SampleLight Source

Detector

Scan through spectrum

Only one wavelength on at a time

Spectral encoding in time

Time Division Multiplexing:

Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements

SampleLight Source

FFT

Detector

All wavelengths on all the time

Spectral encoding in frequency

Wavelengths modulated with unique frequency

Demodulation with FFT or Lock-In Amplifier

Frequency Division Multiplexing:

Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements

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

In this project:

Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements