Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-06-17
1994-10-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250226, H01J 4014
Patent
active
053549805
ABSTRACT:
A focal plane array employing a segmented multiplexer having differing unit cell capacitances and amplifiers in respective segments of the multiplexer. The segmented multiplexer accommodates and processes the maximum expected signal at differing illumination levels without saturation and provides for optimized noise levels in each of its segments. The focal plane array includes an array of detectors and an array of multiplexer cells respectively coupled thereto. The array of detectors comprises a plurality of groups of detector elements that each detect energy in a predetermined spectral region. The array of multiplexer cells comprise a plurality of groups of multiplexer cells that are respectively coupled to the plurality of groups of detector elements. Each multiplexer cell includes an integrating capacitor and an amplifier, and the integrating capacitor of each cell in a particular group has a predetermined capacitance whose charge integration capability corresponds to an expected maximum intensity level of radiation in the particular spectral region that is detected by the corresponding detector element in the detector array. The optimization of the characteristics of the integrating capacitor and amplifier provided for optimized detection of the radiation in that spectral region. By using more than one unit cell design, the response of each portion of the focal plane array is optimized to the range of expected intensities that will be incident on that portion of the focal plane array. In this manner, saturation is avoided in those portions of the focal plane that are expected to observe very high light intensities. In those portions of the focal plane that are expected to observe low light intensities, the cell amplifiers are designed to accommodate the lower intensity levels with decreased noise.
REFERENCES:
patent: 4242706 (1980-12-01), McCormack et al.
patent: 5155348 (1992-10-01), Ballingal et al.
Rappoport William
Silverglate Peter
Zalewski Edward
Denson-Low Wanda K.
Hughes Aircraft Company
Le Que T.
Nelms David C.
Sales Michael W.
LandOfFree
Segmented multiplexer for spectroscopy focal plane arrays having does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Segmented multiplexer for spectroscopy focal plane arrays having, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Segmented multiplexer for spectroscopy focal plane arrays having will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1660614