Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/04—Analysing solids
  • G01N29/043—Analysing solids in the interior, e.g. by shear waves
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
  • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
  • G01H9/008—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means by using ultrasonic waves
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/04—Analysing solids
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/04—Analysing solids
  • G01N29/048—Marking the faulty objects
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/04—Analysing solids
  • G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
  • G01N29/0609—Display arrangements, e.g. colour displays
  • G01N29/0645—Display representation or displayed parameters, e.g. A-, B- or C-Scan
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/04—Analysing solids
  • G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
  • G01N29/0654—Imaging
  • G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/04—Analysing solids
  • G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/22—Details, e.g. general constructional or apparatus details
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/22—Details, e.g. general constructional or apparatus details
  • G01N29/221—Arrangements for directing or focusing the acoustical waves
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/22—Details, e.g. general constructional or apparatus details
  • G01N29/225—Supports, positioning or alignment in moving situation
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/22—Details, e.g. general constructional or apparatus details
  • G01N29/24—Probes
  • G01N29/2418—Probes using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/22—Details, e.g. general constructional or apparatus details
  • G01N29/24—Probes
  • G01N29/2437—Piezoelectric probes
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/22—Details, e.g. general constructional or apparatus details
  • G01N29/24—Probes
  • G01N29/2462—Probes with waveguides, e.g. SAW devices
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/22—Details, e.g. general constructional or apparatus details
  • G01N29/24—Probes
  • G01N29/2487—Directing probes, e.g. angle probes
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/22—Details, e.g. general constructional or apparatus details
  • G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
  • G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/22—Details, e.g. general constructional or apparatus details
  • G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
  • G01N29/341—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics
  • G01N29/343—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics pulse waves, e.g. particular sequence of pulses, bursts
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
  • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
  • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
  • G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2291/00—Indexing codes associated with group G01N29/00
  • G01N2291/04—Wave modes and trajectories
  • G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2291/00—Indexing codes associated with group G01N29/00
  • G01N2291/10—Number of transducers
  • G01N2291/102—Number of transducers one emitter, one receiver
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2291/00—Indexing codes associated with group G01N29/00
  • G01N2291/26—Scanned objects
  • G01N2291/263—Surfaces
  • G01N2291/2632—Surfaces flat

Definitions

• the invention relates to a method for the non-destructive checking of materials, specifically to a non-destructive method for checking solid materials as well as solid laminates and, to the device for implementing this.
• a device for checking the mechanical properties of a material under load, which comprises a pulsed laser which is connected to an optical-acoustic transducer by optical fiber, as well as piezoelectric pulse receivers connected to an A/D converter connected to a PC where one piezoelectric receiver is located between the optical-acoustic transducer and the object to be tested, and the other is located on the opposite side of the object to be tested.
• the drawback of this device is the need to access the object to be tested from both sides.
• this device cannot be used because on the panels’ underside there is an anchoring system, a power collecting device with its controls, and if the panels are mounted on the roofs of buildings, access to their internal structure from behind is not possible without completely dismantling them.
• a method for determining the physical-mechanical characteristics of polymer composite materials as well as equipment for its implementation is that flexible oscillations are induced on the surface of the object being checked by means of a transducer. These oscillations cross the object and their reflected echo signals are received on the same surface. According to the parameters of the received signal, the porosity, density and mechanical properties of the material of the product being monitored are then determined.
• This method makes it possible to detect the hidden defects of largesized objects with a complex structure under conditions of limited access to these objects.
• measuring the characteristics of a material according to the noise components of a backward- scattered audio signal only allows their integral characteristics to be established without providing information about the size of the defect and the depth at which it is located.
• the object of the present invention is to construct a device and devise a non-destructive material inspection method that allows simple, one-sided and highly accurate non-destructive checking of the internal structures of solid materials.
