Color television camera using tunable optical filters
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United States of America Patent
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Jun 18, 1996
Grant Date -
N/A
app pub date -
Apr 28, 1994
filing date -
Apr 28, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A color television camera includes a panchromatic light sensor such as a CCD imager. Light from a scene to be imaged is filtered by an electronically controlled light filter such as an etalon, which is scanned from color to color at the field rate, so that the image for each field is generated by a different color. The periodic spectral line or spectral band response of a single etalon is improved by a cascade of two etalons with different periodicity, which pass only a single spectral line or band. When an RGB color sequence is used, a complete color signal frame is generated in three fields. The imager may be operated at a field rate higher than the standard field rate, such as 90 Hz. for use with conventional 30 Hz. color frame rate, and a memory may be coupled to the output of the imager to store the three-field sequence of signals which occurs during each standard color frame, so that a complete color signal is available during each standard color frame. In the context of a spectrometer, the filter may be sequenced through a set of spectral responses which are characteristic of the light reflected from a particular material. A similar imager/filter combination may be used for spectrography as a 'tricorder'.
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