锥齿光隙黑体腔

用几何光学方法模拟黑体得一锥齿光隙黑体腔。给出黑体数学模拟式及适用胶体参数。     

杰出的导师亥姆霍兹及其对维恩的影响

文章在简要介绍著名物理学家亥姆霍兹在生平及科学贡献的基础上，着重讨论了亥姆霍兹作为一位杰出的导师，对维恩的一生产生了决定性的影响。     

侧壁带光隙槽的黑体腔

本文介绍三种黑体腔的设计方法:锥齿光隙黑体腔、矩齿光隙黑体腔和梯形光隙黑体腔。写出它们的设计公式,并分别给出一适用腔体的几何参数。     

单黑体温控的热成像仪MRTD野外在线自动检测技术研究

为满足红外热像仪MRTD野外在线全自动检测要求,设计了一种新型MRTD检测方法。硬件采用单黑体温差控制技术,在减小检测设备体积质量的同时保证了黑体目标与环境背景的温差控制精度,采用串口通信控制与CCD图像采集处理等技术有机结合实现温差控制及图像采集处理的协调统一;在软件上采用优化的处理算法精确地提取目标及背景区域,并利用不同温差下目标与背景区域的灰度差计算出被测热像仪MRTD参数值。经实验检验,该结果与人眼观测所得结果误差在002℃以内,研制出的检测设备具有结构简单、体积及质量小、操作简便等优点。     

黑体热辐射的光波长定义域研究

对黑体热辐射的光波长定义域进行了深入研究．结果表明,热辐射光波长定义域与温度和计算精度因子有关,温度越低,精度因子越大,长波长界越长;温度越高,精度因子越大,短波长界越短;由光波长定义域引起的热辐射功率计及误差与温度无关,且精度因子大于3时,该误差便小于万分之几．     

Comparison of the standard weighted-sum-of-gray-gases with the absorption-line blackbody distribution function for the computation of radiative heat transfer in H2O/CO2 mixtures

This paper presents the computation of radiation heat transfer in a cylindrical enclosure in which the dimensions, the chemical species concentrations and the temperature fields make a realistic representation of an actual combustion chamber. Two gas models are applied and compared: the absorption-line blackbody distribution function (ALBDF), and the standard weighted-sum-of-gray-gases (WSGG) based on coefficients and correlations that are widely used in engineering. While the standard WSGG is restricted to the assumption of homogeneous gas mixture, the ALBDF can be applied to both homogeneous and non-homogeneous media. For the two gas models, the radiative exchanges are computed with the aid of the Monte Carlo method. The results show considerable discrepancies between the WSGG and the ALBDF models for the homogeneous medium. In addition, the importance of considering the non-homogeneity of the medium for an accurate computation of the radiative heat transfer is shown.     

Influence of a Single Frequency Electromagnetic Wave on Energy Spectrum of Nonpolariton System in a Kerr Nonlinear Blackbody

In a Kerr nonlinear blackbody, bare photons with opposite wave vectors and helieities are bound into pairs and unpaired photons are transformed into a different kind of quasiparticle, the nonpolariton. The present paper investigates the influence of a single frequency electromagnetic wave on the energy spectrum of the nonpolariton system. We find that the wave can lead to an energy shift of nonpolaritons. Moreover, we calculate the first-order energy shift on certain conditions.     

锶原子光晶格钟黑体辐射频移评估

在中性原子光晶格钟的系统不确定度评估中,通常黑体辐射引起的频移是最大的一项.黑体辐射频移主要受周围环境温度的影响.针对国家授时中心的锶原子光晶格钟实验系统,通过理论分析、腔体表面温度的测量和软件模拟相结合的方法,评估了锶原子光晶格钟黑体辐射频移的修正量和不确定度.其中主要分析了锶原子炉、蓝宝石加热窗口、透过窗口片进入到真空腔体内的室温以及Zeeman减速装置对原子团处的热辐射引起的黑体辐射频移.在真空腔体外表面设置了5个测温点,利用校准过的铂电阻温度传感器监测真空腔体外表面的温度变化,用SolidWorks绘图软件建立腔体模型,通过有限元分析软件模拟出在真空腔体温度变化0.72 K时,原子团所处位置温度的波动为0.34 K.最终得到黑体辐射频移总的修正量为-2.13(1) Hz,不确定度为2.4×10~(-17).     

镜腔黑体模型

根据黑本光壁腔特征，利用几何光学方法模拟得到－β锥／ｅ柱隙黑体模型。推导出黑体数学模拟式，给出适用黑体模型参数。     

Transition to stochasticity in a one-dimensional model of a radiant cavity

We make a numerical study of the solutions of the equations of motion for the electromagnetic field in a one-dimensional model of a radiant cavity. Our main results are as follows: (1) There exist Stochasticity thresholds such that below them one has ordered motions without energy exchanges, while chaotic motions with intense energy exchanges occur above them; (2) above thresholds there is a trend toward equipartition of energy (in time average) among the normal modes of the field, but this occurs in the sense of Boltzmann and Jeans, namely, with the higher frequencies requiring longer and longer times in order to be involved in the energy sharing.