NDLI: Rf spectrometers for heterodyne receivers

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Rf spectrometers for heterodyne receivers

Content Provider	NASA Technical Reports Server (NTRS)
Author	Buhl, D. Mumma, M. J.
Copyright Year	1980
Description	Several types of spectrometers developed for radio astronomy receivers which utilize RF filters, multiple oscillators and mixers, digital autocorrelators and acoustic/optic devices are considered. The RF spectrometer developed at GSFC to provide wide bandwidths (greater than 1 GHz) as well as high resolution (5MHz) is described. The 128 channel filter bank is divided into high and low resolution sections. The high resolution section is tunable by providing a second mixer ahead of the filter bank. This is necessary because infrared receivers which use gas lasers as local oscillators are only tunable to specific laser frequencies. To compensate for astronomical Doppler shifts and molecule frequency differences a second local oscillator and mixer is needed. A diagram of the RF section of the filter bank is shown. The RF spectrometer is shown to be the best means of achieving ultra-wide bandwidths for infrared heterodyne receivers. For high resolution with a large number of channels, the acousto/optical spectrometer is the principle instrument, particularly for balloon or space flight applications.
File Size	340080
Page Count	11
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19800021180
Archival Resource Key	ark:/13960/t4xh4dn2d
Language	English
Publisher Date	1980-08-01
Access Restriction	Open
Subject Keyword	Lasers And Masers High Resolution Molecular Spectra Optical Heterodyning Infrared Spectrometers Infrared Lasers Astronomical Spectroscopy Spectral Sensitivity Vibrational Spectra Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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