CN204697018U - For the linear power amplifying device that electromagnetic ultrasonic guide wave pumping signal generates - Google Patents
For the linear power amplifying device that electromagnetic ultrasonic guide wave pumping signal generates Download PDFInfo
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- CN204697018U CN204697018U CN201520495147.2U CN201520495147U CN204697018U CN 204697018 U CN204697018 U CN 204697018U CN 201520495147 U CN201520495147 U CN 201520495147U CN 204697018 U CN204697018 U CN 204697018U
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Abstract
The utility model embodiment provides a kind of linear power amplifying device generated for electromagnetic ultrasonic guide wave pumping signal, and this device comprises: multiple drive power module improves the power output of signal step by step, produces the random waveform signal after the raising of multiple-channel output power, in multiple Linear Amplifer module, the output of each Linear Amplifer module is in parallel, in multiple Linear Amplifer module the input of each Linear Amplifer module receive multiple-channel output power improve after random waveform signal Zhong mono-road signal, random waveform signal Zhong mono-road signal after multiple-channel output power improves at least inputs to one in multiple Linear Amplifer module, the random waveform signal of each Linear Amplifer module to input carries out Linear Amplifer, random waveform signal after output output linearity amplifies, random waveform signal after the Linear Amplifer that multiple Linear Amplifer module exports 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
The utility model relates to technical field of nondestructive testing, particularly a kind of linear power amplifying device generated for electromagnetic ultrasonic guide wave pumping signal.
Background technology
Need to carry out pointwise scanning to the whole region to be checked of structure relative to traditional ultrasound detection, supersonic guide-wave has that propagation distance is far away, decay little feature, can excite and realize the long distance of structure to be checked, on a large scale complete detection at single-point.But due to the Dispersion of supersonic guide-wave, when narrower the and pulse signal of frequency broadband of time domain used in detecting according to conventional Ultrasound is as excitation, the defect waves bag broadening on time-history curves can be made, be not easy to the extraction of defect characteristic information, even can cause different flaw echo bag generation aliasing, make defect information be difficult to differentiate.Therefore, need for driving the pumping signal of ultrasonic guided wave transducer to adopt time domain and all narrower signal of frequency band, the multicycle as added the window function modulation such as rectangular window, Hanning window or hamming window is sinusoidal wave.In this case, the stimulating module in ultrasonic guided wave detection device can not adopt traditional output of pulse signal mode, needs the output that can realize random waveform signal.
Relative to traditional piezoelectric supersonic guided wave detection technology, electromagnetic ultrasonic guide wave detection technique have contactless, do not need couplant, without the need to carrying out grinding process to detected object surface and can carrying out the advantage such as detecting to high temperature object, and electromagnetic ultrasonic guide wave testing result is reproducible.These advantages make electromagnetic ultrasonic guide wave detection technique be more suitable for the occasion of supersonic guide-wave qualitative assessment.For exciting bank, PZT (piezoelectric transducer) belongs to capacitive load, and the output signal only needing exciting bank to provide has larger amplitude, and electromagnet ultrasonic changer belongs to inductive load, needs exciting bank to launch powerful drive singal.
In sum, the exciting bank detected for electromagnetic ultrasonic guide wave needs to export high-power random waveform pumping signal, this requires that exciting bank can not only carry out Linear Amplifer to the small-power random waveform signal sending into its input port, and the random waveform pumping signal after amplifying should have enough power outputs, electromagnetic ultrasonic guide wave transducer can be driven in structure to be checked to produce supersonic guide-wave.
But the existing supersonic detection device that can export random waveform pumping signal designs for PZT (piezoelectric transducer).Such as, excitation piezoelectric transducer array of the prior art produces the random waveform excitation board of supersonic guide-wave, this random waveform excitation board is by usb circuit, for the SRAM (static RAM) of stored waveform data point, waveform synthetic circuit, control usb circuit, SRAM, waveform synthetic circuit carries out waveform data points reception, a few part composition such as the FPGA (field programmable gate array) stored and synthesize and waveform power amplifier, this excitation board is exportable for driving the high pressure random waveform signal of PZT (piezoelectric transducer), but the power of its output signal is less, be not suitable for encouraging electromagnet ultrasonic changer.At present, the exciting bank of electromagnet ultrasonic changer can be driven to be difficult to produce powerful random waveform.Such as, in addition " a kind of supply unit of electromagnetic acoustic " of the prior art, this supply unit by signal generator, power amplifier device, impedance matching box, EMAT (electromagnet ultrasonic changer) launches and EMAT receiving transducer form, the mode of this device employing resonance provides from starting point to maximum amplitude, with the exciting current of the formal distribution of arithmetic progression for EMAT transmitting probe.But this device cannot provide random waveform pumping signal for EMAT transmitting probe.
