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本文主要介绍超声探伤和测厚用的窄脉冲探头的研制。通过对影响探头脉冲占宽因素进行分析,并利用回波声脉冲响应和频谱分析方法作对比试验,选择出制造窄脉冲探头的压电材料、阻尼块和保护膜,有效地降低了探头的 Q 值,制成了2.5～10MHz的窄脉冲探头。这种窄脉冲探头配合宽频带探伤仪使用,不但分辨率高,而且提高对奥氏体粗晶材料的检测能力。
This article mainly introduces the development of narrow pulse probe for ultrasonic flaw detection and thickness measurement. By analyzing the factors that affect the pulse width of the probe and using the comparison between the echo acoustic pulse response and the spectral analysis method, the piezoelectric material, the damping block and the protective film for the narrow pulse probe are selected to effectively reduce the probe’s Q Value, made of 2.5 ~ 10MHz narrow pulse probe. This narrow pulse probe with broadband flaw detector, not only high resolution, but also improve the detection of austenitic coarse grain materials.