Abstract
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 language | English |
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Pages (from-to) | 421-430 |
Journal | Royal Society of London. Proceedings A. Mathematical, Physical and Engineering Sciences |
Volume | 353 |
Issue number | 1674 |
DOIs | |
Publication status | Published - 25 Mar 1977 |