CN104935276B - Linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal - Google Patents
Linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal Download PDFInfo
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- CN104935276B CN104935276B CN201510402052.6A CN201510402052A CN104935276B CN 104935276 B CN104935276 B CN 104935276B CN 201510402052 A CN201510402052 A CN 201510402052A CN 104935276 B CN104935276 B CN 104935276B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/20—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F2203/21—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F2203/211—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
- H03F2203/21142—Output signals of a plurality of power amplifiers are parallel combined to a common output
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Abstract
The embodiment of the present invention provides a kind of linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal, and the device includes：Multiple drive power module improves the power output of signal step by step, produces the random waveform signal after multiple-channel output power improves；The output end of each Linear Amplifer module is in parallel in multiple Linear Amplifer modules, the input of each Linear Amplifer module receives the signal all the way in the random waveform signal after multiple-channel output power improves in multiple Linear Amplifer modules, the signal all the way in random waveform signal after the raising of multiple-channel output power is at least inputted to one in multiple Linear Amplifer modules, each Linear Amplifer module carries out Linear Amplifer to the random waveform signal of input, random waveform signal after the amplification of output end output linearity, random waveform signal after the Linear Amplifer of multiple Linear Amplifer module outputs carries out power combing to generate pumping signal.The program provides the high-power random waveform pumping signal that can drive electromagnetic ultrasonic guide wave transducer.
Description
Technical field
It is more particularly to a kind of to be used for what electromagnetic ultrasonic guide wave pumping signal generated the present invention relates to technical field of nondestructive testing
Linear power amplifying device.
Background technology
Needed relative to traditional ultrasound detection to the structure entirely point-by-point scanning of region progress to be checked, supersonic guide-wave, which has, to be passed
The characteristics of distance is remote, decay is small is broadcast, can excite and be realized to structure to be checked long range, large-scale complete detection in single-point.But
Due to the Dispersion of supersonic guide-wave, narrower according to the time domain used in conventional Ultrasound detection and frequency broadband pulse signal
During as excitation, the defects of time-history curves ripple bag broadening can be caused, the extraction of defect characteristic information is not easy to, results even in
Aliasing occurs for different flaw echo bags so that defect information is difficult to differentiate.Therefore, for driving swashing for ultrasonic guided wave transducer
Encouraging signal needs using the narrower signal of time domain and frequency band, as added the window functions such as rectangular window, Hanning window or hamming window to modulate
Multicycle sine wave.In this case, the excitation module in ultrasonic guided wave detection device can not use traditional pulse to believe
Number way of output, it would be desirable to be able to realize the output of random waveform signal.
Relative to traditional piezoelectric supersonic guided wave detection technology, electromagnetic ultrasonic guide wave detection technique has contactless, no
The advantages that needing couplant, grinding process need not be carried out to detection object surface and high temperature object can be detected, and electricity
Magnetic ultrasonic guided wave detecting result is reproducible.These advantages cause electromagnetic ultrasonic guide wave detection technique to determine more suitable for supersonic guide-wave
Measure the occasion assessed.For exciting bank, PZT (piezoelectric transducer) belongs to capacitive load, it is only necessary to the output that exciting bank provides
Signal has larger amplitude, and electromagnet ultrasonic changer belongs to inductive load, it is necessary to exciting bank can launch it is high-power
Drive signal.
In summary, the exciting bank for electromagnetic ultrasonic guide wave detection needs that high-power random waveform excitation letter can be exported
Number, this requires that exciting bank can not only carry out Linear Amplifer to the small-power random waveform signal for being sent into its input port, and puts
Random waveform pumping signal after big should have enough power outputs, to drive electromagnetic ultrasonic guide wave transducer to be checked
Supersonic guide-wave is produced in structure.
But the existing supersonic detection device that can export random waveform pumping signal designs for PZT (piezoelectric transducer).
For example, excitation piezoelectric transducer array of the prior art produces the random waveform excitation board of supersonic guide-wave, the random waveform
Board is encouraged by usb circuit, the SRAM (static RAM) for stored waveform data point, Waveform composition electricity
Road, control usb circuit, SRAM, the reception of waveform synthetic circuit progress waveform data points, storage and the FPGA (scenes of synthesis
Programmable gate array) and several parts compositions such as waveform power amplifier, the excitation board is exportable to be used to drive PZT (piezoelectric transducer)
High pressure random waveform signal, but the power of its output signal is smaller, is not suitable for excitation electromagnet ultrasonic changer.At present, can drive
The exciting bank of dynamic electromagnet ultrasonic changer is difficult to produce powerful random waveform.It is for example, also of the prior art " a kind of
The supply unit of electromagnetic acoustic ", the supply unit is by signal generator, power amplifier device, impedance matching box, EMAT (electromagnetism
Ultrasonic transducer) transmitting and EMAT receiving transducers composition, the device use the mode of resonance to provide oneself for EMAT transmitting probes
Starting point to maximum amplitude, with the exciting current of the formal distribution of arithmetic progression.But the device can not provide for EMAT transmitting probes
Random waveform pumping signal.
