關於拉曼光譜儀

什麼是拉曼光譜?

拉曼光譜儀的應用

Biomedical
  • Early Cancer
  • Ultrastructure change of Biological molecule
  • Calculi components analysis
  • Others
Public Safety
  • NDT Drugs and Narcotics
  • Fast Detect Toxic Substance
  • Explosives & Flammable materials
  • Drink water
Pharmaceutical Engineer
  • Drugs scan and analysis
  • Crystallization in process monitor
  • Raw material & QC
Food Safety
  • Detect refined gutter oil
  • Detect pesticides residues
  • Food additives and contaminants
Environmental science
  • Waste water contamination
  • Petroleum analysis
  • Deposits analysis
Gemstones
  • NDT ID and Antique ID
  • Trace gemstones place-of-origin
  • Anti-counterfeiting

拉曼光譜儀的優點

Infrared Spectroscopy Raman Spectroscopy
Principle Molecule Absorption Spectrum Molecule Emission Spectrum,More Accurate
Mechanism Vibration associated dipole moment or charge distribution Electron cloud distribution induced polarizability change, induced dipole moment, return basic state to scatter
Detect Sample Contact measure,  prepare sample plate, can not measure through glass, Take out sample is a must Non-contact sample, detect through glasses, plastic bags, krafts and papers...
Detect Method Damage sample, take out sample, consume more sampels Non destructive detect, No contact sample
Pretreatment Sample Preatment No Sample pretreatment, sample preparation, easy to detect

拉曼光譜儀的標準

National Standard of Raman

ITEM ClassⅠ Class Ⅱ Class III Class IV
Resolution ≤ 1 cm-1 ≤ 4 cm-1 ≤ 8 cm-1 ≤ 15 cm-1
Accuracy ± 1 cm-1 ± 1 cm-1 ± 2 cm-1 ± 4 cm-1
Repeatability ≤ 0.1 cm-1 ≤ 0.5 cm-1 ≤ 1 cm-1 ≤ 2 cm-1
Shift Accuracy ± 1 cm-1 ± 1 cm-1 ± 2 cm-1 ± 4 cm-1
Shift Stability ≤ 0.5 cm-1 ≤ 0.5 cm-1 ≤ 1 cm-1 ≤ 2 cm-1
Intensity Stability ≤ 2% ≤ 2% ≤ 5% ≤ 5%
SNR ≥ 10:1 (monosillicon 3rd order peaks) ≥ 3:1 (monosillicon 3rd order peaks) ≥ 100:1 (monosillicon 2rd order peaks) ≥ 10:1 (monosillicon 2rd order peaks)

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