Ultrasonic measurement system and detection method for detecting deep structural fissures

An ultrasonic measurement and fracture technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, analyze materials, instruments, etc., can solve the problems of reduced spatial resolution, conflicting resolution and penetration depth, etc. Effect

Pending Publication Date: 2017-10-24
WUXI HAIYING ELECTRONICS MEDICAL SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in order to obtain a spatial resolution of 50 μm, the operating frequency of the ultrasonic measurement system must be at least 50 MHz, and such high-frequency ultrasonic waves can only penetrate very short materials, for example, the penetration depth in biological soft tissues is only 3 mm; If the operating frequency is reduced to 3.5MHz, although the penetration depth is improved, the spatial resolution is reduced to only about 200μm
Therefore, the resolution and penetration depth of traditional ultrasonic testing systems always conflict with each other

Method used

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  • Ultrasonic measurement system and detection method for detecting deep structural fissures
  • Ultrasonic measurement system and detection method for detecting deep structural fissures
  • Ultrasonic measurement system and detection method for detecting deep structural fissures

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example 1

[0107] Example 1: Use metal wires to imitate cracks. The diameters of the metal wires are 60 μm, 100 μm, 150 μm, and 200 μm. They are respectively embedded in agar to make 4 samples with a depth of about 2 cm. Using an ultrasonic transducer with a center frequency of 4.39MHz and a -6dB bandwidth of 4.4MHz, a beam of ultrasonic pulses is emitted. The ultrasonic pulses are reflected and scattered on the wire, and the echo signal is received by the transducer. Using the same system, a beam of ultrasonic pulses is transmitted to a sufficiently large metal surface and the echo signals are received. Figure 4a The power spectrum of the calibrated 150μm diameter metal wire echo signal is given, and the linear fitting is done in the 0.5-8MHz frequency band, and the slope value of the fitting line can be obtained. The inset is the corresponding time-domain signal. Figure 4b Experimental slope values ​​are given for all 4 wire sizes and compare well with theoretical values. Compared ...

example 2

[0108] Example 2: Get the diameters of 60 μm and 150 μm metal wires with a total length of about 20 cm, and cut them into sections with a length of about 1 cm, and then bury these small pieces of metal wires randomly in a certain plane of agar, The depth is about 2cm. The area occupied by the metal wire is about 2×2cm2, wherein, the left half is a 60 μm metal wire, and the right half is a 150 μm metal wire. Using an ultrasonic transducer with a center frequency of 4.39MHz and a -6dB bandwidth of 4.4MHz, a beam of ultrasonic pulses is emitted. The ultrasonic pulses are reflected and scattered on the wire, and the echo signal is received by the transducer. Place the sample horizontally on the stepper motor platform, move 2cm in the x direction and y direction with a step length of 1mm, and detect the area where the metal wire is located, and detect 400 points in total. The calibrated power spectrum of the echo signal measured at each detection position is made respectively, and...

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Abstract

The present application discloses an ultrasonic measurement system and a detection method for detecting deep structural fissures. By utilizing the detection method, the size of a deep sub-wavelength-scale linear micro-fissure of a material can be quantitatively detected. After being excited by ultrasonic pulses, the micro-fissure deep in the material can generate ultrasonic scattering and reflection; after being received by an ultrasonic transducer, ultrasonic signals pass through a signal amplifier and an analog-to-digital converter and are stored in a computer; and a power spectrum of the ultrasonic signals is obtained by computing. A spectrum parameter, namely a power spectrum slope, can be obtained by carrying out linear fitting on low-frequency bands of the power spectrum, the spectrum slope and the diameter of the micro-fissure are in one-to-one correspondence, and the diameter of the sub-wavelength micro-fissure can be quantitatively evaluated by computing the slope. Because the quantitative detection method needs a low working frequency, the method provides a non-invasive, non-ionizing, cheap and safe method for evaluating the scale of the deep micro-fissure.

Description

technical field [0001] The invention belongs to the technical field of crack detection, and in particular relates to an ultrasonic measurement system and a detection method for detecting deep structural cracks. Background technique [0002] The evaluation of micro-defects inside materials is an important link in the quality control of modern manufacturing products, such as internal fatigue cracks in metals, welding defect control, online monitoring of 3D printing quality, evaluation of debonding of multi-layer composite materials, etc. closely related. Therefore, the quantitative detection of material microcracks has important engineering value for the control of material and product quality. [0003] Ultrasonic testing is one of the most important non-destructive testing methods. Ultrasonic has the characteristics of large penetration depth and high resolution, and can provide multi-dimensional, different depth, and different scale structural and functional characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/023
Inventor 项四平陶超
Owner WUXI HAIYING ELECTRONICS MEDICAL SYST
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