CN201051092Y - A sound and ultrasonic no damage detection device - Google Patents
A sound and ultrasonic no damage detection device Download PDFInfo
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- CN201051092Y CN201051092Y CNU2007200074176U CN200720007417U CN201051092Y CN 201051092 Y CN201051092 Y CN 201051092Y CN U2007200074176 U CNU2007200074176 U CN U2007200074176U CN 200720007417 U CN200720007417 U CN 200720007417U CN 201051092 Y CN201051092 Y CN 201051092Y
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Abstract
The utility model discloses a sound/supersonic lossless detection device, which comprises an electro-acoustic transducer, a wave generator, a front amplification gains controller, a phase sensitive wave detector, an A/D converter and a computer process system, wherein the electro-acoustic transducer detects the properties of the subject materials such as compound materials via direct contact coupling mode or couplant coupling mode, the wave generator can stimulate the electro-acoustic transducer with a single or double probe structure via variable sine, impulse or triangle wave, the phase sensitive wave detector employs phase sensitive wave detection technique to process range phase change of feedback echo wave, moreover, aiming at different frequency pickup signals, the computer process system removes certain interface signals via mixture process mode, that is to remove false detection. The principle of the process is to employ advanced multiple frequency and spectrum analysis techniques used in vortex detection to process the information obtained by the electro-acoustic converter, thereby obtaining all detection properties which do not exist in prior acoustic vibration detection.
Description
Technical field
The utility model relates to a kind of sound, ultrasonic probe device of carrying out Non-Destructive Testing of utilizing, and particularly relates to a kind of utilization sound, the ultrasonic probe device to the Non-Destructive Testing of material (as adhesives) performance quality (as the material density homogeneity).
Background technology
Non-Destructive Testing (nondestructive test) is called for short NDT, is not destroy and damage the examined object body, and to its performance, quality, a kind of technology that has or not inherent vice to detect, the cannot-harm-detection device is to realize the equipment of Non-Destructive Testing.In existing lossless detection method, ultrasound examination is one of main method of Non-Destructive Testing, Ultrasonic Detection (UT) is when utilizing ultrasound wave to propagate in detected material, the acoustic characteristic of material and the variation of interior tissue produce certain influence to hyperacoustic propagation, understand material property and structural change by the detection to ultrasound wave degree of susceptibility and situation.When ultrasound wave enters object and runs into defective, part sound wave can produce reflection, transmit and receive device by reflection wave is analyzed, measure material thickness, find the inherent vice hidden, or analyze such as properties of materials such as metal, plastics, compound substance, pottery, rubber and glass etc.Ultrasound examination is to use high-frequency, when high directed sound wave ultrasound wave is propagated in detected material, the acoustic characteristic of material and the variation of interior tissue produce certain influence to hyperacoustic propagation, by detection, understand the performance and the structural change of detected material to ultrasound wave degree of susceptibility and situation.Such as, when ultrasound wave is used for Non-Destructive Testing to metal material, utilize ultrasonic energy to penetrate the depths of metal material exactly, and when entering another cross section by a cross section, in interface edge the characteristics of reflection take place, realize Non-Destructive Testing to the metal material defective, in fact, ultrasound wave is almost completely can not be by the interface of air and Metal Contact, and promptly when ultrasound wave passes to metal by air or passes to air by metal, similar 99% is gone back by this boundary reflection.Therefore, when ultrasound wave runs into defective by the transmitting probe biography to metal, just reflected back by the air of fault location and metal interface, ultrasound wave incident as a result once the side have acoustic reflection to return, and the opposing party of defective owing to can not see through ultrasound wave, just can produce projected area and defective akin " shade ", utilize this phenomenon can find defective.Ultrasound examination mainly contains reflectometry and through transmission technique, when adopting reflectometry, be that hyperacoustic transmitting probe and receiving transducer are combined, when being used for adhesive layer to the junction and detecting, when not having defective in the adhesive layer of junction, ultrasound wave is promptly returned from the junction bottom reflection, when having defective in the adhesive layer of junction, then a part of ultrasound wave runs into defective and is reflected earlier, the signal that occurs is more Zao than the signal of returning from the junction bottom reflection, thereby can judge the existence of defective.But, the ultrasonic detection device of prior art is when realizing ultrasound examination, owing to be to differentiate the existence of defective by accepting hyperacoustic mode that tested object reflects or penetrate, be easy to be subjected to the interference of various frequency signals, cause to detect deviation to occur, thereby influenced the accuracy that detects.
