Table of contents
A Brief Introduction to Fourier Transform Infrared Spectrometry
A Picture of the Clearwater River
Discovery of Infrared Radiation
Discovery of Interference
Spectroscopy
Molecular Vibrations
Dipole Moments
Correlation between Chemical Structure and Infrared
Absorption
Michelson Interferometer
Interferometric Modulation
Rapid-scan Frequency Spectrum
Step-scan vs. Rapid-scan
Step-scan Frequency Spectrum
Fourier Transform
Vector Resolution
Phase modulation
System Block Diagram
The Vision Thing
The Reincarnation of Step-scan FT-IR Spectrometry
A Brief History of Interferometry
Key Enabling Technologies
Conventional Signal Processing
Digital Signal Processing
Time-domain SNR vs. Frequency-domain SNR line spectrum
Phase Modulation Measurement
FT of detector signal single-frequency phase modulation,
near zpd
FT of detector signal single-frequency pm, away
from zpd
FT of detector signal two-frequency phase modulation
Simultaneous 3-Frequency Phase-modulated Photoacoustic
Measurement
Photoacoustic Phase
Double-modulation Frequency Spectra
Double-modulation Measurement
FT of detector signal
Transmission Spectrum of Polypropylene
Dynamic stretching
Comparison of single and multi-frequency stretching
results
Effect of Multiplicative Noise
Largest Multiplicative Frequency Mixing Only Adjacent
Elements
Possible Instabilities
Refractive Index Variation
100% Line without Insulation
100% Line with Insulation
Block Diagram of DSP-Spectrometer
Instrument Basic Specifications
Picture of the Internal MIR 8000 Arrangement
DSP Specifications PC-32
DSP Specifications M-67
DSP Advantages
Modified Instrument Specifications
Transient Response
Position Stability
Step-scan 100% Line
Schematic of a DSP Based Spectroscopic Imaging System
Picture of the Oriel MIR 8000 Spectrometer Setup
Infrared Brightfield Images of a Bar Target
Infrared Spectra and Images of polymer "Shocktube"
Laminate
Cost of Computing
Conclusions
Picture of a Vibrational Spectroscopist on the Clearwater
River
Acknowledgements
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