Hit-or-miss transform based infrared dim small target enhancement

To efficiently enhance a dim infrared small target embedded in heavy clutter, a hit-or-miss transform based method is proposed in this paper. First, the gray level hit-or-miss transform is given and discussed. Then, by analyzing the structuring elements used in the hit-or-miss transform following the purpose of infrared small target enhancement, a simple infrared small target enhancement method is proposed by using flat structuring elements and a threshold parameter. The threshold imports the properties of infrared small target into the gray level hit-or-miss transform, which improves the performance of the hit-or-miss transform for infrared small target enhancement. Experimental results on infrared dim small target images with different clutter backgrounds verified that the proposed method was efficient for infrared small target enhancement.     

傅里叶变换红外光谱仪光阑孔径及扫描速率设置探讨

傅里叶变换红外光谱仪辐射通量大,特别适用于测量弱信号光谱,从而具有很高的灵敏度.因此也对处理系统有着苛刻的要求,在实际测试中,博里叶光谱仪光阑孔径及扫描速率设置是相关联的,直接影响到采集及数据处理的精度.通过试验,研究探讨了傅里叶光谱仪光阑孔径及扫描速率设置极限及平衡点,兼顾快与准.     

基于ATR-FTIR的竹节人参的分析研究

采用傅里叶变换红外光谱仪的衰减全反射附件——OMNI采样器,对3种不同产地的竹节人参进行了红外光谱对比分析。结果表明,竹节人参中的红外光谱主要由皂甙类、多糖、氨基酸等物质的特征吸收峰组成。不同产地的竹节人参在1190—890cm-1区域的红外光谱吸收峰差异较显著,同时产地不同的样品其吸收峰强度亦有所不同。ATR-FTIR法简便、快速,可用于竹节人参的分析鉴别。     

Morphological operator for infrared dim small target enhancement using dilation and erosion through structuring element construction

To effectively enhance infrared dim small target, a new morphological operator is proposed by constructing two structuring elements based on the properties of target regions and their surrounding background. By utilizing the two constructed structuring elements, the proposed morphological operator uses dilation and erosion to enhance the target regions and suppresses the surrounding background, which directly achieves infrared small target enhancement. Also, the proposed method is simplified by using flat structuring elements. Experimental results show that the proposed method can effectively enhance infrared dim small target embedded in clutter background.     

Morphological center operator for enhancing small target obtained by infrared imaging sensor

Infrared small target in image obtained by infrared imaging sensor is usually different from the surrounding regions, which is the important region in infrared image for different applications. However, the infrared small target is dim and embedded in clutter background, which makes the small target difficult to be detected or recognized. So, it is important to enhance infrared small target. Morphological center operator could smooth important image features, which may be well used for infrared small target enhancement. To well enhance infrared small target, a morphological center operator based method is proposed. The morphological center operator is specified to suppress most of the background of the infrared image through the strategy of feature extraction. Then, the infrared small target is well enhanced. Experimental results show that, the proposed method performs well for enhancing infrared small target and the performance is better than some other methods. So, the proposed method could further improve the performance of infrared imaging sensor.     

紫外傅里叶变换光谱仪干涉图数据处理

阐述了干涉图数据处理方法 ,采用紫外傅里叶变换光谱仪实验测量了汞灯光谱干涉图。使用四阶Blackman Harris窗函数作为切趾函数 ,采用最小二乘法拟和多项式对光源傅里叶变换光谱进行相位校正 ,获得了高精度的Hg紫外发射光谱     

FTIR应用于经染色处理的妇科肿瘤组织切片的研究

应用FTIR分析经染色处理的妇科肿瘤组织切片及常规红外切片,将二者的红外光谱图与正常组织的红外光谱图对照.结果显示,经染色处理的肿瘤组织的各特征峰与未经染色的肿瘤组织的特征峰大体一致,二者与正常组织的红外光谱相比,都具有明显且有规律的差异,说明FTIR直接对经染色处理的肿瘤组织切片进行红外分析以作为肿瘤诊断的依据是可行...     

傅里叶变换红外光谱曲线的数据转换研究

为将打印纸质的傅里叶变换红外光谱图转化为数字光谱,测试了玉米黄质样品的傅里叶变换红外光谱,在光谱保存为数字光谱的同时也通过打印机打印出光谱曲线。使用扫描仪把打印出纸质的光谱转化为计算机储存的图像,对图像进行旋转调整,图像识别软件把图中的光谱曲线转换为数字光谱。对比从打印光谱中提取的数字光谱和直接保存的数字光谱,发现它们在吸收峰的位置上十分接近,最大偏差为0.85cm^-1,光谱的相关系数达到99.78%。研究表明该方法可以快速准确的把打印光谱图转换为数字光谱,为从老式傅里叶变换红外光谱仪的测试结果中获得数字光谱提供了一种便捷的方法。     

傅里叶光谱仪扫描速度对测试的影响

扫描速度快是傅里叶光谱仪的突出优点之一,一般比棱镜式或光栅式光谱仪快上数百倍,但同时也对测试结果也带来了一定的不确定性。通过测试对比,研究了傅里叶光谱仪扫描速度对不同红外探测器的影响情况,最后对应于不同的测试样品及目的,给出了扫描速度的参考设定值。     

红外光谱法研究射频功率对微晶硅薄膜微结构的影响

采用射频等离子体增强化学气相沉积(RF-PECVD)技术,在硅衬底上以不同的射频功率生长微晶硅(μc-Si:H)薄膜,利用傅里叶变换红外透射光谱技术对薄膜进行测试.通过对红外透射光谱的高斯拟合分析,结果表明薄膜中的氢含量和硅氢键合模式跟射频功率密切相关;当射频率从30W增加到110W时,薄膜中的氢含量先减少后慢慢增加,而结构因子逐渐增加后再减小,并且硅氢键合模式由以SiH为主转变为以SiH2为主.并讨论了这些参量随射频功率变化的机理.     

