Cooled Grating Infrared Spectrometer For Astronomical Observations

J. R. Houck; G. E. Gull

doi:10.1117/12.934159

9 August 1983 Cooled Grating Infrared Spectrometer For Astronomical Observations

J. R. Houck, G. E. Gull

Proceedings Volume 0363, Advanced Remote Sensing; (1983) https://doi.org/10.1117/12.934159
Event: 26th Annual Technical Symposium, 1982, San Diego, United States

Abstract

A liquid helium-cooled infrared spectrometer for the 16 to 50μm range is described. The instrument has six detectors, three each of Si:Sb and Ge:Ga and two diffraction gratings mounted back-to-back. Cold preoptics are used to match the spectrometer to the telescope. In its nominal configuration the system resolution is 0.03μm from 16 to 30μm and 0.07μm from 28 to 50μm. A cooled filter wheel is used to change order sorting filters. The gratings are driven by a steel band and gear train operating at 40 K. The detector outputs are amplified by a TIA, employing a matched pair of JFET's operating at ~70° K inside the Dewar. The external warm electronics include a gain stage for the TIA and D.C.-coupled gating circuit to remove charged-particle (cosmic-ray secondary)-induced noise spikes. The gating circuit reduces the overall system noise by a factor of two when the spectrometer is used on NASA's Kuiper Airborne Observatory. Sample spectra are presented and the deglitcher performance is illustrated.

Citation Download Citation

J. R. Houck and G. E. Gull "Cooled Grating Infrared Spectrometer For Astronomical Observations", Proc. SPIE 0363, Advanced Remote Sensing, (9 August 1983); https://doi.org/10.1117/12.934159

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