The utility model content
The purpose of this utility model is to overcome the deficiency of prior art, a kind of sound, Ultrasonic NDT device are provided, the mode that employing sound, ultrasonic probe are coupled with direct Contact Coupled or couplant, measured material such as performance of composites quality are carried out Non-Destructive Testing, phase sensitive detection filtering by phase-sensitive detector (PSD), can reach the promptly so-called detection effect of eliminating the false and retaining the true of removal undesired signal, make it to obtain to shake for existing and detect not available all detection characteristics.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of sound, Ultrasonic NDT device comprise:
One electroacoustics transducer that is made by piezoelectric or magnetostriction materials includes transmitter and receiver, and to measured medium emission sound wave, ultrasound wave, receiver receives sound wave, ultrasound wave by the echo behind the measured medium after the transmitter excited target;
One waveform generator sends variable sine, pulse or triangular wave to electroacoustics transducer;
One pre-amp gain controller carries out processing and amplifying with input signal;
One phase-sensitive detector (PSD) carries out phase sensitive detection to input signal and handles, and output has the signal of the two-dimensional signal of X/Y component;
One A/D converter carries out mould/number conversion with input signal;
One computer processing system calculates, handles, analyzes input signal, and the output control signal;
The input of waveform generator is connected to computer system, and the latter exports control signal to the former makes the former produce corresponding waveform string; The output of waveform generator is connected to electroacoustics transducer and phase-sensitive detector (PSD) respectively, and waveform generator is to electroacoustics transducer output drive signal, to phase-sensitive detector (PSD) output comparison signal; Produce corresponding vibration after the transmitter excited target of electroacoustics transducer and to measured medium emission sound wave, the ultrasound wave of direct Contact Coupled or couplant coupling, receiver receive sound wave, ultrasound wave after by measured medium echo and the vibration of echo be converted to electric signal export to the pre-amp gain controller; The output of pre-amp gain controller is connected to the input of phase-sensitive detector (PSD), exports to phase-sensitive detector (PSD) after the signal that electroacoustics transducer is defeated by is amplified; The output of phase-sensitive detector (PSD) is connected to A/D converter, and phase-sensitive detector (PSD) carries out phase sensitive detection to the output signal of pre-amp gain controller to be handled, and the signal that draws the two-dimensional signal with X/Y component is defeated by A/D converter; The output of A/D converter is connected to computer processing system, computer processing system is handled input signal, and the control signal output of computer processing system is connected to the control end of electroacoustics transducer, pre-amp gain controller, phase-sensitive detector (PSD), A/D converter respectively.
Described electroacoustics transducer is single sonde configuration, and transmitter and receiver are contained in the probe.
Described electroacoustics transducer is two sonde configurations, and transmitter and receiver are contained in respectively in two probes.
A kind of sound of the present utility model, Ultrasonic NDT device, specific acoustic impedance that can be by measuring measured medium and/or sound wave, the velocity of propagation of ultrasound wave in measured medium test out the density or the thickness of measured medium, and by the density analysis of measured medium further being judged size and the position that whether has defective and defective in the measured medium.Usually the specific acoustic impedance of measured medium and sound wave, the velocity of propagation of ultrasound wave in measured medium are to become single valued relation with the density or the thickness of measured medium.
A kind of sound of the present utility model, Ultrasonic NDT device, adopt electroacoustics transducer realization sound, ultrasound examination, sound, hyperacoustic acoustic characteristic have been utilized, when sound wave, ultrasound wave enter another kind of medium from a kind of medium, because two media density difference, thereby at the two media interphase, its direction propagation can change: wherein a part is refracted into another kind of medium, and another part is reflected.Simultaneously, sound wave, ultrasound wave are in communication process, owing to be subjected to the obstruction or the absorption of impurity in medium and the medium, its intensity can produce decay.Therefore, when sound wave, ultrasound wave are propagated in measured medium, the acoustic characteristic of measured medium material and the variation of interior tissue produce certain influence to sound wave, hyperacoustic propagation, understand material property and the structural change that to measure measured medium by detection to sound wave, ultrasound wave degree of susceptibility and situation.Sound wave, hyperacoustic good directionality, frequency is high more, and directivity is good more, with the radiation in medium of very narrow wave beam, is easy to determine the position of defective.Wherein, the width of sound or ultrasonic pulse is no more than sound wave or ultrasound wave travel-time from the transmitter to the receiver in measured medium; Or the width of sound or ultrasonic pulse passes through the twice of measured medium xsect time less than sound wave or ultrasound wave.
