A computer-controlled submillimeter Fourier spectrometer

Author

Vij, Jagdish K. ; Corcoran, Patrick

Author_Institution

Dept. of Microelectron. & Electr. Eng., Trinity Coll., Dublin, Ireland

Volume

38

Issue

1

fYear

1989

fDate

2/1/1989 12:00:00 AM

Firstpage

85

Lastpage

91

Abstract

A system for submillimeter-wave Fourier transform spectroscopy (FTS) has been automated for the measurement of the power absorption coefficient of liquids in the wavenumber range 10-400 cm^-1. The interferometer is interfaced with a RM380Z Research Machines microcomputer. Software and hardware have been developed to automate the process of collecting and storing the data. Some points of relevance to the analysis of interferometric data are reviewed including the use of phase modulation, the resolution of spectra computed using the discrete Fourier transform, and the necessity of proper optical filtering in spectrometers which use Fourier transform techniques. Spectra measured using the FTS system described have been compared with results obtained using a tunable submillimeter laser and a good agreement was found between the two sets of data

Keywords

Fourier transform spectroscopy; computerised spectroscopy; fast Fourier transforms; light interferometers; microwave spectrometers; physical instrumentation control; Fourier transform spectroscopy; RM380Z Research Machines microcomputer; computer-controlled submillimeter Fourier spectrometer; discrete Fourier transform; interferometric data; liquids; optical filtering; phase modulation; power absorption coefficient; Absorption; Data analysis; Fourier transforms; Hardware; Liquids; Microcomputers; Optical filters; Optical interferometry; Power measurement; Spectroscopy;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.20003

Filename

20003