CN103808809B - A kind of ultrasound echo signal real-time processing device based on linear FM signal excitation and disposal route - Google Patents
A kind of ultrasound echo signal real-time processing device based on linear FM signal excitation and disposal route Download PDFInfo
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Abstract
Based on ultrasound echo signal real-time processing device and the disposal route of linear FM signal excitation, relate to welded structure technical field of quality detection.The process of pulse-compression of ultrasound echo signal that the invention solves the excitation of existing linear FM signal is carried out on PC, cause treating apparatus volume large, be not easy to the problem of carrying.The present invention adopts ultrasonic probe to convert the ultrasonic signal received to electric signal, via pre-amplifier unit, signal is amplified, the simulating signal collected is converted to digital signal again through signal gathering unit one, synchronous signal collecting unit two will gather pumping signal, and convert digital signal to, ultrasonic signal after conversion and pumping signal send real time signal processing unit to, do process of pulse-compression, result is sent to external communication interface via real time signal processing unit.It can be used in the ultrasonic detection equipment encouraged by linear FM signal.
Description
Technical field
The present invention relates to a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation and realize the disposal route of signal.Belong to welded structure technical field of quality detection.
Background technology
Linear FM signal has the feature of the emissive power of very strong anti-multipath jamming and target defect resolution characteristic, very strong anti-noise jamming ability and reduction signal in Ultrasonic Detection welded structure, and is conducive to the miniaturization of ultrasonic probe.The Ultrasonic Detection of linear FM signal excitation can improve defect recognition precision in welded structure, can solve the contradiction of ultrasound wave sound wave penetration depth and detection resolution in heavy thickness welded structure detects, can improve the signal to noise ratio (S/N ratio) of coarse grain material Ultrasonic Detection.But the ultrasound echo signal of linear FM signal excitation is wide pulse signal, needs just can apply in practice after process of pulse-compression.The process of pulse-compression of the ultrasound echo signal of existing linear FM signal excitation generally on PC by software simulating such as matlab, arithmetic speed relies on the performance of PC, therefore need a kind of can the process of pulse-compression based on hardware chip of PC, be convenient to the miniaturization of equipment.
Summary of the invention
The present invention is that the process of pulse-compression in order to solve the ultrasound echo signal that existing linear FM signal encourages is carried out on PC, cause treating apparatus volume large, be not easy to carry, and the device of existing butt welded seam Ultrasonic Detection is low and poor accuracy to the accuracy of detection of defect in welded structure, the problem of the input difficulty in butt welded seam Ultrasonic Detection field.And propose a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation and disposal route.
Based on a ultrasound echo signal real-time processing device for linear FM signal excitation, it comprises ultrasonic probe, and it also comprises pre-amplifier unit, signal gathering unit one, signal gathering unit two and real time signal processing unit,
Ultrasonic probe, for scanning welded structure to be detected, gathering the ultrasound echo signal through welded structure reflection, and collection result is sent to pre-amplifier unit,
Described pre-amplifier unit, for amplifying the electric signal received, and passes to signal gathering unit one by amplification result,
Described signal gathering unit one, after converting the signal of reception to digital signal, sends this digital signal to real time signal processing unit as digital echo signal;
Signal collecting unit two, signals collecting is carried out for together walking with described signal gathering unit, gather the pumping signal of the ultrasonic probe producing detection ultrasonic signal, and send real time signal processing unit to as digital stimulus signal after converting thereof into digital signal;
Described real time signal processing unit, for doing process of pulse-compression to all signals received, is then sent to external communication interface,
Real time signal processing unit comprises signal operation module one, signal operation module two, signal Fourier transform module, signal operation module three, signal inverse Fourier transform module and result optimizing module;
Signal operation module one, for carrying out conjugated signal process to the digital stimulus signal received, obtaining the conjugated signal of digital stimulus signal, and this conjugated signal is sent to signal operation module two;
Signal operation module two, for overturning along about Z-axis receiving conjugated signal, obtaining the conjugated signal of the digital stimulus signal of upset, and the conjugated signal of this upset is sent to signal Fourier transform module;
Signal Fourier transform module, for receiving the conjugated signal of upset and the digital echo signal through signal gathering unit one output, and the conjugated signal received and digital echo signal are done Fourier transform, obtain Fourier transform data and send to signal operation module three;
Signal operation module three, for carrying out the Fourier transform data received, data are point-to-point to be multiplied, and obtain the data that are multiplied, and the data that this are multiplied sends to signal inverse Fourier transform module;
Signal inverse Fourier transform module, for carrying out inverse Fourier transform to the data that are multiplied received, obtaining inverse Fourier transform data and sending to result optimizing module;
Result optimizing module, for carrying out Hilbert transform to the inverse Fourier transform data received, the signal after conversion exports as the output signal of real time signal processing unit;
The ultrasonic probe of described generation detection ultrasonic signal, refer to when detecting welded structure, for generation of the ultrasonic probe of ultrasonic excitation signals, that is: what signal collecting unit two gathered is the ultrasonic excitation signals in testing process, and signal gathering unit one synchronous acquisition is through welded ultrasonic echo signal to be detected;
The output that signal is the all-pass filter of 1 by an amplitude is regarded in Hilbert transform as, and signal is after this conversion, and positive frequency component does the phase shift of-90 °, and negative frequency component does the phase shift of+90 °.
