12 results about "Creeping wave" patented technology

The embodiment of the invention provides an ultrasonic detection test block and a detection method, the ultrasonic detection test block comprises a first base metal sub-test block and a second base metal sub-test block which are prepared from an austenite material, the first base metal sub-test block and the second base metal sub-test block are welded and fixed and form a welding joint, and the welding joint is a welding seam area between the first base metal sub-test block and the second base metal sub-test block; the first side and the second side of the ultrasonic detection test block are respectively provided with a plurality of first blind holes for longitudinal defect reference sensitivity calibration, the third side of the ultrasonic detection test block is provided with a plurality of second blind holes for transverse defect reference sensitivity calibration, and the fourth side of the ultrasonic detection test block is provided with notch groove defects for surface wave reference sensitivity, creeping wave reference sensitivity and wedge block delay calibration; and a notch groove defect for wedge block delay calibration is positioned on the first parent metal sub-test block. According to the ultrasonic detection test block disclosed by the embodiment of the invention, through improvement of the test block, calibration of various detection methods can be met, the interior of a welding seam and a primary longitudinal wave detection surface blind area can be covered, the detection coverage rate of a single method is increased, and the reliability of a detection result is improved.

The invention discloses a creeping wave detection device for defects of the inner wall of a thick-wall pipe, and relates to the field of ultrasonic creeping wave detection equipment, the creeping wave detection device comprises a driving transmission seat and a motor seat arranged at the rear end of the driving transmission seat, a driving motor is arranged in the motor seat, and the left side and the right side of the driving transmission seat are connected with driving wheels through driving shafts; the self-cleaning detection anti-interference device is additionally arranged for the phased array creeping wave detection probe, the anti-interference transparent protective cover wraps the probe, contact of dirt such as oil dirt and rust in a pipeline is blocked, array element pollution and element damage are avoided, attenuation of a high-light-transmission material is small, and the anti-interference device has the advantages of being simple in structure, low in cost and high in reliability. A wind power self-cleaning mechanism of the device forms an annular airflow forward along a protective cover through a wind distribution ring and a wind spraying head, dripped dirt is blown away in time, a super-hydrophobic coating is matched for dual oil stain prevention, a filter cover is matched for preventing secondary pollution of air impurities, and the protection continuity is improved.

The present invention relates to the field of ultrasonic creeping wave detection technology, and in particular to a method, system, equipment and medium for detecting the front and delay of an ultrasonic creeping wave probe, including: driving the creeping wave probe to move to the highest reflected wave height of two transverse through holes of a special comparison test block respectively, measuring the horizontal distance between the front end of the creeping wave probe and the two transverse through holes to obtain the front of the creeping wave probe; driving the creeping wave probe to move to a position where the horizontal distance from the wire cutting groove is the first cutting distance, adjusting the gain of the ultrasonic flaw detector and the delay value of the ultrasonic flaw detector to obtain the delay value of the creeping wave probe; performing creeping wave detection according to the front and delay values ​​of the creeping wave probe to determine the defect location. The present invention uses a special comparison test block to complete creeping wave detection, which solves the problem that the existing creeping wave detection method can not only rely on the manufacturing process of the manufacturer to ensure the performance of the creeping wave probe, but also cannot achieve accurate, fast and efficient identification and positioning of defects, and has the advantages of convenient operation and high detection efficiency.

The application relates to a method for detecting a lower base material crack of a roof-penetrating sleeve corner weld of a boiler heating surface, which comprises the following steps: a creeping wave probe is attached to a heating surface tube base material with a roof-penetrating sleeve, and a creeping wave signal is sent to the heating surface tube base material; wherein the creeping wave probe is located on one side of the heating surface tube base material close to a weld; and according to a creeping wave reflection signal received by the creeping wave probe, the outer wall crack of the heating surface tube base material with the roof-penetrating sleeve is detected. Compared with the prior art, the application can avoid the problems of crack mis-detection and missed detection caused by the excessively complex structure of a welding position, improves the accuracy of the roof-penetrating position heating surface tube crack detection result, is favorable for guaranteeing the normal operation of a power station boiler, and meets the actual application requirements.

