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A control system for a fully automatic pressure scanned Fabry-Pérot interferometer

P H Hindle and N K Reay

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An 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.


PACS

07.60.Ly Interferometers

42.79.Ci Filters, zone plates, and polarizers

07.07.Tw Servo and control equipment; robots

Subjects

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 5 (May 1967)

Received 21 November 1966



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