Therefore, the existing exciting bank of electromagnet ultrasonic changer that can drive is difficult to produce powerful random waveform pumping signal.
Utility model content
The utility model embodiment provides a kind of linear power amplifying device generated for electromagnetic ultrasonic guide wave pumping signal, to provide the high-power random waveform pumping signal meeting and can drive the requirement of electromagnetic ultrasonic guide wave transducer.This exciting bank comprises: multiple drive power module and multiple Linear Amplifer module, wherein, the signal of the random waveform shape that the input input signal source of first order driver module exports in multiple drive power module, multistage described driver module is used for the power output improving random waveform signal step by step, and produces the random waveform signal after the raising of multiple-channel output power, in multiple Linear Amplifer module, the output of each Linear Amplifer module is in parallel, in multiple Linear Amplifer module the input of each Linear Amplifer module receive described multiple-channel output power improve after random waveform signal Zhong mono-road signal, random waveform signal Zhong mono-road signal after multiple-channel output power improves at least inputs to a Linear Amplifer module in multiple Linear Amplifer module, each Linear Amplifer module is used for carrying out Linear Amplifer to the random waveform signal of input, and the signal of random waveform shape after output output linearity amplifies, the signal of the random waveform shape after the Linear Amplifer that multiple Linear Amplifer module exports carries out power combing to generate pumping signal.
In one embodiment, first order driver module in multistage described driver module comprises one for improving the first linear amplifier circuit of output power signal, other grade of driver module in multistage described driver module comprises multiple the second linear amplifier circuit for improving output power signal, the signal of the random waveform shape of the input input signal source output of the first linear amplifier circuit, the output of the first linear amplifier circuit connects the input of each second linear amplifier circuit in next stage driver module.
In one embodiment, multistage described driver module comprises first order driver module and second level driver module, described first order driver module comprises first linear amplifier circuit, described second level driver module comprises three the second linear amplifier circuits, the input of these three the second linear amplifier circuits all connects the output of described first linear amplifier circuit, the output of these three the second linear amplifier circuits export respectively a road power output improve after random waveform signal.
In one embodiment, described first linear amplifier circuit, comprise: a N raceway groove insulating gate type field effect tube, the first power supply, the first resistance, the second resistance, the first inductance, the 3rd resistance, the 4th resistance, the first electric capacity and the 5th resistance, wherein, the output of described first power supply connects the first end of described first resistance, second end of described first resistance connects the first end of described second resistance, and the second end of described second resistance connects ground level; The output of described first power supply connects the first end of described first inductance, and the second end of described first inductance connects the first end of described 3rd resistance, and the second end of described 3rd resistance connects the drain electrode of a described N raceway groove insulating gate type field effect tube; The source electrode of a described N raceway groove insulating gate type field effect tube connects the first end of described 4th resistance, second end of described 4th resistance connects described ground level, and the source electrode of a described N raceway groove insulating gate type field effect tube is the output of described first linear amplifier circuit; The grid of a described N raceway groove insulating gate type field effect tube connects the first end of the second end of described 5th resistance, the second end of described first resistance and described second resistance, the first end of described 5th resistance connects the second end of described first electric capacity, and the first end of described first electric capacity connects the output of described random waveform generation module.
In one embodiment, described second linear amplifier circuit, comprise: the 2nd N raceway groove insulating gate type field effect tube, second source, the 6th resistance, the second inductance, the 7th resistance and the 8th resistance, wherein, the grid of described 2nd N raceway groove insulating gate type field effect tube connects the second end of described 6th resistance, and the first end of described 6th resistance is the input of described second linear amplifier circuit; The output of described second source connects the first end of described second inductance, and the second end of described second inductance connects the first end of described 7th resistance, and the second end of described 7th resistance connects the drain electrode of described 2nd N raceway groove insulating gate type field effect tube; The source electrode of described 2nd N raceway groove insulating gate type field effect tube connects the first end of described 8th resistance, and the second end of described 8th resistance connects ground level, and the source electrode of described 2nd N raceway groove insulating gate type field effect tube is the output of described second linear amplifier circuit.
In one embodiment, described Linear Amplifer module, comprise: the 3rd N raceway groove insulating gate type field effect tube, the 3rd power supply, the 9th resistance, the 3rd inductance, the tenth resistance, the 11 resistance, wherein, the grid of described 3rd N raceway groove insulating gate type field effect tube connects the second end of described 9th resistance, and the first end of described 9th resistance is the input of described Linear Amplifer module; The drain electrode of described 3rd N raceway groove insulating gate type field effect tube connects the first end of described tenth resistance, second end of described tenth resistance connects the first end of described 3rd inductance, second end of described 3rd inductance connects described 3rd power supply, and the drain electrode of described 3rd N raceway groove insulating gate type field effect tube is the output of described Linear Amplifer module; The source electrode of described 3rd N raceway groove insulating gate type field effect tube connects the first end of described 11 resistance, and the second end of described 11 resistance connects ground level.