A kind of sound of the present utility model, Ultrasonic NDT device, adopt phase-sensitive detector (PSD) that the echo that electroacoustics transducer receives is carried out the phase sensitive detection Filtering Processing, phase sensitive detection is a kind of method of obtaining range signal from phase signal, it is usually by a reference signal (with input signal frequency together) and input signal effect, thereby the range signal that polarization can just can born output, phase change by monitoring gained signal becomes frequency modulation angle modulation ripple, and then simplifies the difficulty of demodulation.The principle of phase sensitive detection is, if control signal and input signal phase difference are between 0 to 90 degree, output is reduced to zero gradually from maximum, therefore, select control signal and undesired signal phase differential 90 degree to carry out detection, just can in output signal, eliminate undesired signal and keep useful signal (because of having phase differential between useful signal and the undesired signal).
A kind of sound of the present utility model, Ultrasonic NDT device, when electroacoustics transducer adopts single sonde configuration, transmitter and receiver are to be contained in the same probe, continuous wave that presets that transmitter is subjected to that waveform generator sends or pulse signal encourage and produce vibration, emission sound wave, ultrasound wave, receiver is used to receive sound wave, hyperacoustic reflection wave, and the vibration of the reflection wave that receives is converted into electric signal, because transmitter becomes an integral body with receiver, therefore, transmitter emitting sound wave, ultrasound wave are normally towards the normal direction of measured medium.When electroacoustics transducer adopts two sonde configuration, transmitter and receiver branch are contained in respectively in two probes, two probes can be placed on the same one side in measured medium cross section, also can be placed on the both sides in measured medium cross section, when transmitter and receiver are in the same one side in measured medium cross section, continuous wave that presets that transmitter is subjected to that waveform generator sends or pulse signal encourage and produce vibration, the emission sound wave, ultrasound wave, receiver is used to receive sound wave, hyperacoustic reflection wave, and the vibration of the reflection wave that receives is converted into electric signal, owing to have certain distance between transmitter and the receiver, therefore, transmitter emitting sound wave, ultrasound wave normally has certain angle towards the normal direction with measured medium; When transmitter and receiver were in the both sides in measured medium cross section, transmitter was used to launch sound wave, ultrasound wave, and receiver is used to receive sound wave, ultrasound wave passes the ejected wave of wearing of medium, and the vibration of wearing ejected wave that will receive is converted into electric signal.
A kind of sound of the present utility model, Ultrasonic NDT device, the supersaturation excitation of acoustic connection, its higher harmonic components that inspires can be used for the discontinuous detection of material, comprises physicochemical property and gauge measurement etc.
A kind of sound of the present utility model, Ultrasonic NDT device when carrying out sound, Ultrasonic NDT, comprise and demarcate and survey two processes:
In calibration process: be to detect with the mode of direct Contact Coupled or couplant coupling measured medium to known substance density or thickness with electroacoustics transducer, the transmitter of electroacoustics transducer is encouraged by waveform generator sent a continuous wave that presets or pulse signal and is sent sound wave or ultrasound wave to measured medium, the output of the receiver of electroacoustics transducer is sent into phase-sensitive detector (PSD) after the pre-amp gain controller amplifies, include and known substances density or the corresponding specific acoustic impedance variation of thickness and/or the phase place of velocity of propagation variation and the electric signal of amplitude characteristic through becoming one after phase sensitive detection and the filtering, subsequently this signal decomposition is become two orthogonal components of X and Y, again after the analog to digital conversion of A/D converter, send computer processing system, carry out digital filtering, the phase place rotation, the multifrequency Frequency mixing processing, and be processed into known substance density or the corresponding data of thickness with measured medium by the data processing unit of computer system, then, constantly change the known substance density of measured medium or the size of thickness, repeat above-mentioned test process, obtain the known substance density of some and measured medium or the corresponding data of size variation of thickness, and with the material density of measured medium or the corresponding relation data storage between thickness and the test data in the storage unit of computer system;
At test process: be measured medium to be detected with the mode of electroacoustics transducer with direct Contact Coupled or couplant coupling, the transmitter of electroacoustics transducer is encouraged by waveform generator sent a continuous wave that presets or pulse signal and is sent sound wave or ultrasound wave to measured medium, the output of the receiver of electroacoustics transducer is sent into phase-sensitive detector (PSD) after the pre-amp gain controller amplifies, include specific acoustic impedance variation and/or the phase place of velocity of propagation variation and the electric signal of amplitude characteristic through becoming one after phase sensitive detection and the filtering, subsequently this signal decomposition is become two orthogonal components of X and Y, again after the analog to digital conversion of A/D converter, send computer processing system, carry out digital filtering, the phase place rotation, the multifrequency Frequency mixing processing, and be processed into the data that are associated with the material density or the thickness of measured medium by the data processing unit of computer system, then, in computer system, the data that computing machine system memory unit in these data and the calibration process is stored compare, find out the magnitude numerical value of pairing material density of adjacent two data or thickness, then adopt linear computing method to calculate the value of the material density or the thickness of measured medium, by judging to the analysis of material density whether measured medium exists the size and the position of defective and defective.
