NASA Scientific and Technical Aerospace Reports

potential for inducing catastrophic failures. It takes long times to modify standard actuators to meet specifications, and the
costs of such modifications are high. In the cases of actuators equipped with fail-safe shutdown systems, the stroking times
of these systems cannot be adjusted in the field.
Derived from text
Actuators; Fail-Safe Systems; Stopping; Valves; Hydraulic Control
20040071092 Pacific Island Technology, Inc., Honolulu, HI, USA, Advanced Testing Technologies, Inc., USA
Coastal Research Imaging Spectrometer
Lucey, Paul G.; Williams, Timothy; Horton, Keith A.; July 30, 2002; 1 pp.; In English
Report No.(s): NASA/NP-2003-01-0003-SSC; SSC-00158; No Copyright; Avail: CASI; A01, Hardcopy
The Coastal Research Imaging Spectrometer (CRIS) is an airborne remote-sensing system designed specifically for
research on the physical, chemical, and biological characteristics of coastal waters. The CRIS includes a visible-light
hyperspectral imaging subsystem for measuring the color of water, which contains information on the biota, sediment, and
nutrient contents of the water. The CRIS also includes an infrared imaging subsystem, which provides information on the
temperature of the water. The combination of measurements enables investigation of biological effects of both natural and
artificial flows of water from land into the ocean, including diffuse and point-source flows that may contain biological and/or
chemical pollutants. Temperature is an important element of such measurements because temperature contrasts can often be
used to distinguish among flows from different sources: for example, a sewage outflow could manifest itself in spectral images
as a local high-temperature anomaly.
Derived from text
Biological Effects; Coastal Water; Imaging Spectrometers; Infrared Imagery; Remote Sensing; Chemical Analysis; Physical
Properties; Bioassay
20040071102 NASA Stennis Space Center, Bay Saint Louis, MS, USA, Lockheed Martin Space Operations, Bay Saint
Louis, MS, USA
Thermocouple Extension-Wire-Connections and Low Temperatures
Figueroa, Fernando; Mitchell, Mark; Richardson, Gregory; October 2000; 5 pp.; In English
Contract(s)/Grant(s): NAS13-650
Report No.(s): SE-2000-10-00013-SSC; No Copyright; Avail: CASI; A01, Hardcopy
Experiments were carried out to determine the casue of erroneous readings from thermocouples of type K when
measuring temperatures of liquid hydrogen. It was believed to be linked to te temperature of the connector used to extend the
thermocouple wires to the voltage meter.
Author
Thermocouples; Electric Potential
20040071161 NASA Langley Research Center, Hampton, VA, USA
Validar: A Testbed for Advanced 2-Micron Doppler Lidar
Koch, Grady J.; Petros, Mulugeta; Barnes, Bruce W.; Beyon, Jeffrey Y.; Amzajerdian, Farzin; Yu, Jirong; Kavaya, Michael
J.; Singh, Upendra N.; [2004]; 12 pp.; In English; SPIE Defense and Security Symposium, 12-16 Apr. 2004, Orlando, FL,
USA
Contract(s)/Grant(s): 23-319-02-02; No Copyright; Avail: CASI; A03, Hardcopy
High-energy 2-microns lasers have been incorporated in a breadboard coherent Doppler lidar to test component
technologies and explore applications for remote sensing of the atmosphere. Design of the lidar is presented including aspects
in the laser transmitter, receiver, photodetector, and signal processing. Sample data is presented on wind profiling and CO2
concentration measurements.
Author
Breadboard Models; Doppler Radar; Lasers; Remote Sensing; Wind Measurement; Design Analysis; Carbon Dioxide
Concentration
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