CN202974955U - High frequency short pulse immersion focusing ultrasonic probe - Google Patents
High frequency short pulse immersion focusing ultrasonic probe Download PDFInfo
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- CN202974955U CN202974955U CN 201220637857 CN201220637857U CN202974955U CN 202974955 U CN202974955 U CN 202974955U CN 201220637857 CN201220637857 CN 201220637857 CN 201220637857 U CN201220637857 U CN 201220637857U CN 202974955 U CN202974955 U CN 202974955U
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Abstract
The utility model discloses a high frequency short pulse immersion focusing ultrasonic probe. One end of a cylindrical shell is provided with a piezoelectric wafer while the other end of the cylindrical shell is a connector, a cable connecting the piezoelectric wafer is led out from the connector, a backing is mounted behind the piezoelectric wafer in the shell, an acoustic lens is mounted in front of the piezoelectric wafer and on the end part of the shell, focuses the ultrasonic acoustic beam and protects the piezoelectric wafer. The outer part of the shell is sealed. The high frequency of the probe is 8-16MHz, and the pulse width of the probe is only 70-200ns, and thus, near field region detection is facilitated, dead zones are reduced effectively, and the resolution ratio is improved. The piezoelectric wafer is a small wafer with diameter being 5-8mm, and the acoustic beam in the near field region is narrow, so that the probe is beneficial to defect location and quantification, and is suitable for detecting a thinner workpiece. The cable is a double-shield high frequency coaxial cable. The probe is integrated with high frequency, immersion focusing, narrow pulse, short echo pulse duration and wave form unimodality, is beneficial to improving the resolution ratio, the sensitivity and the signal-to-noise ratio of ultrasonic detection, and can easily discover small defects.
Description
Technical field
The utility model belongs to ultrasonic detecting technology field, particularly a kind of high-frequency narrow-pulse water immersion focusing ultrasonic probe for detection of the workpiece tiny flaw.
Background technology
UT (Ultrasonic Testing) is to belong to main a kind of in Non-Destructive Testing.Can obtain the degree of depth of metal inside defective and the character of defective from position and the waveform of ultrasonic reflections ripple.At present, ultrasonic flaw detection is widely used in the quality testing of forging, foundry goods and weldment.
Conventional lossless detection method is difficult to find the tiny flaw of precision optical machinery processing parts inside.The workpiece of thickness below 8mm, use conventional ray detection to be difficult to detect well internal defects, usually can only use the surface inspecting methods such as infiltration and magnetic to detect the surface of the work tiny flaw, but be difficult to realize automatic Non-Destructive Testing for baroque workpiece.It is larger that conventional Ultrasound detects the blind area, and resolution, sensitivity are all not enough, and the tiny flaw of workpiece and near surface flaw are difficult to detect.
The utility model content
The purpose of this utility model is a kind of high-frequency narrow-pulse water immersion focusing ultrasonic probe of design, comprises piezoelectric chip, backing and shell, in piezoelectric chip the place ahead, the sound lens focusing ultrasonic wave acoustic beam is arranged.
The high-frequency narrow-pulse water immersion focusing ultrasonic probe of the utility model design comprises piezoelectric chip, backing and shell; columnar shell one end is installed piezoelectric chip; the other end is joint; the cable that connects piezoelectric chip is drawn from joint; in shell, the piezoelectric chip rear is equipped with backing; in piezoelectric chip the place ahead, outer casing end installs sound lens, sound lens focusing ultrasonic wave acoustic beam, and can protect piezoelectric chip.The outside of shell is sealing, to guarantee trouble free service under the water logging condition.Probe does not directly contact with workpiece in couplant water, and hyperacoustic emission is more stable with reception, pops one's head in not easy to wear, life-span is long, easily be automated online detection, and ultrasound wave is convenient in water realize that focused beam detects, satisfies high sensitivity, high-resolution testing requirement.