Therefore, it is existing that the exciting bank of electromagnet ultrasonic changer can be driven to be difficult to produce powerful random waveform excitation
Signal.
The content of the invention
The embodiments of the invention provide it is a kind of for electromagnetic ultrasonic guide wave pumping signal generation linear power amplifying device,
To provide the high-power random waveform pumping signal for meeting that electromagnetic ultrasonic guide wave transducer requirement can be driven.The exciting bank bag
Include：Multiple drive power module and multiple Linear Amplifer modules, wherein, the input of first order drive module in multiple drive power module
The signal of the random waveform shape of input signal source output, the multistage drive module are used to improve random waveform signal step by step
Power output, and produce the random waveform signal after multiple-channel output power improves；Each Linear Amplifer in multiple Linear Amplifer modules
The output end of module is in parallel, and the input of each Linear Amplifer module receives the multiple-channel output work(in multiple Linear Amplifer modules
The signal all the way in random waveform signal after rate raising, the letter all the way in random waveform signal after the raising of multiple-channel output power
Number at least input to a Linear Amplifer module in multiple Linear Amplifer modules, each Linear Amplifer module and be used for input
Random waveform signal carries out Linear Amplifer, and the signal of the random waveform shape after the amplification of output end output linearity, multiple lines
Property amplification module output Linear Amplifer after the signal of random waveform shape carry out power combing to generate pumping signal.
In one embodiment, the first order drive module in the multistage drive module includes one for improving signal
First linear amplifier circuit of power output, other grade of drive module in the multistage drive module include multiple being used to improve
Second linear amplifier circuit of output power signal, any ripple of the input input signal source output of the first linear amplifier circuit
The signal of shape shape, the output end of the first linear amplifier circuit connect each second Linear Amplifer electricity in next stage drive module
The input on road.
In one embodiment, the multistage drive module includes first order drive module and second level drive module, institute
Stating first order drive module includes first linear amplifier circuit, and the second level drive module is linearly put including three second
Big circuit, the input of three second linear amplifier circuits are all connected with the output end of first linear amplifier circuit, and this three
The output end of individual second linear amplifier circuit exports the random waveform signal after power output raising all the way respectively.
In one embodiment, first linear amplifier circuit, including：First N-channel insulating gate type field effect tube,
One power supply, first resistor, second resistance, the first inductance, 3rd resistor, the 4th resistance, the first electric capacity and the 5th resistance, its
In, the output end of first power supply connects the first end of the first resistor, described in the second end connection of the first resistor
The first end of second resistance, the second end connection ground level of the second resistance；Described in the output end connection of first power supply
The first end of first inductance, the second end of first inductance connect the first end of the 3rd resistor, the 3rd resistor
Second end connects the drain electrode of the first N-channel insulating gate type field effect tube；The first N-channel insulating gate type field effect tube
Source electrode connects the first end of the 4th resistance, and the second end of the 4th resistance connects the ground level, first N-channel
The source electrode of insulating gate type field effect tube is the output end of first linear amplifier circuit；The first N-channel insulated-gate type field
The grid of effect pipe connects the first of the second end of the 5th resistance, the second end of the first resistor and the second resistance
Hold, the second end of first end connection first electric capacity of the 5th resistance, described in the first end connection of first electric capacity
The output end of module occurs for random waveform.
In one embodiment, second linear amplifier circuit, including：Second N-channel insulating gate type field effect tube,
Two power supplys, the 6th resistance, the second inductance, the 7th resistance and the 8th resistance, wherein, the second N-channel insulated-gate type field effect
Should the grid of pipe connect the second end of the 6th resistance, the first end of the 6th resistance is second linear amplifier circuit
Input；The output end of the second source connects the first end of second inductance, and the second end of second inductance connects
The first end of the 7th resistance is connect, the second end of the 7th resistance connects the second N-channel insulating gate type field effect tube
Drain electrode；The source electrode of the second N-channel insulating gate type field effect tube connects the first end of the 8th resistance, the 8th electricity
The second end connection ground level of resistance, the source electrode of the second N-channel insulating gate type field effect tube is second Linear Amplifer electricity
The output end on road.
