CN205404489U - System for detect with reversal focus of linear FM pulse excitation technological improvement supersound time - Google Patents
System for detect with reversal focus of linear FM pulse excitation technological improvement supersound time Download PDFInfo
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- CN205404489U CN205404489U CN201620128433.XU CN201620128433U CN205404489U CN 205404489 U CN205404489 U CN 205404489U CN 201620128433 U CN201620128433 U CN 201620128433U CN 205404489 U CN205404489 U CN 205404489U
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- 230000005284 excitation Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
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- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model provides a system for detect with reversal focus of linear FM pulse excitation technological improvement supersound time, includes computer, signal generator, power amplifier, oscilloscope, transmitting transducer and receiving transducer, computer and oscilloscope link to each other, and oscilloscope passes through the GPIB data line with signal generator and is connected, and signal generator is used for exporting linear FM pulse signal to power amplifier, and power amplifier and transmitting transducer link to each other, detect the signal in the medium that awaits measuring and give oscilloscope through the receiving transducer, and oscilloscope is used for showing initial signal of receiving of receiving transducer and the time focus signal later that reverses. The utility model discloses utilizing the linear FM pulse excitation technique to detect to the reversal focus of supersound time and improving, improve the effect to crackle focus, improved crack detection's quality and precision, this makes its effective use in the measuring of big aircraft material of country and automotive material, and this even running to ensuring safety production and economy has important meaning.
Description
Technical field
This utility model belongs to signal processing and ultrasonic detecting technology field, and especially a kind of chirp excitation technique improves the system of ultrasonic time reversion focus detection.
Background technology
At present, in the process of Ultrasonic NDT, time reversal, the application of technology was more and more extensive, and time reversal is one of application of sound reciprocity principle, it is possible to make acoustic wave energy focus on over time and space, and realizes the signal reconstruction at sound source position.In the process of time reversal, traditional method is typically chosen single pulse signal as pumping signal, but, energy entrained by single pulse signal is relatively low, the impulse response surveyed after detecting the transmission of medium can not provide sufficiently strong reception signal, this will cause poor signal to noise ratio, and affect the effect to crackle focusing and imaging, reduce quality and the precision of crack detection.
Utility model content
The purpose of this utility model be for conventional ultrasound detect in using single pulse signal as pumping signal time, the problem that focus signal signal to noise ratio is relatively low, propose employing chirp excitation technique to provide pumping signal, and then improve the quality of signal focus detection and imaging.
The technical solution of the utility model is:
A kind of chirp excitation technique improves the system of ultrasonic time reversion focus detection, and it includes computer, signal generator, power amplifier, oscillograph, transmitting transducer and reception transducer；
Described computer arranges the mid frequency f of the chirp pulse signal that signal generator sends, signal period T, sweep bandwidth B, amplitude A by LabVIEW software and controls oscillographic display, and computer is connected with signal generator, oscillograph by data wire；
Described signal generator is for output linearity chirp signal to power amplifier, and it is connected by USB data line with computer, and signal generator is connected by GPIB data wire with oscillograph；
Described power amplifier is used for amplifying chirp pulse signal, and its signal output part is connected with transmitting transducer；
Described transmitting transducer is for by the chirp pulse signal output after amplification to testing medium, and reception transducer is used for detecting testing medium, and it is connected with oscillograph by data wire, gives oscillograph by the signal in the medium received；
Described oscillograph is for showing the signal receiving transducer reception and the focus signal after time reversal.
Transmitting transducer of the present utility model and reception transducer are ultrasonic probe.
The model of signal generator of the present utility model is AWG2021.
The beneficial effects of the utility model:
This utility model utilizes chirp excitation technique to improve for ultrasonic time reversion focus detection, the effect that crackle is focused on can be improved, improve quality and the precision of crack detection, this makes it can effectively be applied in the detection of the big aircraft materials of country and auto industry material, and this is to guaranteeing safe production and the even running of economy has great significance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Detailed description of the invention
Below in conjunction with drawings and Examples, this utility model is further described.
