Computer Science – Performance
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975josa...65..707d&link_type=abstract
Optical Society of America, Journal, vol. 65, June 1975, p. 707-711.
Computer Science
Performance
2
Cameras, Infrared Astronomy, Infrared Photography, Multiplexing, Performance Tests, Point Sources, Signal To Noise Ratios, Walsh Function
Scientific paper
A spatially multiplexed infrared camera is described. The camera records an image by measuring the coefficients of an orthogonal series expansion of the two-dimensional radiance distribution. By choice of appropriate functions, significant gains in the picture signal-to-noise ratio can be realized. We have constructed a camera utilizing this multiplexing principle to record images of astronomical objects at infrared wavelengths, where conventional scanning systems perform badly because of low signal levels. Test results verify that the camera exhibits the increase of efficiency expected of a multiplexing system, allowing exposure times two orders of magnitude shorter than necessary for comparable scanning systems.
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