In one embodiment, the Linear Amplifer module, including：3rd N-channel insulating gate type field effect tube, the 3rd electricity
Source, the 9th resistance, the 3rd inductance, the tenth resistance, the 11st resistance, wherein, the 3rd N-channel insulating gate type field effect tube
Grid connects the second end of the 9th resistance, and the first end of the 9th resistance is the input of the Linear Amplifer module；
The drain electrode of the 3rd N-channel insulating gate type field effect tube connects the first end of the tenth resistance, and the of the tenth resistance
Two ends connect the first end of the 3rd inductance, and the second end of the 3rd inductance connects the 3rd power supply, the 3rd N ditches
The drain electrode of road insulating gate type field effect tube is the output end of the Linear Amplifer module；The 3rd N-channel insulated-gate type field effect
Should the source electrode of pipe connect the first end of the 11st resistance, the second end connection ground level of the 11st resistance.
In one embodiment, in addition to：Electric capacity, the output of first end multiple Linear Amplifer modules in parallel of the electric capacity
End, the input of the second end connection electromagnetic ultrasonic guide wave transducer of the electric capacity.
In embodiments of the present invention, the random waveform signal that multiple drive power module improves signal source output step by step is passed sequentially through
Power, to strengthen the random waveform signal after power output improves to the driving force of Linear Amplifer module, can be achieved all the way
Random waveform signal after power output raising while multiple Linear Amplifer modules to driving；By by multiple Linear Amplifer moulds
Random waveform signal after the Linear Amplifer of block output carries out power combing to generate pumping signal, can improve the defeated of pumping signal
Go out power, strengthen the driving force to electromagnetic ultrasonic guide wave transducer so that the pumping signal is that satisfaction can drive electromagnetic acoustic
The high-power pumping signal of wave guide energy converter requirement, and the waveform of the high-power pumping signal can be arbitrary, you can root
According to different detection demands, the signal of different wave shape is selected to carry out power amplification, to excite electromagnetic ultrasonic guide wave transducer
Required supersonic guide-wave is produced in result to be checked.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, not
Form limitation of the invention.In the accompanying drawings：
Fig. 1 is a kind of linear prower amplifier for the generation of electromagnetic ultrasonic guide wave pumping signal provided in an embodiment of the present invention
The structure chart of device；
Fig. 2 is a kind of linear prower amplifier for the generation of electromagnetic ultrasonic guide wave pumping signal provided in an embodiment of the present invention
The physical circuit figure of device；
Fig. 3 is a kind of linear prower amplifier for the generation of electromagnetic ultrasonic guide wave pumping signal provided in an embodiment of the present invention
The test device schematic diagram of device；
Fig. 4 is the comparison diagram of a kind of pumping signal provided in an embodiment of the present invention and standard input signal；
Fig. 5 is a kind of linear prower amplifier for the generation of electromagnetic ultrasonic guide wave pumping signal provided in an embodiment of the present invention
The application system schematic diagram of device；
Fig. 6 is a kind of timeamplitude map of detection waveform signal provided in an embodiment of the present invention.
Embodiment
It is right with reference to embodiment and accompanying drawing for the object, technical solutions and advantages of the present invention are more clearly understood
The present invention is described in further details.Here, the exemplary embodiment of the present invention and its illustrate to be used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
In embodiments of the present invention, there is provided a kind of linear prower amplifier for the generation of electromagnetic ultrasonic guide wave pumping signal
Device, as shown in figure 1, the device includes：Multiple drive power module (in Fig. 1, so that multiple drive power module is two-stage as an example, that is, is wrapped
First order drive module 1021 and second level drive module 1022 are included, specifically, the series of drive module can be according to specific need
Ask adjustment) and multiple Linear Amplifer modules 103, wherein,
The input input signal source 101 of first order drive module is (for example, the signal source 101 is in multiple drive power module
Module occurs for random waveform) signal of the random waveform shape of output, the multistage drive module is used to improve any ripple step by step
The power output of shape signal, and produce the random waveform signal after multiple-channel output power improves；
The output end of each Linear Amplifer module is in parallel in multiple Linear Amplifer modules 103, every in multiple Linear Amplifer modules
The input of individual Linear Amplifer module receives the signal all the way in the random waveform signal after the multiple-channel output power improves, more
The signal all the way in random waveform signal after the power output raising of road is at least inputted to one in multiple Linear Amplifer modules
Linear Amplifer module, each Linear Amplifer module are used to carry out Linear Amplifer to the random waveform signal of input, and in output end
Random waveform signal after output linearity amplification, the random waveform signal after the Linear Amplifer of multiple Linear Amplifer modules output enter
Row power combing is to generate pumping signal.
