Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1996-05-13
1997-04-15
Hantis, K.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
G01M 1100
Patent
active
056215207
ABSTRACT:
A method of determining the optical quality of blurriness in a windscreen transparency having a protective liner made of a particular material. A modulation transfer function (MTF) is measured through a clear transparency having a protective liner made of a particular material, resulting in measurements which are stored as a first data series. An MTF is measured through a degraded sample transparency having a protective liner made of the same particular material, resulting in measurements stored as a second data series. The first and second data series are combined to create a standard range template, which is stored in a data base record. An MTF is measured through an aircraft windscreen (a specimen transparency) having a protective liner made of the same particular material resulting in test measurements which are stored as a test data series. The first and second data series are plotted as target modulation versus target line frequency resulting in standard range template line plots of an acceptable range of optical quality of blurriness. The test data series are plotted as target modulation versus target line frequency resulting in a specimen line plot. The specimen line plot and the standard range template line plots are displayed in a single graph on a visual display. Using the displayed image, an operator schedules a time for replacement of the specimen depending upon the location of the specimen line plot relative to the standard range template line plots. If the specimen line plot is not within the standard range template line plots, replacement is done immediately.
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Anderson Terry J.
Hantis K.
Hoch Jr. Karl J.
Northrop Grumman Corporation
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