The beneficial effects of the utility model are, owing to adopted an electroacoustics transducer that is made by piezoelectric or magnetostriction materials, one waveform generator, one pre-amp gain controller, one phase-sensitive detector (PSD), one A/D converter, one computer processing system constitutes sound, the Ultrasonic NDT device, electroacoustics transducer is in the mode of direct Contact Coupled or couplant coupling, measured material such as performance of composites (as bonding) quality are carried out Non-Destructive Testing, waveform generator is with variable sine, the continuous wave mode of pulse or triangular wave encourages list, the electroacoustics transducer of two sonde configurations, the amplitude-phase that phase-sensitive detector (PSD) adopts the phase sensitive detection technology to handle the feedback echo changes, the signal that computer processing system then picks up at different frequency reaches by the Frequency mixing processing mode removes some undesired signal, promptly so-called detection effect of eliminating the false and retaining the true, the application mechanism of this method is to adopt the advanced at present multifrequency that is used for EDDY CURRENT, spectrum analysis technique is handled the information that electroacoustic transducer obtains, and makes it to obtain to shake for existing to detect not available all detection characteristics.
Below in conjunction with drawings and Examples the utility model is described in further detail; But a kind of sound of the present utility model, Ultrasonic NDT device are not limited to embodiment.
Description of drawings
Fig. 1 is a theory diagram of the present utility model.
Embodiment
Shown in accompanying drawing, a kind of sound of the present utility model, Ultrasonic NDT device comprise:
One electroacoustics transducer 1 that is made by piezoelectric or magnetostriction materials includes transmitter and receiver, and to measured medium emission sound wave, ultrasound wave, receiver receives sound wave, ultrasound wave by the echo behind the measured medium after the transmitter excited target;
One waveform generator 2 sends variable sine, pulse or triangular wave to electroacoustics transducer 1;
One pre-amp gain controller 3 carries out processing and amplifying with input signal;
One phase-sensitive detector (PSD) 4 carries out phase sensitive detection to input signal and handles, and output has the signal of the two-dimensional signal of X/Y component;
One A/D converter 5 carries out mould/number conversion with input signal;
One computer processing system 6 calculates, handles, analyzes input signal, and the output control signal;
The input of waveform generator 1 is connected to computer system 6, and the latter exports control signal to the former makes the former produce corresponding waveform string; The output of waveform generator 1 is connected to electroacoustics transducer 2 and phase-sensitive detector (PSD) 4 respectively, and waveform generator 1 is to electroacoustics transducer 2 output drive signals, to phase-sensitive detector (PSD) 4 output comparison signals; Produce corresponding vibration after the transmitter excited target of electroacoustics transducer 2 and to measured medium emission sound wave, the ultrasound wave of direct Contact Coupled or couplant coupling, receiver receive sound wave, ultrasound wave after by measured medium echo and the vibration of echo be converted to electric signal export to pre-amp gain controller 3; The output of pre-amp gain controller 3 is connected to the input of phase-sensitive detector (PSD) 4, exports to phase-sensitive detector (PSD) 4 after the signal that electroacoustics transducer 2 is defeated by is amplified; The output of phase-sensitive detector (PSD) 4 is connected to A/D converter 5, and the output signal of 4 pairs of pre-amp gain controllers 3 of phase-sensitive detector (PSD) is carried out the phase sensitive detection processing, and the signal that draws the two-dimensional signal with X/Y component is defeated by A/D converter 5; The output of A/D converter 5 is connected to computer processing system 6,6 pairs of input signals of computer processing system are handled, and the control signal output of computer processing system 6 is connected to the control end of electroacoustics transducer 2, pre-amp gain controller 3, phase-sensitive detector (PSD) 4, A/D converter 5 respectively.
