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Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements. Time Division Multiplexing:. Scan through spectrum Only one wavelength on at a time Spectral encoding in time. Light Source. Sample. Detector. Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements.

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slide1

Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements

Time Division Multiplexing:

  • Scan through spectrum
  • Only one wavelength on at a time
  • Spectral encoding in time

Light Source

Sample

Detector

slide2

Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements

Frequency Division Multiplexing:

  • All wavelengths on all the time
  • Spectral encoding in frequency
  • Wavelengths modulated with unique frequency
  • Demodulation with FFT or Lock-In Amplifier

Light Source

Sample

Detector

FFT

slide3

Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements

In this project:

  • Implementation of a general TDM and FDM system in LabVIEW
    • Modular coding of noise sources
    • Noise library
    • Detector library
  • Comparison of TDM and FDM performance
    • Same conditions (#wavelengths, wavelengths, avg. power, measurement time, linewidths, absorption levels, hardware)
    • Minimal detectable absorbance (MDA)
    • Differences in noise levels
    • Tracking of dynamic events
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