基于稀土5d-4f寬帶發(fā)光的熒光應力傳感技術
發(fā)布時間：2018-09-18 14:10
【摘要】：目前熒光應力傳感方法主要包括Cr~(3+)熒光壓譜技術、應力發(fā)光與稀土熒光壓譜技術。稀土元素豐富的熒光譜線給熒光壓譜技術提供了更多的敏感材料選項。本文對這三種應力傳感技術進行了歸納比較,并指出了稀土熒光壓譜技術的獨特優(yōu)勢。力敏光譜技術通常使用譜峰頻移表征應力,但一般情況下用于應力傳感監(jiān)測信號的譜帶峰位移動極小,難以準確地檢測。本課題組的研究中設計了新的傳感信號--發(fā)射光譜譜帶的重心波長以及熒光強度比。它們都隨著壓應力的變化而單調地改變。本文研究了兩種寬帶熒光材料的應力傳感特性。采用新的傳感信號后,熒光譜帶的移動能較精確地檢測到,壓譜系數較常用的紅寶石熒光壓譜系數大了約3個數量級。實驗中采用405nm激發(fā)光源,搭建反射式測量光路,利用光纖光譜儀記錄一系列穩(wěn)態(tài)發(fā)射光譜,經過數據處理最終給出了每種傳感特征隨應力變化的傳感方程,并對其傳感性能做了簡要分析,具體結果如下:(1)YAG:Ce~(3+):壓應力導致譜帶藍移,實驗中測量的壓應力范圍0~1.59 MPa,得到譜帶重心的壓應力傳感方程為λ=572.6-0.72σ+0.22σ~2,外應力較大時局部曲線近似呈線性,靈敏度約0.3 nm/MPa,此靈敏度是已知的相應熒光粉在靜水壓環(huán)境中壓譜系數的90倍。并得到雙波長強度比(I(570nm)/I(510nm))與積分強度比(I(420nm~570nm)/I(570nm~800nm))的壓應力傳感方程分別為1)FIR=8.4-1.74σ+0.54σ~2和2)I-FIR=0.79+0.03σ-0.0092σ~2。0.5 nm分辨率的光譜儀與5.4 nm分辨率的光譜儀的測量結果表明,光譜儀分辨率對應力傳感精度沒有明顯影響。分辨率優(yōu)于0.08 MPa。(2)SrSiAlN_3:Eu~(2+):分別測試分析了熒光樣品壓應力與彎曲應力對熒光光譜的影響。1、壓應力:壓應力導致譜帶藍移,壓應力范圍0~5.83 MPa,得到譜帶重心與均值波長的壓應力傳感方程分別為1)λ=625.1-0.16σ和2)λ=630.3-0.138σ。并得到雙波長強度比(I(632nm)/I(582nm))與積分強度比(I(628nm~800nm)/I(240nm~628nm))的壓應力傳感方程分別為3)FIR=2.097-0.023σ和4)I-FIR=0.8814-0.0063σ。分辨率優(yōu)于0.28 MPa。2、彎曲應力:彎曲時壓應力導致譜帶藍移,曲率范圍0~16.03m~(-1),積分強度比-曲率曲線局部近似呈線性(I-FIR=I(178nm~607nm)/I(607nm~1000nm)),靈敏度約0.0033m。譜帶重心法分辨率不足以探測這種小的彎曲�？傮w上,相比于峰值波長頻移傳感應力,重心方法與熒光強度比法的靈敏度更高、對設備性能要求低,且能測量分辨兆帕以下的微小應力。此外,積分強度比法還可以用于彎曲應力或曲率的傳感。這些新型的應力傳感方法可用于工件表層應力及殘余應力的非接觸測量,在機械工程領域有良好的應用前景。
[Abstract]:At present, the main methods of fluorescence stress sensing include Cr~ (3) fluorescence pressure spectroscopy, stress luminescence and rare earth fluorescence pressure spectroscopy. The rich fluorescence lines of rare earth elements provide more sensitive material options for fluorescence spectroscopy. In this paper, the three stress sensing techniques are summarized and compared, and the unique advantages of rare earth fluorescence pressure spectroscopy are pointed out. Stress is usually characterized by spectral peak shift in force sensitive spectroscopy, but it is difficult to accurately detect the peak position of spectrum band which is used for monitoring signal of stress sensing in general. In the research of our group, a new sensing signal-emission spectral band has been designed for the wavelength of center of gravity and the ratio of fluorescence intensity. They all change monotonously with the change of compressive stress. In this paper, the stress sensing characteristics of two kinds of broadband fluorescent materials are studied. With the new sensing signal, the shift energy of the fluorescence band can be detected more accurately, and the pressure spectrum number is about 3 orders of magnitude larger than that of the ruby spectrum. In the experiment, the 405nm excitation light source is used to set up the reflective measuring light path, and a series of steady state emission spectra are recorded by using the optical fiber spectrometer. After data processing, the sensing equations of each sensing characteristic varying with the stress are given. The sensing performance is briefly analyzed. The results are as follows: (1) YAG:Ce~ (3): the compressive stress results in the blue shift of the spectrum band. The compressive stress range measured in the experiment is 0 ~ 1.59 MPa,. The pressure stress sensing equation of the spectral center of gravity is 位 _ (572.6-0.72) 蟽 _ (0.22) 蟽 ~ (2), and the local curve is approximately linear when the external stress is large. The sensitivity is about 0. 