ICCD增益对激光主动成像系统成像品质的影响

以理论分析和实验数据为基础,用信噪比和对比度指标评价图像品质,分析了ICCD增益对图像信噪比和对比度的影响,为使系统成像品质最佳而合理选取增益大小提供了有益的参考。     

Real-time measurement of temperature field with ICCD as sensor (I)

Real-time measurement of temperature field can be achieved by colorimetric method using ICCD as sensor. However, due to limited dynamic response range of the ICCD, the measurable range of temperature is very small. In order to expand the temperature measuring range, a device was developed which can take several two-color images with different shutoff times subsequently within very short time. First, the principle of real-time measurement of temperature field with two-color thermal images is introduced. Then theoretical analysis on this method, including determination of various parameters, such as shutoff time, number of temperature range, wavelength of the colors, etc. is described. Experiments were conducted, which proved that theoretical analysis coincides with the experimental results. Project supported by the National Natural Science Foundation of China (Grant No. 59475064) and the Natural Science Foundation of Jiangxi Province.     

空基紫外成像仪关键器件ICCD非均匀性校正技术

从理论上分析了ICCD光电响应非均匀性的产生机理,并由此建立光电响应数学模型。基于两点多段非均匀性校正算法给出了ICCD非均匀性校正方程,并通过大量实验得到ICCD在特定条件下的校正系数。在实验过程中发现ICCD的雪花点(主要由探测器的随机噪声引起)和盲点是影响非均匀性改善的主要因素,采取相应照度的响应进行了补偿。结果表明:通过补偿和校正输出图像,可以有效地减小紫外成像仪由探测器的非均匀性所带来的测量误差,使非均匀性降低了37.1%,在一定程度上减少了由于ICCD的物理特性和制造缺陷所带来的固有图像噪声。     

ICCD的光纤耦合技术

文中主要介绍ICCD光纤耦合工艺技术的研究工作,并介绍了国内外相关技术的历史及发展现状。文中所述的ICCD的耦合工艺,继承了国肉研究的技术特点,同时,参考了国际上一些著名公司的相关技术,例如以色列的ORLIL公司、法国的PHOTONIS公司、荷兰的DEP公司和ADMEC公司、俄罗斯的ELECTRON公司等。因此,具有相当的先进性、代表性和参考价值。     

Intensified CCD Image Sensor

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样品温度对激光诱导黄铜等离子体辐射特性的影响

为了研究样品温度变化对激光诱导铜等离子体特征参数的影响,利用单脉冲激光诱导激发加热台上的样品形成等离子体, 改变样品温度获得相应的黄铜等离子体发射光谱。分析了样品温度变化时特征谱线强度的变化,并在局部热 平衡(Local thermodynamic equilibrium, LTE)条件下,利用Boltzman方程和Stark展宽计算并获得不同样品温度 条件下等离子体电子温度和电子密度随时间的演化规律,同时讨论了激光诱导金属等离子体光谱增强的原因。 实验结果表明,延迟时间相同时,样品温度越高,谱线强度越强,电子温度和电子密度越大。由此可见, 适当升高样品温度可以提高谱线强度。     

The galvanoluminescence spectra of barrier oxide films on aluminum formed in organic electrolytes

In this paper, for the first time we have presented the results of the galvanoluminescence (GL) spectra measurement obtained from barrier oxide films during aluminum anodization in various barrier film forming organic electrolytes (aqueous solution of citric acid, tartaric acid, malic acid, succinic acid and ammonium tartarate). Galvanoluminescence spectral measurements were performed utilizing spectrograph system based on the Intensified Charge Coupled Device (ICCD) camera, intended for time-resolved detection of GL phenomena dynamics. The spectra were recorded for different values of electrolyte temperature and anodization current density. We have showed that there are strong GL bands in the visible region and the shape of the spectra as well as peak intensity of the GL bands depend on the anodization voltage. The results cleraly indicate the existance of more then one type of GL centra or GL mechanisms in barrier films formed in organic electrolytes.     

“日盲”紫外增强型CCD的自动增益控制

为使"日盲"紫外增强型电荷耦合器件(SBUV-ICCD)适用于不同辐亮度目标的探测,并避免由于长时间高亮度照射引起的器件损害,提出了适用于SBUV-ICCD的自动增益控制(AGC)算法。应用连续N帧图像直方图求和作为分析对象,将其分为背景段、目标段、明亮段及饱和段,使用明亮段与目标段的比例系数及饱和段与明亮段的比例系数为控制参量,完成了AGC算法,并设计实验对其进行了验证。实验结果表明,通过控制饱和系数0.2,明亮系数在0.4～0.8内,当目标辐亮度突变或缓慢变化时该算法均能够在1～3s内实现增益的调节,在保护相机的同时使图像具有较好的分辨率。     

An experimental study on high temperature and low oxygen air combustion

High temperature preheated and diluted air combustion has been confirmed as the technology, mainly applied to industrial furnaces and kilns, for realizing higher thermal efficiency and lower emissions. The purpose of this study was to investigate fundamental aspects of the above-mentioned combustion experimentally and to compare with those in ordinary hydrocarbon combustion with room temperature air. The test items were exhaust gas components of CO, NO_x, flame shape and radical components of CH, OH and C₂, which we measured with gas analyser, camera and ICCD (Intensified Charged-Coupled Device) camera. Many phenomena, as a result, which appeared in the combustion with the oxidizer, low oxygen concentration and extremely high temperature air, such as expansion of the flammable limits, increased flame propagation speed, looked very strange in comparison with those in existing combustion technology. We confirmed that such extraordinary phenomena were believable through a hot-test experiment.     

基于二维焊接温度场检测的三维温度场计算机模拟

采用图象比色法,建立了焊接温度场实时检测系统,快速获取了二维焊接温度场分布。对于低碳钢薄板ＴＩＧ焊,利用实际检测二维温度场分布结果,对各种热源分析模型进行了验证,得到双椭圆热源分布模型二维温度场计算结果与实际温度检测结果最为接近。利用双椭圆热源分布的数值计算模型和实际检测二维温度场分布结果作为边界条件,获得了整个焊件更宽温度范围和三维温度场分布的在线模拟。正反熔宽模拟计算结果与实际的结果吻合。