Understand as shown in Figure 1, in embodiments of the present invention, pass sequentially through multiple drive power module and improve random waveform hair step by step
The power output of the random waveform signal of raw module output, the random waveform signal after enhancing power output raising is to Linear Amplifer
The driving force of module, while the random waveform signal after power output improves all the way can be achieved to multiple Linear Amplifer modules
Driving；It is sharp to generate that power combing is carried out by the random waveform signal after the Linear Amplifer that exports multiple Linear Amplifer modules
Signal is encouraged, improves the power output of pumping signal, strengthens the driving force to electromagnetic ultrasonic guide wave transducer so that the excitation is believed
Number to meet the high-power pumping signal of driving electromagnetic ultrasonic guide wave transducer requirement, and the waveform of the high-power pumping signal
Can be arbitrary, you can according to different detection demands, select the signal of different wave shape to carry out power amplification, to excite
Electromagnetic ultrasonic guide wave transducer produces required supersonic guide-wave in structure to be checked.
When it is implemented, as shown in figure 1, the first order drive module 1021 in the above-mentioned multistage drive module includes one
Individual to be used to improving the first linear amplifier circuit of random waveform output power signal, other levels in the multistage drive module are driven
Dynamic model block 1022 includes multiple the second linear amplifier circuits for being used to improve random waveform output power signal specifically, the second line
Property amplifying circuit number can be adjusted according to real needs, the output of the input input signal source of the first linear amplifier circuit
The signal of random waveform shape, each second that the output end of the first linear amplifier circuit is connected in next stage drive module are linear
The input of amplifying circuit.When it is implemented, as shown in figure 1, the multistage drive module includes first order drive module 1021
With second level drive module 1022, first order drive module 1021 includes first linear amplifier circuit, and the second level is driven
Dynamic model block 1022 includes three the second linear amplifier circuits, and the input of three second linear amplifier circuits is all connected with described
The output end of one linear amplifier circuit, the output end of three second linear amplifier circuits export power output raising all the way respectively
Random waveform signal afterwards.So that realization passes sequentially through first order drive module 1021, second level drive module 1022 improves step by step
The power output of signal, while produce the random waveform signal after multiple-channel output power improves.
When it is implemented, in the present embodiment, as shown in Fig. 2 the first linear amplifier circuit is by N in first order drive module
Raceway groove insulating gate type field effect tube and its peripheral component are formed, specifically, first linear amplifier circuit, including：First N
Raceway groove insulating gate type field effect tube, the first power supply, first resistor, second resistance, the first inductance, 3rd resistor, the 4th resistance,
One electric capacity and the 5th resistance, wherein, the first N-channel insulating gate type field effect tube, N-channel insulated-gate type field as shown in Figure 2
Effect pipe M1；First power supply, power supply VCC1 as shown in Figure 2；The output end of first power supply connects the first resistor
First end, the second end of the first resistor connect the first end of the second resistance, the second end connection of the second resistance
Ground level, in fig. 2, first resistor are resistance R40, and second resistance is resistance R41, by the way that resistance R40 and resistance R41 is connected
Between power supply VCC1 and ground level, the voltage after partial pressure provides gate bias voltage for N-channel insulating gate type field effect tube M1；
The output end of first power supply connects the first end of first inductance, the second end connection the described 3rd of first inductance
The first end of resistance, the second end of the 3rd resistor connect the drain electrode of the first N-channel insulating gate type field effect tube, schemed
In 2, first inductance is inductance L1, and 3rd resistor is resistance R2, and voltage source VCC1 output voltage is through inductance L1 and resistance R2
The drain electrode in N-channel insulating gate type field effect tube M1 is followed by, inductance L1 is used to clamp down on power jitter, and resistance R2 is used to set static state
Operating point；The source electrode of the first N-channel insulating gate type field effect tube connects the first end of the 4th resistance, the 4th electricity
Second end of resistance connects the ground level, and the source electrode of the first N-channel insulating gate type field effect tube is linearly put for described first
The output end of big circuit, in fig. 2, i.e. the 4th resistance are resistance R3, i.e. the source electrode of N-channel insulating gate type field effect tube M1 passes through
Resistance R3 is grounded, and the DC voltage that resistance R3 is got provides gate bias voltage for next stage drive module；The first N ditches
The grid of road insulating gate type field effect tube connects the second end of the 5th resistance, the second end of the first resistor and described
The first end of second resistance, the first end of the 5th resistance connect the second end of first electric capacity, first electric capacity
First end connects the output end that module occurs for the random waveform, and in fig. 2, i.e. first electric capacity is electric capacity C5, the 5th resistance
For resistance R1, one of the random waveform signal of module output through the straight isolation resistance R1 of C5 AC coupled best friends occurs for random waveform
End, R1 another termination N-channel insulating gate type field effect tube M1 grid, this coupling and isolation method can be achieved will be any
The random waveform signal of waveform generating module output transmits to N-channel insulating gate type field effect tube M1 grid without distortion, again
The influence that DC voltage random waveform occurs module can be eliminated.
