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| Study on Acoustic Reflection Characteristics and Detection Application of Line Focusing Probe |
| DUAN Jiangang, XIONG Ying |
| AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110043, China |
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Abstract The line focusing probes with focal lengths of 25mm, 35mm, 45mm and 50mm were selected, φ 1.5mm steel bar was used as reflector, by changing the relationship of position between the probe and the steel bar, the acoustic reflection characteristics of the line focusing probe in water were measured, and the detectable diameter range of the bar with different focal length was obtained; A line focusing probe with a focal length of 45mm was selected, φ 47 GH4169 superalloy bar sample was tested under different water distances, and the position of flat bottom hole used to determine the detection sensitivity of bar was obtained; φ 18 TC4 bar sample and the line focusing probes with focal lengths of 25mm, 35mm, 45mm and 50mm were selected, the experiments to characterize the reciprocating transmission of sound wave and directivity of sound beam were carried out, the selection method of water distance corresponding to the highest reflected wave amplitude of flat bottom hole used to determine the detection sensitivity of bar was obtained; The line focusing probes with focal lengths of 25mm, 35mm, 45mm and 50mm were selected, TC4 titanium alloy bar samples with different diameters were tested, the diameter range of detectable bar with line focusing probes of different focal length was verified. The measurement and characterization of acoustic reflection characteristics of line focusing probe and its application in bar inspection were solved.
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2021, 