• the source of laser impulses makes at least one laser impulse, which is fed into the expansion lens head by means of an optical cable, inside which the laser impulse is arranged in the form of a beam of light which enters the upper side of the transparent optical cylinder and is directed to the bottom side of the transparent optical cylinder opposite which is mounted, on the upper side of the transparent optical cylinder, an ultrasonic signal receiver, the light beam then subsequently enters the surface layer of the material being tested which absorbs it, producing at least two directionally different ultrasound impulses which spread on opposite sides, with this at least one of the initial ultrasonic impulses spreading back into the transparent optical cylinder and being received by the ultrasonic signal receiver, with this first ultrasonic impulse being taken as a reference, and at least one
• the advantage of the above-mentioned method is that it allows for simple testing of the state of the internal structures of materials, particularly of materials having a heterogeneous structure that intensely absorb light rays, while allowing testing of high accuracy and reliability to detect hidden defects even under conditions of restricted access to the object being monitored. It is to advantage that very short ultrasonic impulses occurring in the heterogeneous environment of the surface layer of the object being monitored have, from the view of time, a repeating time curve of the laser impulse intensity which only changes when the original laser impulse is changed.
• a change in transverse spreading is achieved by regulating the cross-section of the beam of ultrasonic impulses, given by the waveguide height and by increasing the longitudinal resolution through increasing the signal/noise ratio while simultaneously increasing the number of impulses from which is determined the average value of laser work in the periodic impulse transmission mode.
• a further advantage is that due to the ability of the material on the surface layer of the material to be tested to generate ultrasonic impulses due to the absorption of laser radiation and to consequent unstable thermal expansion, the portion of the material covered by a wide spot of light, formed on the surface layer, the incident beam of light beam becomes the radiation emitter. Thereby, in the given area, two ultrasonic impulses are produced, which spread on opposite sides, as described above.
• the first ultrasonic impulse is spread backward into the transparent optical cylinder in a direction along its axis.
• the first ultrasonic impulse and the group of reflected ultrasonic impulses received by the ultrasonic impulse receiver are converted to digital format and subsequently sent to an evaluation device which is run using evaluation software, with respect to the length of the time delay (P) between the first ultrasonic impulse and individual impulses of the reflected ultrasonic impulse group, and based on the phase and amplitude of each of the reflected ultrasonic impulses, the dimensions and locations of the individual inhomogeneities that are in the material structure are determined.
• P time delay
• the advantage is that this makes it possible to construct a structurally simple and highly precise device for applying this method. It follows from the above that only the part of the reflected signals that pass through the central part of the optical cylinder is taken into account, and therefore the ultrasonic impulse receiver is aligned in a single axis with the area of ultrasonic impulses, most preferably perpendicular to the surface of the object to be monitored.
• the transparent optical cylinder moves along the surface of the material to be tested. This allows a gradual check of all parts of the internal structure of the object to be checked.
• a device for the non-destructive checking of materials in particular by a device for the non-destructive checking of the internal structures of a material and the detection of their defects, for carrying out the above- mentioned method of non-destructive testing of materials, which, according to the invention, comprises a transparent optical cylinder which is arranged on the underside of the surface of the material to be tested, and on the upper side of the transparent optical cylinder a head is arranged comprising an expansion lens and is connected to a laser impulse source, where at the upper side of the transparent optical cylinder there is likewise an ultrasonic impulse receiver equipped with an evaluating device, the ultrasonic impulse receiver having a diameter which is identical to the diameter of the beam of light
• the ultrasonic impulse receiver is arranged on the axis at the lower side of the transparent optical cylinder to intersect with the axis of the beam of light emanating from the head.
• the ultrasonic impulse receiver has a diameter identical to the diameter of the beam of light rays emanating from the head at the point where they pass through the lower part of the transparent optical cylinder. This again simplifies construction and improves results of the checking.
• the head is arranged on a flat surface and set obliquely to the plane of the upper side of the transparent optical cylinder.
• the tilt of the flat surface is selected with respect to the height of the transparent optical cylinder so that the band of light impulses is best directed to the axis of the bottom side of the transparent optical cylinder.
