Method and system for determining the rate of non uniformity...

Details Method and system for determining the rate of non uniformity... Method and system for determining the rate of non uniformity...

2006-01-12

2010-10-05

Porta, David P (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

C250S332000, C250S339020, C250S339040, C250S339090, C250S352000

Reexamination Certificate

active

07807969

ABSTRACT:
A focal plan array system of the bolometer type having means for determining the rate of non-uniformity which comprises: (a) an array of i×j pixel detectors of the bolometer type for sensing scenery radiation; (b) a case which accommodates said array of detectors, said case having a front window that provides exposure to the sensing element of all the i×j pixel detectors to radiation coming from the scenery; (c) at least a portion of column j+1 of blind detectors that are shielded from the scenery by a homogeneous reference surface; (d) reading circuitry for reading indication for the scenery radiation as sensed by each of the i×j detectors of the array, and for reading indication for the non uniformity as sensed by said detectors in column (j+1); (e) a register for recording the radiation values as read from all the detectors within column (j+1); and (f) a processing unit for finding the standard deviation σ of all the values in said register, and for comparing the same to a predetermined threshold Q, wherein a standard deviation above Q being an indication for a non uniformity above the allowed level.

REFERENCES:
patent: 5600143 (1997-02-01), Roberts et al.
patent: 6141048 (2000-10-01), Meyers
patent: 6410916 (2002-06-01), Jost et al.
patent: 6515285 (2003-02-01), Marshall et al.
patent: 6583416 (2003-06-01), Villani
patent: 2007/0215805 (2007-09-01), Boie et al.
patent: 2009/0008555 (2009-01-01), Dupont et al.
patent: 1117250 (2001-07-01), None

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