Based on the composition of above-mentioned first linear amplifier circuit as shown in Figure 2, exchanged in first linear amplifier circuit
The Linear Amplifer process of random waveform signal is as follows：The random waveform signal of module output occurs for random waveform through C5 AC coupleds
The straight isolation resistance R1 of best friend one end, R1 another termination N-channel insulating gate type field effect tube M1 grid, entrance effect pipe M1
The random waveform signal of grid is imitated after the Linear Amplifer of the first linear amplifier circuit through resistance R3 and N-channel insulated-gate type field
Should pipe M1 tie point output random waveform signal for next stage drive module provide have random waveform shape exchange it is defeated
Enter signal.In addition, as shown in Fig. 2 electric capacity C1, C6 are connected between voltage source VCC1 and ground level so that friendship can be filtered out
Flow interference of the random waveform signal to voltage source VCC1.First linear amplifier circuit can not only provide for next stage drive module
DC offset voltage, it is defeated that the enough exchanges with random waveform shape of driving force can also be provided for next stage drive module
Enter signal.
When it is implemented, in the present embodiment, as shown in Fig. 2 the second linear amplifier circuit is by N in other grade of drive module
Raceway groove insulating gate type field effect tube and its peripheral component are formed, specifically, including three second with other grade of drive module
Exemplified by linear amplifier circuit, second linear amplifier circuit, including：Second N-channel insulating gate type field effect tube, the second electricity
Source, the 6th resistance, the second inductance, the 7th resistance and the 8th resistance, wherein, the second N-channel insulating gate type field effect tube, such as scheme
Shown in 2, the second N-channel insulating gate type field effect tube is respectively N-channel insulated-gate type in three the second linear amplifier circuits
FET is M2, M3, M4；Second source, as shown in Fig. 2 three the second linear amplifier circuits can share a power supply, i.e.,
Voltage source VCC2；The grid of the second N-channel insulating gate type field effect tube connects the second end of the 6th resistance, and described the
The first end of six resistance is the input of second linear amplifier circuit, as shown in Fig. 2 the 6th resistance is in three the second lines
Property amplifying circuit in be respectively resistance R4, R16, R28, i.e. the first linear amplifier circuit output direct current biasing through three resistance
R4, R16, R28 are respectively connected to field-effect M2, M3, M4 grid, are carried for three N-channel insulating gate type field effect tubes M2, M3, M4
For identical bias voltage, it is respectively that three the second linear amplifier circuits provide direct current biasing electricity to realize the first linear amplifier circuit
Pressure, meanwhile, three resistance R4, R16, R28 can eliminate the crosstalk signal between each second linear amplifier circuit, improve whole circuit
Stability；The output end of the second source connects the first end of second inductance, and the second end of second inductance connects
The first end of the 7th resistance is connect, the second end of the 7th resistance connects the second N-channel insulating gate type field effect tube
Drain electrode, as shown in Fig. 2 three the second linear amplifier circuits share the second inductance, second inductance is inductance L2, the 7th resistance
Respectively R5, R17, R29, the i.e. voltage of voltage source VCC2 outputs are connected to ground by electric capacity C2 in three the second linear amplifier circuits
Plane is filtered, and resistance R5, R17, R29 first end, resistance R5, R17, R29 the second end point are respectively connected to through inductance L2
Drain electrode not with N-channel insulating gate type field effect tube M2, M3, M4 is connected, and inductance L2 is used to clamp down on power jitter, resistance R5,
R17, R29 are respectively used to set the quiescent point of three linear amplifier circuits；The second N-channel insulating gate type field effect tube
Source electrode connect the first end of the 8th resistance, the second end connection ground level of the 8th resistance, second N-channel is exhausted
The source electrode of edge grid-type FET is the output end of second linear amplifier circuit, as shown in Fig. 2 the 8th resistance is at three
It is respectively R6, R18, R30, i.e. N-channel insulating gate type field effect tube M2, M3, M4 source electrode difference in second linear amplifier circuit
It is grounded through resistance R6, R18, R30, the DC voltage of N-channel insulating gate type field effect tube M2, M3, M4 source electrode output can be respectively
The second linear amplifier circuit in next stage drive module provides gate bias voltage.
It is any in second linear amplifier circuit based on the composition of above-mentioned second linear amplifier circuit as shown in Figure 2
The Linear Amplifer process of waveform signal is as follows：The power output that the first linear amplifier circuit exports in first order drive module improves
Afterwards, have random waveform shape AC signal enter N-channel insulated-gate type field by three resistance R4, R16, R28 respectively
Effect pipe M2, M3, M4 grid, the AC signal with random waveform shape after three the second linear amplifier circuits amplify
Driving force is enough, may be respectively used in multiple Linear Amplifer modules of driving rear stage circuit.
