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Ultrasonic angled probe structure and diffusion angle design
Release time:
2025-03-12 09:39
Probe Structure
The angled probe consists of a crystal, delay block, damping, and housing. See the diagram below for details.
Angled Probe Structure
Definition of Angled Probe Divergence Angle
When the sound wave is a point source, it radiates in all directions. If the size of the sound source (probe) is larger than the wavelength, the sound wave concentrates into a beam from the source and spreads out at a certain angle. The sound pressure (or intensity) is maximum on the central axis of the sound source (probe). When deviating from the central axis by an angle, the sound pressure decreases, forming the main lobe (main beam) of the sound wave. Near the sound source, the sound pressure alternately appears at maximum and minimum points, forming the side lobes of the sound wave.
Measurement of Angled Probe Divergence Angle
1. Measurement of Straight Probe (Longitudinal Wave)
Place the transmitting probe on the surface of the rectangular workpiece, radiate sound waves, and move the receiving probe at the bottom of the workpiece. The amount of sound wave energy received at different positions (the height of the reflected wave) is used to plot its diffusion characteristics.
2. Measurement of Angled Probe (Shear Wave)
Place the transmitting angled probe at the center of the semicircular workpiece (the incident wave intersects the center, i.e., the incident point). Move the straight probe on the arc surface and record the sound wave energy received at different angles to plot the divergence angle of the shear wave and the energy distribution of the angled probe. The specific measurement is shown in the diagram below.
Influence of Angled Probe Divergence Angle on Flaw Detection
The size of the divergence angle has a great influence on actual flaw detection. In general, the smaller the divergence angle, the narrower the sound beam, and the better the directivity. This can improve the resolution of defects and accurately determine the location of defects. However, when detecting workpieces with complex shapes, a larger divergence angle is sometimes desired to use the diffused sound beam to detect defects in a certain area.
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