In one embodiment, also comprise: electric capacity, the output of first end multiple Linear Amplifer module in parallel of described electric capacity, the second end of described electric capacity connects the input of electromagnetic ultrasonic guide wave transducer.
In the utility model embodiment, the power of the random waveform signal that signal source exports is improved successively step by step by multiple drive power module, to strengthen the random waveform signal after power output raising to the driving force of Linear Amplifer module, the random waveform signal that can realize after a road power output raising drives while multiple Linear Amplifer module, by the random waveform signal after the Linear Amplifer of multiple Linear Amplifer module output is carried out power combing to generate pumping signal, the power output of pumping signal can be improved, strengthen the driving force to electromagnetic ultrasonic guide wave transducer, this pumping signal is made to be meet the high-power pumping signal that can drive the requirement of electromagnetic ultrasonic guide wave transducer, and the waveform of this high-power pumping signal can be arbitrary, can according to different detection demands, the signal of different wave shape is selected to carry out power amplification, electromagnetic ultrasonic guide wave transducer is excited to produce required supersonic guide-wave in result to be checked.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a application's part, does not form restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structure chart of a kind of linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal that the utility model embodiment provides;
Fig. 2 is the physical circuit figure of a kind of linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal that the utility model embodiment provides;
Fig. 3 is the testing apparatus schematic diagram of a kind of linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal that the utility model embodiment provides;
Fig. 4 is the comparison diagram of a kind of pumping signal of providing of the utility model embodiment and standard input signal;
Fig. 5 is the application system schematic diagram of a kind of linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal that the utility model embodiment provides;
Fig. 6 is the timeamplitude map of a kind of detection waveform signal that the utility model embodiment provides.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with execution mode and accompanying drawing, the utility model is described in further details.At this, exemplary embodiment of the present utility model and illustrating for explaining the utility model, but not as to restriction of the present utility model.
In the utility model embodiment, provide a kind of linear power amplifying device generated for electromagnetic ultrasonic guide wave pumping signal, as shown in Figure 1, this device comprises: multiple drive power module (in FIG, for multiple drive power module for two-stage, namely comprises first order driver module 1021 and second level driver module 1022, concrete, the progression of driver module can adjust according to real needs) and multiple Linear Amplifer module 103, wherein
In multiple drive power module, the input input signal source 101 of first order driver module (such as, this signal source 101 is random waveform generation module) signal of random waveform shape that exports, multistage described driver module is used for the power output improving random waveform signal step by step, and produces the random waveform signal after the raising of multiple-channel output power;
In multiple Linear Amplifer module 103, the output of each Linear Amplifer module is in parallel, in multiple Linear Amplifer module the input of each Linear Amplifer module receive described multiple-channel output power improve after random waveform signal Zhong mono-road signal, random waveform signal Zhong mono-road signal after multiple-channel output power improves at least inputs to a Linear Amplifer module in multiple Linear Amplifer module, each Linear Amplifer module is used for carrying out Linear Amplifer to the random waveform signal of input, and the random waveform signal after output output linearity amplifies, random waveform signal after the Linear Amplifer that multiple Linear Amplifer module exports carries out power combing to generate pumping signal.
Known as shown in Figure 1, in the utility model embodiment, the power output of the random waveform signal that random waveform generation module exports is improved successively step by step by multiple drive power module, strengthen the random waveform signal after power output raising to the driving force of Linear Amplifer module, the random waveform signal that can realize after a road power output raising drives while multiple Linear Amplifer module, by the random waveform signal after the Linear Amplifer of multiple Linear Amplifer module output is carried out power combing to generate pumping signal, improve the power output of pumping signal, strengthen the driving force to electromagnetic ultrasonic guide wave transducer, this pumping signal is made to be meet the high-power pumping signal driving the requirement of electromagnetic ultrasonic guide wave transducer, and the waveform of this high-power pumping signal can be arbitrary, can according to different detection demands, the signal of different wave shape is selected to carry out power amplification, electromagnetic ultrasonic guide wave transducer is excited to produce required supersonic guide-wave in structure to be checked.
