Results 151 to 160 of about 606 (180)
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Submillimeter Heterodyne Astronomy from Mauna Kea
1981 International Conference on Submillimeter Waves and Their Applications, 1981This paper reports on the results of a collaboration between NASA Goddard Space Flight Center and MIT Lincoln Laboratory in which a laser heterodyne receiver was developed and used at the NASA infrared telescope on Mauna Kea. The NASA IRTF is located on the island of Hawaii at an elevation of 14000 ft (4200 m).
D. Buhl +6 more
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Cryogenic metal mesh bandpass filters for submillimeter astronomy
Applied Optics, 1984The design and performance of a tunable double-half-wave bandpass filter centered at 286 microns (Delta lambda/lambda = 0.16) and operating at cryogenic temperatures (for astronomy applications) are presented. The operating principle is explained, and the fabrication of the device, which comprises two identical mutually coupled Fabry-Perot filters with
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A synthesis arrary for lunar submillimeter astronomy
AIP Conference Proceedings, 1990This paper describes a system concept for a Synthsis Array for Lunar Submillimeter Astronomy (SALSA). It includes a brief discussion of the science objectives and the advantages of placing such an array on the moon, the system concept, and a top‐level discussion of the various subsystems, including the technology drivers associated with each.
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Radio and Submillimeter Astronomy: Radio Telescopes
2016Radio astronomy, the first astronomy after the optical one, investigates the radio emission of celestial sources. This chapter discusses the receiver systems based on the superheterodyne technique, investigating the different components: antennas, amplifiers, mixers, and detectors. The faintness of the radio signals demands radio telescope systems with
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Submillimeter Wave Astronomy Satellite and Star Formation
2003As a successful NASA explorer mission, SWAS makes first detections of the H2O emission at a ground-state transition (110 → 101). The general range of the fractional water abundance ([H2O] /[H2] 6×10-10 3 × 10-8), established through SWAS observations, are lower than those predicted by pure gas-phase chemistry by two orders of magnitude.
Di Li, Gary J. Melnick
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Radio and Submillimeter Astronomy: Receivers and Spectrometers
2016This chapter presents the different radio receiver configurations used to achieve the high stability demanded by the high gains required for the detection. The radio spectrometers are discussed. The chapter is closed by a discussion of the measurements of the CMB.
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The Submillimeter Wave Astronomy Satellite
1991 IEEE MTT-S International Microwave Symposium Digest, 1991P.F. Goldsmith +13 more
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Submillimeter and infrared astronomy
Technology for Space Astrophysics, 1982openaire +1 more source