Scientific and Technical Aerospace Reports Volume 38 July 28, 2000
Scientific and Technical Aerospace Reports Volume 38 July 28, 2000
Scientific and Technical Aerospace Reports Volume 38 July 28, 2000
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INSTRUMENTATION AND PHOTOGRAPHY<br />
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<strong>2000</strong>0061971 NASA Glenn Research Center, Clevel<strong>and</strong>, OH USA<br />
Detection Angle Calibration of Pressure-Sensitive Paints<br />
Bencic, Timothy J., NASA Glenn Research Center, USA; [<strong>2000</strong>]; 10p; In English; 46th; Instrumentation, 30 Apr. - 4 May <strong>2000</strong>,<br />
Bellevue, WA, USA; Sponsored by Instrument Society of America, USA<br />
Contract(s)/Grant(s): RTOP 519-20-53; No Copyright; Avail: CASI; A02, Hardcopy; A01, Microfiche<br />
Uses of the pressure-sensitive paint (PSP) techniques in areas other than external aerodynamics continue to exp<strong>and</strong>. The<br />
NASA Glenn Research Center has become a leader in the application of the global technique to non-conventional aeropropulsion<br />
applications including turbomachinery testing. The use of the global PSP technique in turbomachinery applications often requires<br />
detection of the luminescent paint in confined areas. With the limited viewing usually available, highly oblique illumination <strong>and</strong><br />
detection angles are common in the confined areas in these applications. This paper will describe the results of pressure, viewing<br />
<strong>and</strong> excitation angle dependence calibrations using three popular PSP formulations to get a better underst<strong>and</strong>ing of the errors associated<br />
with these non-traditional views.<br />
Author<br />
Detection; Angles (Geometry); Calibrating; Technology Assessment; Luminescence; Paints<br />
<strong>2000</strong>0062018 NASA Langley Research Center, Hampton, VA USA<br />
Three Averaging Techniques for Reduction of Antenna Temperature Variance Measured by a Dicke Mode, C-B<strong>and</strong> Radiometer<br />
Mackenzie, Anne I., NASA Langley Research Center, USA; Lawrence, Rol<strong>and</strong> W., NASA Langley Research Center, USA; May<br />
<strong>2000</strong>; 34p; In English<br />
Contract(s)/Grant(s): RTOP 258-70-21-06<br />
Report No.(s): NASA/TM-<strong>2000</strong>-210<strong>28</strong>3; L-17987; NAS 1.15:210<strong>28</strong>3; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche<br />
As new radiometer technologies provide the possibility of greatly improved spatial resolution, their performance must also<br />
be evaluated in terms of expected sensitivity <strong>and</strong> absolute accuracy. As aperture size increases, the sensitivity of a Dicke mode<br />
radiometer can be maintained or improved by application of any or all of three digital averaging techniques: antenna data averaging<br />
with a greater than 50% antenna duty cycle, reference data averaging, <strong>and</strong> gain averaging. An experimental, noise-injection,<br />
benchtop radiometer at C-b<strong>and</strong> showed a 68.5% reduction in DT after all three averaging methods had been applied simultaneously.<br />
For any one antenna integration time, the optimum 34.8% reduction in DT was realized by using an 83.3% antenna/reference<br />
duty cycle.<br />
Author<br />
Dicke Radiometers; Spatial Resolution; Digital Data; Microwave Imagery; Noise Temperature; Temperature Effects; Error Analysis;<br />
Antenna Components<br />
<strong>2000</strong>0062468 NASA Ames Research Center, Moffett Field, CA USA<br />
AIRES: An Airborne Infra-Red Echelle Spectrometer for SOFIA<br />
Dotson, Jessie J., Search for Extraterrestrial Intelligence Inst., USA; Erickson, Edwin F., NASA Ames Research Center, USA;<br />
Haas, Michael R., NASA Ames Research Center, USA; Colgan, Sean W. J., NASA Ames Research Center, USA; Simpson, Janet<br />
P., NASA Ames Research Center, USA; Telesco, Charles M., Florida Univ., USA; Pina, Robert K., Florida Univ., USA; Wolf,<br />
Juergen, Deutsche Forschungsanstalt fuer Luft- und Raumfahrt, Germany; Young, Erick T., Arizona Univ., USA; [1999]; 10p;<br />
In English; Thermal, <strong>28</strong>-30 Apr. 1999, Houston, TX, USA<br />
Contract(s)/Grant(s): NCC2-647; No Copyright; Avail: CASI; A02, Hardcopy; A01, Microfiche<br />
SOFIA will enable astronomical observations with unprecedented angular resolution at infrared wavelengths obscured from<br />
the ground. to help open this new chapter in the exploration of the infrared universe, we are building AIRES, an Airborne Infra-Red<br />
Echelle Spectrometer. AIRES will be operated as a first generation, general purpose facility instrument by USRA, NASA’s prime<br />
contractor for SOFIA. AIRES is a long slit spectrograph operating from 17 - 210 microns. In high resolution mode the spectral<br />
resolving power is approx. 10(exp 6) microns/A or approx. 10(exp 4) at 100 microns. Unfortunately, since the conference, a low
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