US 6,982,794 B1 | ||
Directional reflectometer | ||
Keith J. Davis, Issaquah, Wash. (US); and Diane C. Rawlings, Bellevue, Wash. (US) | ||
Assigned to The Boeing Company, Chicago, Ill. (US) | ||
Filed on Jun. 09, 1997, as Appl. No. 8/871,305. | ||
Application 08/871305 is a continuation in part of application No. 08/484576, filed on Jun. 07, 1995, granted, now 5,637,873, filed on Jun. 10, 1997. | ||
Int. Cl. G01N 21/47 (2006.01); G01J 5/02 (2006.01) |
U.S. Cl. 356—446 | 10 Claims |
1. A directional reflectometer, comprising:
(a) a source of radiation in a frequency range of interest for directing the radiation to a reflective test surface at incident
angles between normal and grazing, up to about 88° from the normal;
(b) an ellipsoidal reflector, having an upper and lower focus, for receiving reflected radiation from the reflective test
surface positioned at the lower focus;
(c) a detector positioned for receiving the reflected radiation from the ellipsoidal reflector that the ellipsoidal reflector
reflects toward the upper focus and for displaying a signal representative of the angle-space distribution of the reflected
radiation; and
(d) optionally, computing means electronically connected with the detector for analyzing the reflected radiation, the computing
means receiving the angle-space distribution signal from the detector.
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