CN104833721B - For echo gain method for independently controlling in the gate of supersonic detector - Google Patents
For echo gain method for independently controlling in the gate of supersonic detector Download PDFInfo
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- CN104833721B CN104833721B CN201510225229.XA CN201510225229A CN104833721B CN 104833721 B CN104833721 B CN 104833721B CN 201510225229 A CN201510225229 A CN 201510225229A CN 104833721 B CN104833721 B CN 104833721B
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Abstract
Echo gain method for independently controlling, belongs to ultrasonic examination technical field in a kind of gate for supersonic detector.This method is worked by following module cooperative and realized：Gain control module, binary channels amplification module, double channel A/D acquisition modules, digital signal processing module.Using binary channels amplification module, the independent control of different echo-signal gains is realized；Using double channel A/D acquisition modules, the synchronous acquisition of the echo-signal under different gains is realized；Using digital signal processing module, the real-time splicing of the echo-signal under two different gains is realized so that can observe the echo-signal under different gains simultaneously in waveform display screen.
Description
Technical field
The invention belongs to ultrasonic examination technical field, in particular, provide in a kind of gate for supersonic detector
Echo gain method for independently controlling, it is adaptable to the ultrasonic examination of casting or forging.
Background technology
During the ultrasonic examination of casting or forging, generally require while monitoring bottom ripple and defect waves.Defect waves are believed
It is number weaker, and bottom ripple signal is stronger.Under normal circumstances, in order to ensure that internal flaw occurs without missing inspection or flase drop, it is necessary to by instrument
Gain-adjusted to higher level；Now, the peak of bottom ripple signal often exceeds the indication range of screen, and waveform is shown as
Flat-top phenomenon.Now, if workpiece bottom has big loose, it is possible that missing inspection.And existing most of supersonic detectors
Single yield value can only often be set, it is impossible to meet the demand for observing bottom ripple and defect waves simultaneously.
In view of the above-mentioned problems, proposing a kind of method that can be directed to echo gain independent control in gate, i.e.,：Use gate frame
The echo-signal of independent control gain is firmly needed, for normal echo and needing the echo of independent control to set different increasings respectively
Benefit value.
The content of the invention
It is an object of the invention to provide echo gain method for independently controlling in a kind of gate for supersonic detector, use
During solving flaw detection, it is necessary to the problem of individually echo-signal gain in regulating gate.
Based on above-mentioned purpose, method proposed by the present invention is worked by following module cooperative and realized：Gain control module 101,
Binary channels amplification module 102, double channel A/D acquisition modules 103, digital signal processing module 104.
Detection signal is divided to two-way while entering two passages of binary channels amplification module 102, and input is believed by the module
Number it is amplified.The regulation of each channel gain is set by gain control module 101.The output of gain control module is put with binary channels
The control port of big module is connected.The output of binary channels amplification module and the analog input end of double channel A/D acquisition modules 103 are straight
Connect connected, signal is converted to two ways of digital signals by double channel A/D acquisition modules.The output of double channel A/D acquisition modules with
The input pin of digital signal processing module 104 is joined directly together.Digital signal processing module is extracted wherein all the way in signal, selectes gate region
Interior signal, and spliced in real time with another railway digital signal, realize the independent control of echo gain in gate.
The gain control module 101 that the present invention is designed, including gain setting unit and binary channels D/A compositions.Gain is set
Put the normal echo of setting of unit and need the echo gain of independent control.This two ways of digital signals and binary channels D/A input
End is connected, and is changed by D/A, is converted to different analog signals.
The binary channels amplification module 102 that the present invention is designed, is made up of two-way variable gain amplifier.It is right respectively for realizing
The amplification of normal echo-signal and the echo-signal for needing independent control.The multiplication factor of variable gain amplifier is by gain control
The output of module 101 is set, and point two-way carries out the amplification of different multiples to input signal simultaneously.
The double channel A that the present invention is designed/D acquisition modules 103, is made up of two-way AD conversion device, for changing in real time simultaneously
Gather two paths of signals.Output of the input of this module from above-mentioned binary channels amplification module.Double channel A/D is realized to be increased to two-way
The synchronous conversion and collection of beneficial unlike signal, and most this two paths of data delivers to digital signal processing module at last.
The digital signal processing module 104 that the present invention is designed, this module design is completed using FPGA, and it is inputted as collection mould
The output signal of block 104.The signal all the way collected is extracted as the main body of display, will need to increase using different in this road signal
The part that benefit is detected, is replaced with the same region of another road signal.And real-time synchronization signal is utilized, this two parts is entered
Row is seamless spliced.
The core of the present invention is, by the way that signal point two-way is entered into binary channels amplification module 102, and to carry out gain respectively
Regulation；Again by double channel A/D acquisition modules 103, the echo-signal to two different gains is gathered in real time；Finally use number
Word signal processing module 104 carries out real time data splicing.
The invention has the advantages that：
By means of above-mentioned technical proposal, the present invention is not being influenceed using binary channels amplification and the real-time acquisition technique of binary channels
On the premise of other performances of instrument, the independent control function of echo gain in gate is realized, is particularly suitable for use in casting or forging
, it is necessary to monitor the situation of bottom ripple and defect waves simultaneously during the ultrasonic examination of part.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, embodiment will be described below used in accompanying drawing make letter
Single introduction.
Fig. 1 is the structural representation of method proposed by the present invention.
When Fig. 2 is that defectoscope signal gain is set to A (yield value is smaller), when being tested defective in test block, defectoscope A
Sweep wavy curve.
When Fig. 3 is that defectoscope signal gain is set to B (yield value is larger), when being tested defective in test block, defectoscope A
Sweep wavy curve.