The present invention relates to the technical field of weld inspection, and particularly to a method for ultrasonic phased array inspection of welds. First, the weld is divided into a surface weld, a middle-layer weld, and an inner-layer weld arranged in sequence from outside to inside along the thickness direction of the weld; then, a single-sided double-sided detection method is adopted, and a phased array detector is used to excite creeping waves to scan the surface weld, excite transverse waves to scan the middle-layer weld, and excite longitudinal waves to scan the inner-layer weld; after that, one side of the scan data map of the surface weld is horizontally flipped and then superimposed on the other side of the scan data map of the surface weld; one side of the scan data map of the middle-layer weld is horizontally flipped and then superimposed on the other side of the scan data map of the middle-layer weld; one side of the scan data map of the inner-layer weld is horizontally flipped and then superimposed on the other side of the scan data map of the inner-layer weld; interference signals are shielded and defect signals are enhanced to achieve precise detection of internal defects of the entire weld.

The invention belongs to the technical field of nondestructive testing, and particularly relates to a nondestructive testing method and system for the early hydration strength of cement based on a sensor, and the method comprises the following steps: S1, at a plurality of preset hydration time points, transmitting a creeping wave excitation signal with a predetermined waveform to a to-be-tested cement test piece, and receiving a response signal transmitted by the cement test piece; s2, performing continuous wavelet transform on the response signal, and identifying a connected region with the maximum energy and the duration meeting a preset condition in a wavelet coefficient time-frequency matrix as a creeping wave signal packet; s3, calculating a creeping wave propagation speed according to the energy gravity center time of the creeping wave signal packet; fourier transform is carried out on the creeping wave signal packet, the center frequency is extracted, the difference value between the creeping wave signal packet and the center frequency of the creeping wave excitation signal is calculated, and the frequency offset is obtained. According to the method, the advantage information of the two parameters, namely the creeping wave propagation speed and the creeping wave attenuation index, in different stages is fully utilized, and the early hydration strength of the cement is accurately and reliably predicted.

The utility model relates to an antenna device and equipment. The antenna device comprises a dielectric body, a radiation oscillator and a surface wave suppressor. The radiation oscillator is arranged on the medium body. The surface wave suppressor is arranged on the dielectric body, the surface wave suppressor and the radiation oscillator are located on the same layer of the dielectric body, the surface wave suppressor is wound on the periphery of the radiation oscillator, and a first insulation spacer region is formed by the surface wave suppressor and the radiation oscillator. The surface wave suppressor and the radiation oscillator are located on the same layer of the dielectric body, the surface wave suppressor is wound on the periphery of the radiation oscillator, and a first insulation spacer region is formed by the surface wave suppressor and the radiation oscillator, so that the radiation oscillator and the surface wave suppressor coexist, are combined together, interact with each other and jointly participate in radiation; the problems of reflection and shielding of antenna signals by the metal film layer on the glass are solved, and the surface wave suppressor can isolate surface creeping waves, so that the radiation efficiency and isolation of the antenna are improved.

The present invention discloses an ultrasonic creeping wave combined probe and a temperature performance testing method, which includes a housing, a sound insulation board, a first receiving wafer, a first transmitting wafer, a second receiving wafer, a second transmitting wafer, a first wedge, a second wedge and an acoustic absorption material. The first receiving wafer and the first transmitting wafer are symmetrically installed on both sides of the sound insulation board. One end of the first wedge is installed with the first receiving wafer and the first transmitting wafer, and the other end of the first wedge forms an arc-shaped detection surface. The second receiving wafer and the second transmitting wafer are symmetrically installed on both sides of the sound insulation board, and the other end of the second wedge forms a flat detection surface. The first receiving wafer and the second receiving wafer are connected and installed on a receiving interface, and the first transmitting wafer and the second transmitting wafer are connected and installed on a transmitting interface. The ultrasonic creeping wave combined probe and the temperature performance testing method provided by the present invention reduce the number of probes carried, simplify the operation, and can improve the detection effect and service performance of the creeping wave probe.