During concrete enforcement, as shown in Figure 1, first order driver module 1021 in above-mentioned multistage described driver module comprises one for improving the first linear amplifier circuit of random waveform output power signal, it is concrete that other grade of driver module 1022 in multistage described driver module comprises multiple the second linear amplifier circuit for improving random waveform output power signal, the number of the second linear amplifier circuit can adjust according to real needs, the signal of the random waveform shape of the input input signal source output of the first linear amplifier circuit, the output of the first linear amplifier circuit connects the input of each second linear amplifier circuit in next stage driver module.During concrete enforcement, as shown in Figure 1, multistage described driver module comprises first order driver module 1021 and second level driver module 1022, first order driver module 1021 comprises first linear amplifier circuit, described second level driver module 1022 comprises three the second linear amplifier circuits, the input of these three the second linear amplifier circuits all connects the output of described first linear amplifier circuit, the output of these three the second linear amplifier circuits export respectively a road power output improve after random waveform signal.To realize the power output being improved signal successively by first order driver module 1021, second level driver module 1022 step by step, produce the random waveform signal after the raising of multiple-channel output power simultaneously.
During concrete enforcement, in the present embodiment, as shown in Figure 2, in first order driver module, the first linear amplifier circuit is made up of N raceway groove insulating gate type field effect tube and peripheral component thereof, concrete, described first linear amplifier circuit, comprise: a N raceway groove insulating gate type field effect tube, the first power supply, the first resistance, the second resistance, the first inductance, the 3rd resistance, the 4th resistance, the first electric capacity and the 5th resistance, wherein, one N raceway groove insulating gate type field effect tube, N raceway groove insulating gate type field effect tube M1 as shown in Figure 2, first power supply, power supply VCC1 as shown in Figure 2, the output of described first power supply connects the first end of described first resistance, second end of described first resistance connects the first end of described second resistance, second end of described second resistance connects ground level, in fig. 2, first resistance is resistance R40, second resistance is resistance R41, and by being connected between power supply VCC1 and ground level by resistance R40 and resistance R41, the voltage after dividing potential drop provides gate bias voltage for N raceway groove insulating gate type field effect tube M1, the output of described first power supply connects the first end of described first inductance, second end of described first inductance connects the first end of described 3rd resistance, second end of described 3rd resistance connects the drain electrode of a described N raceway groove insulating gate type field effect tube, in fig. 2, this first inductance is inductance L 1,3rd resistance is resistance R2, the output voltage of voltage source V CC1 is connected on the drain electrode of N raceway groove insulating gate type field effect tube M1 after inductance L 1 and resistance R2, inductance L 1 is for clamping down on power jitter, and resistance R2 is used for arranging quiescent point, the source electrode of a described N raceway groove insulating gate type field effect tube connects the first end of described 4th resistance, second end of described 4th resistance connects described ground level, the source electrode of a described N raceway groove insulating gate type field effect tube is the output of described first linear amplifier circuit, in fig. 2, namely the 4th resistance is resistance R3, namely the source electrode of N raceway groove insulating gate type field effect tube M1 is through resistance R3 ground connection, and the direct voltage that resistance R3 gets provides gate bias voltage for next stage driver module, the grid of a described N raceway groove insulating gate type field effect tube connects the second end of described 5th resistance, second end of described first resistance and the first end of described second resistance, the first end of described 5th resistance connects the second end of described first electric capacity, the first end of described first electric capacity connects the output of described random waveform generation module, in fig. 2, namely this first electric capacity is electric capacity C5, 5th resistance is resistance R1, the random waveform signal that random waveform generation module exports is through one end of the straight isolation resistance R1 of C5 AC coupled best friend, the grid of another termination N raceway groove insulating gate type field effect tube M1 of R1, this coupling and isolation method can realize the grid random waveform signal that random waveform generation module exports being transferred to without distortion N raceway groove insulating gate type field effect tube M1, the impact of direct voltage on random waveform generation module can be eliminated again.
Based on the formation of above-mentioned the first linear amplifier circuit as shown in Figure 2, the Linear Amplifer process exchanging random waveform signal in this first linear amplifier circuit is as follows: the random waveform signal that random waveform generation module exports is through one end of the straight isolation resistance R1 of C5 AC coupled best friend, the grid of another termination N raceway groove insulating gate type field effect tube M1 of R1, the random waveform signal of entrance effect pipe M1 grid is after the Linear Amplifer of the first linear amplifier circuit, the random waveform signal exported through the tie point of resistance R3 and N raceway groove insulating gate type field effect tube M1 provides the ac input signal with random waveform shape for next stage driver module.Separately, as shown in Figure 2, electric capacity C1, C6 are connected between voltage source V CC1 and ground level, make it possible to filtering and exchange random waveform signal to the interference of voltage source V CC1.First linear amplifier circuit not only can provide DC offset voltage for next stage driver module, the ac input signal with random waveform shape that driving force can also be provided enough for next stage driver module.
