Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Reexamination Certificate
2005-04-05
2005-04-05
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
C356S484000
Reexamination Certificate
active
06876443
ABSTRACT:
In a process for automatically determining the modulation transfer function (MTF) of a focal plane array (FPA) cameras, a test grid is used to generate a beat whose amplitude corresponds to that of the grid image to be measured, without the sampling MTF. (The image of the test grid has a spatial frequency in the detector plane that is detuned with respect to the Nyquist frequency of the detector array. The test grid covers a range of at least half a beat period, and then, regardless of the actual phase position, the modulation amplitude is determined therefrom. Comparative MTF measurements are thereby permitted without the influence of the sampling effect of an FPA, and particularly the MTF measurement in real time suitable for the application to moving images.
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Assel Michael
Barth Jochen
Polin Yvonne
Connolly Patrick
Crowell & Moring LLP
LFK-Lenkflugkoerpersysteme GmbH
Toatley , Jr. Gregory J.
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