Table of contents
Title Page
Picture of a Vibrational Spectroscopist on the Clearwater
River
Outline
Conventional FT-IR spectrometer
Voice coil performance
Voice coil performance
Desired performance
Precessing Disk Interferometer
Top View of Rapid Scan Interferometer Breadboard
Layout
Top View of Interferometer LN2 Cooled IR Detector
Top View of Laser and IR Sources w/ Suspended Beamsplitter
Stress: double-wedge
Two types of time-varying systems
Approaches to time-resolved IR spectroscopy
Scan time vs. modulation frequency
Dynamic range vs. scan time
Rapid-scan frequency spectrum
Retardation, velocity and duty cycle
Very-rapid-scan frequency spectrum
ADC resolution vs. frequency (1992)
ADC resolution vs. frequency (2000)
14 Bit 10 MHz ADC
Picture of Rapid Scan Interferometer Workstation
Picture of Disk Mirror and Drive Motor
Data acquisition
Bill Gate's Quote
Picture of Disk Motor Controller w/ Various Power
Supplies and Function Generator
Instrument Specifications
Raw ADC output
Raw Infrared Data
Mirror Position vs. Time
Mirror Velocity vs. Time
Filtered Mirror Velocity
Signal Processing
Orthogonality of Components
Synthesized Interferogram
Lomb Periodogram of IR Signal
Lomb Periodogram of IR Signal
Theoretical SNR Performance (mid-IR)
Theoretical SNR Performance (NIR)
Actual SNR Performance (1997)
Actual SNR Performance (2000)
Estimate of Detector Bandwidth
Interferogram Noise Level
SNR performance
Single 50 ms Scan; SNR ~500:1
100% Line
Spectrum, 1.5 milliseconds, 8 cm-1
Picture of Chopper Wheel w/ Various Affixed Polymer
Samples
Data of 85 Hz Chopper Wheel
5 ms Observation through Wheel
3 ms Scan Through Chopper
Conclusions
Acknowledgments
Contact Information |
Author: Chris Manning
Peter Griffiths
Bryan Bowie
E-mail: chris@appl-tech.com |