A kind of sound of the present utility model, Ultrasonic NDT device, specific acoustic impedance that can be by measuring measured medium and/or sound wave, the velocity of propagation of ultrasound wave in measured medium test out the density or the thickness of measured medium, and by the density analysis of measured medium further being judged size and the position that whether has defective and defective in the measured medium.Usually the specific acoustic impedance of measured medium and sound wave, the velocity of propagation of ultrasound wave in measured medium are to become single valued relation with the density or the thickness of measured medium.
A kind of sound of the present utility model, Ultrasonic NDT device, adopt electroacoustics transducer 2 realization sound, ultrasound examination, sound, hyperacoustic acoustic characteristic have been utilized, when sound wave, ultrasound wave enter another kind of medium from a kind of medium, because two media density difference, thereby at the two media interphase, its direction propagation can change: wherein a part is refracted into another kind of medium, and another part is reflected.Simultaneously, sound wave, ultrasound wave are in communication process, owing to be subjected to the obstruction or the absorption of impurity in medium and the medium, its intensity can produce decay.Therefore, when sound wave, ultrasound wave are propagated in measured medium, the acoustic characteristic of measured medium material and the variation of interior tissue produce certain influence to sound wave, hyperacoustic propagation, understand material property and the structural change that to measure measured medium by detection to sound wave, ultrasound wave degree of susceptibility and situation.Sound wave, hyperacoustic good directionality, frequency is high more, and directivity is good more, with the radiation in medium of very narrow wave beam, is easy to determine the position of defective.Wherein, the width of sound or ultrasonic pulse is no more than sound wave or ultrasound wave travel-time from the transmitter to the receiver in measured medium; Or the width of sound or ultrasonic pulse passes through the twice of measured medium xsect time less than sound wave or ultrasound wave.
A kind of sound of the present utility model, Ultrasonic NDT device, the echo that adopts 4 pairs of electroacoustics transducers of phase-sensitive detector (PSD) 2 to receive carries out the phase sensitive detection Filtering Processing, phase sensitive detection is a kind of method of obtaining range signal from phase signal, it is usually by a reference signal (with input signal frequency together) and input signal effect, thereby the range signal that polarization can just can born output, phase change by monitoring gained signal becomes frequency modulation angle modulation ripple, and then simplifies the difficulty of demodulation.The principle of phase sensitive detection is, if control signal and input signal phase difference are between 0 to 90 degree, output is reduced to zero gradually from maximum, therefore, select control signal and undesired signal phase differential 90 degree to carry out detection, just can in output signal, eliminate undesired signal and keep useful signal (because of having phase differential between useful signal and the undesired signal).
A kind of sound of the present utility model, Ultrasonic NDT device, electroacoustics transducer 2 can be single sonde configuration, transmitter and receiver are contained in the probe; Also can be two sonde configurations, transmitter and receiver are contained in respectively in two probes.When electroacoustics transducer 2 adopts single sonde configuration, transmitter and receiver are to be contained in the same probe, continuous wave that presets that transmitter is subjected to that waveform generator 1 sends or pulse signal encourage and produce vibration, emission sound wave, ultrasound wave, receiver is used to receive sound wave, hyperacoustic reflection wave, and the vibration of the reflection wave that receives is converted into electric signal, because transmitter becomes an integral body with receiver, therefore, transmitter emitting sound wave, ultrasound wave are normally towards the normal direction of measured medium.When electroacoustics transducer 2 adopts two sonde configuration, transmitter and receiver branch are contained in respectively in two probes, two probes can be placed on the same one side in measured medium cross section, also can be placed on the both sides in measured medium cross section, when transmitter and receiver are in the same one side in measured medium cross section, continuous wave that presets that transmitter is subjected to that waveform generator 1 sends or pulse signal encourage and produce vibration, the emission sound wave, ultrasound wave, receiver is used to receive sound wave, hyperacoustic reflection wave, and the vibration of the reflection wave that receives is converted into electric signal, owing to have certain distance between transmitter and the receiver, therefore, transmitter emitting sound wave, ultrasound wave normally has certain angle towards the normal direction with measured medium; When transmitter and receiver were in the both sides in measured medium cross section, transmitter was used to launch sound wave, ultrasound wave, and receiver is used to receive sound wave, ultrasound wave passes the ejected wave of wearing of medium, and the vibration of wearing ejected wave that will receive is converted into electric signal.
