The invention discloses a method for increasing air-coupled ultrasonic detection signal strength of a composite material. The method comprises the following steps: step one, placing a workpiece between a first air-coupled transducer and a second air-coupled transducer; step two, sticking two thin layers on the upper and the lower surfaces of the workpiece; step three, stimulating the first air-coupled transducer, enabling the ultrasonic waves emitted by the first air-coupled transducer to pass through upper side air, the upper side thin layer, the workpiece, and the lower side thin layer and lower side air in sequence, and reaching to the second air-coupled transducer; and step four, feeding back a signal received by the second air-coupled transducer to a computer and generating an image and data; the invention provides a method and technology for conducting impedance matching on the detected workpiece, so that ultrasonic waves reflected back and forth in the thin layers are kept in the same phase when transmitting the thin layers, so as to realize the enhanced energy transmission effect similar to the resonance and improve the detection sensitivity of a whole detection system, and thin layer materials can be recycled.

Method for increasing air-coupled ultrasonic detection signal strength of composite material

The invention relates to a transmission type air coupling ultrasonic scanning imaging method, which is completely connected used for nondestructive testing of internal defects in a to-be-detected object, and includes the following steps: 1) connection of the system, to be more specific, all parts of a detection device are through data lines, and the detection device is powered on, and started; 2) adjustment of probes, to be more specific, a to-be-detected sample is fixed on a sample platform, and is arranged between a transmitting probe and a receiving probe, the distance between the receiving probe and the surface of the to-be-detected sample is adjusted, so that the transmitting probe focus falls on the surface of the to-be-detected sample; 3) determination of the scanning scope; 4) detection of the to-be-detected sample, to be more specific, scanning software controls the scopes to automatically scan in the scanning scope, ultrasonic echo is displayed in real time, after the scanning, the transmitting probe and the receiving probe automatically return back to coordinate zero point; and 5) signal processing and analysis, to be more specific, the ultrasonic echo signal is analyzed and processed by system detection software, and a test image is displayed. Compared with the existing technology, the transmission type air coupling ultrasonic scanning imaging method has the advantages of being easy to focus, high in transmitting efficiency, strong in signal processing and analysis function and the like.

Transmission type air coupling ultrasonic scanning imaging method

The invention discloses an automatic scanning device for oil and gas pipeline phased array ultrasonic testing The automatic scanning device comprises a fixed bracket (1), an axial movement mechanism (2), a circumferential movement mechanism (3), and a probe frame (4) for clamping a phased array ultrasonic probe (5), wherein the axial movement mechanism (2) is mounted on the fixed bracket (1) and is used for controlling the scan of the axial movement of the circumferential movement mechanism (3) along a pipeline; the circumferential movement mechanism (3) is mounted on the axial movement mechanism (2) and is used for controlling the scan of the circumferential movement of the probe frame (4), arranged on the circumferential movement mechanism (3), along the pipeline Through arrangement of the axial movement mechanism and the circumferential movement mechanism, the phased array ultrasonic probe can be controlled to realize accurate automatic movement in the axial direction or circumferential direction along the outer surface of the pipeline, and a phased array ultrasonic signal can be utilized to automatically perform nondestructive inspection scan on the pipeline

Automatic scanning device for oil and gas pipeline phased array ultrasonic testing

The invention discloses an electromagnetic ultrasonic transducer for measuring thickness of a globular graphite cast tube. The electromagnetic ultrasonic transducer comprises a transducer main body and a handle, wherein one end of the handle is fixed on the transducer main body through a bolt; the transducer main body comprises a coil component and a cable locking joint; the cable locking joint is pressed on the coil component and is fixed on the transducer main body through the bolt; a cable component is fixed at the cable locking joint; and the cable component penetrates through the interior of the handle and exceeds the handle. According to the invention, a solenoid coil is in the manner of enameled wire winding, the volume is small and the signal is more sensitive and practical; an idler wheel is arranged on the transducer main body, so that the transducer is convenient to move on the cast tube with a rough surface; a soft magnetic conductive magnet is in contact with the solenoid coil, so that the magnetic conductivity can be increased, the eddy current loss of the coil can be reduced and the signal sensitivity can be promoted; and the electromagnetic ultrasonic transducer has the advantages of simple design and structure, convenience in operation, no pollution, no harm to the human body, low running cost, no resource waste and capability of running at high temperature.

Electromagnetic ultrasonic transducer for measuring thickness of globular graphite cast tube

The invention discloses a device for detecting interface ultrasonic imaging of a laminar metallic composite.The device comprises a computer and a water tank.A support for containing the laminar metallic composite is arranged in the water tank.The laminar metallic composite is composed of a base plate and a compound plate.A computer is connected with a data collecting card and a motion control card.The data collecting card is connected with an ultrasonic pulse receiving generator, and the ultrasonic pulse receiving generator is connected with a water-logging ultrasonic probe.A motion frame is arranged at the top of the water tank.The water-logging ultrasonic probe is suspended on the motion frame and can be driven by a second motor to transversely move along the water tank.The water-logging ultrasonic probe is located above the laminar metallic composite, and a first motor and the second motor are both connected with the motion control card.The invention further discloses a method for detecting interface ultrasonic imaging of the laminar metallic composite.The device and method are novel and reasonable in design, convenient to achieve, convenient and fast to use and operate, high in detection precision, high in practicality, wide in application range, good in use effect and convenient to use and popularize.

