發(fā)布時間：2018-10-24 10:40

【摘要】：針對微小應(yīng)變在超聲輻射力彈性成像中檢測困難的問題,提出了一種應(yīng)變累積計算的方法。該方法在相位自相關(guān)算法檢測應(yīng)變的基礎(chǔ)上,將反映應(yīng)變的相位表示為復(fù)數(shù)輻角,利用復(fù)數(shù)相乘時輻角相加的原理對應(yīng)變進行累積。使用該方法對彈性模型受超聲輻射力激勵前后的信號進行應(yīng)變檢測,得到了模型的應(yīng)變曲線,并最終形成彈性圖像。實驗結(jié)果與使用傳統(tǒng)自相關(guān)算法相比,提高了微小應(yīng)變的檢測精度,有更好的信號平滑效果。
[Abstract]:Aiming at the difficulty of detecting micro strain in ultrasonic force elastic imaging, a method of strain accumulation calculation is proposed. Based on the detection of strain by phase autocorrelation method, the phase reflecting strain is expressed as complex amplitude angle, and the strain is accumulated by the principle of additive of amplitude angle when multiplying the complex number. This method is used to detect the strain of the elastic model before and after being excited by ultrasonic radiation. The strain curve of the model is obtained and the elastic image is finally formed. Compared with the traditional autocorrelation algorithm, the experimental results improve the precision of micro-strain detection and have better signal smoothing effect.
【作者單位】： 四川大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(30970781;81301286) 四川省科技支撐計劃資助項目(2014GZ0005)
【分類號】：TN911.7

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1 柳用;基于彈性成像的回聲處理和傳輸電路[D];華南理工大學(xué);2012年

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本文編號：2291154