During concrete enforcement, in the present embodiment, as shown in Figure 2, in other grade of driver module, the second linear amplifier circuit is made up of N raceway groove insulating gate type field effect tube and peripheral component thereof, concrete, three the second linear amplifier circuits are comprised for other grade of driver module, described second linear amplifier circuit, comprise: the 2nd N raceway groove insulating gate type field effect tube, second source, 6th resistance, second inductance, 7th resistance and the 8th resistance, wherein, 2nd N raceway groove insulating gate type field effect tube, as shown in Figure 2, it is M2 that 2nd N raceway groove insulating gate type field effect tube is respectively N raceway groove insulating gate type field effect tube in three the second linear amplifier circuits, M3, M4, second source, as shown in Figure 2, three the second linear amplifier circuits can share power supply, i.e. a voltage source V CC2, the grid of described 2nd N raceway groove insulating gate type field effect tube connects the second end of described 6th resistance, the first end of described 6th resistance is the input of described second linear amplifier circuit, as shown in Figure 2, 6th resistance is respectively resistance R4 in three the second linear amplifier circuits, R16, R28, namely the direct current biasing of the first linear amplifier circuit output is through three resistance R4, R16, R28 accesses field effect M2 respectively, M3, the grid of M4, be three N raceway groove insulating gate type field effect tube M2, M3, M4 provides identical bias voltage, realize the first linear amplifier circuit to be respectively three the second linear amplifier circuits DC offset voltage is provided, simultaneously, three resistance R4, R16, R28 can eliminate the crosstalk signal between each second linear amplifier circuit, improve the stability of whole circuit, the output of described second source connects the first end of described second inductance, second end of described second inductance connects the first end of described 7th resistance, second end of described 7th resistance connects the drain electrode of described 2nd N raceway groove insulating gate type field effect tube, as shown in Figure 2, three the second linear amplifier circuits share the second inductance, this second inductance is inductance L 2, 7th resistance is respectively R5 in three the second linear amplifier circuits, R17, R29, namely the voltage that voltage source V CC2 exports is connected to ground level by electric capacity C2 and carries out filtering, resistance R5 is connected to respectively through inductance L 2, R17, the first end of R29, resistance R5, R17, second end of R29 respectively with N raceway groove insulating gate type field effect tube M2, M3, the drain electrode of M4 is connected, inductance L 2 is for clamping down on power jitter, resistance R5, R17, R29 is respectively used to the quiescent point arranging three linear amplifier circuits, the source electrode of described 2nd N raceway groove insulating gate type field effect tube connects the first end of described 8th resistance, second end of described 8th resistance connects ground level, the source electrode of described 2nd N raceway groove insulating gate type field effect tube is the output of described second linear amplifier circuit, as shown in Figure 2, 8th resistance is respectively R6 in three the second linear amplifier circuits, R18, R30, i.e. N raceway groove insulating gate type field effect tube M2, M3, the source electrode of M4 is respectively through resistance R6, R18, R30 ground connection, N raceway groove insulating gate type field effect tube M2, M3, the second linear amplifier circuit that the direct voltage that M4 source electrode exports can be respectively in next stage driver module provides gate bias voltage.
Based on the formation of above-mentioned the second linear amplifier circuit as shown in Figure 2, in this second linear amplifier circuit, the Linear Amplifer process of random waveform signal is as follows: after the power output that in first order driver module, the first linear amplifier circuit exports improves, there is the AC signal of random waveform shape respectively by three resistance R4, R16, R28 enters N raceway groove insulating gate type field effect tube M2, M3, the grid of M4, the AC signal driving force with random waveform shape after three the second linear amplifier circuits amplify is enough, can be used for the multiple Linear Amplifer modules driving rear stage circuit respectively.
