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【傅里叶红外光谱仪结构顺序】傅里叶红外光谱仪:结构顺序及主要部分组成

承天示优官方账号 2023-04-23 资讯 442 views 0


傅里叶红外光谱仪的结构顺序

傅里叶红外光谱(FTIR)仪是一种用于分析物质的工具,它可以通过检测样品中吸收或反射的红外辐射来确定化学成分。对于大多数FTIR仪来说,其基本结构都包括以下几个步骤:

  • 光源:作为启动点,这是产生可见和/或近红外辐射的设备。
  • 采集器:此部件将发出的辐射捕获并引导到一个单元内以进行进一步处理。
  • 泵引振镜(PIV):PZT材料制成,该工具在输入信号(电流)下会振动,并使干涉计照明透过相移技术所需时间长度从而选择其中一条路径走向探测器。
  • Tiannia冷却器:This part of the FTIR system is primarily used to keep samples (and sometimes detectors) cool, since temperature can affect sample behavior and stability.
  • Mirrors:The mirrors in an FTIR system are designed to reflect and focus light, ensuring that the maximum amount of radiation enters the detector.
  • 探测器:这是一个装置,用于捕获样品产生的光辐射,并转换为可显示或数值化格式。

傅里叶红外光谱仪主要部分组成

FTIR仪器内部的每个结构都具有不同功能和属性。下面是一些跨多个FTIR系统常见的关键部件:

  • 光源:A source is needed to produce infrared radiation for analysis. There are several types of IR sources including Globar®, SiC and quartz tungsten halogen (QTH) lamps.
  • Mirrors:The mirrors in an FTIR system are designed to reflect and focus light, ensuring that the maximum amount of radiation enters the detector.
  • Tiannia冷却器:This part of the FTIR system is primarily used to keep samples (and sometimes detectors) cool, since temperature can affect sample behavior and stability.
  • An example diagram showing key parts of an FTIR spectrometer.Image credit: Bruker Inc.

  • Piezoelectric Crystal-based Sampling System (PIRS): The PIRS is a sampling system used in FTIR analysis to identify the molecular composition of a sample. It involves applying pressure to a piezoelectric crystal, causing it to vibrate and generate an electric current that is proportional to the force applied.
  • Interferometer:This part of the system measures phase differences in infrared radiation reflected from different mirrors, before converting the data into spectral information.
  • 探测器:A detector is necessary to capture and convert IR signals into useful data. Common detectors include photovoltaic (PV) and photoconductive (PC) devices such as mercury cadmium telluride (MCT).

在实验室环境中,FTIR系统通常需要经过校准和升级以确保最佳性能。例如,可以安装附件,如ATR(衰减全反射),以扩展该设备的应用范围,并增加其分辨率和灵敏度。

结论

傅里叶红外光谱仪是一种用于确定物质成分和化学特征的有用工具。每个组件都在不同程度上对FTIR系统的总体效果产生影响。因此,在选购或使用特定类型的FTI仪型号时,了解这些部分及其功能非常重要。

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