There are two main categories of spectrometry:辐射光谱和质谱.
Radiation spectrometry(UV-VI,IR,X射线,伽马射线)使得能够通过其与吸收,散射或发射的辐射相互作用来分析材料的结构。
弥撒spectrometryallows the molecular structure of a gas to be analyzed by ionization.
您应该选择的光谱仪类型取决于要检测的材料以及分析是否侵入(样本的破坏)。
The main selection criteria for your spectrometer should be:
- Sensitivity and detection limit
- Wavelength range
If you need to analyze the color of a sample, you will need a spectrometer covering the visible spectrum, between 360 and 740 nm.
- Resolution (the ability of the spectrometer to distinguish between two wavelengths close together)
If the sample spectrum has sharp peaks separated by a distance of at least 0.5 nm, you will need a spectrometer with a resolution of at least 0.5 nm.
除了您需要的波长和分辨率范围外,还有次要标准可以帮助您做出正确的选择:
- The overall size of the equipment, especially if it will need to be transportable
- 成本
- The analysis speed
- The signal-to-noise ratio
- 线性
- 动态范围
- 热稳定性
- 耐用性