• the ultrasonic impulse receiver is a piezoelectric signal receiver with a wide bandwidth of 300 kHz-30 MHz.
• the ultrasonic impulse receiver is connected to a preamplifier which is connected to an A/D converter that is connected to the evaluation device.
• the transparent optical cylinder is made of a material with a low ultrasonic attenuation coefficient ranging from 0.01 cm '1 to 0.1 cm 1 .
• the transparent optical cylinder is attached to a support for movable touch fit to the surface of the material to be tested. The advantage is the possibility to secure an exact position while checking the entire material to be tested.
• the transparent optical cylinder is housed in a sleeve which is movably mounted on a transverse guide bar which is movable on an upper guide bar and a lower guide bar.
• the sleeve is connected to a drive, which is an electric motor with a rack gear mechanism.
• a drive which is an electric motor with a rack gear mechanism.
• the transparent optical cylinder is mounted perpendicularly on its lower side to the surface layer of the material to be checked. This ensures the highest possible accuracy of the testing results in regard to the simplicity of the design of the entire device.
• the ultrasonic signal receiver is arranged exactly at the centre of the top of the transparent optical cylinder. Again, this is advantageous in terms of the simplicity of the overall design.
• the main advantage of the method and design of the device according to the invention is that it allows simple checking of the state of the inner structure of materials, while simultaneously highly accurately determining the location and size of inhomogeneities, which essentially means highly precise determination of material defects and their locations.
• Fig. 1 shows a front schematic view of the overall arrangement of a non-destructive material checking device, including graphical indication of functional linkages
• Fig. 2 is a side schematic view of a transparent optical cylinder mounted in a support frame and its attachment to the material to be tested. Examples of the Performance of the Invention
• a series of individual laser impulses is created, which are routed through the optical cable to the head 2 with the expansion lens.
• the intensity of the radiation and the duration of the laser impulse are selected in such a way that the amplitude of the pressure and the frequency range of the ultrasonic impulse allows complete passage through the object to be checked with the necessary resolution.
• the pulse length for semiconductors and metals is determined in such a way that the absorbing layer thickness is not more than 100 nm, and the impulse frequency is determined within a range of 10 Hz to 10 kHz according to the required scanning speed for the material to be checked.
• the laser impulses are arranged in the form of beams 6 of light, which enters into the upper side 31 of the transparent optical cylinder 3, so that they are directed to the lower side 32 of the transparent optical cylinder 3 provided with an ultrasonic signal receiver 12 , where the beams 6 of light subsequently enter the surface layer 7 of the material 8 to be checked which absorbs them, where each always produce two directionally different ultrasonic impulses 11 13 which spread to the opposite sides thereof in such a way that the first ultrasonic impulse ⁇ spreads backward to the transparent optical cylinder 3 in a direction along its axis 10, and is received by the ultrasonic signal receiver 12, this first ultrasonic impulse H being taken as a reference, and the second ultrasonic impulse 13 is spread to the material 8 to be checked, the second ultrasonic impulse 13 as it travels back and forth after being reflected from its lower surface 16, with the material 8 to be checked scattering by its inhomogeneity 26 which may be border 14 of a layer and/or surface 15 of the defects, thus giving
• the first ultrasonic impulse JM and the reflected ultrasonic impulse group 17 received by the ultrasonic impulse receiver 12 are converted to digital format and subsequently sent to the evaluation device 29, which runs using evaluation software (SW), with respect to the time delay (P) between the first ultrasonic impulse 11 and the individual impulses of the group 17 of reflected ultrasonic impulses, and on the phases and amplitude of the individual reflected ultrasonic impulses, the dimensions and locations of the individual inhomogeneities 26 that are in the structure of the material 8 are determined.
• SW evaluation software
• the evaluation device 29 is a computer in which further analyses are performed.
