共查询到20条相似文献,搜索用时 140 毫秒
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火焰中N_2分子CARS谱及温度测量 总被引:2,自引:0,他引:2
本文实现了对乙炔/空气火焰中N_2分子CARS谱的测量,同时也进行了N_2分子CARS谱的理论计算,通过实验测量与理论计算比较,确定了火焰的温度.其结果与我们用OH基荧光方法测量的结果基本符合. 相似文献
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介绍了在交流阻抗及功率因数测量中由测量仪表引起的偏差的修正方法.主要讨论了一级修正和精确修正两种方法,导出了计算复阻抗和功率因数的修正式.给出了测量日光灯电路的阻抗及功率因数的实例.由计算结果可以看出,精确修正后的结果与不做修正的结果之间存在较大的差异,说明在要求较精确测量的情况下,应该对测量结果进行修正. 相似文献
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子孔径拼接干涉测量的精度估计方法 总被引:6,自引:3,他引:3
作为一种高精度的光学镜面测量方法,子孔径拼接干涉测量的精度指标十分重要,必须对其进行定量估计.提出将子孔径拼接十涉的结果与全口径测试结果进行对比实验,将全口径测试结果作为拼接测量结果的参考真值,讨论了拼接测量精度评价指标及其计算方法.全口径测试与子孔径拼接干涉测量的几何参量并不相同,提出将全口径测试结果与子孔径拼接结果进行最优匹配,其原理与子孔径拼接算法的原理相同.在最优匹配后计算拼接测量精度的评价指标,通过测量实验进行了验证,结果表明最优匹配后的误差指标比未经最优匹配的误差指标减小约48%,证明上述方法是一种定量估计子孔径拼接干涉测量精度的有效方法. 相似文献
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In this paper, spectral hole depth dependence on temperature below 10 K in Tm3+:YAG crystal is investigated in detail. A novel model is proposed to analyze the temperature dependence on spectral hole. By using the proposed model, we theoretically deduce the temperature dependence of spectral hole depth. The results are compared with experimental results and they are in good agreement. According to the theoretic results, the optimum temperature in experiment can be found. 相似文献
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R. Balasubramanian 《Journal of Molecular Liquids》2010,151(2-3):130-133
The supercritical temperature, the inversion temperature and the critical compressibility factor of caesium, rubidium and potassium are correlated through the generalised van der Waals equation of state. This three-parameter equation differs from the known van der Waals equation of state by the introduction of a third parameter in the expression for molecular pressure. For caesium, rubidium and potassium, the ratios of the supercritical temperature to the inversion temperature are estimated. The results of estimation are in agreement with the results from other equations which are based on experimental data. It has been established that caesium, rubidium and potassium obey the single-parameter law of corresponding states with the ratio of the supercritical temperature to the inversion temperature as the thermodynamic similarity parameter. 相似文献
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用光谱诊断技术测定高能单元推进剂的温度分布 总被引:3,自引:0,他引:3
采用光谱诊断技术中的相对强度法测定了单元推进剂六硝基六氮杂异伍兹烷(HNIW)在3 MPa和5 MPa两种压力下的燃烧火焰温度分布。结果表明,相对强度法能准确地测出单元推进剂HNIW在整个燃烧过程的温度分布曲线,测得的最高燃烧火焰温度低于相应压力下的理论计算温度;测量压力升高,最高燃烧火焰温度更接近于理论计算温度。此实验结果说明:在较高压力条件下,用相对强度法能够准确地测定高能高燃速推进剂的燃烧火焰温度分布。 相似文献
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Some physical properties of an SK spin glass subject to slow cooling are investigated. Among those are Edwards-Anderson order parameter, energy, field cooled and zero field cooled susceptibilities. The results are compared with predictions from Parisi's solution. Different values are obtained for the field cooled susceptibility whereas other quantities are identical in both calculations. Ultrametricity results in a natural way if adiabatic temperature changes involving cooling and heating periods are considered. Some results are also given for adiabatic cooling in a finite external field and for adiabatic changes of the field at constant temperature. The present setup allows to investigate explicitly the dependence on history at least for adiabatic changes of temperature and external field. 相似文献