As it is shown in figure 1, the application of this chirp excitation technique a kind of, it is based on Ultrasonic NDT experimental platform system and realizes.The hardware components of this experiment porch is made up of computer, signal generator, power amplifier, oscillograph, ultrasonic transducer etc., and system connects block diagram and sees Fig. 1.By LabVIEW program development and design on software, realize the control to hardware system, and by the application of technology various time reversal, such as time reversal (TimeReversal:TR), inverse filtering (InverseFilter:IF) and 1 treatment technology (1BitProcessing) etc., realize the detection of focus signal.
When being embodied as:
S1, employing computer control signal generator produce chirp pulse signal s (t), and it is the chirp signal that an instantaneous frequency is linearly increasing, and expression formula is as follows:
Wherein, A is the amplitude of signal source, frequency centered by f, and T is the signal period, and B is sweep bandwidth；
Chirp pulse signal is to be produced by the LabVIEW software programming on computer, sets the mid frequency f of this signal, signal period T, sweep bandwidth B and amplitude A by LabVIEW programming in a computer；
S2, aforementioned input signal s (t) are sent in testing medium by transmitting transducer after power amplifier amplifies and excite generation sound wave, and sound wave is propagated in testing medium, and is received by the reception transducer at opposite side；
S3, reception transducer received signal are delivered to oscillograph and are sent to computer, signal after this reversion is launched to testing medium after processing by elapsed time inversion technique again by transmitting transducer in a computer, testing medium realizes the focusing of signal, this focus signal is by receiving transducer detection, in the process, the signal that oscilloscope display reception transducer receives first and the focus signal after time reversal.
This utility model is not directed to part and all same as the prior art prior art maybe can be adopted to be realized.
Claims (3)
1. improve a system for ultrasonic time reversion focus detection with chirp excitation technique, it is characterized in that it includes computer, signal generator, power amplifier, oscillograph, transmitting transducer and reception transducer；
Described computer arranges the mid frequency f of the chirp pulse signal that signal generator sends, signal period T, sweep bandwidth B, amplitude A by LabVIEW software and controls oscillographic display, and computer is connected with signal generator, oscillograph by data wire；
Described signal generator is for output linearity chirp signal to power amplifier, and it is connected by USB data line with computer, and signal generator is connected by GPIB data wire with oscillograph；
Described power amplifier is used for amplifying chirp pulse signal, and its signal output part is connected with transmitting transducer；
Described transmitting transducer is for by the chirp pulse signal output after amplification to testing medium, and reception transducer is used for detecting testing medium, and it is connected with oscillograph by data wire, gives oscillograph by the signal in the medium received；
Described oscillograph is for showing the signal receiving transducer reception and the focus signal after time reversal.
2. chirp excitation technique according to claim 1 improves the system of ultrasonic time reversion focus detection, it is characterized in that described transmitting transducer and reception transducer are ultrasonic probe.
3. chirp excitation technique according to claim 1 improves the system of ultrasonic time reversion focus detection, it is characterized in that the model of described signal generator is AWG2021.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620128433.XU CN205404489U (en) | 2016-02-19 | 2016-02-19 | System for detect with reversal focus of linear FM pulse excitation technological improvement supersound time |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620128433.XU CN205404489U (en) | 2016-02-19 | 2016-02-19 | System for detect with reversal focus of linear FM pulse excitation technological improvement supersound time |
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| CN205404489U true CN205404489U (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620128433.XU Expired - Fee Related CN205404489U (en) | 2016-02-19 | 2016-02-19 | System for detect with reversal focus of linear FM pulse excitation technological improvement supersound time |
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| CN (1) | CN205404489U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109564078A (en) * | 2016-05-13 | 2019-04-02 | 奥尔特技术公司 | A kind of system and method for cleaning equipment |
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2016
- 2016-02-19 CN CN201620128433.XU patent/CN205404489U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109564078A (en) * | 2016-05-13 | 2019-04-02 | 奥尔特技术公司 | A kind of system and method for cleaning equipment |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160727 Termination date: 20170219 |