A kind of sound of the present utility model, Ultrasonic NDT device can be used for detecting compound substance (as adhesive layer) performance quality, during detection, comprise and demarcate and survey two processes:
In calibration process: be to detect with the mode of direct Contact Coupled or couplant coupling demarcation compound substance to known density with electroacoustics transducer 2, the transmitter of electroacoustics transducer 2 is encouraged by waveform generator 1 sent a continuous wave that presets or pulse signal and is sent sound wave or ultrasound wave to measured medium, the output of the receiver of electroacoustics transducer 2 is sent into phase-sensitive detector (PSD) 4 after pre-amp gain controller 3 amplifies, include and the corresponding specific acoustic impedance variation of known density and/or the phase place of velocity of propagation variation and the electric signal of amplitude characteristic through becoming one after phase sensitive detection and the filtering, subsequently this signal decomposition is become two orthogonal components of X and Y, again after the analog to digital conversion of A/D converter 5, send computer processing system 6, carry out digital filtering, the phase place rotation, the multifrequency Frequency mixing processing, and the corresponding data of known density that are processed into and demarcate compound substance by the data processing unit of computer system 6, then, constantly change the size of the known density of demarcating compound substance, repeat above-mentioned test process, obtain the corresponding data of the size variation some and known density of demarcating compound substance, and will demarcate the density of compound substance and the corresponding relation data storage between the test data in the storage unit of computer system;
At test process: be tested compound substance to be detected with the mode of electroacoustics transducer 2 with direct Contact Coupled or couplant coupling, the transmitter of electroacoustics transducer 2 is encouraged by waveform generator 1 sent a continuous wave that presets or pulse signal and is sent sound wave or ultrasound wave to tested compound substance, the output of the receiver of electroacoustics transducer 2 is sent into phase-sensitive detector (PSD) 4 after pre-amp gain controller 3 amplifies, include specific acoustic impedance variation and/or the phase place of velocity of propagation variation and the electric signal of amplitude characteristic through becoming one after phase sensitive detection and the filtering, subsequently this signal decomposition is become two orthogonal components of X and Y, again after the analog to digital conversion of A/D converter 5, send computer processing system 6, carry out digital filtering, the phase place rotation, the multifrequency Frequency mixing processing, and be processed into the data that are associated with the density of tested compound substance by the data processing unit of computer system 6, then, in computer system 6, the data that computer system 6 storage unit in these data and the calibration process are stored compare, find out the magnitude numerical value of the pairing density of adjacent two data, then adopt linear computing method to calculate the value of the density of tested compound substance, by judging to the analysis of density whether tested compound substance exists the size and the position of defective and defective.