During concrete enforcement, the number of multiple Linear Amplifer module can adjust according to real needs, in the present embodiment, it is nine for the number of multiple Linear Amplifer module, during concrete enforcement, drive the number of linear amplification module can adjust according to real needs with the multiple signals Zhong Mei road signal exported through multiple drive power module, as shown in Figure 2, three Linear Amplifer modules are driven for every road signal, concrete, shown Linear Amplifer module 103, comprise: the 3rd N raceway groove insulating gate type field effect tube, 3rd power supply, 9th resistance, 3rd inductance, tenth resistance, 11 resistance, wherein, 3rd N raceway groove insulating gate type field effect tube, as shown in Figure 2, 3rd N raceway groove insulating gate type field effect tube is N raceway groove insulating gate type field effect tube M5 ~ M13 respectively in nine Linear Amplifer modules, 3rd power supply, as shown in Figure 2, nine Linear Amplifer modules share a power supply, and the 3rd power supply is power supply VCC3, the grid of described 3rd N raceway groove insulating gate type field effect tube connects the second end of described 9th resistance, and the first end of described 9th resistance is the input of described Linear Amplifer module, and in fig. 2, the 9th resistance is resistance R7 respectively in nine Linear Amplifer modules, R8, R9, R19, R20, R21, R31, R32, R33, the direct voltage that the source electrode realizing N raceway groove insulating gate type field effect tube M2 exports is respectively through resistance R7, R8, R9 inputs to N raceway groove insulating gate type field effect tube M5, M6, the grid of M7, the direct voltage of the source electrode output of N raceway groove insulating gate type field effect tube M3 is respectively through resistance R19, R20, R21 inputs to N raceway groove insulating gate type field effect tube M8, M9, the grid of M10, the direct voltage of the source electrode output of N raceway groove insulating gate type field effect tube M4 is respectively through resistance R31, R32, R33 inputs to N raceway groove insulating gate type field effect tube M11, M12, the grid of M13, simultaneously resistance R7, R8, R9, R19, R20, R21, R31, R32, R33 can isolate the crosstalk between each Linear Amplifer module, the drain electrode of described 3rd N raceway groove insulating gate type field effect tube connects the first end of described tenth resistance, second end of described tenth resistance connects the first end of described 3rd inductance, second end of described 3rd inductance connects described 3rd power supply, the drain electrode of described 3rd N raceway groove insulating gate type field effect tube is the output of described Linear Amplifer module, in fig. 2, nine Linear Amplifer modules share the 3rd inductance, 3rd inductance is inductance L 3, tenth resistance is resistance R10 respectively in nine Linear Amplifer modules, R12, R14, R22, R24, R26, R34, R36, R38, achieve voltage source V CC3 to be connected to ground level through electric capacity C3 and to carry out filtering, one end of access inductance L 3, the other end of inductance L 3 is respectively through resistance R10, R12, R14, R22, R24, R26, R34, R36, R38 serial connection is to the drain electrode of N raceway groove insulating gate type field effect tube M5 ~ M13, for the drain electrode of N raceway groove insulating gate type field effect tube M5 ~ M13 provides direct voltage, the source electrode of described 3rd N raceway groove insulating gate type field effect tube connects the first end of described 11 resistance, second end of described 11 resistance connects ground level, in fig. 2,11 resistance is resistance R11, R13, R15, R23, R25, R27, R35, R37, R39 respectively in nine Linear Amplifer modules, and namely the source electrode of N raceway groove insulating gate type field effect tube M5 ~ M13 is respectively through resistance R11, R13, R15, R23, R25, R27, R35, R37, R39 ground connection.
Based on the formation of above-mentioned Linear Amplifer module 103 as shown in Figure 2, in linear amplification module 103, the Linear Amplifer process of AC signal is as follows: the AC signal with random waveform shape that in the 2nd grade of driver module, the source electrode of the N raceway groove insulating gate type field effect tube M2 of the second linear amplifier circuit exports is respectively through resistance R7, R8, R9 accesses field effect M5, M6, the grid of M7, the AC signal with random waveform shape that in the 2nd grade of driver module, the source electrode of the N raceway groove insulating gate type field effect tube M3 of the second linear amplifier circuit exports is respectively through resistance R19, R20, R21 accesses field effect M8, M9, the grid of M10, the AC signal with random waveform shape that in the 2nd grade of driver module, the source electrode of the effect pipe M4 of the second linear amplifier circuit exports is respectively through resistance R31, R32, R33 accesses field effect M11, M12, the grid of M13, N raceway groove insulating gate type field effect tube M5 ~ M13 carries out Linear Amplifer to the AC signal with random waveform shape of separately input respectively, the AC signal with random waveform shape after the drain electrode of N raceway groove insulating gate type field effect tube M5 ~ M13 exports respective Linear Amplifer respectively.
During concrete enforcement, the above-mentioned linear power amplifying device generated for electromagnetic ultrasonic guide wave pumping signal, also comprise: electric capacity, one end of described electric capacity connects the input of electromagnetic ultrasonic guide wave transducer, the output of the other end multiple Linear Amplifer module in parallel of described electric capacity.Concrete, as shown in Figure 2, the drain electrode parallel connection of N raceway groove insulating gate type field effect tube M5 ~ M13 outputs signal as direct current biasing superposing the AC signal with random waveform shape afterwards, AC coupled can be carried out by serial capacitance C4 (i.e. above-mentioned electric capacity) between N raceway groove insulating gate type field effect tube M5 ~ M13 drain electrode parallel outputs and electromagnetic ultrasonic guide wave transducer (EMAT), this coupled modes both can DC-offset correction voltage on the impact of electromagnetic ultrasonic guide wave transducer, can be again electromagnetic ultrasonic guide wave transducer Linear Amplifer is provided after the satisfied high-power random waveform signal that electromagnetic ultrasonic guide wave transducer can be driven to require.