Device and method for detecting interface ultrasonic imaging of laminar metallic composite

The invention discloses an air coupling ultrasonic automatic detection system which comprises a computer module, an industrial control host and a scanning system, wherein the computer module receives and transmits a control instruction to the industrial control host; the industrial control host controls the scanning system to run. The air coupling ultrasonic automatic detection system further comprises an adapting system, wherein the industrial control host is used for matching different probes in the scanning system by virtue of the adapting system. The air coupling ultrasonic automatic detection system disclosed by the invention can be used for rapidly and conveniently detecting a sound high-loss material contactlessly without using water as a coupling system, and is especially effective for detecting carbon fibers, a glass fiber composite material and the like. All control instructions of the air coupling ultrasonic automatic detection system are sent by virtue of upper computer software, so that the air coupling ultrasonic automatic detection system is convenient to operate and realizes automatic control; the air coupling ultrasonic automatic detection system is modularized, is convenient to dismantle and maintain; the adapting system is used for accurately matching different probes so that the probes can be replaced as required, and thus the universality of the air coupling ultrasonic automatic detection system is improved.

Air coupling ultrasonic automatic detection system

The invention discloses an electromagnetic ultrasonic transducer of an end portion-free detection blind area The electromagnetic ultrasonic transducer comprises a magnetic upper shell and a non-magnetic lower shell, and a traction handle used for holding and operating; the lower shell is provided with a high frequency coil and two permanent magnets with a same magnetic pole direction, the two permanent magnets respectively have a sector-shaped structure with wide top and narrow bottom, the high frequency coil gets around the lower side of one of the permanent magnets to form an excitation end; the upper shell fits with the upper portion of the lower shell to make the two permanent magnets be adsorbed on the upper shell in a mutual parallel manner; and two sides of the lower portion of the lower shell are symmetrically provided with a plurality of rigid wheels The electromagnetic ultrasonic transducer of the end portion-free detection blind area, adopting the above design, has the advantages of increasing of the intensity and the signal to noise ratio of a magnetic field and a signal, convenient use and operate, realization of convenient replacement of the coil, protection of the coil from being damaged, elimination of the detection blind area, and effective protection of the surface of a workpiece

Electromagnetic ultrasonic transducer of end portion-free detection blind area

The utility model discloses a box type automatic scanner applied to electromagnetic ultrasonic flaw detection, and relates to the technical field of non-destructive detection The box type automatic scanner comprises two probe assemblies of a same structure and a driving box body, wherein two adjusting devices of a same structure are arranged on the driving box body; the adjusting device comprises sliding tracks with waist-shaped grooves, sliding bases, connecting arms and locking pins; the sliding tracks are connected with the driving box body; the sliding bases are connected with the sliding tracks through bolts inside the waist-shaped grooves in the sliding tracks; one end of each connecting arm is connected with each sliding base through a hinge; the other end of each connecting arm is connected with the probe assembly; the locking pins are arranged on the sliding bases By additionally arranging the adjusting devices on both sides of the driving box body, a scanner probe assembly can stably receive signals, meanwhile, the probe assemblies can be fixed above two sides of the driving box body through the locking pins, and thus the security of the probe assemblies when the scanner is moved is effectively ensured

Box type automatic scanner applied to electromagnetic ultrasonic flaw detection

The invention discloses a box type automatic scanning device applied to electromagnetic ultrasonic flaw detection, and relates to the technical field of nondestructive testing. The box type automatic scanning device comprises two probe assemblies with same structures and a driving box body, wherein the driving box body is provided with two adjusting devices with same structures; each adjusting structure comprises a slide rail with a kidney-shaped groove, a slide seat, a connection arm and a locking pin; the slide seats are connected with the driving box body; the slide seats are connected with the slide rails by bolts in the kidney-shaped grooves in the slide rails; one ends of the connection arms are connected with the slide seats by hinges; the other ends of the connection arms are connected with the probe assemblies, and the locking pins are arranged on the slide seats. According to the box type automatic scanning device applied to the electromagnetic ultrasonic flaw detection, the adjusting devices are additionally arranged at the two sides of the driving box body so that the probe assemblies of the scanning device can stably receive signals; meanwhile, the locking pins can be used for fixing the probe assemblies above the two sides of the driving box body, so that the safety of the probe assemblies is effectively guaranteed when the scanning device is transported.

Box type automatic scanning device applied to electromagnetic ultrasonic flaw detection

The invention discloses an air-coupled ultrasonic interferometry method. The method includes the following steps of: taking an air-coupled ultrasonic transducer as a measuring head to face the surfaceof a workpiece, reflecting ultrasonic waves back and forth on the surface of the workpiece, and measuring the phase difference that the first-time reflection echo on the surface of the workpiece reaches the air-coupled ultrasonic transducer; and based on the change of the frequency and wavelength of the ultrasonic waves, converting the measurement of the distance into the change rate of the phaseof acoustic waves relative to the angular frequency of the acoustic waves, wherein the change of the angular frequency of the acoustic waves is equal to the difference between the highest frequency F2 and the lowest frequency F1 in the bandwidth fB of the air-coupled ultrasonic transducer multiplied by 2Pi; and the change of the phase of the acoustic waves is equal to the difference between the integral multiples obtained by dividing the sound path by the wavelength at the frequency F2 and the frequency F1 multiplied by 2Pi. The ultrasonic technology is based on long-term continuous emissionand large-span frequency scanning, and has the advantages of high measurement accuracy and strong anti-interference ability; and the corresponding technology of the ultrasonic technology in laser interference is relatively difficult to achieve.

Zhou Xinzong

Papers

Air coupling ultrasonic automatic detection system

Electromagnetic ultrasonic transducer of end portion-free detection blind area

Box type automatic scanner applied to electromagnetic ultrasonic flaw detection

Box type automatic scanning device applied to electromagnetic ultrasonic flaw detection

Air-coupled ultrasonic interferometry method