Optics: measuring and testing – By shade or color – With color transmitting filter
Reexamination Certificate
2007-06-21
2009-11-24
Lyons, Michael A (Department: 2877)
Optics: measuring and testing
By shade or color
With color transmitting filter
Reexamination Certificate
active
07623242
ABSTRACT:
A monitoring device is described for multiple chemical reactions in multiple test containers. Each container contains chemical reagents and at least one fluorescence dye indicator capable of changing its fluorescent characteristics due to the chemical reaction. A single cylindrical ultraviolet (UV) cold cathode fluorescent (CCFL) tube is utilized. Multiple test containers (e.g., 8) are placed along the tube of the CCFL. The UV light emerging from the CCFL interacts with the dye indicator in each of the containers to yield interactive light beams that can be detected by signal photo sensors. In order to compensate for the light variations occurring along the tube, a reference photo sensor is placed for each container location along the tube to directly detect the signal from the CCFL. By normalizing the signal generated by the signal photo sensor to the signal of the corresponding reference photo sensor, the value of the normalized signal is independent of any light source variations along the tube due to CCFL aging and repetitious power switching. Consequently, the normalized signals only correspond to chemical variations occurring in the test containers.
REFERENCES:
patent: 6577393 (2003-06-01), Potzschke et al.
patent: 2007/0121111 (2007-05-01), Blumenfeld et al.
Lyons Michael A
Nur Abdullahi
Young & Basile
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