In order to illustrate that the above-mentioned linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal can export the satisfied high-power pumping signal that electromagnetic ultrasonic guide wave transducer can be driven to require of random waveform, in the present embodiment, testing apparatus has as shown in Figure 3 been built.When adopting this test system and test, any waveform generating module 301 output amplitude is 5 cycle Sine wave adding Hanning window modulation of 2V, 50 ohm of resistive loads 303 of rear drive standard are amplified through the above-mentioned linear power amplifying device 302 for the generation of electromagnetic ultrasonic guide wave pumping signal, oscilloscope 305 is accessed by 10dB attenuator 304, the waveform gathered as shown in Figure 4, in Fig. 4, solid line is the output signal that oscilloscope 305 gathers, and dotted line is the 5 cycle criterion sinusoidal input signal adding Hanning window modulation.As can be seen from Figure 4, the peak-to-peak value power of oscilloscope 305 output waveforms is 800W, and with to add wave distortion compared with 5 cycle criterion sinusoidal input signal that Hanning window modulates very little, illustrate that the above-mentioned linear power amplifying device 302 generated for electromagnetic ultrasonic guide wave pumping signal can realize the high-power Linear Amplifer to random waveform signal.
For illustrating that the pumping signal of the above-mentioned linear power amplifying device output for the generation of electromagnetic ultrasonic guide wave pumping signal can drive electromagnetic ultrasonic guide wave transducer to produce supersonic guide-wave in structure to be checked, in the present embodiment, build test macro as shown in Figure 5.When the actual test of this test macro of employing, employing random waveform generation module 501 output amplitude is 5 cycle Sine wave adding Hanning window modulation of 2V, amplify rear drive transmitting electromagnetic ultrasonic guide wave transducer 503 through the above-mentioned linear power amplifying device 502 for the generation of electromagnetic ultrasonic guide wave pumping signal and produce supersonic guide-wave in iron plate 504 to be checked, another receive electromagnetic ultrasonic guide wave transducer 505 to pick up in iron plate 504 to be measured produce ultrasonic guided wave signals, the signal picked up is after the low level signal amplification module 506 that multiplication factor is 100dB is amplified, the waveform detected by oscilloscope 507 as shown in Figure 6.As can be seen from Figure 6, the signal to noise ratio of institute's detection waveform is better, obviously can tell direct wave 1 and end face reflection echo 2, illustrates that the above-mentioned linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal can drive electromagnet ultrasonic changer to produce supersonic guide-wave.
In the utility model embodiment, the power output of the random waveform signal that random waveform generation module exports is improved successively step by step by multiple drive power module, strengthen the random waveform signal after power output raising to the driving force of Linear Amplifer module, the random waveform signal that can realize after a road power output raising drives while multiple Linear Amplifer module, by the random waveform signal after the Linear Amplifer of multiple Linear Amplifer module output is carried out power combing to generate pumping signal, improve the power output of the pumping signal that exciting bank exports, strengthen the driving force to electromagnetic ultrasonic guide wave transducer, this pumping signal is made to be meet the high-power pumping signal that can drive the requirement of electromagnetic ultrasonic guide wave transducer, and the waveform of this high-power pumping signal can be arbitrary, can according to different detection demands, the signal of different wave shape is selected to carry out power amplification, electromagnetic ultrasonic guide wave transducer is excited to produce required supersonic guide-wave in structure to be checked.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model embodiment can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (7)
1., for the linear power amplifying device that electromagnetic ultrasonic guide wave pumping signal generates, it is characterized in that, comprising: multiple drive power module and multiple Linear Amplifer module, wherein,
The signal of the random waveform shape that the input input signal source of first order driver module exports in multiple drive power module, multistage described driver module is used for the power output improving signal step by step, and produces the random waveform signal after the raising of multiple-channel output power;
In multiple Linear Amplifer module, the output of each Linear Amplifer module is in parallel, in multiple Linear Amplifer module the input of each Linear Amplifer module receive described multiple-channel output power improve after random waveform signal Zhong mono-road signal, random waveform signal Zhong mono-road signal after multiple-channel output power improves at least inputs to a Linear Amplifer module in multiple Linear Amplifer module, each Linear Amplifer module is used for carrying out Linear Amplifer to the random waveform signal of input, and the signal of random waveform shape after output output linearity amplifies, the signal of the random waveform shape after the Linear Amplifer that multiple Linear Amplifer module exports carries out power combing to generate pumping signal.
2. device as claimed in claim 1, it is characterized in that, first order driver module in multistage described driver module comprises one for improving the first linear amplifier circuit of the power output of signal, other grade of driver module in multistage described driver module comprises the second linear amplifier circuit of multiple power output for improving signal, the signal of the random waveform shape of the input input signal source output of the first linear amplifier circuit, the output of the first linear amplifier circuit connects the input of each second linear amplifier circuit in next stage driver module.
