P H Hindle and N K Reay 1967 J. Sci. Instrum. 44 360 doi:10.1088/0950-7671/44/5/308
P H Hindle and N K Reay
Show affiliationsAn automatic pressure stepping control and re-cycling system for use with a Fabry-Pérot interferometer is described. The latter uses narrow band interference filters to isolate the spectral region of interest (Hβ at λ = 4861 Å) and is scanned over wavelength ranges from 6 to 24 Å units centred on the above wavelength. A pre-selected programme of spectral elements can be sampled with an accuracy to ±1 torr and this corresponds to ±0.002 Å, when nitrogen is used as the control gas. The interferometer is designed to operate at resolutions from 0.25 to 1.0 Å at a finesse of 40 and with corresponding plate separations between 125 and 40 μm.
Issue 5 (May 1967)
Received 21 November 1966
P H Hindle and N K Reay 1967 J. Sci. Instrum. 44 360
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