CN107064314A - The lossless filtering method of ultrasonic signal - Google Patents
The lossless filtering method of ultrasonic signal Download PDFInfo
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- CN107064314A CN107064314A CN201710347900.7A CN201710347900A CN107064314A CN 107064314 A CN107064314 A CN 107064314A CN 201710347900 A CN201710347900 A CN 201710347900A CN 107064314 A CN107064314 A CN 107064314A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/449—Statistical methods not provided for in G01N29/4409, e.g. averaging, smoothing and interpolation
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Abstract
The present invention relates to the method that ultrasonic signal removes noise, to combine practical application, the lossless filtering technique of ultrasonic wave useful signal is realized, i.e., useful signal keeps constant when weakening noise signal, the signal to noise ratio of signal is greatly enhanced, and realizes raising of the ultrasonic wave to damaged structure positioning precision.Therefore, the technical solution adopted by the present invention is, all data with transmitted waveform in the ultrasound data of collection are overlapped rear averaged, formula is as follows by the lossless filtering method of ultrasonic signal according to waveform corresponding relation：In i=1,2,3...m (1) formula：ViFor the ultrasonic average amplitude size of i-th of collection point of effective waveform；VijFor the ultrasonic amplitude size of i-th of collection point in j-th of waveform；N is the quantity of effective waveform, and m is the quantity of collection point in an effective waveform.Present invention is mainly applied to the conjunction of ultrasonic signal denoising sound field.
Description
Technical field
The present invention relates to the method that ultrasonic signal removes noise, belong to engineering science field, specifically, be related to ultrasonic signal
Lossless filtering method.
Background technology
In nearest many decades, supersonic guide-wave is widely used in structural damage detection, and it is to apply damaged structure back wave arteries and veins
The positioning of damaged structure is realized in punching.But in data acquisition, due to there is many disturbing factors so that in the data of collection
There are many noise signals, noise is poor, especially in ultrasonic wave positioning experiment, when supersonic sounding device distance damage position
When putting farther out, echo-signal is almost flooded by noise, and damage reason location precision is substantially reduced or even can not positioned.It is traditional in application
During filtering method, such as Fourier filtering, gaussian filtering, round and smooth filtering, while noise signal is removed, useful signal
By different degrees of weakening, the precision of ultrasonic wave positioning has been had a strong impact on.For such case, a kind of useful signal is set up lossless
Filtering method, to ultrasonic injury positioning and other side using significant.
The multi-fold of seismic wave is exactly that similarly hereinafter deep point carries out multiplicating observation altogether over the ground, then by static correction,
It is overlapped after velocity analysis and dynamic correction process, strengthens primary reflection, and then improves signal to noise ratio, is intricately
The fine granularing scalability of layer provides high-quality seismic data.Multi-fold technology of the invention according to seismic wave, to ultrasound data
Multi collect (extension acquisition time) is carried out, then by all data with transmitted waveform in the data of collection according to waveform pair
It should be related to and be overlapped rear averaged, reach weakening noise, improve the purpose of signal to noise ratio.
The content of the invention
To overcome the shortcomings of existing ultrasonic acquisition technology, there is noise and at present existing filtering skill for ultrasonic signal
Art is the characteristics of useful signal is also weakened severely while noise signal is removed, it is contemplated that with reference to practical application, realizing
The lossless filtering technique of ultrasonic wave useful signal, i.e., when weakening noise signal, useful signal keeps constant, is greatly enhanced letter
Number signal to noise ratio, and realize raising of the ultrasonic wave to damaged structure positioning precision.Therefore, the technical solution adopted by the present invention is,
The lossless filtering method of ultrasonic signal, by all data with transmitted waveform in the ultrasound data of collection according to waveform correspondence
Relation is overlapped rear averaged, and formula is as follows：
In formula：ViFor the ultrasonic average amplitude size of i-th of collection point of effective waveform；VijFor in j-th of waveform
The ultrasonic amplitude size of i-th of collection point；N is the quantity of effective waveform, and m is the quantity of collection point in an effective waveform.