3. device as claimed in claim 2, it is characterized in that, multistage described driver module comprises first order driver module and second level driver module, described first order driver module comprises first linear amplifier circuit, described second level driver module comprises three the second linear amplifier circuits, the input of these three the second linear amplifier circuits all connects the output of described first linear amplifier circuit, the output of these three the second linear amplifier circuits export respectively a road power output improve after random waveform signal.
4. device as claimed in claim 2, it is characterized in that, described first linear amplifier circuit, comprising:
One N raceway groove insulating gate type field effect tube, the first power supply, the first resistance, the second resistance, the first inductance, the 3rd resistance, the 4th resistance, the first electric capacity and the 5th resistance, wherein,
The output of described first power supply connects the first end of described first resistance, and the second end of described first resistance connects the first end of described second resistance, and the second end of described second resistance connects ground level;
The output of described first power supply connects the first end of described first inductance, and the second end of described first inductance connects the first end of described 3rd resistance, and the second end of described 3rd resistance connects the drain electrode of a described N raceway groove insulating gate type field effect tube;
The source electrode of a described N raceway groove insulating gate type field effect tube connects the first end of described 4th resistance, second end of described 4th resistance connects described ground level, and the source electrode of a described N raceway groove insulating gate type field effect tube is the output of described first linear amplifier circuit;
The grid of a described N raceway groove insulating gate type field effect tube connects the first end of the second end of described 5th resistance, the second end of described first resistance and described second resistance, the first end of described 5th resistance connects the second end of described first electric capacity, and the first end of described first electric capacity connects the output of described random waveform generation module.
5. device as claimed in claim 2, it is characterized in that, described second linear amplifier circuit, comprising:
2nd N raceway groove insulating gate type field effect tube, second source, the 6th resistance, the second inductance, the 7th resistance and the 8th resistance, wherein,
The grid of described 2nd N raceway groove insulating gate type field effect tube connects the second end of described 6th resistance, and the first end of described 6th resistance is the input of described second linear amplifier circuit;
The output of described second source connects the first end of described second inductance, and the second end of described second inductance connects the first end of described 7th resistance, and the second end of described 7th resistance connects the drain electrode of described 2nd N raceway groove insulating gate type field effect tube;
The source electrode of described 2nd N raceway groove insulating gate type field effect tube connects the first end of described 8th resistance, and the second end of described 8th resistance connects ground level, and the source electrode of described 2nd N raceway groove insulating gate type field effect tube is the output of described second linear amplifier circuit.
6. the device according to any one of claim 1 to 5, is characterized in that, described Linear Amplifer module, comprising:
3rd N raceway groove insulating gate type field effect tube, the 3rd power supply, the 9th resistance, the 3rd inductance, the tenth resistance, the 11 resistance, wherein,
The grid of described 3rd N raceway groove insulating gate type field effect tube connects the second end of described 9th resistance, and the first end of described 9th resistance is the input of described Linear Amplifer module;
The drain electrode of described 3rd N raceway groove insulating gate type field effect tube connects the first end of described tenth resistance, second end of described tenth resistance connects the first end of described 3rd inductance, second end of described 3rd inductance connects described 3rd power supply, and the drain electrode of described 3rd N raceway groove insulating gate type field effect tube is the output of described Linear Amplifer module;
The source electrode of described 3rd N raceway groove insulating gate type field effect tube connects the first end of described 11 resistance, and the second end of described 11 resistance connects ground level.
7. the device according to any one of claim 1 to 5, is characterized in that, also comprises:
Electric capacity, the output of first end multiple Linear Amplifer module in parallel of described electric capacity, the second end of described electric capacity connects the input of electromagnetic ultrasonic guide wave transducer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520495147.2U CN204697018U (en) | 2015-07-09 | 2015-07-09 | For the linear power amplifying device that electromagnetic ultrasonic guide wave pumping signal generates |
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| CN201520495147.2U CN204697018U (en) | 2015-07-09 | 2015-07-09 | For the linear power amplifying device that electromagnetic ultrasonic guide wave pumping signal generates |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935276A (en) * | 2015-07-09 | 2015-09-23 | 中国特种设备检测研究院 | Linear power amplifying device for generating electromagnetic ultrasonic guided-wave excitation signal |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935276A (en) * | 2015-07-09 | 2015-09-23 | 中国特种设备检测研究院 | Linear power amplifying device for generating electromagnetic ultrasonic guided-wave excitation signal |
| CN104935276B (en) * | 2015-07-09 | 2018-03-13 | 中国特种设备检测研究院 | Linear power amplifying device for the generation of electromagnetic ultrasonic guide wave pumping signal |
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