| 戴宇翔,阎守国,张碧星.固体中线性相控阵列的瞬态聚焦特性*[J].,2022,41(1):143-150 |
| 固体中线性相控阵列的瞬态聚焦特性* |
| The transient beam focusing characteristics of linear phased arrays in solid |
| 投稿时间：2021-02-27 修订日期：2022-01-04 |
| 中文摘要: |
| 针对线性相控阵列在固体介质中的声场聚焦特性及参数优化问题，给出了一个线性阵列的纵波瞬态聚焦声场模型。数值模拟的结果表明，当阵元被短时脉冲信号激励时，瞬态聚焦声场中不会形成栅瓣；同时由于横、纵波在聚焦区域内可完全分离，声束旁瓣的幅值也得到了抑制；并且，增大阵元间距能够显著提高聚焦性能，突破了传统稳态理论模型下对阵元间距的限制。但过大的阵元间距会导致聚焦声场能量减弱，综合考虑后，最佳的阵元间距为一个波长左右。最后，采用不同阵元间距的相控阵探头对标准试块进行成像实验，可以观察到大阵元间距可以显著改善缺陷成像分辨率，从而验证了理论分析的结果。 |
| 英文摘要: |
| Aiming at the beam focusing characteristics and parameter optimization of linear phased array in solid, the model of transient beam focusing of compressional waves for linear arrays is developed. The numerical results show that when the elements are excited by short pulses, it is hard to form the grating lobes in the field. And the short pulses also makes the compressional and shear waves completely separated at the focal point, which reduces the side lobe amplitude effectively. Besides, the enlargement of inter-element spacing can effectively improve beam focusing performance, which liberates the inter-element spacing limited in the traditional study. But focusing energy tends to decrease as the inter-element spacing increases. With comprehensive consideration, the inter-element spacing approaching one wavelength is an optimal choice. Finally, the arrays with different inter-element spacing are employed to perform the imaging experiments for the standard test block. It can be observed that the larger inter-element spacing can improve the imaging resolution for defects, which verifies the results of theoretical analysis. |
| DOI：10.11684/j.issn.1000-310X.2022.01.017 |
| 中文关键词: 相控阵 超声成像 瞬态聚焦 |
| 英文关键词: phased array ultrasonic imaging transient focusing |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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