A kind of sound of the present utility model, Ultrasonic NDT device can be used for detecting the thickness of plastics, during detection, comprise and demarcate and survey two processes:
In calibration process: be to detect with the mode of direct Contact Coupled or couplant coupling demarcation plastics to known thickness with electroacoustics transducer 2, the transmitter of electroacoustics transducer 2 is encouraged by waveform generator 1 sent a continuous wave that presets or pulse signal and is sent sound wave or ultrasound wave to measured medium, the output of the receiver of electroacoustics transducer 2 is sent into phase-sensitive detector (PSD) 4 after pre-amp gain controller 3 amplifies, include and the corresponding specific acoustic impedance variation of known thickness and/or the phase place of velocity of propagation variation and the electric signal of amplitude characteristic through becoming one after phase sensitive detection and the filtering, subsequently this signal decomposition is become two orthogonal components of X and Y, again after the analog to digital conversion of A/D converter 5, send computer processing system 6, carry out digital filtering, the phase place rotation, the multifrequency Frequency mixing processing, and the corresponding data of known thickness that are processed into and demarcate plastics by the data processing unit of computer system 6, then, constantly change the size of the known thickness of demarcating plastics, repeat above-mentioned test process, obtain the corresponding data of the size variation some and known thickness of demarcating plastics, and will demarcate the thickness of plastics and the corresponding relation data storage between the test data in the storage unit of computer system;
At test process: be tested plastics to be detected with the mode of electroacoustics transducer 2 with direct Contact Coupled or couplant coupling, the transmitter of electroacoustics transducer 2 is encouraged by waveform generator 1 sent a continuous wave that presets or pulse signal and is sent sound wave or ultrasound wave to tested plastics, the output of the receiver of electroacoustics transducer 2 is sent into phase-sensitive detector (PSD) 4 after pre-amp gain controller 3 amplifies, include specific acoustic impedance variation and/or the phase place of velocity of propagation variation and the electric signal of amplitude characteristic through becoming one after phase sensitive detection and the filtering, subsequently this signal decomposition is become two orthogonal components of X and Y, again after the analog to digital conversion of A/D converter 5, send computer processing system 6, carry out digital filtering, the phase place rotation, the multifrequency Frequency mixing processing, and be processed into the data that are associated with the thickness of tested plastics by the data processing unit of computer system 6, then, in computer system 6, the data that computer system 6 storage unit in these data and the calibration process are stored compare, find out the magnitude numerical value of the pairing thickness of adjacent two data, then adopt linear computing method to calculate the value of the thickness of tested plastics.
The foregoing description only is used for further specifying a kind of sound of the present utility model, Ultrasonic NDT device; but the utility model is not limited to embodiment; every foundation technical spirit of the present utility model all falls in the protection domain of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.
Claims (3)
1. a sound, Ultrasonic NDT device is characterized in that: comprising:
One electroacoustics transducer that is made by piezoelectric or magnetostriction materials includes transmitter and receiver, and to measured medium emission sound wave, ultrasound wave, receiver receives sound wave, ultrasound wave by the echo behind the measured medium after the transmitter excited target;
One waveform generator sends variable sine, pulse or triangular wave to electroacoustics transducer;
One pre-amp gain controller carries out processing and amplifying with input signal;
One phase-sensitive detector (PSD) carries out phase sensitive detection to input signal and handles, and output has the signal of the two-dimensional signal of X/Y component;
One A/D converter carries out mould/number conversion with input signal;
One computer processing system calculates, handles, analyzes input signal, and the output control signal;
The input of waveform generator is connected to computer system, and the latter exports control signal to the former makes the former produce corresponding waveform string; The output of waveform generator is connected to electroacoustics transducer and phase-sensitive detector (PSD) respectively, and waveform generator is to electroacoustics transducer output drive signal, to phase-sensitive detector (PSD) output comparison signal; Produce corresponding vibration after the transmitter excited target of electroacoustics transducer and to measured medium emission sound wave, the ultrasound wave of direct Contact Coupled or couplant coupling, receiver receive sound wave, ultrasound wave after by measured medium echo and the vibration of echo be converted to electric signal export to the pre-amp gain controller; The output of pre-amp gain controller is connected to the input of phase-sensitive detector (PSD), exports to phase-sensitive detector (PSD) after the signal that electroacoustics transducer is defeated by is amplified; The output of phase-sensitive detector (PSD) is connected to A/D converter, and phase-sensitive detector (PSD) carries out phase sensitive detection to the output signal of pre-amp gain controller to be handled, and the signal that draws the two-dimensional signal with X/Y component is defeated by A/D converter; The output of A/D converter is connected to computer processing system, computer processing system is handled input signal, and the control signal output of computer processing system is connected to the control end of electroacoustics transducer, pre-amp gain controller, phase-sensitive detector (PSD), A/D converter respectively.
2. a kind of sound according to claim 1, Ultrasonic NDT device, it is characterized in that: described electroacoustics transducer is single sonde configuration, transmitter and receiver are contained in the probe.
3. a kind of sound according to claim 1, Ultrasonic NDT device is characterized in that: described electroacoustics transducer is two sonde configurations, and transmitter and receiver are contained in respectively in two probes.
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| CNU2007200074176U CN201051092Y (en) | 2007-06-15 | 2007-06-15 | A sound and ultrasonic no damage detection device |
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| CNU2007200074176U CN201051092Y (en) | 2007-06-15 | 2007-06-15 | A sound and ultrasonic no damage detection device |
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