Adopt a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation to realize real time signal processing method, described method comprises:
Real time signal processing unit carries out conjugated signal process to the digital stimulus signal received, and obtains the step of the conjugated signal of digital stimulus signal;
Real time signal processing unit overturns along about Z-axis the conjugated signal of the digital stimulus signal received, and obtains the step of the conjugated signal of the digital stimulus signal of upset,
Real time signal processing unit, to the conjugated signal of the digital stimulus signal of the upset received and digital ultrasound echoed signal, does the step of Fourier transform,
Real time signal processing unit carries out to the Fourier transform data received that data are point-to-point to be multiplied, and obtains the step of the data that are multiplied,
Real time signal processing unit carries out the step of inverse Fourier transform to the data that are multiplied received,
Real time signal processing unit carries out Hilbert transform to the inverse Fourier transform data received, and obtains the step of ultrasonic echo compression processing signals.
The present invention adopts ultrasonic probe to convert the ultrasonic signal received to electric signal, via pre-amplifier unit, signal is amplified, the simulating signal collected is converted to digital signal again through signal gathering unit one, synchronous signal collecting unit two will gather pumping signal, and convert digital signal to, ultrasonic signal after conversion and pumping signal send real time signal processing unit to, do process of pulse-compression, result is sent to external communication interface via real time signal processing unit; This device carries out pulse signal process by real time signal processing unit, and therefore the volume of whole device is little, is easy to carry, on year-on-year basis existing employing PC do process of pulse-compression device volume want little more than one times.It can be used in the ultrasonic detection equipment encouraged by linear FM signal.
Accompanying drawing explanation
Fig. 1 is a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation described in embodiment one and the view of host computer;
Fig. 2 is the principle schematic of the real time signal processing unit described in embodiment two;
Fig. 3 is the signal processing flow figure of the real time signal processing unit described in embodiment six.
Embodiment
Embodiment one: illustrate present embodiment with reference to Fig. 1, a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation described in present embodiment, it comprises ultrasonic probe 1, it also comprises pre-amplifier unit 2, signal gathering unit 1, signal gathering unit 24 and real time signal processing unit 5
Ultrasonic probe 1, for scanning welded structure to be detected, gathering the ultrasound echo signal through welded structure reflection, and collection result is sent to pre-amplifier unit 2,
Described pre-amplifier unit 2, for amplifying the electric signal received, and passes to signal gathering unit 1 by amplification result,
Described signal gathering unit 1, after converting the signal of reception to digital signal, sends this digital signal to real time signal processing unit 5 as digital echo signal;
Signal collecting unit 24, for synchronously carrying out signals collecting with described signal gathering unit 1, gather the pumping signal of the ultrasonic probe producing detection ultrasonic signal, and send real time signal processing unit 5 to as digital stimulus signal after converting thereof into digital signal
Described real time signal processing unit 5, for doing process of pulse-compression to all signals received, is then sent to external communication interface.
The ultrasonic probe of described generation detection ultrasonic signal, refers to when detecting welded structure, for generation of the ultrasonic probe of ultrasonic excitation signals.That is: what signal collecting unit 24 gathered is the ultrasonic excitation signals in testing process, and signal gathering unit 1 synchronous acquisition is through welded ultrasonic echo signal to be detected.
Device described in present embodiment can independently use, and also this device can be embedded in existing ultrasonic detection equipment and use.
In device described in present embodiment, the data that real time signal processing unit 5 obtains can be exported by external communication interface, this external communication interface can adopt existingly variously walks communication interface, can be connected with the smart machine such as computing machine with Data Analysis Services function by this external communication interface in actual applications, realize the output detecting data.
Having the smart machines such as the computing machine of Data Analysis Services function can be the desktop operating system operating in PC and Mac machine: MacOSX, Linux issues version (as Debian, Ubuntu, LinuxMint, openSUSE, Fedora etc.), WindowsXP, WindowsVista, Windows7, Windows8; Can also be operate in the conventional operating system of built-in field: built-in Linux, WindowsEmbedded, VxWorks; Can also be the operating system operating in the consumption electronic product such as smart mobile phone or panel computer: Android, iOS, Symbian, WindowsPhone and BlackBerryOS.
