本文選題：頻域 + 數(shù)字散斑相關(guān)法��； 參考：《中國(guó)民航大學(xué)》2016年碩士論文

【摘要】：數(shù)字散斑相關(guān)技術(shù)是近年來(lái)發(fā)展起來(lái)的一種高精度的物體面內(nèi)位移或形變的測(cè)量方法。該技術(shù)與其他光學(xué)測(cè)量技術(shù)相比,其光路更簡(jiǎn)單、全場(chǎng)范圍的非接觸測(cè)量以及沒(méi)有干涉條紋處理環(huán)節(jié)等。因此在理論研究和實(shí)際工程中都有廣泛的應(yīng)用前景。基于頻域的散斑相關(guān)法是數(shù)字散斑相關(guān)技術(shù)的一個(gè)重要分支,該方法彌補(bǔ)了傳統(tǒng)數(shù)字散斑相關(guān)法實(shí)時(shí)性較低的問(wèn)題,但另一方面由于其測(cè)量精度較低,無(wú)法滿足目前實(shí)際工程對(duì)精度的需求。針對(duì)這一問(wèn)題,本文對(duì)頻域數(shù)字散斑相關(guān)進(jìn)行了系統(tǒng)的研究,為了提高測(cè)量精度,提出了一種基于分形插值的頻域數(shù)字散斑相關(guān)測(cè)量方法。在頻域散斑相關(guān)法的基礎(chǔ)上引入了Hanning窗函數(shù)進(jìn)行濾波以及采用分形插值法使峰值定位更加精確,同時(shí)還對(duì)比了范德?tīng)?盧格特相關(guān)器和聯(lián)合變換相關(guān)器的輸出結(jié)果,確定選用前者進(jìn)行頻域散斑相關(guān)法的匹配濾波實(shí)驗(yàn)。最后通過(guò)剛體平移實(shí)驗(yàn)對(duì)其測(cè)量精度進(jìn)行評(píng)估,結(jié)果證明了該方法的可靠性。通過(guò)實(shí)驗(yàn)結(jié)果表明,上述方法在測(cè)量物體全場(chǎng)有連續(xù)的形變時(shí),對(duì)環(huán)境要求低、測(cè)量精度高且實(shí)時(shí)性較強(qiáng)。在研究不連續(xù)形變時(shí),本文提出了一種基于頻域與空域相結(jié)合的數(shù)字散斑相關(guān)位移測(cè)量法。采用頻域相位相關(guān)法求解整像素位移信息,然后將該信息作為反向組合高斯牛頓法的初始估計(jì)并進(jìn)行亞像素位移求解。該方法通過(guò)頻域法來(lái)計(jì)算子區(qū)圖像興趣點(diǎn)的位移和形變信息,避免了傳統(tǒng)數(shù)字散斑相關(guān)在求解初值時(shí)逐行逐列的搜索。經(jīng)實(shí)驗(yàn)驗(yàn)證,該方法與牛頓迭代法相比具有更高的精確度和更快的計(jì)算速度。
[Abstract]:Digital speckle correlation (DSPR) is a highly accurate measurement method for in-plane displacement or deformation of objects. Compared with other optical measurement techniques, this technique has simpler optical path, full field non-contact measurement and no interference fringes processing. Therefore, it has a wide application prospect in both theoretical research and practical engineering. Speckle correlation method based on frequency domain is an important branch of digital speckle correlation technology. This method makes up for the low real-time performance of traditional digital speckle correlation method, but on the other hand, because of its low measurement accuracy, Can not meet the actual engineering accuracy requirements. In order to improve the measurement accuracy, a frequency domain digital speckle correlation measurement method based on fractal interpolation is proposed. Based on the frequency-domain speckle correlation method, the Hanning window function is introduced to filter and the fractal interpolation method is used to make the peak location more accurate. At the same time, the output results of the van der Lugt correlator and the joint transform correlator are compared. The former is selected for the matched filtering experiment of speckle correlation in frequency domain. Finally, the accuracy of the method is evaluated by the rigid body translation experiment, and the reliability of the method is proved. The experimental results show that the method has the advantages of low environmental requirements, high accuracy and high real-time performance when there is a continuous deformation in the whole field of the object. In this paper, a digital speckle correlation displacement measurement method based on frequency domain and spatial domain is proposed to study discontinuous deformation. The frequency domain phase correlation method is used to solve the whole pixel displacement information, and then the information is used as the initial estimation of the inverse combination Gao Si Newton method and the subpixel displacement is solved. The frequency domain method is used to calculate the displacement and deformation information of the subregion image interest points, which avoids the traditional digital speckle correlation search line by line when solving the initial values. Experimental results show that this method has higher accuracy and faster calculation speed than Newton iterative method.
【學(xué)位授予單位】：中國(guó)民航大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP391.41

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