Fig. 4 is that digital signal processing module sweeps wavy curve to Fig. 2 and Fig. 3 spliced A of Wave data progress.
Embodiment
In view of existing most of supersonic detectors can only often set single yield value, it is impossible to meet and observe bottom simultaneously
The demand of ripple and defect waves, the present invention provides echo gain method for independently controlling in a kind of high performance gate, below in conjunction with attached
The present invention is described in detail for figure.
The structure of echo gain method for independently controlling in the gate that the present embodiment is provided, as shown in figure 1, including gain
Control module 101, binary channels amplification module 102, double channel A/D acquisition modules 103, digital signal processing module 104.
Gain control module 101, the gain for controlling amplification modules at different levels.
Binary channels amplification module 102, amplifies to echo-signal in normal echo-signal and gate respectively for realizing.
Double channel A/D acquisition modules 103, for gathering echo-signal in normal echo-signal and gate in real time.
Digital signal processing module 104, for realizing that data are spliced, waveform is shown and other control functions.
The concrete operating principle of the present embodiment is as follows：
Gate is framed to the echo for needing individual gain to adjust at instrumentation interface, and normal echo gain is set respectively
Echo gain B in A and gate.Gain control module 101 calculates binary channels amplification module respectively according to gain A and gain B value
The yield value of each passage in 102, and send control signal and be set to the value.
Ultrasonic wave receiving transducer received ultrasonic signal is simultaneously converted into voltage signal, and signal is delivered into binary channels amplification module
102.There are two basic amplification modules, the control sent respectively according to above-mentioned gain control module 101 in binary channels amplification module
Value, is zoomed in or out respectively to signal；This module exports that two phases are consistent, the ultrasonic echo voltage letter of amplitude not etc.
Number.
Double channel A/D acquisition modules 103 are consistent to above-mentioned two phase, the ultrasonic echo voltage signal of amplitude not etc. enters
Row is synchronous, collection in real time, obtains two groups of echo voltage datas, its oscillogram difference is as shown in Figure 2 and Figure 3.
Digital signal processing module 104 directly covers the echo voltage data (sound path 330 to 390) that gate in Fig. 2 is framed
Lid falls the interval echo voltage data of same position in Fig. 3, realizes the splicing of data and includes it on the display screen of instrument,
Splicing result is as shown in Figure 4.
Claims (5)
1. echo gain method for independently controlling in a kind of gate for supersonic detector, it is characterised in that this method by with
Lower module, which cooperates, to be realized：Gain control module (101), binary channels amplification module (102), double channel A/D acquisition modules
(103), digital signal processing module (104)；Wherein：
Detection signal is divided to two-way while entering two passages of binary channels amplification module (102), by the module to input signal
It is amplified；The regulation of each channel gain is set by gain control module (101), and output and the binary channels of gain control module are put
The control port of big module is connected；The output of binary channels amplification module and the analog input end of double channel A/D acquisition modules (103)
It is joined directly together, signal is converted to two ways of digital signals by double channel A/D acquisition modules；The output of double channel A/D acquisition modules
It is joined directly together with the input pin of digital signal processing module (104)；Digital signal processing module (104) is extracted wherein to be believed all the way
Number, the signal in gate region is selected, and is spliced in real time with another railway digital signal, the only of echo gain in gate is realized
Vertical control.
2. control method according to claim 1, it is characterised in that described gain control module (101) includes gain
Setting unit and binary channels D/A；Gain setting unit sets normal echo and needs the echo gain of independent control；This two-way
Data signal is connected with binary channels D/A input, is changed by D/A, is converted to different analog signals.
3. control method according to claim 1, it is characterised in that described binary channels amplification module (102) is by two-way
Variable gain amplifier is constituted；For realizing amplification respectively to normal echo-signal and the echo-signal for needing independent control,
The multiplication factor of variable gain amplifier is set by the output of gain control module (101), and point two-way enters to input signal simultaneously
The amplification of row different multiples.
4. control method according to claim 1, it is characterised in that described double channel A/D acquisition modules (103) are by two
Road AD conversion device composition, for changing in real time and gathering two paths of signals；The input of this module amplifies mould from above-mentioned binary channels
The output of block, double channel A/D realizes the synchronous conversion to two-way gain unlike signal and gathered, and most this two paths of data at last
Deliver to digital signal processing module.
5. control method according to claim 1, it is characterised in that described digital signal processing module (104) is used
FPGA is completed, and it inputs the output signal for double channel A/D acquisition modules (103)；The signal all the way collected is extracted as aobvious
The main body shown, will be needed the part detected using different gains, is carried out with the same region of another road signal in this road signal
Replace；And real-time synchronization signal is utilized, this two parts is carried out seamless spliced.
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| US5392257A (en) * | 1993-08-23 | 1995-02-21 | Westinghouse Electric Corp. | Sonar receiver with improved time varied gain correction |
| US5959294A (en) * | 1998-02-10 | 1999-09-28 | Litton Systems, Inc. | Method and apparatus for interrogation of fiber optic interferometric sensors in multi-channel applications |
| CN102508290B (en) * | 2011-10-08 | 2013-06-19 | 天津大学 | Multichannel seismic signal acquisition device with high synchronization accuracy |
| CN102743190B (en) * | 2012-08-01 | 2014-11-12 | 深圳市理邦精密仪器股份有限公司 | Method and system for improving noise ratio of transcranial doppler signals |
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Address after: No. 13, sorghum Bridge, Beijing, Beijing, Haidian District Patentee after: The detection technology of NCS Limited by Share Ltd Address before: No. 13, sorghum Bridge, Beijing, Beijing, Haidian District Patentee before: NCS Testing Technology Co., Ltd. |
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