When it is implemented, the number of multiple Linear Amplifer modules can adjust according to real needs, in the present embodiment, with
The number of multiple Linear Amplifer modules is exemplified by nine, when it is implemented, with the multiple signals that are exported through multiple drive power module
The number for driving linear amplification module per road signal can adjust according to real needs, as shown in Fig. 2 driving three with every road signal
Exemplified by individual Linear Amplifer module, specifically, shown Linear Amplifer module 103, including：3rd N-channel insulating gate type field effect tube,
3rd power supply, the 9th resistance, the 3rd inductance, the tenth resistance, the 11st resistance, wherein, the 3rd N-channel insulated-gate type field effect
Pipe, as shown in Fig. 2 the 3rd N-channel insulating gate type field effect tube is N-channel insulated gate respectively in nine Linear Amplifer modules
Type FET M5~M13；3rd power supply, as shown in Fig. 2 nine Linear Amplifer modules share a power supply, the 3rd power supply is
Power supply VCC3；Second end of grid connection the 9th resistance of the 3rd N-channel insulating gate type field effect tube, the described 9th
The first end of resistance is the input of the Linear Amplifer module, and in fig. 2, the 9th resistance is in nine Linear Amplifer modules
It is resistance R7, R8, R9, R19, R20, R21, R31, R32, R33 respectively, realizes N-channel insulating gate type field effect tube M2 source electrode
The DC voltage of output is inputted to N-channel insulating gate type field effect tube M5, M6, M7 grid, N ditches through resistance R7, R8, R9 respectively
The DC voltage of road insulating gate type field effect tube M3 source electrode output is inputted to N-channel through resistance R19, R20, R21 respectively to insulate
Grid-type FET M8, M9, M10 grid, the DC voltage of N-channel insulating gate type field effect tube M4 source electrode output pass through respectively
Resistance R31, R32, R33 are inputted to N-channel insulating gate type field effect tube M11, M12, M13 grid, at the same resistance R7, R8, R9,
The crosstalk that R19, R20, R21, R31, R32, R33 can isolate between each Linear Amplifer module；The 3rd N-channel insulated-gate type field
The drain electrode of effect pipe connects the first end of the tenth resistance, and the second end of the tenth resistance connects the of the 3rd inductance
One end, the second end of the 3rd inductance connect the 3rd power supply, the drain electrode of the 3rd N-channel insulating gate type field effect tube
For the output end of the Linear Amplifer module, in fig. 2, nine Linear Amplifer modules share the 3rd inductance, and the 3rd inductance is
For inductance L3, the tenth resistance be respectively in nine Linear Amplifer modules resistance R10, R12, R14, R22, R24, R26, R34,
R36, R38, realize voltage source VCC3 and are connected to ground level through electric capacity C3 and be filtered, access inductance L3 one end, inductance L3's
The other end is concatenated to N-channel insulated-gate type field effect through resistance R10, R12, R14, R22, R24, R26, R34, R36, R38 respectively
Pipe M5~M13 drain electrode, the drain electrode for N-channel insulating gate type field effect tube M5~M13 provide DC voltage；The 3rd N ditches
The source electrode of road insulating gate type field effect tube connects the first end of the 11st resistance, the second end connection of the 11st resistance
Ground level, in fig. 2, the 11st resistance be respectively in nine Linear Amplifer modules resistance R11, R13, R15, R23, R25,
R27, R35, R37, R39, i.e. N-channel insulating gate type field effect tube M5~M13 source electrode respectively through resistance R11, R13, R15,
R23, R25, R27, R35, R37, R39 are grounded.
Based on the composition of above-mentioned Linear Amplifer module 103 as shown in Figure 2, the AC signal in linear amplification module 103
Linear Amplifer process it is as follows：The N-channel insulating gate type field effect tube M2 of second linear amplifier circuit in 2nd grade of drive module
The AC signal with random waveform shape of source electrode output accesses field-effect M5, M6, M7 grid through resistance R7, R8, R9 respectively
Pole, the N-channel insulating gate type field effect tube M3 of the second linear amplifier circuit having for source electrode output is appointed in the 2nd grade of drive module
The AC signal of meaning waveform shape accesses field-effect M8, M9, M10 grid, the 2nd grade of driving through resistance R19, R20, R21 respectively
The AC signal with random waveform shape of the effect pipe M4 of the second linear amplifier circuit source electrode output passes through respectively in module
Resistance R31, R32, R33 access field-effect M11, M12, M13 grid, N-channel insulating gate type field effect tube M5~M13 are right respectively
The AC signal with random waveform shape each inputted carries out Linear Amplifer, N-channel insulating gate type field effect tube M5~M13
Drain electrode export the AC signal with random waveform shape after respective Linear Amplifer respectively.
