Optics: measuring and testing – By shade or color – With color transmitting filter
Reexamination Certificate
2007-05-29
2010-11-30
Chowdhury, Tarifur (Department: 2886)
Optics: measuring and testing
By shade or color
With color transmitting filter
Reexamination Certificate
active
07843565
ABSTRACT:
A frequency modulated spectroscopy system, including a photo-detector, a band-pass filter to filter the output of the photo-detector, and a rectifier to demodulate. The band-pass filter has a relatively high Q factor. With the high Q factor band-pass filter and rectifier, a reference sinusoid is not required for demodulation, resulting in phase-insensitive spectroscopy. Other embodiments are described and claimed.
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Deev Andrei
Goddard William A.
Palm Steve L.
Tang Yongchun
Wu Sheng
California Institute of Technology
Chowdhury Tarifur
Nur Abdullahi
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