Two instruments for far-infrared astrophysics

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Two instruments for far-infrared astrophysics are described. The first is a broad-band photometer used on White Mountain for astronomical observations from 10 to 30 cm/sup -1/ (300 GHz to 1 THz; lambda, 1 mm to 330 ..mu..). The optical system of the telescope includes a light-weight, high-speed, chopping secondary. The L /sup 4/He-cooled photometer uses low-pass filters and a L/sup 3/He-cooled, composite bolometer. The system performance is evaluated, and the site is compared to other possible platforms. The second project is a balloon-borne spectroradiometer to measure the cosmic background radiation from 3 to 10 cm/sup -1/ (100 GHz to 300 ... continued below

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Pages: 133

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Bonomo, J.L. May 1, 1983.

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Description

Two instruments for far-infrared astrophysics are described. The first is a broad-band photometer used on White Mountain for astronomical observations from 10 to 30 cm/sup -1/ (300 GHz to 1 THz; lambda, 1 mm to 330 ..mu..). The optical system of the telescope includes a light-weight, high-speed, chopping secondary. The L /sup 4/He-cooled photometer uses low-pass filters and a L/sup 3/He-cooled, composite bolometer. The system performance is evaluated, and the site is compared to other possible platforms. The second project is a balloon-borne spectroradiometer to measure the cosmic background radiation from 3 to 10 cm/sup -1/ (100 GHz to 300 GHz; lambda, 3 mm to 1 mm). The apparatus has five band-pass filters with excellent rejection at higher frequencies, a low-noise chopper, and an internal calibrator. We describe the design and use of calibrators for such an experiment and develop a model of calibration procedures. The calibrations of several reported measurements are analyzed with this model, and flaws are found in one procedure. Finally, the system performance is used to estimate the accuracy this experiment can achieve.

Physical Description

Pages: 133

Notes

NTIS, PC A07/MF A01; 1.

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  • Other Information: Portions are illegible in microfiche products. Thesis

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  • Other: DE83015985
  • Report No.: LBL-14738
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/5911637 | External Link
  • Office of Scientific & Technical Information Report Number: 5911637
  • Archival Resource Key: ark:/67531/metadc1097495

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • May 1, 1983

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 25, 2018, 3:10 p.m.

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Bonomo, J.L. Two instruments for far-infrared astrophysics, report, May 1, 1983; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1097495/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.