The characteristics such as it is narrow that this ultrasonic probe is that the high-frequency ultrasonic probe of 8MHz～16MHz has an acoustic beam, and spread angle is little, resolving power good, and concentration of energy, defect location are accurate are fit to effective detection of tiny flaw.
This high-frequency narrow-pulse ultrasonic probe is only the burst pulse ultrasonic probe of 70ns～200ns for producing pulse width, the different frequency harmonic wave that burst pulse comprises has the acoustic pressure regularity of distribution on oneself near field, far field and axis, when the acoustic pressure of different frequency harmonic wave superposes in the near field region, peak-to-valley value is cancelled out each other, make the Sheng Ya – distance Curve of near field region smooth-out, be conducive to the detection of near field region, effectively reduce the blind area, improve resolution.
Described piezoelectric chip is the little wafer of diameter 5～8mm, and in little wafer ultrasonic probe near field region, acoustic beam is narrow, be conducive to defect location with quantitatively, be fit to the detection of less thickness workpiece.Described piezoelectric chip is the lithium titanate material wafer, and piezoelectric property is outstanding.
The ultrasound wave that ultrasonic probe sends can be subject to producing simultaneously in the both sides of wafer after the electric pulse excitation at piezoelectric chip, utilize the ultrasound wave of front wafer surface to carry out Ultrasonic Detection, and the ultrasound wave of chip back surface can exert an influence after reflection and receives the interference wave of signal, the inertia effect that vibrates due to wafer again, wafer continues vibration after electric pulse stops encouraging, thereby cause that the probe pulse width becomes large, defect resolution reduces, and at chip back surface, high performance backing being installed is the effective ways that change probe performance.Described backing is the tungsten powder of different meshes and the high damping backing that epoxy resin is mixed, and piezoelectric chip is played damping and supporting role, makes to stop as early as possible vibration after the piezoelectric chip starting of oscillation, reduces pulse width, improves resolution.Backing also absorbs the ultrasound wave that the piezoelectricity chip back surface produces simultaneously, reduces the interference to the ultrasonic signal reception, improves detecting reliability.
Described cable is the double layer screen high-frequency coaxial cable, and the signal of transmission is completely enclosed within cable conductor inside, has that high-frequency loss is low, shielding and characteristics such as antijamming capability is strong, service band is wide.The interference of maskable external environment condition electric wave to probe driving pulse and echo-pulse in testing process, and the high-frequency impulse that can prevent from popping one's head in is with other electrical equipment of the outside radiation effect of electromagnetic form.
The advantage of the utility model high-frequency narrow-pulse water immersion focusing ultrasonic probe is: merged the multiple character such as high-frequency, water immersion focusing, burst pulse, echoed signal has short, waveform unimodality of duration of pulse, bandwidth and nominal probe frequency should unanimously wait characteristics with the actual measurement centre frequency, be beneficial to the resolution, sensitivity and the signal to noise ratio (S/N ratio) that improve ultrasonic testing system, more easily find tiny flaw.
Description of drawings
Fig. 1 is the structural representation of this high-frequency narrow-pulse water immersion focusing ultrasonic probe embodiment;
The figure internal label is: 1, joint, 2, shell, 3, backing, 4, cable, 5, piezoelectric chip, 6, sound lens.
Fig. 2 is that the present embodiment of 10MHz and 15MHz detects gained oscillogram and spectrogram.
A is the ultrasonic pulse oscillogram that this routine 15MHz probe produces;
B is the spectrogram of the ultrasonic pulse waveform of this routine 15MHz probe generation
C is the ultrasonic pulse oscillogram that this routine 10MHz probe produces;
D is the spectrogram of the ultrasonic pulse waveform of this routine 10MHz probe generation.
