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Browse Prior Art Database

Improved FT-IR Spectral Band Shapes

IP.com Disclosure Number: IPCOM000047444D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Bellar, RJ: AUTHOR [+2]

Abstract

A system for improving FT-IR (Fourier Transform-Infrared) spectral band shapes is shown in the drawing. This system differs from prior-art FT-IR systems by the inclusion of a switch 2 and an external reference 4. The external reference 4 can be a sinewave, squarewave or other well-known stabilized single frequency function. Timing information from, for example, an He-Ne reference laser can be used in place of the external reference with a suitable fast circuit. The switch can be designed to collect sample and reference sequentially or simultaneously. The advantage of sequential data collection is a decrease in noise in the final spectrum. The advantage of simultaneous data collection is that random velocity errors, which may affect spectral resolution, are recorded.

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Improved FT-IR Spectral Band Shapes

A system for improving FT-IR (Fourier Transform-Infrared) spectral band shapes is shown in the drawing. This system differs from prior-art FT-IR systems by the inclusion of a switch 2 and an external reference 4. The external reference 4 can be a sinewave, squarewave or other well-known stabilized single frequency function. Timing information from, for example, an He-Ne reference laser can be used in place of the external reference with a suitable fast circuit.

The switch can be designed to collect sample and reference sequentially or simultaneously. The advantage of sequential data collection is a decrease in noise in the final spectrum. The advantage of simultaneous data collection is that random velocity errors, which may affect spectral resolution, are recorded. Spectral improvement results from interpolation of the normal interferogram based on the frequency distortions apparent in the digitized external reference.

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