5.2.2归一化<Normalization> 另一个常用的光谱处理命令是归一化<Normalize>.对于如图所示光谱由于透过率低,基线低,吸收峰小,不利于光谱解析和给出报告.此时可以利用归一化进行处理. 100%T为基线将光谱最大吸收峰扩展/缩小至设定的吸光度值. 在<Normalize ordinate to>下方输入您所需要的纵坐标值,点击确认<OK>. ...
Two other common normalization methods in the literature, namely, the area normalization and the min–max normalization (1605/cm-urea normalization), are also tested for the same area calculation. The results of these tests are summarized in Table 3. The area of the 3000–2600/cm region is ...
Several data pretreatments such as multiplicative scatter correction (MSC), smoothing, derivation and normalization of the spectral data were employed to improve the performance of the method. The PLS analysis on the data expressed as R and log(1/R) after smoothing, differentiation and normal...
Wavelength (cm−1)Wave range (%)Smoothing (SavGol)Filtering methodsNormalizationSNRFactors Raw data400–4000 100 5 Baseline: WLS Filtering: 1st-2nd derivative - SVN 4 25 Adjusted data925–1650 40 2 Baseline: WLS Filtering: EMSC SVN 4 5 2.4. Data analysis After signal preprocessing the data...
(1) Min/Max Normalization―(最小/最大归一化):谱图的最小值变为0,Y轴的最大值扩展到2个吸收单位。对透射光谱归一化到0到1的范围。 (2) Vector Normalization―(矢量归一化):首先计算光谱的平均值,然后从谱图中减去平均值,因此谱图的中间下拉到0:计算此时所有Y值的平方和的平方根。原谱图除以此平方根值...
12 5.1.2 定制图谱格式Format Graph 13 5.1.3 垂直光标Vertical Cursor 15 5.1.4 添加文字Add Text 15 5.2 谱图处理 16 5.2.1 交互式基线校正Interactive Baseline Correction 17 5.2.2 归一化Normalization 17 5.2.3 差谱Difference 18 5.2.4 平滑Smooth 19 5.2.5 光谱计算器Arithmetic 19 6. 公式和宏 20...
and normalization to the peak at 3445 cm-1. Omnic 9 software was used as well for preliminary comparison to spectral library entries. Selection of the Region of Interest (ROI) and the PCA analysis of spectral data was performed with Peak Spectroscopy software, and the generated data was used...
(2)Vector Normalization—(矢量归一化):首先计算光谱的平均值,然后从谱图中减去 平均值,因此谱图的中间下拉到0:计算此时所有丫值的平方和的平方根。原谱图 除以此平方根值,经过这样处理的谱图,其矢量模方为1 (3)Offset Correction—平移谱图,使最小Y值移至吸光值为0 11气氛补偿Manipulate—Atomspheric Compens...
Normalization and derivation enhance the reliability of this region by reducing noise and spectral scattering. Notably, wavenumber 3653 cm⁻¹ achieved the highest AUC of 0.866, with 91 % sensitivity and 76 % specificity. Download: Download high-res image (144KB) Download: Download ...
(1640 cm−1) with a relative peak intensity ratio of 2.5 ± 0.1, as calculated after baseline correction for both water peaks and normalization with respect to the OH-bending band. The obtained relative peak intensity ratios of the water bands are plotted in Fig.3bfor different ...