Embodiment
This high-frequency narrow-pulse water immersion focusing ultrasonic probe embodiment as shown in Figure 1, comprise piezoelectric chip 5, backing 3 and shell 2, columnar shell 2 one ends are installed piezoelectric chip 5, the other end is joint 1, the cable 4 that connects piezoelectric chip 5 is drawn from joint 1, the inherent piezoelectric chip of shell 25 rears are equipped with backing 3, in piezoelectric chip 5 the place aheads, shell 2 ends install sound lens 6.The outside of shell 2 is sealing.
This ultrasonic probe is the high-frequency narrow-pulse ultrasonic probe of 10MHz or 15MHz.
Described piezoelectric chip 5 is the little wafer of diameter 6mm.
The high damping backing that described backing 3 is mixed for the tungsten powder of different meshes and epoxy resin.
Described cable 4 is the double layer screen high-frequency coaxial cable.
The EN12668-2:2001 " sign of Non-Destructive Testing-supersonic inspection device and checking-probe " that promulgates with European standard association is as testing standard, and in conjunction with other international standard, and the frequency characteristic of the water logging ultrasonic probe of the present embodiment is tested.This European standard has stipulated that centre frequency soaks the method for testing of the echo frequency characteristic of focusing probe at 0.5～15MHz liquid.
Experimental facilities adopts the automatic ultrasonic detection system that forms based on CTS-04PC ultrasonic inspection card as testing tool, the double-layer coaxial cable of being furnished with simultaneously length 2m, 50 Ω is connected with probe, and use sharp electric pulse incentive probe, the echoed signal of specifying target body to produce is analyzed.Target body adopts the large planar reflector of glass, and the lateral dimension of target body should be wider 10 times at the acoustic beam diameter of focal region end than probe, thick 5 times of Thickness Ratio probe wavelength.So select the thick glass plate of 80mm, 80mm, 30mm that is respectively of length and width as target body.
Installation and measuring instrument and target body, adjust the distance of tested probe and glass plate reflecting body to focal length, the fine setting head angle makes probe axis and echo acoustic beam be in coaxial state, it is maximum that the echo acoustic pressure instantaneous value that returns from the reflecting body upper surface this moment reaches, and collection ultrasonic echo this moment is the waveform of radio-frequency pulse; Recycling discrete type Fourier transform is with gate monitoring reflecting body echo and definite frequency spectrum.Testing result as shown in Figure 2, the C of Fig. 2 and D are respectively ultrasonic pulse oscillogram and the spectrogram that this routine 10MHz probe produces, and can find out that the echoed signal pulse width of the high-frequency narrow-pulse ultrasonic probe of 10MHz only is 140ns, relative bandwidth but has 56%; Be respectively from A and the B of Fig. 2 ultrasonic pulse oscillogram and the spectrogram that this routine 15MHz probe produces, the echoed signal pulse width of the high-frequency narrow-pulse ultrasonic probe of 15MHz is only 70ns, relative bandwidth but has 110%, and have that pulse width is narrow, waveform unimodality, bandwidth should unanimously wait characteristics with the nominal probe frequency with the actual measurement centre frequency.The probe that possesses these characteristics has outstanding flaw detection resolution and the reproduction of data in detection.Can find the tiny flaw of 0.3～0.5mm in the detection of reality.
Above-described embodiment is only the specific case that the purpose of this utility model, technical scheme and beneficial effect are further described, and the utility model is not to be defined in this.All any modifications of making, be equal to replacement, improvement etc., within all being included in protection domain of the present utility model within scope of disclosure of the present utility model.
Claims (6)
1. high-frequency narrow-pulse water immersion focusing ultrasonic probe, comprise piezoelectric chip (5), backing (3) and shell (2), columnar shell (2) one ends are installed piezoelectric chip (5), the other end is joint (1), the cable (4) that connects piezoelectric chip (5) is drawn from joint (1), the inherent piezoelectric chip of shell (2) (5) rear is equipped with backing (3), it is characterized in that:
Described piezoelectric chip (5) the place ahead, shell (2) end installation sound lens (6); The outside of described shell (2) is sealing.