When it is implemented, the above-mentioned linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal, in addition to：
Electric capacity, the input of one end connection electromagnetic ultrasonic guide wave transducer of the electric capacity, the other end multiple lines in parallel of the electric capacity
The output end of property amplification module.Specifically, as shown in Fig. 2 after N-channel insulating gate type field effect tube M5~M13 drain electrode parallel connection
Output signal is AC signal of the superposition with random waveform shape on direct current biasing, can be in N-channel insulating gate type field effect tube
Serial capacitance C4 (i.e. above-mentioned electric capacity) is carried out between M5~M13 drain electrode parallel outputs and electromagnetic ultrasonic guide wave transducer (EMAT)
AC coupled, this coupled modes both can influence of the DC-offset correction voltage to electromagnetic ultrasonic guide wave transducer, again can be electricity
Satisfaction after magnetic ultrasonic guided wave transducer offer Linear Amplifer can drive the high-power any of electromagnetic ultrasonic guide wave transducer requirement
Waveform signal.
In order to illustrate that the above-mentioned linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal can export arbitrarily
The satisfaction of waveform can drive the high-power pumping signal of electromagnetic ultrasonic guide wave transducer requirement, in the present embodiment, built as
Test device shown in Fig. 3.When using the test system and test, any output amplitude of waveform generating module 301 adds the Chinese for 2V
5 cycle Sine waves of peaceful window modulation, through the above-mentioned linear power amplifying device 302 for the generation of electromagnetic ultrasonic guide wave pumping signal
50 ohm of resistive loads 303 of standard are driven after amplification, oscillograph 305, the waveform gathered are accessed by 10dB attenuators 304
As shown in figure 4, solid line is the output signal that oscillograph 305 gathers in Fig. 4,5 cycle criterions that dotted line is plus Hanning window is modulated are just
String ripple input signal.As can be seen from Figure 4, the peak-to-peak value power of 305 output waveforms of oscillograph is 800W, and with adding Hanning window to adjust
5 cycle criterion sinusoidal input signals of system compare wave distortion very little, illustrate above-mentioned to be used for electromagnetic ultrasonic guide wave pumping signal
The linear power amplifying device 302 of generation can realize the high-power Linear Amplifer to random waveform signal.
To illustrate the excitation letter of the above-mentioned linear power amplifying device output for the generation of electromagnetic ultrasonic guide wave pumping signal
Number electromagnetic ultrasonic guide wave transducer can be driven to produce supersonic guide-wave in structure to be checked, in the present embodiment, built such as Fig. 5 institutes
The test system shown.When using the test system actual test, use random waveform that the output amplitude of module 501 occurs as 2V's
5 cycle Sine waves for adding Hanning window to modulate, filled through the above-mentioned linear prower amplifier for the generation of electromagnetic ultrasonic guide wave pumping signal
Driving transmitting electromagnetic ultrasonic guide wave transducer 503 produces supersonic guide-wave, another reception in iron plate 504 to be checked after putting 502 amplifications
Electromagnetic ultrasonic guide wave transducer 505 picks up produced ultrasonic guided wave signals in iron plate 504 to be measured, amplified times of the signal picked up
After number amplifies for 100dB low level signal amplification module 506, the waveform detected by oscillograph 507 is as shown in Figure 6.Can from Fig. 6
Know, the noise of institute's detection waveform is relatively good, can substantially tell direct wave and end face reflection echo, illustrates above-mentioned for electromagnetism to surpass
The linear power amplifying device of guided Waves pumping signal generation can drive electromagnet ultrasonic changer to produce supersonic guide-wave.
In embodiments of the present invention, pass sequentially through multiple drive power module and improve times that module output occurs for random waveform step by step
The power output of meaning waveform signal, strengthen driving energy of the random waveform signal after power output improves to Linear Amplifer module
Power, the random waveform signal after power output improves all the way can be achieved to being driven while multiple Linear Amplifer modules；Passing through will
Random waveform signal after the Linear Amplifer of multiple Linear Amplifer module outputs carries out power combing to generate pumping signal, improves
The power output of the pumping signal of exciting bank output, strengthens the driving force to electromagnetic ultrasonic guide wave transducer so that this swashs
Signal is encouraged to meet the high-power pumping signal that can drive electromagnetic ultrasonic guide wave transducer requirement, and the high-power pumping signal
Waveform can be arbitrary, you can according to different detection demands, select the signal of different wave shape to carry out power amplification,
To excite electromagnetic ultrasonic guide wave transducer to produce required supersonic guide-wave in structure to be checked.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
Realized with general computing device, they can be concentrated on single computing device, or are distributed in multiple computing devices
On the network formed, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and performed in the storage device by computing device, and in some cases, can be to be held different from order herein
They, are either fabricated to each integrated circuit modules or will be multiple in them by the shown or described step of row respectively
Module or step are fabricated to single integrated circuit module to realize.So, the embodiment of the present invention is not restricted to any specific hard
Part and software combine.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles of the invention, made
Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.