Embodiment two: illustrate present embodiment with reference to Fig. 2, the difference of a kind of ultrasound echo signal real-time processing device encouraged based on linear FM signal described in present embodiment and embodiment one is, real time signal processing unit 5 comprises signal operation module one 5-1, signal operation module two 5-2, signal Fourier transform module 5-3, signal operation module three 5-4, signal inverse Fourier transform module 5-5 and result optimizing module 5-6;
Signal operation module one 5-1, for carrying out conjugated signal process to the digital stimulus signal received, obtaining the conjugated signal of digital stimulus signal, and this conjugated signal is sent to signal operation module two 5-2;
Signal operation module two 5-2, for overturning along about Z-axis receiving conjugated signal, obtaining the conjugated signal of the digital stimulus signal of upset, and the conjugated signal of this upset is sent to signal Fourier transform module 5-3;
Signal Fourier transform module 5-3, for receiving the conjugated signal of upset and the digital echo signal through signal gathering unit 1 output, and the conjugated signal received and digital echo signal are done Fourier transform, obtain Fourier transform data and send to signal operation module three 5-4;
Signal operation module three 5-4, for carrying out the Fourier transform data received, data are point-to-point to be multiplied, and obtain the data that are multiplied, and the data that this are multiplied sends to signal inverse Fourier transform module 5-5;
Signal inverse Fourier transform module 5-5, for carrying out inverse Fourier transform to the data that are multiplied received, obtaining inverse Fourier transform data and sending to result optimizing module 5-6;
Result optimizing module 5-6, for carrying out Hilbert transform to the inverse Fourier transform data received, the signal after conversion exports as the output signal of real time signal processing unit 5.
Above-mentioned Fourier transform and Hilbert transform be existing two kinds of conventional data processing technique means such as:
In present embodiment, signal Fourier transform module 5-3 does Fourier transform to the conjugated signal received and digital echo signal, by integral operation f (t) Fourier transform formula:
obtain Fourier transform data F (ω), then pass through the inverse Fourier transform formula of integral operation F (ω):
obtain inverse Fourier transform data f (t), wherein, ω is angular frequency, i, t are natural number, and f (t) is the periodic function of t, if t meets: have limited discontinuous point in one-period, and on these discontinuous points, function is finite value; There is limited extreme point in one-period;
When inverse Fourier transform data s (t) is input in result optimizing module, in result optimizing module, carry out Hilbert transform, after conversion, output signal is designated as
claim
for the Hilbert transform of s (t), its formula is:
the Hilbert transform of signal s (t) can regard the output that signal is the all-pass filter of 1 by an amplitude as, and signal s (t) is after this conversion, and positive frequency component does the phase shift of-90 °, and negative frequency component does the phase shift of+90 °.
Embodiment three: the difference of a kind of ultrasound echo signal real-time processing device encouraged based on linear FM signal described in present embodiment and embodiment one is, ultrasonic probe 1 is the one in ultrasonic normal probe, ultrasonic double crystal probe, ultrasonic angle probe, focus ultrasonic probe, ultrasonic band curvature probe or ultrasonic surface wave probe.
Embodiment four: the difference of a kind of ultrasound echo signal real-time processing device encouraged based on linear FM signal described in present embodiment and embodiment one is, signal gathering unit 1 and signal gathering unit 24 all adopt A/D conversion chip to realize.
Embodiment five: the difference of a kind of ultrasound echo signal real-time processing device encouraged based on linear FM signal described in present embodiment and embodiment one is, the chip that real time signal processing unit 5 adopts is DSP digital signal processing chip or FPGA field programmable gate array chip.
Embodiment six: illustrate present embodiment with reference to Fig. 3, adopt a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation described in embodiment one to realize real time signal processing method, described method comprises:
Real time signal processing unit 5 carries out conjugated signal process to the digital stimulus signal received, and obtains the step of the conjugated signal of digital stimulus signal;
Real time signal processing unit 5 overturns along about Z-axis the conjugated signal of the digital stimulus signal received, and obtains the step of the conjugated signal of the digital stimulus signal of upset,
Real time signal processing unit 5, to the conjugated signal of the digital stimulus signal of the upset received and digital ultrasound echoed signal, does the step of Fourier transform,
Real time signal processing unit 5 carries out to the Fourier transform data received that data are point-to-point to be multiplied, and obtains the step of the data that are multiplied,
Real time signal processing unit 5 carries out the step of inverse Fourier transform to the data that are multiplied received,
Real time signal processing unit 5 carries out Hilbert transform to the inverse Fourier transform data received, and obtains the step of ultrasonic echo compression processing signals.