2. high-frequency narrow-pulse water immersion focusing ultrasonic probe according to claim 1 is characterized in that:
Described ultrasonic probe is the high-frequency ultrasonic probe of 8MHz～16MHz.
3. high-frequency narrow-pulse water immersion focusing ultrasonic probe according to claim 2 is characterized in that:
Described ultrasonic probe is the burst pulse ultrasonic probe for generation pulse width 70ns～200ns.
4. the described high-frequency narrow-pulse water immersion focusing of any one ultrasonic probe according to claim 1 to 3 is characterized in that:
Described piezoelectric chip (5) is the little wafer of diameter 5～8mm.
5. the described high-frequency narrow-pulse water immersion focusing of any one ultrasonic probe according to claim 1 to 3 is characterized in that:
Described piezoelectric chip (5) is the lithium titanate material wafer.
6. the described high-frequency narrow-pulse water immersion focusing of any one ultrasonic probe according to claim 1 to 3 is characterized in that:
Described cable (4) is the double layer screen high-frequency coaxial cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220637857 CN202974955U (en) | 2012-11-27 | 2012-11-27 | High frequency short pulse immersion focusing ultrasonic probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220637857 CN202974955U (en) | 2012-11-27 | 2012-11-27 | High frequency short pulse immersion focusing ultrasonic probe |
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| Publication Number | Publication Date |
|---|---|
| CN202974955U true CN202974955U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220637857 Expired - Fee Related CN202974955U (en) | 2012-11-27 | 2012-11-27 | High frequency short pulse immersion focusing ultrasonic probe |
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| CN (1) | CN202974955U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308606A (en) * | 2013-06-06 | 2013-09-18 | 吴来政 | Transverse wave focusing and flushing ultrasonic probe |
| CN105021170A (en) * | 2015-07-15 | 2015-11-04 | 常州市常超电子研究所有限公司 | Water immersion line focusing probe |
| CN108195944A (en) * | 2017-12-25 | 2018-06-22 | 常州常宝精特钢管有限公司 | A kind of oblique wound of tube body is popped one's head in and failure detector |
| CN111220708A (en) * | 2019-12-05 | 2020-06-02 | 中国航空工业集团公司济南特种结构研究所 | Ultrasonic C scanning detection method for foam sandwich structure radar cover |
| CN111812622A (en) * | 2020-07-09 | 2020-10-23 | 聚融医疗科技(杭州)有限公司 | Ultrasonic probe bandwidth detection method and system based on lens echo |
-
2012
- 2012-11-27 CN CN 201220637857 patent/CN202974955U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308606A (en) * | 2013-06-06 | 2013-09-18 | 吴来政 | Transverse wave focusing and flushing ultrasonic probe |
| CN103308606B (en) * | 2013-06-06 | 2015-07-08 | 吴来政 | Transverse wave focusing and flushing ultrasonic probe |
| CN105021170A (en) * | 2015-07-15 | 2015-11-04 | 常州市常超电子研究所有限公司 | Water immersion line focusing probe |
| CN108195944A (en) * | 2017-12-25 | 2018-06-22 | 常州常宝精特钢管有限公司 | A kind of oblique wound of tube body is popped one's head in and failure detector |
| CN111220708A (en) * | 2019-12-05 | 2020-06-02 | 中国航空工业集团公司济南特种结构研究所 | Ultrasonic C scanning detection method for foam sandwich structure radar cover |
| CN111812622A (en) * | 2020-07-09 | 2020-10-23 | 聚融医疗科技(杭州)有限公司 | Ultrasonic probe bandwidth detection method and system based on lens echo |
| CN111812622B (en) * | 2020-07-09 | 2023-10-31 | 聚融医疗科技(杭州)有限公司 | Ultrasonic probe bandwidth detection method and system based on lens echo |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20131127 |