In an example, comprise the following steps that：
1) ultrasonic collecting device is applied, the sine wave in 5 cycles with Hanning window is selected as pumping signal, it is right respectively
One damage pipeline and the collection of identical not damaged pipeline are multigroup with transmitted waveform data, and obtain echo with one group of data of collection
Signal；
2) using formula (1) to asking for echo-signal after the multi-group data processing of collection；
3) one group of transmitted wave signal, received wave signal, step 2 respectively to not damaged pipeline) processing after transmitted wave signal,
The echo-signal of received wave signal and each self-corresponding damage pipeline is done Eugene Wigner-Weir Time-Frequency Analysis Method and calculated, and draws
Isogram；
4) applied energy maximum differentiates ultrasonic wave then, and damage position is calculated using the positioning principle of ultrasonic wave.
The features of the present invention and beneficial effect are：
The lossless filtering of ultrasonic wave useful signal can be realized by the present invention, i.e., effectively believed when weakening noise signal
Number holding is constant, the signal to noise ratio of signal is effectively improved, in positioning of the ultrasonic wave to damaged structure so that ultrasonic wave time frequency analysis
Energy maximum it is more easy to identify, effectively improve positioning precision.
Brief description of the drawings：
In the ultrasonic wave comparison of wave shape curve of Fig. 1 present invention before and after the processing, figure：
(a) transmission signal wavy curve after before processing transmission signal wavy curve (b) present invention processing of the present invention
(c) before processing of the present invention receives signal waveform curve (d) present invention processing and is followed by collection of letters wavy curve
(e) before processing echo-signal wavy curve (f) present invention processing back echo signal waveform curve of the present invention.
The Eugene Wigner of Fig. 2 primary signals-Weir time-frequency energy profile.
Eugene Wigner-Weir time-frequency energy profile after Fig. 3 primary signals are processed by the invention.
Fig. 4 flow charts of the present invention.
Embodiment
The present situation lost for useful signal in existing ultrasonic wave filtering method, the present invention provides a kind of ultrasonic wave and effectively believed
Number lossless eliminating noise method.The content of the invention is as follows：
According to the multi-fold Observation principle of seismic prospecting, the ultrasound data of collection is made full use of, by the data of collection
In have transmitted waveform all data be overlapped rear averaged according to waveform corresponding relation, due to useful signal (hair
Penetrate signal, receive signal, echo-signal) it is fixed, and noise signal is random, therefore effectively believe in the signal after superposition
Number holding is constant, and noise signal is weakened (by weakening of averaging), and which improves signal to noise ratio, (data are got over
Many, it is bigger that signal to noise ratio is improved), formula is as follows：
In formula：ViFor the ultrasonic average amplitude size of i-th of collection point of effective waveform；VijFor in j-th of waveform
The ultrasonic amplitude size of i-th of collection point；N is the quantity of effective waveform, and m is the quantity of collection point in an effective waveform.
The present invention is further described with reference to instantiation.
Using present invention combination method for ultrasonic locating, the present invention is illustrated, comprised the following steps that：
1. applying ultrasonic collecting device, the sine wave in 5 cycles with Hanning window is selected as pumping signal, it is right respectively
One damage pipeline and the collection of identical not damaged pipeline are multigroup with transmitted waveform data, and obtain echo with one group of data of collection
Signal (Fig. 1 e)；
2. application the inventive method after the multi-group data processing of collection to asking for echo-signal (Fig. 1 f)；
3. one group of transmitted wave signal (Fig. 1 a) of not damaged pipeline, received wave signal (Fig. 1 c), the present invention are handled respectively
The echo-signal of transmitted wave signal (Fig. 1 b), received wave signal (Fig. 1 d) and each self-corresponding damage pipeline does Eugene Wigner-prestige afterwards
You calculate Time-Frequency Analysis Method, and drawing isoline figure (Fig. 2, Fig. 3)；
4. applied energy maximum differentiates ultrasonic wave then, damage position (table is calculated using the positioning principle of ultrasonic wave
1)。
The damaged structure positioning result contrast table before and after the processing of the invention of table 1
From figure 1 it appears that after present invention processing, the effective information of ultrasonic signal keeps constant, noise signal quilt
Substantially weaken, signal to noise ratio is significantly improved, Fig. 2 and Fig. 3 contrasts are it can be found that the echo-signal after present invention processing is through dimension
The energy maximum that Ge Na-Weir time-frequency distributions method is calculated is more easy to identify, as can be found from Table 1, super after present invention processing
Acoustic location precision is significantly improved.
