Noise Analysis in TDM vs. FDM     Absorption Spectroscopy Measurements
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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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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

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


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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