体彩超级大乐透走势图

热搜关键词:拉曼光谱仪,光纤光谱仪,荧光光谱仪,地物光谱仪 | 
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国内外便携式拉曼光谱仪产品的差异

点击次数:1240次  发布时间:2018-06-12

拉曼光谱与物质分子的振动转动能级有关,是分子的指纹光谱,广泛应用于各种领域。大型拉曼光谱仪体积大、价格昂贵,仅适用于高校实验室及相关科研院所。21世纪以来,由于现场检测的需要,便携式拉曼光谱仪发展迅速。

 

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  激光器方面

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  光谱仪方面

  微型光谱仪是便携拉曼的“心脏”,光谱仪的性能直接影响拉曼的光谱分辨率,灵敏度和光谱检测范围。目前国内拉曼采用的光谱仪相较进口产品存在较大差距。例如,国内拉曼的分辨率一般在10cm-1左右,而国外拉曼的分辨率一般在5cm-1左右,其中美国B&WTek多种型号的光谱仪能达到3.5cm-1体彩超级大乐透走势图(ASTM标准方法测量)。另外,国外光谱仪在CCD封装,噪声控制等方面表现更佳。目前,在便携拉曼系统上,做到-20℃以下制冷的量产产品大部分都还是进口设备,例如EnWave,B&WTek,OceanOptics等,因为成本原因国产目前有制冷较少,仅有谱识科仪、奥普天成等采纳。

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  系统集成方面

  DANYIBUJIANDEHAOHUAIBUNENGWANQUANJUEDINGLAMANZHENGJIXINGNENG,XITONGDEJICHENGFANGMIANYEFAHUIZHEZHONGYAOZUOYONG,GUOCHANLAMANYOUYUQIBUWAN,YANFAZHUYAOJIZHONGZAIKEYANJIGOUJIGAOXIAO,ZAIXITONGDEJICHENGFANGMIANKENENGHUICUNZAICHAJU,ZHUYAOTIXIANWEI,GUOCHANLAMANYUJINKOULAMANCAIYONGXIANGSIDEPEIZHI,KENENGDEDAODELAMANDEZONGHEXINGNENGCHAJUMINGXIAN,ZHEIXUYAOZHANGQIDEJINGYANMOSUOHEJILEI。

  表面增强方面

  表面增强拉曼光谱技术将目标分析物质吸附在采用银、铜或金等材料制成的表面增强拉曼活性平面上,激发特定波长的光源引起表面吸收谱带或表面基质共振,使目标分析物质在作用区域内的拉曼光谱信号增强 104 ~ 106 倍。作为检测分析物质分子结构信息的直接手段,通过选择特征指纹谱图,该技术可有效降低检测误报率。表面增强拉曼光谱仪可在水或空气中正常工作,传感器可持续承受宽温度范围的背景。而且表面增强拉曼光谱技术不需要样品预处理,通过谱库检索可在 30 秒内快速响应。

体彩超级大乐透走势图  ZAICIJISHULINGYUZHONG,GUONEIDEZUODEXIANGDUIBIGUOWAIHENDUO,MUQIANDABUFENGUOWAICHANGJIAZAIBIAOMIANZENGQIANGSHIYONGDOUSHICAIYONGGUONEISHADAXIAOBANQIYESHAMENSHIPUSHINAMIKEJIYOUXIANGONGSIDEJISHU,GAIGONGSISHISHAMENDAXUETIANZHONGQUNYUANSHIQIANTOUZUZHISHISHIDEGUOJIAZHONGDAKEXUEYIQISHEBEIKAIFAZHUANXIANG—“DENGLIJIYUANZENGQIANGLAMANGUANGPUYIQIYANFAYUYINGYONG”CHANYEDANWEI。

  价格方面

体彩超级大乐透走势图  MUQIAN,SHIMIANSHANGDEGUOCHANLAMANMINGXIANBIJINKOULAMANBIANYIHENDUO,SHICHANGZHANYOULVYEZAIZHUBUKUODA。

  小结

体彩超级大乐透走势图  GUOCHANLAMANXIANGDUIYUJINKOULAMANDECHAJUZHUYAOTIXIANZAIGUANGPUFENBIANLV、LINGMINDU、XINZAOBI、ZHANGQIWENDINGXINGSHANG,DUIYUBUFENJIANDANYINGYONGSHIZUGOUDE,DANDUIYUYAOQIUGENGGAODEYINGYONG,BIRUFUZATIXIZHONGMUBIAOWUDEJIANCECUNZAIJUDATIAOZHAN。

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