), is provided with discharge orifice (5) on the right side, bottom of described blind hole (3); Described pressure transducer (6) comprises housing (10), diaphragm (7), piezoelectric chip (8), damping block (9) and cable (11); It is characterized in that described organic glass voussoir (1) is 9.1 degree voussoirs, the dip plane of promptly described organic glass voussoir (1) and the angle α of surface level are 9.1 °.
2. the special-purpose 20 degree longitudinal wave probes of a kind of TOFD according to claim 1, it is characterized in that middle and lower part defective for the thin brilliant parts of wall thickness 〉=80mm, the excitation frequency of described pressure transducer (6) is 5MHz, and the diameter of the piezoelectric chip (8) of described pressure transducer (6) is Φ 12mm or Φ 6mm.
3. the special-purpose 20 degree longitudinal wave probes of a kind of TOFD according to claim 1, it is characterized in that middle and lower part defective for the coarse-grain parts of wall thickness 〉=40mm, the excitation frequency of described pressure transducer (6) is 2.25MHz, and the diameter of the piezoelectric chip (8) of described pressure transducer (6) is Φ 12mm or Φ 6mm.
4. according to claim 2 or the special-purpose 20 degree longitudinal wave probes of 3 described a kind of TOFD, it is characterized in that described couplant (4) is a glycerine.
5. the special-purpose 20 degree longitudinal wave probes of a kind of TOFD according to claim 4, the diameter that it is characterized in that described discharge orifice (5) is Φ 0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202747810U CN201803990U (en) | 2010-07-29 | 2010-07-29 | Special 20-degree longitudinal wave probe used in TOFD (Time of Flight Diffraction Technique) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202747810U CN201803990U (en) | 2010-07-29 | 2010-07-29 | Special 20-degree longitudinal wave probe used in TOFD (Time of Flight Diffraction Technique) |
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| CN201803990U true CN201803990U (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202747810U Expired - Fee Related CN201803990U (en) | 2010-07-29 | 2010-07-29 | Special 20-degree longitudinal wave probe used in TOFD (Time of Flight Diffraction Technique) |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706962A (en) * | 2012-07-05 | 2012-10-03 | 北京中唐电工程咨询有限公司 | Ultrasonic flaw detection device and flaw detection method for thick-wall headers and pipelines |
| CN103901113A (en) * | 2014-03-25 | 2014-07-02 | 常州市常超电子研究所有限公司 | Ultrasonic diffraction probe |
| CN103954693A (en) * | 2014-05-06 | 2014-07-30 | 常州市常超电子研究所有限公司 | TOFD (Time of Flight Diffraction) probe |
| CN104483387A (en) * | 2014-12-30 | 2015-04-01 | 国电科学技术研究院 | TOFD check process for inner wall defects of nuclear power thick-wall austenite steel pipelines |
| CN104977364A (en) * | 2015-07-16 | 2015-10-14 | 常州市常超电子研究所有限公司 | Detachable ultrasonic angle beam probe |
| CN104977361A (en) * | 2015-07-16 | 2015-10-14 | 常州市常超电子研究所有限公司 | Wear-resisting angle probe with long service life |
| CN104990986A (en) * | 2015-07-15 | 2015-10-21 | 常州市常超电子研究所有限公司 | Contact type straight beam probe |
| CN104990988A (en) * | 2015-07-15 | 2015-10-21 | 常州市常超电子研究所有限公司 | Anti-interference ultrasonic probe |
| US20150300897A1 (en) * | 2012-11-29 | 2015-10-22 | Beijing Institute Of Technology | Sensor device and residual stress detection system employing same |
-
2010
- 2010-07-29 CN CN2010202747810U patent/CN201803990U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706962A (en) * | 2012-07-05 | 2012-10-03 | 北京中唐电工程咨询有限公司 | Ultrasonic flaw detection device and flaw detection method for thick-wall headers and pipelines |
| US20150300897A1 (en) * | 2012-11-29 | 2015-10-22 | Beijing Institute Of Technology | Sensor device and residual stress detection system employing same |
| US9863826B2 (en) * | 2012-11-29 | 2018-01-09 | Beijing Institute Of Technology | Sensor device and residual stress detection system employing same |
| CN103901113A (en) * | 2014-03-25 | 2014-07-02 | 常州市常超电子研究所有限公司 | Ultrasonic diffraction probe |
| CN103954693A (en) * | 2014-05-06 | 2014-07-30 | 常州市常超电子研究所有限公司 | TOFD (Time of Flight Diffraction) probe |
| CN103954693B (en) * | 2014-05-06 | 2016-04-06 | 常州市常超电子研究所有限公司 | TOFD pops one's head in |
| CN104483387A (en) * | 2014-12-30 | 2015-04-01 | 国电科学技术研究院 | TOFD check process for inner wall defects of nuclear power thick-wall austenite steel pipelines |
| CN104990986A (en) * | 2015-07-15 | 2015-10-21 | 常州市常超电子研究所有限公司 | Contact type straight beam probe |
| CN104990988A (en) * | 2015-07-15 | 2015-10-21 | 常州市常超电子研究所有限公司 | Anti-interference ultrasonic probe |
| CN104977364A (en) * | 2015-07-16 | 2015-10-14 | 常州市常超电子研究所有限公司 | Detachable ultrasonic angle beam probe |
| CN104977361A (en) * | 2015-07-16 | 2015-10-14 | 常州市常超电子研究所有限公司 | Wear-resisting angle probe with long service life |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. HEBEI ELECTRIC POWER CONS Effective date: 20130326 Owner name: HEBEI ELECTRIC POWER CORPORATION ELECTRIC POWER RE Free format text: FORMER OWNER: HEBEI ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20130326 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130326 Address after: 050021 Shijiazhuang Province, Yuhua Province Sports street, South Street, No. 238, No. Patentee after: Electric Power Research Institute of Hebei Electric Power Corporation Patentee after: State Grid Corporation of China Patentee after: Hebei Electric Power Construction & Adjustment Research Institute Address before: 050021 No. 238 South Sports street, Hebei, Shijiazhuang Patentee before: Hebei Electric Power Research Institute |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20150729 |
|
| EXPY | Termination of patent right or utility model |