Claims (5)
- A kind of 1. linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal, it is characterised in that including：It is multistage Drive module and multiple Linear Amplifer modules, wherein,The signal of the random waveform shape of the input input signal source output of first order drive module, more in multiple drive power module The level drive module is used for the power output for improving signal step by step, and produces the random waveform letter after multiple-channel output power improves Number；The output end of each Linear Amplifer module is in parallel in multiple Linear Amplifer modules, is each linearly put in multiple Linear Amplifer modules The input of big module receives the signal all the way in the random waveform signal after the multiple-channel output power improves, multiple-channel output work( The signal all the way in random waveform signal after rate raising is at least inputted to a Linear Amplifer in multiple Linear Amplifer modules Module, each Linear Amplifer module are used to carry out Linear Amplifer to the random waveform signal of input, and in output end output linearity The signal of random waveform shape after amplification, the letter of the random waveform shape after the Linear Amplifer of multiple Linear Amplifer modules output Number power combing is carried out to generate pumping signal；First order drive module in the multistage drive module includes a First Line for being used to improve the power output of signal Property amplifying circuit, other grade of drive module in the multistage drive module include multiple power outputs for being used to improve signal Second linear amplifier circuit, the signal of the random waveform shape of the input input signal source output of the first linear amplifier circuit, The input of each second linear amplifier circuit in the output end connection next stage drive module of first linear amplifier circuit；First linear amplifier circuit, including：First N-channel insulating gate type field effect tube, the first power supply, first resistor, second resistance, the first inductance, 3rd resistor, Four resistance, the first electric capacity and the 5th resistance, wherein,The output end of first power supply connects the first end of the first resistor, described in the second end connection of the first resistor The first end of second resistance, the second end connection ground level of the second resistance；The output end of first power supply connects the first end of first inductance, described in the second end connection of first inductance The first end of 3rd resistor, the second end of the 3rd resistor connect the drain electrode of the first N-channel insulating gate type field effect tube；The source electrode of the first N-channel insulating gate type field effect tube connects the first end of the 4th resistance, the 4th resistance The second end connect the ground level, the source electrode of the first N-channel insulating gate type field effect tube is first Linear Amplifer The output end of circuit；The grid of the first N-channel insulating gate type field effect tube connects the second end of the 5th resistance, the first resistor The second end and the second resistance first end, the first end of the 5th resistance connects the second of first electric capacity End, the first end of first electric capacity connect the output end that module occurs for the random waveform.
- 2. device as claimed in claim 1, it is characterised in that the multistage drive module includes first order drive module and the Secondary drive module, the first order drive module include first linear amplifier circuit, the second level drive module bag Three the second linear amplifier circuits are included, the input of three second linear amplifier circuits is all connected with the first Linear Amplifer electricity The output end on road, the output end of three second linear amplifier circuits export the random waveform after power output raising all the way respectively Signal.
- 3. device as claimed in claim 1, it is characterised in that second linear amplifier circuit, including：Second N-channel insulating gate type field effect tube, second source, the 6th resistance, the second inductance, the 7th resistance and the 8th electricity Resistance, wherein,The grid of the second N-channel insulating gate type field effect tube connects the second end of the 6th resistance, the 6th resistance First end be second linear amplifier circuit input；The output end of the second source connects the first end of second inductance, described in the second end connection of second inductance The first end of 7th resistance, the second end of the 7th resistance connect the drain electrode of the second N-channel insulating gate type field effect tube；The source electrode of the second N-channel insulating gate type field effect tube connects the first end of the 8th resistance, the 8th resistance The second end connection ground level, the source electrode of the second N-channel insulating gate type field effect tube is second linear amplifier circuit Output end.
- 4. device as claimed any one in claims 1 to 3, it is characterised in that the Linear Amplifer module, including：3rd N-channel insulating gate type field effect tube, the 3rd power supply, the 9th resistance, the 3rd inductance, the tenth resistance, the 11st resistance, Wherein,The grid of the 3rd N-channel insulating gate type field effect tube connects the second end of the 9th resistance, the 9th resistance First end be the Linear Amplifer module input；The drain electrode of the 3rd N-channel insulating gate type field effect tube connects the first end of the tenth resistance, the tenth resistance The second end connect the first end of the 3rd inductance, the second end of the 3rd inductance connects the 3rd power supply, described the The drain electrode of three N-channel insulating gate type field effect tubes is the output end of the Linear Amplifer module；The first end of source electrode connection the 11st resistance of the 3rd N-channel insulating gate type field effect tube, the described 11st The second end connection ground level of resistance.
- 5. device as claimed any one in claims 1 to 3, it is characterised in that also include：Electric capacity, the output end of first end multiple Linear Amplifer modules in parallel of the electric capacity, the second end connection electricity of the electric capacity The input of magnetic ultrasonic guided wave transducer.
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