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针对斯托克斯光和反斯托克斯光的本质损耗、附加损耗使分布式光纤温度传感器产生测温误差的问题,通过对分布式光纤温度传感器的温度解调原理的研究,提出了拟合斯托克斯光与反斯托克斯光之间衰减差的方法实现温度自补偿,以此减小测温误差.以传感光纤上不同位置的两部分作为参考段和测温段,参考段的光信号作为测温段拟合多阶衰减差和解调温度的参量,通过引入多阶拟合结果解调温度,减小因斯托克斯光和反斯托克斯光的本质损耗、附加损耗导致的温度误差,实现温度的初步修正.改变光纤上同一位置的温度,取3组不同温度值及对应信号值计算引入拟合衰减差前后的瑞利噪声,分析了瑞利噪声与光纤长度和温度的关系,通过引入拟合衰减差消除瑞利噪声,减小了斯托克斯光和反斯托克斯光的本质损耗、附加损耗导致的瑞利噪声误差,实现温度的再次修正.分析比较多阶衰减差拟合结果对测温误差以及消除瑞利噪声的影响,获得最优拟合阶次.在拟合因参考段的附加损耗而导致的测温段的附加误差后,通过拟合结果进行温度补偿,完成了最终温度修正.实验结果表明,在30-90℃,引入一阶线性拟合结果的温度修正效果最好,经过三次修正后,测温误差从10.50℃降低至0.90℃. 相似文献
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The temperature dependence of the sputter yield and the energy spectrum of sputtered atoms have been investigated on the basis of a standard model for thermal spikes. A high-temperature and a low-temperature regime have been identified in the temperature spectrum making up the evaporation yield. The high-temperature component of the yield as well as the associated energy spectrum are only very weakly dependent on ambient target temperature. The relative variation is the less pronounced the higher the spike temperature. The low-temperature component is associated with the long-time behavior of the spike, and measurable evaporation takes place over time intervals where spikes overlap. The importance of time constants for macroscopic heat transport is pointed out. The results are shown to provide a framework within which experimental results on the temperature dependence of the sputter yield of metals can be explained. The results are also consistent with measured temperature dependences in the sputter yield of insulators.On leave from Instytut Fizyki, Uniwersytet Jagiellonski, PL-30-059 Krakow, Poland 相似文献
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出炉温度和冷却速率是大尺寸硫系玻璃制备过程中的关键参数. 在热传导方程理论基础上,运用最小二乘拟合的方法建立计算圆柱形硫系玻璃冷却过程温度分布的理论模型. 利用该模型对硫系玻璃的出炉温度、出炉后温度分布以及冷却速率进行了仿真分析,并将仿真分析结果与实验数据进行了比较. 研究表明:出炉后玻璃棒的温度处于非稳态非均匀分布,其表面降温最快,且速率随时间呈现指数型下降;玻璃棒温度从中心到边缘近似呈抛物线型分布;当以高于析晶温度50-100 ℃,表面热交换系数180 W ·m-2 K
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红外硫系玻璃
淬冷降温模型
析晶 相似文献
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The ordered and disordered phases of spin-1 Heisenberg and Ising antiferromagnets with easy-axis single-ion anisotropy on a three-dimensional lattice are studied. By using of the double-time Green’s function method within the Tyablikov decoupling for the exchange anisotropy and Callen’s approximation for the single-ion anisotropy, the Néel temperature, magnetization and susceptibility are investigated. Their relations with the temperature and anisotropic parameter are analyzed over the entire range of temperature. It is found that our results agree well with spin wave theory results at low temperature, agree with the high temperature series results at high temperature, and compare reasonably well with the linked-cluster series approach and ratio method results at intermediate temperature. 相似文献