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为评定光斑环围参量(包括环围功率和环围尺寸)阵列测试法的测量不确定度,给出了环围参量一般形式的定义和连续形式的计算表达式,归纳并比较了阵列测试法下光斑环围参量的3种常用计算方法,即近似环围功率法、准确环围功率法和等效环围尺寸法,给出了零阶近似下环围参量离散形式的计算表达式。根据不确定度传递律,推导了基于等效环围尺寸法的环围参量测量不确定度的一般表达式,讨论了常见简化条件下的环围参量测量不确定度表达式。建立了光斑环围参量计算及其不确定度评定的一套较完整的方法。以强度为高斯分布的光斑为例,得到了简化条件下的环围参量测量不确定度的解析表达式,并用数值模拟法验证了其正确性。 相似文献
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《中国光学与应用光学文摘》2005,(1)
TH703 2005010651 光斑矩参量阵列测试法的测量不确定度=Uncertainty of spot moment parameters measured with array detectors [刊,中]/高学燕(中物院应用电子学研究所.四川,绵阳 (621900)),苏毅…∥光学学报.-2004,24(10).-1411- 1416 为计算和评估光斑矩参量阵列测试法的测量不确定度,以光斑矩参量积分表达式为出发点,推导了零阶近似下光斑矩参量的离散表达式,初步分析了光强分布数据中单元位置及探测光功率的测量不确定度。在此基础上,根 相似文献
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为了对斜入射情况下的激光功率进行准确测量,采用了对阵列探测器的功率响应度依角度进行修正的方法。推导了依赖于光源位置、阵列探测器位置和阵列探测器姿态角的激光光线方向余弦和入射角的数学表达式,推导了光线方向余弦和入射角的测量不确定度表达式以及阵列探测器功率修正因子的不确定度表达式,并根据功率表达式进一步推导了功率测量不确定度表达式。由此建立了斜入射情况下激光功率阵列探测器测量方法及功率测量不确定度评定的一套较完整的方法。以典型参数为例,计算了斜入射下阵列探测器测量激光功率的不确定度,结果表明采用修正方法可显著减小激光功率测量不确定度。 相似文献
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针对目前散射激光告警中只能定位到散射激光光斑,而不能追溯到敌方来袭激光源的现状,构建了战场环境下包括敌方威胁激光源、照射于某平台上的散射激光光斑以及全向激光告警系统在内的空间三维几何模型,推导了平台上散射激光光斑轮廓解析表达式,以及轮廓上任意一点相对鱼眼镜头的物方半视场角表达式。将成像于探测器上的光斑进行鱼眼成像畸变校正并取光斑边缘点,计算得到三维几何模型诸参数。再将模型参数与传感器阵列信息相结合,可最终获取敌方威胁激光源相对系统的方位和距离信息。最后对以上方法进行了实验验证并对产生误差的原因进行了分析。 相似文献
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在光波导模场分布高斯近似条件下,根据星形光波导耦合器的耦合特性,推导出了基于累加运算和卷积运算近似表达的阵列波导光栅梳状带通滤波器光谱响应效率的函数表达式。给出了阵列波导光栅梳状带通滤波器光谱响应效率曲线的半最大值全宽度和阵列波导光栅梳状带通滤波器的通道中心波长的光谱响应度与器件参数的关系。在输入信号光谱分布高斯近似条件下,给出了阵列波导光栅梳状带通滤波器信号通道传输效率的计算表达式和输入信号光谱宽度对阵列波导光栅梳状带通滤波器信号通道输出特性的影响。给出了物理意义明确的函数表达式,它们可为快速分析阵列波导光栅梳状带通滤波器的特性提供理论基础。 相似文献
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部分偏振散斑引起的像强度中心漂移的理论计算 总被引:1,自引:0,他引:1
从部分偏振散斑光场的统计理论出发,对像斑强度中心漂移进行了计算,导出了测量的基本不确定度的表达式,指出了在部分偏振光照明下有利于提高测量 相似文献
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光斑强度分布的测试在目标跟踪检测、激光光束质量诊断和激光束波前测量等方面具有重要:意义。常用的光斑测试法有面阵CCD法、线阵CCD扫描法、单元探测器扫描法、热敏纸法以及针对某些特殊应用的各具特色的阵列测试设备法。这些方法最终都将给出探测面上光斑强度二维离散分布数据,故都可等效为阵列测试法。 相似文献
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为分析振幅和相位发生畸变情况下光束焦斑质心位置所受的影响,以光波标量衍射理论中的夫琅和费衍射公式为基础,根据光斑强度分布一阶矩质心位置的定义,推导了直接依赖于光束近场复振幅分布的焦斑质心位置的一般表达式。进一步推导了焦斑质心位置对光束近场强度分布和相位斜率分布的依赖关系式,并对该式清晰的物理意义进行了阐述。利用焦斑质心位置表达式,可分析和确定由于振幅调制和相位畸变导致的质心位置偏移。最后,对无相位畸变和存在低阶泽尼克相位畸变情况下的简单畸变光束进行了相应的分析讨论。 相似文献
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The scattering of two charged strongly interacting particles is described on the basis of the P-matrix approach. In the P matrix, it is proposed to isolate explicitly the background term corresponding to purely Coulomb interaction, whereby it becomes possible to improve convergence of the expansions used and to obtain a correct asymptotic behavior of observables at high energies. The expressions for the purely Coulomb background P matrix, its poles and residues, and purely Coulomb eigenfunctions in the P-matrix approach are obtained. The nuclear-Coulomb parameters of the low-energy scattering of two charged hadrons are investigated on the basis of this approach combined with the method for isolating the background P matrix. Simple explicit expressions for the nuclear-Coulomb scattering length and effective range in terms of the residual P matrix are derived. For models of short-range strong interaction, these expressions give a general form of nuclear-Coulomb parameters for low-energy scattering. Specific applications of the general expressions derived in this study are exemplified by considering, on the basis of these expressions, some exactly solvable models of strong interaction, including the hard-core model, and, for these models, the nuclear-Coulomb parameters for low-energy scattering at arbitrary values of the orbital angular momentum are found explicitly for the first time. In particular, the nuclear-Coulomb scattering length and effective range are obtained explicitly for the boundary-condition model, the model of a hard-core delta-shell potential, the Margenau model, and the model of square-well hard-core potential. 相似文献
