An Analysis Of Two Classes Of Grazing Incidence Mirrors For Use With Rowland Circle Spectrometers

James Green; Stuart Bowyer

doi:10.1117/12.968117

13 October 1986 An Analysis Of Two Classes Of Grazing Incidence Mirrors For Use With Rowland Circle Spectrometers

James Green, Stuart Bowyer

Proceedings Volume 0627, Instrumentation in Astronomy VI; (1986) https://doi.org/10.1117/12.968117
Event: 1986 Astronomy Conferences, 1986, Tucson, United States

Abstract

We present the results of a comparative analysis of Hettrick Bowyer Type II (HBII) and Wolter Schwarzschild Type II (WSII) optics for use with Rowland circle spectrometers. We find that the HBII can substitute, with few exceptions, for a WSII in any Rowland circle with little change in spectrometer performance or design. This is demonstrated by raytraces through both instruments. However, the HBII telescope offers several clear advantages over the WSII in these configurations. Because the HBII employs a virtual focus, it requires a much shorter instrument length than a WSII. For example, a 3-meter Rowland circle spectrometer, fed by an optimized, f/10, 1-meter diameter WSII has a total instrument length of 6 meters. If a HBII is used to feed the identical spectrometer, the entire instrument length can be as little as 3 meters. In addition, the improved imaging gained with the larger graze angles of the HBII design results in better resolution in slitless operation modes.

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James Green and Stuart Bowyer "An Analysis Of Two Classes Of Grazing Incidence Mirrors For Use With Rowland Circle Spectrometers", Proc. SPIE 0627, Instrumentation in Astronomy VI, (13 October 1986); https://doi.org/10.1117/12.968117

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KEYWORDS

Telescopes

Mirrors

Spectrometers

Grazing incidence

Optical instrument design

Astronomy

Sensors

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