本文關(guān)鍵詞：基于光場(chǎng)成像理論的彌散介質(zhì)光熱特性重構(gòu)　出處：《哈爾濱工業(yè)大學(xué)》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 彌散介質(zhì) 光場(chǎng)成像 多參數(shù)群重構(gòu) 廣義源項(xiàng)多流法 LSQR-SPSO混合優(yōu)化算法

【摘要】：彌散介質(zhì)廣泛存在于自然界和工業(yè)生產(chǎn)過(guò)程中,發(fā)展彌散介質(zhì)光熱參數(shù)(主要包括輻射特性參數(shù)和溫度場(chǎng))非接觸測(cè)量方法和理論,構(gòu)建具有高置信度的光熱參數(shù)基礎(chǔ)數(shù)據(jù)庫(kù),對(duì)于推動(dòng)航空航天、能源動(dòng)力、國(guó)防科技、生物醫(yī)學(xué)、冶金化工等領(lǐng)域的發(fā)展至關(guān)重要。本文基于先進(jìn)的光場(chǎng)成像理論結(jié)合彌散介質(zhì)內(nèi)輻射傳輸正、反問題求解算法構(gòu)建基于光場(chǎng)成像技術(shù)的彌散介質(zhì)光熱參數(shù)同時(shí)重構(gòu)方法。首先系統(tǒng)地闡述了彌散介質(zhì)內(nèi)輻射傳輸機(jī)理和光場(chǎng)成像原理�？紤]光場(chǎng)成像可同時(shí)獲取多方向輻射信息的特點(diǎn)分別針對(duì)純吸收介質(zhì)和吸收、發(fā)射、散射性介質(zhì)建立基于視在光線法(LOS)和廣義源項(xiàng)多流法(GSMFM)的介質(zhì)任意方向輻射強(qiáng)度的快速精確計(jì)算方法。并進(jìn)一步結(jié)合光場(chǎng)成像原理構(gòu)建了完整的基于光場(chǎng)成像技術(shù)的彌散介質(zhì)輻射強(qiáng)度四維光場(chǎng)信息獲取的輻射傳輸過(guò)程的數(shù)值模擬方法,并采用該方法成功模擬了火焰的光場(chǎng)信息獲取過(guò)程,獲得了相應(yīng)的原始光場(chǎng)模擬圖像。針對(duì)彌散介質(zhì)輻射傳輸反問題的研究,歸納總結(jié)了目前常用的幾種求解輻射傳輸反問題的正則化方法、梯度基方法和智能優(yōu)化算法。在此基礎(chǔ)上發(fā)展了幾種改進(jìn)型算法并將其應(yīng)用于輻射傳輸逆問題的求解,證明了改進(jìn)的算法具有更高的精度、效率和穩(wěn)定性。在上述輻射傳輸正、反問題理論研究基礎(chǔ)上建立了基于最小二乘QR分解算法(LSQR)的介質(zhì)三維溫度場(chǎng)重構(gòu)方法,在介質(zhì)輻射特性參數(shù)已知條件下根據(jù)介質(zhì)邊界出射輻射強(qiáng)度分布重構(gòu)介質(zhì)三維溫度場(chǎng),并且通過(guò)大量的計(jì)算證明該重構(gòu)方法具有較高的計(jì)算精度和計(jì)算效率。同時(shí)研究了介質(zhì)輻射特性參數(shù)、溫度場(chǎng)重構(gòu)分辨率以及輻射強(qiáng)度成像分辨率對(duì)介質(zhì)溫度場(chǎng)重構(gòu)精度的影響。進(jìn)一步提出了基于LSQR-SPSO混合優(yōu)化算法的彌散介質(zhì)光熱參數(shù)同時(shí)重構(gòu)方法,根據(jù)介質(zhì)兩組不同方向上的輻射強(qiáng)度分布同時(shí)重構(gòu)出介質(zhì)的三維溫度場(chǎng)和均勻輻射特性參數(shù)(吸收系數(shù)、散射系數(shù))。大量的數(shù)值模擬計(jì)算結(jié)果表明該方法是精確有效的。同時(shí)還分析了介質(zhì)的輻射特性參數(shù)大小對(duì)于介質(zhì)光熱參數(shù)重構(gòu)精度的影響。充分利用介質(zhì)光場(chǎng)圖像中的光譜信息,結(jié)合多光譜技術(shù)優(yōu)化了基于LSQRSPSO混合優(yōu)化算法的彌散介質(zhì)光熱參數(shù)同時(shí)重構(gòu)方法,大幅度提高了介質(zhì)溫度場(chǎng)和均勻輻射特性參數(shù)的重構(gòu)精度。并進(jìn)一步考慮具有一定場(chǎng)參數(shù)優(yōu)化能力的共軛梯度法提出了基于多光譜技術(shù)和LSQR-CG混合優(yōu)化算法的彌散介質(zhì)三維溫度場(chǎng)和非均勻輻射特性參數(shù)同時(shí)重構(gòu)方法。通過(guò)大量數(shù)值模擬計(jì)算證明該方法可有效地同時(shí)重構(gòu)出介質(zhì)的非均勻光熱參數(shù)分布,并且與采用均勻輻射特性參數(shù)場(chǎng)的重建模式相比可有效提高溫度場(chǎng)的重構(gòu)精度,更適合于工程實(shí)際中彌散介質(zhì)三維溫度場(chǎng)的重構(gòu)。最后,針對(duì)乙烯擴(kuò)散火焰開展了基于光場(chǎng)成像的高溫發(fā)光火焰光熱參數(shù)重構(gòu)試驗(yàn)研究。根據(jù)單光場(chǎng)圖像分別重構(gòu)得到了乙烯擴(kuò)散火焰和摻雜Al2O3顆粒的乙烯擴(kuò)散火焰的三維溫度分布和非均勻輻射特性參數(shù)分布,并通過(guò)與熱電偶測(cè)量結(jié)果和現(xiàn)有文獻(xiàn)中結(jié)果的對(duì)比證明了本文提出的基于光場(chǎng)成像技術(shù)的彌散介質(zhì)三維溫度場(chǎng)和輻射特性參數(shù)分布重構(gòu)方法是合理可行的。
[Abstract]:The dispersion medium widely exists in nature and in the process of industrial production, the development of dispersion medium photothermal parameters (including radiation parameters and temperature field) non contact measuring method and theory, build a database on the basis of photothermal parameters with high confidence, for the promotion of aerospace, energy power, national defense science and technology development, biomedicine, metallurgy and other fields. This paper advanced light field imaging theory combined with the dispersion medium radiation transmission is based on the construction of anti problem solving algorithm and reconstruction of light field imaging technology diffusion medium photothermal parameters method based on the first systematic exposition of the dispersion medium radiation transmission mechanism and light field imaging principle. Considering the characteristics of light field imaging can simultaneously obtain the multi direction radiation information for pure absorption medium and absorption, emission, and scattering light in the visual establishment method based on (LOS) and generalized sources Multi stream method (GSMFM) fast and accurate calculation method of the medium in any direction radiation intensity. And further combined with the light field imaging principle is constructed based on light field imaging dispersion medium radiation intensity of 4D light field numerical simulation method for radiative transfer