5 results about "Creeping wave" patented technology

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 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.

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.