Claims (2)
1. a kind of lossless filtering method of ultrasonic signal, it is characterized in that, will there is transmitted waveform in the ultrasound data of collection
All data are overlapped rear averaged according to waveform corresponding relation, and formula is as follows：
<mrow>
<msub>
<mi>V</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>j</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>N</mi>
</munderover>
<msub>
<mi>V</mi>
<mrow>
<mi>i</mi>
<mi>j</mi>
</mrow>
</msub>
<mo>/</mo>
<mi>N</mi>
<mo>,</mo>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>,</mo>
<mn>3</mn>
<mo>...</mo>
<mi>m</mi>
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In formula：ViFor the ultrasonic average amplitude size of i-th of collection point of effective waveform；VijFor i-th in j-th of waveform
The ultrasonic amplitude size of collection point；N is the quantity of effective waveform, and m is the quantity of collection point in an effective waveform.
2. the lossless filtering method of ultrasonic signal as claimed in claim 1, it is characterized in that, in an example, specific steps
It is as follows：
1) ultrasonic collecting device is applied, selects the sine wave in 5 cycles with Hanning window as pumping signal, is damaged respectively to one
Hinder pipeline and the collection of identical not damaged pipeline is multigroup with transmitted waveform data, and echo is obtained with one group of data of collection and believe
Number；
2) using formula (1) to asking for echo-signal after the multi-group data processing of collection；
3) one group of transmitted wave signal, received wave signal, step 2 respectively to not damaged pipeline) processing after transmitted wave signal, receive
The echo-signal of ripple signal and each self-corresponding damage pipeline is done Eugene Wigner-Weir Time-Frequency Analysis Method and calculated, and draws equivalence
Line chart；
4) applied energy maximum differentiates ultrasonic wave then, and damage position is calculated using the positioning principle of ultrasonic wave.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872402A (en) * | 2018-05-08 | 2018-11-23 | 天津大学 | Ultrasonic wave Butterworth, Hanning window combination with hinder filtering method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782555A (en) * | 2010-01-15 | 2010-07-21 | 北京工业大学 | Guided wave signal analyzing method based on time delay |
| CN103713054A (en) * | 2013-12-30 | 2014-04-09 | 江苏大学 | Guide wave characteristic signal extraction method for near weld zone defect of pipeline |
| CN106248795A (en) * | 2015-06-12 | 2016-12-21 | 富士重工业株式会社 | Ultrasonic fault detection system, defect detection on ultrasonic basis and airframe body |
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2017
- 2017-05-17 CN CN201710347900.7A patent/CN107064314A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782555A (en) * | 2010-01-15 | 2010-07-21 | 北京工业大学 | Guided wave signal analyzing method based on time delay |
| CN103713054A (en) * | 2013-12-30 | 2014-04-09 | 江苏大学 | Guide wave characteristic signal extraction method for near weld zone defect of pipeline |
| CN106248795A (en) * | 2015-06-12 | 2016-12-21 | 富士重工业株式会社 | Ultrasonic fault detection system, defect detection on ultrasonic basis and airframe body |
Non-Patent Citations (1)
| Title |
|---|
| 何富存等: "基于小波变换及Wigner-Ville变换方法的超声导波信号分析", 《实验力学》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872402A (en) * | 2018-05-08 | 2018-11-23 | 天津大学 | Ultrasonic wave Butterworth, Hanning window combination with hinder filtering method |
| CN108872402B (en) * | 2018-05-08 | 2021-08-06 | 天津大学 | Ultrasonic Butterworth and Hanning window combined band-stop filtering method |
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Application publication date: 20170818 |