• the bands 6 of light beams form on the surface 7 of the material 8 to be checked spots 9 of light, which have the same diameter as the diameter of the ultrasonic impulse receiver 12, while the ultrasonic impulse receiver 12 and the spots 9 of light have the same axis.
• the transparent optical cylinder 3 is continuously moved over the surface of the material 8_to be checked.
• the spot 9 of light and the receiver 12 have the same diameter and the location and boundaries of the area 20 being tested are known, it is easy to determine by the position of the axis 10 of the transparent optical cylinder 3 and the values obtained, two and three-dimensional maps of the inhomogeneity 26 of the structure of the material 8.
• the dimensions and locations of the individual inhomogeneities 26 of the structure of the material 8 are subsequently displayed on the screen in the form of two and three dimensional maps.
• the surface layer 7 of the material 8 to be checked is provided with a layer of gel.
• the device for the non-destructive checking of a material 8 and the detection of its defects comprises a transparent optical cylinder 3, with its bottom side 32 arranged on the surface layer 7 of the material 8 to be tested, while on the upper side 31 of the transparent optical cylinder 3 is arranged and a head 2 which comprises an expansion lens and which is connected to the laser impulse source 5, while on the upper side 31 of the transparent optical cylinder 3 is simultaneously arranged an ultrasonic impulse receiver 12 connected by an electrical cable 18 to the evaluation device 29.
• the ultrasonic pulse receiver 12 is arranged on an axis which, at the bottom side 32 of the transparent optical cylinder 3, intersects with the axis 28 of the beam 6 of light emanating from the head 2
• the ultrasonic impulse receiver 12 has a diameter that is identical to the diameter of the beam 6 of light emanating from the head 2 at the place where they pass through the bottom side 32 of the transparent optical cylinder 3.
• the head 2 is arranged on the plate 4 set obliquely to the plane 27 of the upper side 31_ of the transparent optical cylinder 3.
• the ultrasonic impulse receiver 12 is a piezoelectric receiver with a wide bandwidth of 300 kHz-30 MHz.
• the ultrasonic impulse receiver 12 is connected to a preamplifier which is connected to an A/D converter that is connected to the evaluation device 29.
• the transparent optical cylinder 3 is made of a material with a low ultrasonic impulse attenuation coefficient of 0.05 cm 1 .
• the transparent optical cylinder 3 (Fig. 2) is, to the movable touch fit on the surface layer 7 of the material 8 to be checked, attached to the support 19.
• the transparent optical cylinder 3 is housed in the sleeve 21 and secured by a means of fixation 22.
• the sleeve 21 is movably mounted on a transverse guide bar 25 which is movable on the upper guide bar 23 and the lower guide bar 24.
• the sleeve 21 is connected to a drive 30 which is an electric motor with a rack gear mechanism.
• the transparent optical cylinder 3 is arranged with its lower side 32 perpendicular to the surface layer 7 of the material 8 to be checked.
• the ultrasonic signal receiver 12 is arranged exactly at the centre of the upper side 31 of the transparent optical cylinder 3.
• the device for the non-destructive checking of a material 8 operates in such a way that before the testing begins, tight contact is established between the material 8 to be tested and the transparent optical cylinder 3, and the position of the transparent optical cylinder 3 is determined in the specified coordinate system. Next, subsequent testing of the material 8 to be checked is carried out using the method described above.
• the method for the non-destructive checking of materials and the device for carrying this out according to the invention can be used for non-destructive checking of the internal structures of solid materials, and for detecting their defects, particularly for checking the internal structures of solid laminates such as solar panels.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Acoustics & Sound (AREA)
• Optics & Photonics (AREA)
• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

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• 2018
  • 2018-08-07 CZ CZ2018-397A patent/CZ2018397A3/cs unknown
• 2019
  • 2019-07-30 EP EP19761723.6A patent/EP3833972A1/en not_active Withdrawn
  • 2019-07-30 WO PCT/CZ2019/000037 patent/WO2020030202A1/en not_active Ceased

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