Engineering topics

Wang, S. C.

Publications and source records attributed to Wang, S. C..

4 records

NASA NTRS1984

Analysis methods for Thematic Mapper data of urban regions

Studies have indicated the difficulty in deriving a detailed land-use/land-cover classification for heterogeneous metropolitan areas with Landsat MSS and TM data. The major methodological issues of digital analysis which possibly have effected the results of classification are examined. In response to these methodological issues, a multichannel hierarchical clustering algorithm has been developed and tested for a more complete analysis of the data for urban areas.

Wang, S. C.↗

NASA NTRS1972

Enhanced Lamb dip for absolute laser frequency stabilization

Enhanced Lamb dip width is 5 MHz and total depth is 10 percent of peak power. Present configuration is useful as frequency standard in near infrared. Technique extends to other lasers, for which low pressure narrow linewidth gain tubes can be constructed.

Siegman, A. E.↗

NASA NTRS1970

Absorption coefficient, transition probability, and collision-broadening frequency of dimethylether at He-Xe laser 3.51-micron wavelength

Absorptivity, transition probability and collision broadening frequency of dimethylether at 3.51 micron He-Xe laser wavelength, noting pressure dependence, transition lifetime and saturation intensity

Siegman, A. E.↗

NASA NTRS1970

Observation of an enhanced Lamb dip with a pure Xe gain cell inside a 3.51-micron He-Xe laser

He-Xe laser with pure Xe-136 gain cell inside cavity, observing enhanced Lamb dip in power output vs frequency curve

Byer, R. L.↗