Understanding Intensity in Spectral Lines: A Brief Overview and Common Questions

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SUMMARY

This discussion focuses on the concept of intensity in spectral lines, specifically addressing units such as cm-2 atm-1, the distinction between line strength and absolute intensity, and the challenges of measuring absolute intensities. Participants also inquire about the units used in spectra recorded by Fourier Transform Spectrometers (FTS) and the feasibility of tuning lasers during engine cycles. The conversation highlights the complexities involved in quantifying spectral intensity and the practical implications for spectroscopy.

PREREQUISITES
  • Understanding of spectral line intensity and its measurement
  • Familiarity with Fourier Transform Spectrometers (FTS)
  • Knowledge of line strength versus absolute intensity
  • Basic principles of laser tuning and operation
NEXT STEPS
  • Research the significance of units in spectroscopy, particularly cm-2 atm-1
  • Explore the differences between line strength and absolute intensity in spectral analysis
  • Learn about the calibration methods for Fourier Transform Spectrometers (FTS)
  • Investigate the technology and methods for tuning lasers in real-time applications
USEFUL FOR

Researchers in spectroscopy, optical engineers, and anyone involved in the measurement and analysis of spectral lines and laser technology.

nordmoon
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Can someone help me to clear out a few questions about Intensity from spectral lines.

- I have seen in many reports the unit cm-2 atm-1? Where does this come from?
- What is the differences between line strength and the absolute intensity if the spectral line?
- If you measure light from for example a flame with a FTS (Fourier Transform Spectrometer) What unit does the recorded spectrum have? Is this not possible to determine and you simply use arbitrary units.
- Why is it difficult to measure absolute intensities?
 
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Anyone that an help me with the question above?

I have one more question. Is it possible to tune a laser during the cycle of an engine? How fast does it take to tune a laser?
 

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