3 nm/MPa,. The sensitivity is 90 times of that of the corresponding phosphors in hydrostatic pressure. The compressive stress sensing equations of (I (570nm / I (510nm) and (I (420nm~570nm / I (570nm~800nm) are 1) FIR=8.4-1.74 蟽 0.54 蟽 2 and 2) I-FIR=0.79 0.03 蟽 -0.0092 蟽 -2.0.5 nm resolution spectrometer and 5.4 nm resolution spectrometer, respectively. The resolution of the spectrometer has no obvious effect on the precision of the stress sensing. The resolution is better than 0.08 MPa. (2) SrSiAlN_3:Eu~ (2): the influence of compressive stress and bending stress on the fluorescence spectrum is measured and analyzed, respectively. The compressive stress: compressive stress leads to the blue shift of spectral band. The compressive stress sensing equations of the spectral center of gravity and the mean wavelength of the spectral band are 1) 位 ~ (1) 625.1-0.16 蟽 and 2) 位 ~ (3) 0.3-0.138 蟽, respectively, in the compressive stress range of 0 ~ 5.83 MPa,. The compressive stress sensing equations of double wavelength ratio (I (632nm) / r I (582nm) and integral intensity ratio (I (628nm~800nm) / r I (240nm~628nm) are 3) FIR=2.097-0.023 蟽 and 4) I-FIR=0.8814-0.0063 蟽, respectively. The resolution is better than 0. 28 MPa.2, bending stress: the compressive stress results in the blue shift of spectral band, the curvature range is 0 ~ (16. 03) m ~ (-1), and the integral intensity ratio-curvature curve is approximately linear (I-FIR=I (178nm~607nm) / I (607nm~1000nm), sensitivity about 0. 0033 m). The spectral band barycenter resolution is not sufficient to detect this small bend. In general, compared with the peak wavelength frequency shift induction force, the method of center of gravity and fluorescence intensity has higher sensitivity, lower requirements for equipment performance, and can be used to measure and distinguish tiny stresses below MPA. In addition, the integral strength ratio method can also be used for sensing bending stress or curvature. These new stress sensing methods can be used for non-contact measurement of surface stress and residual stress of workpiece, and have a good application prospect in mechanical engineering.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：O614.33;O657.3
本文編號：2248161
[Abstract]:At present, the main methods of fluorescence stress sensing include Cr~ (3) fluorescence pressure spectroscopy, stress luminescence and rare earth fluorescence pressure spectroscopy. The rich fluorescence lines of rare earth elements provide more sensitive material options for fluorescence spectroscopy. In this paper, the three stress sensing techniques are summarized and compared, and the unique advantages of rare earth fluorescence pressure spectroscopy are pointed out. Stress is usually characterized by spectral peak shift in force sensitive spectroscopy, but it is difficult to accurately detect the peak position of spectrum band which is used for monitoring signal of stress sensing in general. In the research of our group, a new sensing signal-emission spectral band has been designed for the wavelength of center of gravity and the ratio of fluorescence intensity. They all change monotonously with the change of compressive stress. In this paper, the stress sensing characteristics