共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
本文研究了一种用冷蒸气原子吸收光谱测定铜精矿中汞的方法。铜精矿用逆王水或硫酸-高锰酸钾(固)消化后用测汞仪测定其中的汞含量。测定结果的相对标准偏差小于5%;回收率在92-107%之间。 相似文献
3.
4.
5.
高频-红外吸收光谱法测定煤中全硫 总被引:1,自引:0,他引:1
介绍了用 ELTRA CS- 80 0红外碳硫分析仪测定煤中硫的方法 ,确定了最佳分析条件 ,例如助熔剂、称样量等条件。本法操作简单、分析时间短 ,测定结果令人满意。 相似文献
6.
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. 相似文献
7.
Small target enhancement is one of the crucial stages in infrared small target detection. In this paper, we propose a new method using phase spectrum of Quaternion Fourier Transform to enhance small targets while suppressing backgrounds for infrared images. This is inspired by the property that regularly Gaussian-like shape small targets could be considered as attractively salient signal in infrared images and the location information of such signal is implicitly contained in the phase spectrum from frequency domain. Formally, in the proposed method, we adopt the phase spectrum of Quaternion Fourier Transform instead of using traditional Fourier Transform to enhance the targets since the quaternion provides at most four data channels than only one for the latter, which could be helpful to broad types of background clutters by adding more information. For the construction of the quaternion, we present a second-order directional derivative filter via facet model to compute four second order directional derivative maps from four directions respectively as the four data channels. This filter is used to suppress noises and distinguish the targets and backgrounds into separably different textures so that it would boost the robustness of small target enhancement. In experiments, some typical infrared images with various scenes are tested to validate the effectiveness of the proposed method. The results demonstrate that our method actually has good performance and outperforms several state-of-the-art methods, which can be further used for infrared small target detection and tracking. 相似文献
8.
9.
利用傅里叶变换红外光谱法研究了云南省思茅地区所产不同等级的普洱生茶和熟茶。结果显示:生普和熟普的红外光谱虽然整体上十分相似,但由于生普和熟普的生产工艺不同,其化学成分的组成比例也各异,因而生普和熟普均具有其各自的特征红外光谱,且不同品质的生普和不同品质的熟普之间,其红外光谱均有明显的差异。根据红外光谱的特征峰形和吸光度比不仅可以区分生普和熟普,而且有可能区分生普或熟普的不同品质级别。傅里叶红外光谱法快速、简便、直观且样品不需要分离提取,适用于普洱茶的级别鉴别。 相似文献
10.
11.
12.
13.
14.
A photoacoustic detection system mainly based on a Fourier transform infrared spectrometer has been constructed and some tentative evaluations of its performances have been made. Infrared photoacoustic spectra of cotton and nylon cloths have been obtained without troublesome sample preparations which are necessary in conventional infrared spectrometry. It can be said that the Fourier transform infrared photoacoustic spectroscopy is useful for the structure elucidation of organic polymers. 相似文献
15.
16.
17.
利用红外光谱法分析洗衣粉的成分 总被引:1,自引:0,他引:1
采用热的无水乙醇作为溶剂将洗衣粉的无机和有机成分分开,利用红外(IR)光谱法进行分析。通过IR分析并经多晶粉末X射线衍射法(XRD)物相分析可以确定洗衣粉无机相主要成分为碳酸钠、硫酸钠以及4A沸石。IR分析表明有机相主要成分为十二烷基苯磺酸钠,核磁共振氢谱(~1H NMR)确认为支链十二烷基苯磺酸钠。 相似文献
18.
红外光谱法测定农药中吡虫啉含量 总被引:6,自引:2,他引:6
通常使用高效液相色谱法检测农药中有效成分吡虫啉的含量。文章采用红外光谱法直接测定农药中吡虫啉含量,样品使用KBr压片法。吡虫啉标准品和商品吡虫啉农药的红外光谱对照实验表明:吡虫啉在939.2 cm-1处的吸收峰不受农药中其他成分的干扰,可以选择此峰为定量分析波数;吡虫啉红外光谱在947~925.8 cm-1处的峰面积与其净含量满足线性方程:Area=1.3665×10-1+2.37×10-2×c,相关系数r=0.999 53。结论:利用红外光谱快速检测农药中有效成分吡虫啉含量的方法是可行的,可以替代常规的理化分析, 能够满足快速分析的需要。 相似文献
19.
用燃烧氧化 -非色散红外吸收法测定了杭州市辖区内的地表水、污水处理厂排水和不同行业工业废水中的总有机碳 (TOC)。结果表明 ,本法检出限为 0 .3mg/ L ,对于 TOC浓度在 6 .1— 12 0 mg/ L范围内水样的测定 ,相对标准偏差在 1.3%— 10 %之间。 相似文献
20.
傅里叶变换红外光谱在大气遥感监测中的应用 总被引:7,自引:2,他引:7
傅里叶变换红外光谱遥感技术是一门综合探测技术,它可以对气体组分分进行远距离,实时,多组分同时监测。本文介绍了遥感傅里叶变换红外谱光在遥测大气层中痕量气体,污染源排放的废气,灭火过程产生的有毒气体、气体空间分布等方面的应用现状。 相似文献