A low-resolution infrared-array spectrometer system for 7 micron-25 micron astronomical observations

Details A low-resolution infrared-array spectrometer system for 7 micron-25 micron astronomical observations A low-resolution infrared-array spectrometer system for 7 micron-25 micron astronomical observations

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pasp...88..971g&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 88, Dec. 1976-Jan. 1977, p. 971-982. NSF-supported research.

Astronomy and Astrophysics

Astronomy

10

Astronomical Observatories, Infrared Spectrometers, Multispectral Photography, Radiation Detectors, Arrays, Bolometers, Multiplexing, Multispectral Band Scanners

Scientific paper

The development of a low-resolution infrared array spectrometer which uses a cooled Czerny-Turner prism spectrometer to disperse 7-14-micron and 16-25-micron radiation onto a linear Ga-Ge bolometer array is reported. Advantages unique to the array-spectrometer concept are examined, including the instrument's abilities to observe many wavelengths simultaneously, to produce accurate spectral colors by minimizing seeing and guiding-associated signal fluctuations, and to enable low-background detector operation. The spectrometer design, alignment and calibration procedures, and the data-processing system are described. A unique feature of the data-processing system is the software cross-correlator which is used to synchronously demodulate the detector outputs. The cross-correlator generates independent phase lags for each detector to achieve maximum sensitivity. The results of several observing programs conducted to assess the capabilities of the array-spectrometer system are discussed. It is shown that, under typical observing conditions, each channel of the array spectrometer can compete in sensitivity with single-detector photometers which use interference filters to limit the observed spectral bandpass.

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