Obscuration detector
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United States of America Patent
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Nov 23, 2004
Grant Date -
Jul 10, 2003
app pub date -
Jan 8, 2002
filing date -
Jan 8, 2002
priority date (Note) -
Expired
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Abstract
An automatically testable obscuration detector incorporates one of an electrically controllable filter or a mechanically selected filter. Filtered outputs can be compared to expected outputs by control circuitry to automatically assess detector operation.
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