of two kinds of broadband fluorescent materials are studied. With the new sensing signal, the shift energy of the fluorescence band can be detected more accurately, and the pressure spectrum number is about 3 orders of magnitude larger than that of the ruby spectrum. In the experiment, the 405nm excitation light source is used to set up the reflective measuring light path, and a series of steady state emission spectra are recorded by using the optical fiber spectrometer. After data processing, the sensing equations of each sensing characteristic varying with the stress are given. The sensing performance is briefly analyzed. The results are as follows: (1) YAG:Ce~ (3): the compressive stress results in the blue shift of the spectrum band. The compressive stress range measured in the experiment is 0 ~ 1.59 MPa,. The pressure stress sensing equation of the spectral center of gravity is 位 _ (572.6-0.72) 蟽 _ (0.22) 蟽 ~ (2), and the local curve is approximately linear when the external stress is large. The sensitivity is about 0. 3 nm/MPa,. The sensitivity is 90 times of that of the corresponding phosphors in hydrostatic pressure. The compressive stress sensing equations of (I (570nm / I (510nm) and (I (420nm~570nm / I (570nm~800nm) are 1) FIR=8.4-1.74 蟽 0.54 蟽 2 and 2) I-FIR=0.79 0.03 蟽 -0.0092 蟽 -2.0.5 nm resolution spectrometer and 5.4 nm resolution spectrometer, respectively. The resolution of the spectrometer has no obvious effect on the precision of the stress sensing. The resolution is better than 0.08 MPa. (2) SrSiAlN_3:Eu~ (2): the influence of compressive stress and bending stress on the fluorescence spectrum is measured and analyzed, respectively. The compressive stress: compressive stress leads to the blue shift of spectral band. The compressive stress sensing equations of the spectral center of gravity and the mean wavelength of the spectral band are 1) 位 ~ (1) 625.1-0.16 蟽 and 2) 位 ~ (3) 0.3-0.138 蟽, respectively, in the compressive stress range of 0 ~ 5.83 MPa,. The compressive stress sensing equations of double wavelength ratio (I (632nm) / r I (582nm) and integral intensity ratio (I (628nm~800nm) / r I (240nm~628nm) are 3) FIR=2.097-0.023 蟽 and 4) I-FIR=0.8814-0.0063 蟽, respectively. The resolution is better than 0. 28 MPa.2, bending stress: the compressive stress results in the blue shift of spectral band, the curvature range is 0 ~ (16. 03) m ~ (-1), and the integral intensity ratio-curvature curve is approximately linear (I-FIR=I (178nm~607nm) / I (607nm~1000nm), sensitivity about 0. 0033 m). The spectral band barycenter resolution is not sufficient to detect this small bend. In general, compared with the peak wavelength frequency shift induction force, the method of center of gravity and fluorescence intensity has higher sensitivity, lower requirements for equipment performance, and can be used to measure and distinguish tiny stresses below MPA. In addition, the integral strength ratio method can also be used for sensing bending stress or curvature. These new stress sensing methods can be used for non-contact measurement of surface stress and residual stress of workpiece, and have a good application prospect in mechanical engineering.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：O614.33;O657.3
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