Application of cooled ir detector in an optical system.
Cooled photoconductive devices as IR detectors
PHOTOCONDUCTIVE CELL↗
SEARCH · Engineering Papers
Results for “Ir”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Electron and ion emission from polycrystalline surfaces of Nb, Mo, Ta, W, Re, Os, and Ir in cesium vapor.
Full temperature range electron and ion emission from polycrystalline surfaces of Nb, Mo, Ta, W, Re, Os and Ir in cesium vapor
ELECTRON EMISSION↗
IR analysis of second breakdown modes in power transistors.
Power transistor reliability against second breakdown, locating breakdown by IR fast scan microscope and measuring breakdown voltage
Dostoomian, A. S.↗
Accuracy of IR horizon sensors as affected by atmospheric considerations
Low altitude atmospheric effects on IR beam horizon sensors in carbon dioxide band, noting corrections for spacecraft attitude measurement
Curfman, H. J., Jr.↗
Ga, Ge, In, Ir and Au in lunar, terrestrial and meteoritic basalts
Apollo 11 lunar, terrestrial and meteoritic basalts relationships, examining Ga, Ge, In, Ir and Au concentrations by neutron activation analyses
Baedecker, P. A.↗
Ni, Ga, Ge and Ir in the metal of iron- meteorites-with-silicate-inclusions
Neutron activation determined concentrations of Ni, Ga, Ge and Ir in iron meteorites with silicate inclusions
Wasson, J. T.↗
High altitude sites and IR astronomy
Investigating suitability and requirements of mountain sites for high altitude IR astronomical observations
Kuiper, G. P.↗
High altitude sites and IR astronomy, 2
High altitude sites for IR astronomy for Polar, Sub-Polar, and mid-latitudes
Kuiper, G. P.↗
High altitude sites and IR astronomy. II
IR astronomy high altitude sites, discussing optimal geographic locations, observation conditions criteria, transportation and survival measures
Kuiper, G. P.↗
Color and color-IR films for soil identification
Color and color IR films for soil identification, performing optical density measurements on film transparencies with densitometer
Gausman, H. W.↗
An adsorption pumped He 3 cooled IR detector
Adsorption cryopumped He 3 cooled IR detector without encumbrance of external diffusion or mechanical pump
Martin, T. Z.↗
Measurements of speed of response of high-speed visible and IR optical detectors
A technique for measuring speed of response of high speed visible and IR optical detectors to mode-locked Nd:YAG laser pulses is described. Results of measurements of response times of four detectors are presented. Three detectors that can be used as receivers in a 500-MHz optical communication system are tested.
Rowe, H. E.↗
The IR emission spectrum of N2 excited under auroral conditions.
Recently determined experimental and theoretical cross sections for electron impact excitation of six triplet states of N2 (A, B, W, C, E, D) have been utilized to predict the absolute IR volume emission rates from N2 under nighttime auroral conditions. Secondary electron fluxes appropriate to an IBC II normal aurora were used in the calculations. The cascade contributions coupling the various electronic states were included as well as the most important quenching processes. The results indicate that the B yields reversibly A and W yields reversibly B cascade processes, which are important in the population of the A, B, and W states, produce appreciable radiation in the 1- to 5-micron wavelength region.
Cartwright, D. C.↗
Geographical correlation of TV and IR images obtained from weather satellites
The requirements on the accuracy of geographical correlation of TV and IR cloud cover images are determined by the objective of the analysis of the weather information contained in these images. In the operational analysis case, the correlation accuracy need not be high. Errors of several tens of kilometers in determining the location of the cloud formation contours are considered acceptable in this case. Such correlation must be provided in real image reception time. Scientific studies require accurate correlation of the cloud formation contours. The errors in determining their position should be commensurate with the imaging system resolution. The geometric aspects of developing methods and equipment for geographical correlation of television and infrared images of cloud cover taken from Meteor satellites are discussed.
Ziman, Y. L.↗
Preignition reactions of AP-HTPB propellants studied by IR spectrometry
IR absorption spectrometry was used to follow the disappearance of NH and CH bonds during the pyrolysis of a polymer film containing 30 weight percent ammonium perchlorate (AP). The remaining 70 weight percent consisted of a mixture of 92.5 weight percent hydroxyl-terminated polybutadiene (HTPB) and 7.5 weight percent isophrone diisocyanate (IPDI). The results indicate that polymer decomposition is induced by products of AP decomposition, and that about 2.5 CH bonds disappear for each NH bond that disappears. The diffusion process occurring in the later stages of the reaction is analyzed in an attempt to account for the unexpectedly low activation energy.
Law, R. J.↗
Instrument measures many optical properties in visible and IR
Electro-optical system measures reflectance, reflectance ratio, transmission, absorption, refractive index, and absorption coefficient in both visible and infrared (IR) spectral regions. System effectively combining capabilities of ellisometer, reflectometer, and spectrophotometer is expected to find application in environmental and material composition testing fields.
Batten, C. E.↗
The far-infrared spectrum of S140 IR
The spectrum of S140 IR from 65 to 345 kaysers (155-29 microns) has been measured with 9.4-kayser resolution. The emission in this spectral range is consistent with a 9-arcsec-diameter blackbody radiating at a temperature of 70 K. Attempts at finding a self-consistent radiative-transfer model of the source suggest that the near- and far-infrared observations cannot result from a spherically symmetric nebula with a continuous density distribution and a central exciting source. A number of compact near-infrared sources may be embedded in the cloud.
Tokunaga, A. T.↗
Processing of multispectral thermal IR data for geologic applications
Multispectral thermal IR data were acquired with a 24-channel scanner flown in an aircraft over the E. Tintic Utah mining district. These digital image data required extensive computer processing in order to put the information into a format useful for a geologic photointerpreter. Simple enhancement procedures were not sufficient to reveal the total information content because the data were highly correlated in all channels. The data were shown to be dominated by temperature variations across the scene, while the much more subtle spectral variations between the different rock types were of interest. The image processing techniques employed to analyze these data are described.
Kahle, A. B.↗