process of information acquisition, and successfully simulated the field information acquisition process of the flame by this method, the image simulation of corresponding original light field. Research on the inverse problem of dispersion medium radiation transfer, summarizes the current commonly used to solve the radiative transfer inverse problem regularization method, gradient based method and intelligent optimization algorithm. On the basis of the development of several improved algorithm which is used to solve the inverse problem of radiative transfer, it is proved that the improved algorithm has higher precision, efficiency and stability. The radiative transfer is the inverse problem theory based on the study of building The QR decomposition algorithm based on least squares (LSQR) reconstruction method of medium 3D temperature field, radiation characteristic parameters in the medium under medium boundary radiation intensity distribution of 3D temperature field reconstruction of medium, and through a lot of calculation show that the reconstruction method has higher calculation accuracy and efficiency. At the same time on the radiation characteristics of the medium parameter, temperature field reconstruction resolution and radiation intensity imaging resolution on the reconstruction accuracy of medium temperature field is discussed. We propose an LSQR-SPSO hybrid dispersion medium photothermal parameters optimization algorithm and reconstruction method based on radiation intensity distribution at the same time, according to the media two groups in different directions to reconstruct the 3D temperature field of medium and uniform radiative properties (absorption coefficient, scattering coefficient). The simulation results show that this method is accurate and effective numerical analysis. At the same time Radiation parameters influence on the medium size medium. The reconstruction accuracy of photothermal parameters to make full use of the spectral information medium light field image, combined with multi spectral technology optimization of hybrid LSQRSPSO dispersion medium photothermal parameters optimization algorithm and the reconstruction method based on, greatly improve the reconstruction accuracy of medium temperature and uniform radiation characteristic parameters and further. Consider certain field parameters optimization ability of the conjugate gradient method proposed multi spectral technology and the dispersion medium of 3D temperature field of LSQR-CG hybrid optimization algorithm and non characteristic parameters at the same time the reconstruction method of uniform radiation based on numerical simulation. Through a large number of non uniform thermal parameter distribution calculation show that the method can effectively reconstruct the medium, and the uniform radiation characteristic parameter field reconstruction model can effectively improve the reconstruction accuracy compared to the temperature field, which is more suitable for engineering The actual dispersion medium of 3D temperature field reconstruction. Finally, the ethylene diffusion flame experiment was conducted to study the thermal parameter reconstruction of flame emission light field imaging based on high temperature. Based on the single light field reconstruction images were obtained of ethylene diffusion flame and doped Al2O3 particles of ethylene diffusion flame three-dimensional temperature distribution and non-uniform radiation parameters distribution. And through the comparison with the results of the thermocouple measurement results and the existing literature in this paper proves that the light field imaging technology diffusion medium three-dimensional temperature field and radiation characteristic parameter reconstruction based method is reasonable and feasible.

【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：O439
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本文編號(hào)：1377193