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5 results on '"J. L. Pipher"'

1. Spherical lamellar grating interferometer for airborne astronomical observations of far infrared objects

Author

J. L. Pipher, J. G. Duthie, and M. P. Savedoff

Subjects
Physics, Infrared astronomy, Infrared, business.industry, Materials Science (miscellaneous), Physics::Optics, Astronomy, Grating, Industrial and Manufacturing Engineering, Optics, Far infrared, Observatory, Cosmic infrared background, Thermal infrared spectroscopy, Astronomical interferometer, Astrophysics::Earth and Planetary Astrophysics, Business and International Management, business, Astrophysics::Galaxy Astrophysics
Abstract

A lamellar grating has been developed to be used for very far ir observations on the Gerard P. Kuiper Airborne Observatory. The design characteristics and performance during laboratory testing and initial observations of Jupiter at wavelengths between 50 microm and 500 microm are presented.

Published
2010

2. Black paints for far infrared cryogenic use

Author

J. L. Pipher and James R. Houck

Subjects
Materials science, business.industry, Infrared, Liquid helium, Abrasion (mechanical), Materials Science (miscellaneous), Cryogenics, Industrial and Manufacturing Engineering, law.invention, Optics, Integrating sphere, Far infrared, law, Black-body radiation, Diffuse reflection, Business and International Management, business
Abstract

A cryogenic paint which remains absorptive throughout the infrared has been developed. The paint exhibits excellent surface stability at liquid helium temperature and is resistant to abrasion and flaking. Measurements in a specially constructed cryogenic integrating sphere indicate that the paint is ~92-100% absorptive in the 70-130-micro range. Additional broadband measurements at 60 micro-130 micro, 18 micro-25micro, and 400 micro-1 mm indicate that the paint is ~95% absorptive.

Published
2010

3. Performance and spectral response of Pb1−xSnxTe(In) far-infrared photodetectors

Author

Dmitry Khokhlov, Dan M. Watson, S. N. Raines, I.I. Ivanchik, and J. L. Pipher

Subjects
Materials science, Physics and Astronomy (miscellaneous), business.industry, Orders of magnitude (temperature), Photoconductivity, Detector, Bolometer, Photodetector, law.invention, Wavelength, Responsivity, Optics, Far infrared, law, Optoelectronics, business
Abstract

We have compared directly the performance of a Pb1−xSnxTe(In) photodetector with that of two other state-of-the-art far-infrared detectors: a Si(Sb) blocked impurity band (BIB) detector and a Ge(Ga) photoconductor in an integrating cavity. The Pb1−xSnxTe(In) photodetector has current responsivity SI several orders of magnitude higher than the Si(Sb) BIB at wavelength λ=14.5 μm. Persistent photoresponse with SI∼103 A/W at 40 mV bias and 1 s integration time at the wavelengths λ=90 and 116 μm has also been observed in the Pb1−xSnxTe(In) photodetector. This is larger by a factor of ∼100 than the responsivity of the Ge(Ga) photoconductor in the same conditions.

Published
2000

4. The Infrared Array Camera (IRAC) for the Spitzer Space Telescope

Author

G. G. Fazio, J. L. Hora, L. E. Allen, M. L. N. Ashby, P. Barmby, L. K. Deutsch, J.‐S. Huang, S. Kleiner, M. Marengo, S. T. Megeath, G. J. Melnick, M. A. Pahre, B. M. Patten, J. Polizotti, H. A. Smith, R. S. Taylor, Z. Wang, S. P. Willner, W. F. Hoffmann, J. L. Pipher, W. J. Forrest, C. W. McMurty, C. R. McCreight, M. E. McKelvey, R. E. McMurray, D. G. Koch, S. H. Moseley, R. G. Arendt, J. E. Mentzell, C. T. Marx, P. Losch, P. Mayman, W. Eichhorn, D. Krebs, M. Jhabvala, D. Y. Gezari, D. J. Fixsen, J. Flores, K. Shakoorzadeh, R. Jungo, C. Hakun, L. Workman, G. Karpati, R. Kichak, R. Whitley, S. Mann, E. V. Tollestrup, P. Eisenhardt, D. Stern, V. Gorjian, B. Bhattacharya, S. Carey, B. O. Nelson, W. J. Glaccum, M. Lacy, P. J. Lowrance, S. Laine, W. T. Reach, J. A. Stauffer, J. A. Surace, G. Wilson, E. L. Wright, A. Hoffman, G. Domingo, and M. Cohen

Subjects
Physics, Large field of view, Infrared excess, Pixel, Infrared, business.industry, Detector, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Cardinal point, Optics, Spitzer Space Telescope, Space and Planetary Science, Survey instrument, business
Abstract

The Infrared Array Camera (IRAC) is one of three focal plane instruments in the Spitzer Space Telescope. IRAC is a four-channel camera that obtains simultaneous broad-band images at 3.6, 4.5, 5.8, and 8.0 microns. Two nearly adjacent 5.2x5.2 arcmin fields of view in the focal plane are viewed by the four channels in pairs (3.6 and 5.8 microns; 4.5 and 8 microns). All four detector arrays in the camera are 256x256 pixels in size, with the two shorter wavelength channels using InSb and the two longer wavelength channels using Si:As IBC detectors. IRAC is a powerful survey instrument because of its high sensitivity, large field of view, and four-color imaging. This paper summarizes the in-flight scientific, technical, and operational performance of IRAC., Comment: 7 pages, 3 figures. Accepted for publication in the ApJS. A higher resolution version is at http://cfa-www.harvard.edu/irac/publications

Published
2004
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5. Limb Darkening on the Earth's Night Side at Wavelengths of 1-3 μ and 3-7.5 μ

Author

D. P. McNutt, P. D. Feldman, Martin Harwit, K. Shivanandan, and J. L. Pipher

Subjects
Atmospheric Science, business.product_category, Materials science, integumentary system, Opacity, business.industry, fungi, Spectral bands, chemistry.chemical_compound, Wavelength, Optics, Atmosphere of Earth, Rocket, chemistry, Limb darkening, Carbon dioxide, business, Water vapor
Abstract

Limb darkening on earth night side observed by Aerobee rocket, with explanation based on atmospheric opacity in water vapor and carbon dioxide bands

Published
1969

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