Flyable windowless calibration lamps for far-UV spectroscopy

Stephan Robert McCandliss; Eric B. Burgh; Paul D. Feldman

doi:10.1117/12.410546

18 December 2000 Flyable windowless calibration lamps for far-UV spectroscopy

Stephan Robert McCandliss, Eric B. Burgh, Paul D. Feldman

Proceedings Volume 4139, Instrumentation for UV/EUV Astronomy and Solar Missions; (2000) https://doi.org/10.1117/12.410546
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

We present the design of a pinhole lamp recently flown aboard two NASA/JHU sounding rocket missions as a wavelength standard for a far-UV spectrograph with a 900 - 1400 Angstrom bandpass. Lamp configuration, spectral output, gas supplies, payload accommodation and operation procedures are discussed. This lamp could easily be incorporated into future far-UV spectroscopic orbital missions and would benefit science return. We also discuss the use of Bayard-Alpert tubes (ionization gauges) as far-UV sources, which have the advantage of not requiring an external gas supply. At pressures between 10^-5 and 10^-7 Torr these tubes produce a strong emission line spectra, caused by electron impact with residual gas atoms in the vacuum. Below 10^-7 Torr the residual gas line intensities have weaken enough to reveal the long wavelength tail of a 150 eV bremsstrahlung spectrum produced by electron impact onto tungsten grid. The use of ionization gauges in flat field and end-to-end calibration experiments is described. We show how an ionization gauge and spectrograph can be used as a real- time residual gas analyzer sensitive to atomic and molecular gas species that emit within the bandpass. Such a device could be useful in material processing and contamination control environments.

Citation Download Citation

Stephan Robert McCandliss, Eric B. Burgh, and Paul D. Feldman "Flyable windowless calibration lamps for far-UV spectroscopy", Proc. SPIE 4139, Instrumentation for UV/EUV Astronomy and Solar Missions, (18 December 2000); https://doi.org/10.1117/12.410546

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