The invention discloses a nondestructive testing method for detecting defects on the inner surface of a pipeline. The nondestructive testing method comprises the following steps: detecting the defects on the inner surface of the pipeline by adopting a detection method based on a secondary creeping wave, a corner reflection serial wave and a large-angle longitudinal wave detection probe; designing a detection calibration test block; comparing the detected inner surface defect with the detection calibration test block, and analyzing the defect position to obtain a signal waveform; and evaluating the defects of the inner surface of the pipeline according to the signal waveform. According to the method, corrosion / fatigue cracks and the like on the inner surface of the pipeline are effectively detected, and an important support is provided for a pipeline corrosion / fatigue crack quantitative technology.

This invention discloses a method for detecting oblique spalling cracks in rails based on ultrasonic creeping waves, belonging to the field of data processing and display technology in rail non-destructive testing. The invention proposes: initializing a one-transmitter-one-receiver mode and sound path conversion parameters based on the first critical angle; performing relative sensitivity calibration and flaw detection sensitivity benchmark compensation calibration; acquiring echo signals on-site using a combination of sawtooth and fixed-point rotation; the instrument converts the echo time difference within the gate according to preset parameters, directly displaying the horizontal distance, depth, and sound path; and determining the damage level based on a depth threshold. This invention deeply integrates the physical mechanism of creeping wave acoustic field with data processing logic, achieving effective separation and display of shallow-depth oblique crack echoes and initial pulses, as well as accurate damage conversion and positioning. It exhibits strong resistance to surface interference and significantly improves the identification and classification capabilities of early-stage micro-cracks.

The invention discloses a cross-water power transmission line SAR multi-scattering feature recognition and prediction method, and relates to the field of power transmission line synthetic aperture radar monitoring, and the method comprises the steps: obtaining an SAR image, DEM, weather and power transmission tower coordinate data of a target region; establishing a point scattering tracking model based on a power transmission line catenary configuration, and accurately positioning a secondary scattering straight line which is not influenced by elevation distortion and theoretical physical positions of drifting primary and tertiary scattering; further combining mirror reflection and creeping wave theories, analyzing a physical modulation mechanism of the water surface roughness and the track included angle on multiple scattering signals, and determining a characteristic evolution boundary; and finally, extracting a space geometric included angle and a water surface backscattering coefficient as input, and quantitatively predicting and identifying geometric shape evolution characteristics of the power transmission line in the current environment. According to the method, the problems of missing detection and misjudgment pain points caused by dynamic water surface interference in a traditional method are solved, and high-reliability physical constraint and algorithm support are provided for cross-water-area power transmission line SAR intelligent inspection.

A method and dedicated device for ultrasonic detection of microcracks in semiconductor silicon rings are disclosed, specifically comprising: selecting a piezoelectric crystal with a size of 6–10 mm and a frequency range of 1 MHz–15 MHz for a water immersion focusing ultrasonic probe; calculating the required incident angle for the ultrasonic waves to refract into transverse waves, surface waves, and creeping waves at the water / silicon interface; adjusting multiple sets of ultrasonic probes to emit ultrasonic waves at different tilt angles according to the incident angle value; the ultrasonic waves are refracted on the surface of the semiconductor silicon ring, resulting in waveform conversion; the refracted waves excited by ultrasonic waves at different incident angles in the semiconductor silicon ring propagate in the silicon wafer along a certain propagation path; when they encounter a defect, ultrasonic scattering occurs, and the reflected waves in the scattering return along the original path and are received by the ultrasonic probe; the ultrasonic probe converts the reflected wave signal into a detection electrical signal and transmits it to the ultrasonic instrument; the ultrasonic instrument uploads the result signal to an industrial control computer; the imaging software in the industrial control computer images the detection results and displays the distribution information of the microcracks in the entire semiconductor silicon wafer.