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S.Y. El-Zaiat 《Optics & Laser Technology》1997,29(2):63-65
The thickness and refractive index of a thick transparent plate are measured by using an unexpanded HeNe laser beam. The laser beam is incident at different angles onto the plate; and then two reflected beams; from the front and back surfaces; are received on a distant screen: the corresponding separations between them are measured. A theoretical relation between the refractive index; thickness; angle of incidence and separation is derived. This relation is experimentally verified and shows good agreement. The errors in the measured thickness and refractive index are analysed. The method is non-contact; non-destructive and low cost. 相似文献
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W. Delaney 《International Journal of Theoretical Physics》1974,10(4):239-251
A semiclassical model in which elementary particles are represented as systems of charged shells with associated quark-like quantum numbers is presented. Specifically the baryons are considered. Formulas are obtained which express baryon masses and magnetic moments in terms of model parameters which relate baryon and quark properties. Basically, the mass and moment formulas are expressions for mass ratios and magnetic moment ratios. Simple identifications for the model parameters lead to a prediction for the proton-electron mass ratio and to fairly accurate predictions for the baryon magnetic moments in units of the proton moment. The mass and moment formulas, which relate corresponding properties of different particles, are generalised such as to express relationships between the members of a sequence of particles, where such a sequence is conceived of as containing only one (normal) baryon. A specific sequence, containing the proton and electron, is proposed; various physical properties of the particles in the sequence are determined. In particular, a second prediction for the proton-electron mass ratio is obtained; the two predictions differ numerically but both agree with the measured value of the mass ratio within experimental error. 相似文献
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Spectrometer functions and peak heights have been derived analytically for a 127° capacitor on the basis of the corresponding second-order trajectory equations. The expressions derived are discussed under the various conditions appropriate to the use of the capacitor as a monochromator or as an analyser. A figure of merit is introduced, and optimisation of the geometrical parameters according to this criterion is carried out. The maximum angular acceptance of a capacitor is discussed, and the spurious-background problem is reconsidered. Finally, a space-charge model is derived which describes the main experimental observations for the first time. The calculus derived in this paper and exemplified for a 127° capacitor can be applied equally to other geometries if the corresponding trajectory equations are known. 相似文献