Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate
2005-06-14
2005-06-14
Porta, David (Department: 2878)
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
C250S338100, C250S336100
Reexamination Certificate
active
06906327
ABSTRACT:
Amount of coating cure or contamination is determined. An infrared beam is transmitted into a crystal. The beam reflects off an internal face at an angle higher than critical reflection angle to generate total reflection at the crystal face. The beam exits the crystal, is filtered at two wavelengths, and is detected to give values Io1and Io2of infrared energy reflected without coating. A coated sample contacts an outside face of the crystal. An evanescent wave penetrates the sample where the beam reflects from internal crystal face. The beam is partially absorbed by sample, exits the crystal, is filtered at two wavelengths, and is detected to give values Ic1and Ic2of infrared energy reflected with coating. Absorbance values A1and A2at two wavelengths are A1=−log10(Ic1/Io1) and A2=−log10(Ic2/Io2). Amount of cure or contamination is proportional to ratio or difference between A1and A2.
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LaRiviere Diane R.
Shelley Paul H.
Black Lowe & Graham PLLC
Porta David
Sung Christine
The Boeing Company
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