A Single-Double Pass Sisam Spectrometer for the Near Infrared

S. M. Till, P. A. Freedman, R. P. Tuckett, W. J. Jones

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A double-pass Sisam spectrometer of high resolution and sensitivity, previously described, has been modified for single-pass operation. For discrete line emission sources, this modification provides a gain of a factor of 6 in sensitivity at the expense of a loss of a factor of 2 in resolution in the near infra red region. As is demonstrated, the modified instrument is particularly suitable for the study of weak spectral sources. A coherent modulation system has also been incorporated which eliminates the periodic variations in signal strength arising from the non-coherent modulation technique previously employed.
Original languageEnglish
Pages (from-to)421-430
JournalRoyal Society of London. Proceedings A. Mathematical, Physical and Engineering Sciences
Issue number1674
Publication statusPublished - 25 Mar 1977


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