Claims (5)
1. the ultrasound echo signal real-time processing device based on linear FM signal excitation, it comprises ultrasonic probe (1), it is characterized in that, it also comprises pre-amplifier unit (2), signal gathering unit one (3), signal gathering unit two (4) and real time signal processing unit (5)
Ultrasonic probe (1), for scanning welded structure to be detected, gathering the ultrasound echo signal through welded structure reflection, and collection result being sent to pre-amplifier unit (2),
Described pre-amplifier unit (2), for amplifying the electric signal received, and passes to signal gathering unit one (3) by amplification result,
Described signal gathering unit one (3), after converting the signal of reception to digital signal, sends this digital signal to real time signal processing unit (5) as digital echo signal;
Signal collecting unit two (4), for synchronously carrying out signals collecting with described signal gathering unit one (3), gather the pumping signal of the ultrasonic probe producing detection ultrasonic signal, and send real time signal processing unit (5) to as digital stimulus signal after converting thereof into digital signal
Described real time signal processing unit (5), for doing process of pulse-compression to all signals received, is then sent to external communication interface;
Real time signal processing unit (5) comprises signal operation module one (5-1), signal operation module two (5-2), signal Fourier transform module (5-3), signal operation module three (5-4), signal inverse Fourier transform module (5-5) and result optimizing module (5-6);
Signal operation module one (5-1), for carrying out conjugated signal process to the digital stimulus signal received, obtaining the conjugated signal of digital stimulus signal, and this conjugated signal is sent to signal operation module two (5-2);
Signal operation module two (5-2), for overturning along about Z-axis receiving conjugated signal, obtaining the conjugated signal of the digital stimulus signal of upset, and the conjugated signal of this upset is sent to signal Fourier transform module (5-3);
Signal Fourier transform module (5-3), for the conjugated signal that receives upset and the digital echo signal exported through signal gathering unit one (3), and the conjugated signal received and digital echo signal are done Fourier transform, obtain Fourier transform data and send to signal operation module three (5-4);
Signal operation module three (5-4), for carrying out the Fourier transform data received, data are point-to-point to be multiplied, and obtain the data that are multiplied, and the data that this are multiplied sends to signal inverse Fourier transform module (5-5);
Signal inverse Fourier transform module (5-5), for carrying out inverse Fourier transform to the data that are multiplied received, obtaining inverse Fourier transform data and sending to result optimizing module (5-6);
Result optimizing module (5-6), for carrying out Hilbert transform to the inverse Fourier transform data received, the signal after conversion exports as the output signal of real time signal processing unit (5);
The ultrasonic probe of described generation detection ultrasonic signal, refer to when detecting welded structure, for generation of the ultrasonic probe of ultrasonic excitation signals, that is: what signal collecting unit two (4) gathered is the ultrasonic excitation signals in testing process, and signal gathering unit one (3) synchronous acquisition is through welded ultrasonic echo signal to be detected;
The output that signal is the all-pass filter of 1 by an amplitude is regarded in Hilbert transform as, and signal is after this conversion, and positive frequency component does the phase shift of-90 °, and negative frequency component does the phase shift of+90 °.
2. a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation according to claim 1, it is characterized in that, ultrasonic probe (1) is the one in ultrasonic normal probe, ultrasonic double crystal probe, ultrasonic angle probe, focus ultrasonic probe, ultrasonic band curvature probe or ultrasonic surface wave probe.
3. a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation according to claim 1, it is characterized in that, signal gathering unit one (3) and signal gathering unit two (4) all adopt A/D conversion chip to realize.
4. a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation according to claim 1, it is characterized in that, the chip that real time signal processing unit (5) adopts is DSP digital signal processing chip or FPGA field programmable gate array chip.
5. adopt a kind of ultrasound echo signal real-time processing device based on linear FM signal excitation according to claim 1 to realize real time signal processing method, it is characterized in that, described method comprises:
Real time signal processing unit (5) carries out conjugated signal process to the digital stimulus signal received, and obtains the step of the conjugated signal of digital stimulus signal;
Real time signal processing unit (5) overturns along about Z-axis the conjugated signal of the digital stimulus signal received, and obtains the step of the conjugated signal of the digital stimulus signal of upset,
Real time signal processing unit (5), to the conjugated signal of the digital stimulus signal of the upset received and digital ultrasound echoed signal, does the step of Fourier transform,
Real time signal processing unit (5) carries out to the Fourier transform data received that data are point-to-point to be multiplied, and obtains the step of the data that are multiplied,
Real time signal processing unit (5) carries out the step of inverse Fourier transform to the data that are multiplied received,
Real time signal processing unit (5) carries out Hilbert transform to the inverse Fourier transform data received, and obtains the step of ultrasonic echo compression processing signals.
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