前放滤波对红外探测器光谱测试的影响

傅里叶变换红外光谱仪有着测试效率高、分辨率高等优点,一般比棱镜式或光栅式在实用波段分辨率要高上40倍,对红外探测器进行测试,受到动态范围、光敏元面积、外部接口要求等影响,必须通过电流放大器进行连接.通过测试对比,研究了前放波率的不同设置对光谱测试的影响,分析了影响机理,得到了前放较佳的设置波段.     

去卷积和高斯拟合方法在FTIR光谱处理中的应用

讨论了FTIR光谱产生的机理,并分析了影响其光谱质量的两种原因:(1)干涉图的截断;(2)仪器采样率低.为了改善由上述两种原因引起光谱畸变,我们对其进行了仪器线型函数去卷积和高斯拟合,使其更接近实际光谱,从而使由其计算出的物理量更接近实际值,结果更精确.     

红外光谱对啤酒酵母培养过程的研究

采用衰减全反射红外光谱技术跟踪了啤酒酵母发酵过程，解析了发酵过程的红外光谱变化。在啤酒酵母培养过程中，1106cm^-1吸收峰强度的下降反映出基质麦芽糖的消耗；而产物乙醇的形成会引起880、2976、2980cm^-1处吸收峰强度增加和1625cm^-1处吸收峰的下降，从上述吸收峰强度的变化可描述啤酒酵母培养的进程。     

微秒级时间分辨傅里叶变换红外光谱激发系统研究

本文阐述了自行研制的、与FTIR仪器连接运行的时间分辨FTIR系统,包括光激发和电场激发两套系统。检验和测试了系统的工作参数和性能,获得了微秒-毫秒级时间分辨光谱图。     

Study on Infrared Spectral Radiance by Remote Fourier Transform Infrared Spectroscopy

Abstract

Infrared emission spectra emitted by high luminosity infrared pyrotechnics have been observed remotely using the Fourier transform infrared spectroscopy. The primary purpose of the study is to determine infrared spectral radiance distribution, their time—resolved spectra and integrated emission energy. The spectra have been recorded between 4000 – 800cm^?1 region with spectral resolution of 4cm^?1. The study is very important for many applications.     

The Influence of the Temperature of Blackbody for Calibrating FTIR System on the Instrument Response Function∗

The instrument response function of Fourier transform infrared spectrometer is a very important parameter in infrared emission Spectroscopy to obtain infrared spectral radiance distribution of the desired sample, the concentrations of the components of combustion products in the flame etc. This paper gives the effect of the temperature of the standard blackbody for calibrating Fourier transform infrared spectrometer on the instrument response function. The result illustrates that the values of the instrument response functions decrease as the blackbody temperature increased, and tends to a limit. The paper points out that the condition must be observed for using instrument response function correctly.

     

傅里叶变换红外光谱研究鲤鱼雌激素受体与邻苯二甲酸酯的相互作用

通过电泳结合电洗脱(SDS-PAGE)的方法分离纯化鲤鱼体内的雌激素受体,得到高纯度的受体;再通过傅里叶变换红外光谱探讨雌激素受体与邻苯二甲酸二正丁酯(DBP)结合后其结构的变化,通过实验发现,配体DBP能与雌激素受体结合并对雌激素受体的结构产生了明显的影响。     

万寿菊花渣中残余叶黄素酯的红外光谱分析

利用傅里叶变换红外光谱技术测定了万寿菊花瓣和提取叶黄素酯后万寿菊花渣的光谱,比较两者的光谱发现花渣中羰基、甲基和亚甲基的相对吸收强度明显减弱。由于叶黄素酯从万寿菊花瓣中被提取,导致花渣中酯类物质含量减少,从而在光谱中反映出这3个吸收峰减弱。羰基的吸收峰主要来源于酯类物质,利用该吸收峰的强弱可以定性反映出花渣中叶黄素酯残余量的多少。研究表明:傅里叶变换红外光谱技术能准确和快速提供万寿菊花瓣和花渣中酯类物质的含量信息,可以作为一种检测花渣中叶黄素酯残余量的手段。     

FTIR和Raman用于盐酸曲马多的结构分析

采用AVATAR 360型傅里叶变换红外光谱仪和RM-1000型激光共聚焦拉曼光谱仪测定盐酸曲马多的红外光谱和拉曼光谱。拉曼光谱和红外光谱中均显示出了盐酸曲马多的特征峰,都能够用于其结构鉴别。采用红外、拉曼光谱这两种方法互相印证,互相补充,可增强鉴定的准确性、可靠性。